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Pratchett, Chris. "New surface treatments for the diffusion bonding of aluminium alloys." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390998.
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Gentile, Marialuisa. "Influence of zinc on surface treatments of aluminium-zinc alloys." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/influence-of-zinc-on-surface-treatments-of-aluminiumzinc-alloys(5b467a34-ba91-422b-87e0-83ef8d700154).html.
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This research work studies the influence of zinc on surface treatments such as mechanical polishing, anodic alkaline etching, alkaline etching and electropolishing. Solid-solution binary alloys containing 0.6, 1.0 and 1.9at.%Zn were investigated using scanning and transmission electron microscopies and ion beam analysis. Initially, the near-surface composition of the surface pretreated aluminium alloys were determined using Rutherford backscattering spectroscopy (RBS), medium energy ion scattering (MEIS) and glow discharge optical spectroscopy (GDOES). Subsequently, the surface morphologies of the pretreated specimens were characterized by secondary electron microscopy (SEM) and atomic force microscopy (AFM). Further related work was undertaken on the effect of the employed surface treatments on the anodic behaviour of aluminium-zinc alloys. A final analysis was carried out on the influence of grain orientation on zinc enrichment and surface morphologies of aluminium-zinc alloys developed during alkaline etching.The results reveal that surface pretreatments of aluminium-zinc alloys lead to zinc enrichment at the alloy/film interface. The number of zinc atoms contained in the enriched layer depends upon the employed surface pretreatment and the alloy composition. Surface pretreatments influence the topography of Al-Zn alloys. In particular, for electropolishing, alkaline etching and anodic alkaline etching, the resultant surface morphologies were associated with the oxidation-dissolution-precipitation mechanisms occurring at the alloy/film interface and at the film/solution interface. Anodizing of Al-Zn alloys shows that the anodic films growth on Al-Zn alloys in rolled condition and after surface treatment becomes detached from the substrate independently of the surface treatment employed, although detachment of the anodic film occur earlier on surface pre-treated Al-Zn alloys that developed zinc enrichment. The final studies correlated the mechanisms of oxidation and dissolution with the grain orientation. The result revealed that the (111) grain dissolves faster than other grains, while the higher number of zinc enriched atoms were measured on the (001) grain.
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Critchlow, Gary W. "Pretreatments for metal-to-metal bonding." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/7525.
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Wickramatillake, Chandika Diran. "Effects of siloxane surface treatments on strength and durability of adhesively bonded aluminium joints." Thesis, University of Hertfordshire, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323650.
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SANTOS, WAGNER I. A. dos. "Carcterização da resistência a corrosão de ligas de aluminio após tratamentos alternativos a cromatização, com e sem revestimento orgânico." reponame:Repositório Institucional do IPEN, 2011. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9948.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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SILVA, LUCIANA V. da. "Estudos dos mecanismos envolvidos em processos de endurecimento superficial a laser de ligas a base de aluminio." reponame:Repositório Institucional do IPEN, 2011. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9634.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Mhaede, Saad Mansour Hamed. "Corrosion performance of high strength aluminum alloys-effects of mechanical surface treatments." Clausthal-Zellerfeld Papierflieger, 2008. http://d-nb.info/996419667/04.
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REIS, FERNANDO M. dos. "Investigacao do tratamento com moleculas auto-organizaveis para substituicao da cromatizacao da liga AA5052H32 no preparo da superficie previo a pintura." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11365.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Gharbi, Oumaïma. "In-situ investigation of elemental corrosion reactions during the surface treatment of Al-Cu and Al-Cu-Li alloys." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066563/document.
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Ce travail de thèse s’est porté sur l’étude des alliages d’aluminium, et en particulier les alliages AA2024-T3 et AA2050-T3. L’alliage AA2024-T3 à base d’Al-Cu-Mg est utilisé depuis des décennies dans le domaine de l’aérospatial pour sa légèreté et ses excellentes propriétés mécaniques, est progressivement remplacé par les alliages Al-Cu-Li tels que l’AA2050-T3. Néanmoins, il en résulte parallèlement une microstructure très hétérogène, rendant l’AA2024 très sensible à la corrosion. Plusieurs moyens de protections - appelés traitements de surface- ont donc été développés, dans le but de ralentir au maximum la dégradation de l’alliage. Le prétraitement, une étape préliminaire au traitement de surface a pour but de préparer la surface de l’alliage. Plusieurs études ont démontré que cette étape est indispensable et assure l’efficacité du traitement de surface. Afin d’observer l’effet du prétraitement, plusieurs techniques de caractérisations de surface sont utilisées. La microscopie électronique à balayage (MEB) et la spectroscopie à photoélectron X (XPS) sont parmi les plus citées. Toutes ces méthodes ont pour objectif de s’assurer de la dissolution des éléments d’alliages, et de mettre en évidence les effets d’enrichissement de cuivre. Jusqu'à présent, aucune méthode n’a permis d’obtenir une analyse complète et in situ de la réactivité de tous les éléments lors du prétraitement. L’objectif principal de ces travaux de thèse était de développer une nouvelle méthodologie, capable de prodiguer une mesure précise de la réactivité d’alliages complexes tels que les alliages d’aluminium durant une séquence de prétraitement et d’apporter des informations sur le AA2050-T3, pour lequel la littérature est beaucoup plus pauvre en données quant à la réactivité de l’élément d’alliage Li avec les solutions de prétraitementThis PhD thesis focused on the study of aluminum alloys, particularly the AA2024-T3 and AA2050-T3. The Al-Cu-Mg based alloy (AA2024-T3) are used for decades in the field of aerospace for its lightness and excellent mechanical properties are progressively replaced by and Al-Cu-Li (AA2050-T3) alloys. Nevertheless, they exhibit a highly heterogeneous microstructure, making them sensitive to corrosion. Several surface treatments formulations, such as coatings, have been developed, with the aim of slowing as much as possible the degradation of these alloys. The pretreatment, a preliminary step to surface treatment, is intended to prepare the surface of the alloy prior coating application. Several studies have shown that this step is essential and ensures the effectiveness of the surface treatment. In order to observe the effect of the pretreatment, several surface characterization techniques were used. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) are among the most cited. All these methods are intended to quantify the dissolution of the alloying elements. To date, none has been able to obtain a complete and in situ analysis of the elemental reactivity of a complex alloy during the pretreatment. The main objective of this thesis was to develop a new methodology capable of providing a precise measurement of the reactivity of complex alloys such as aluminum alloys during a pretreatment sequence and to provide information on AA2050 -T3, as very little is reported about the reactivity of Li during the surface treatment
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SZURKALO, MARGARIDA. "Investigacao do efeito de moleculas auto-organizaveis na resistencia a corrosao da liga de aluminio 1050." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9488.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Scarabotto, Mônica. "Estudo da corrosão nas ligas de alumínio 3105 e 5052." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/183156.
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A resistência à corrosão das ligas de alumínio está relacionada ao meio de exposição, composição química, presença de intermetálicos e microestrutura do metal, entre outras. Neste trabalho investigou-se a corrosão nas ligas de alumínio 3105 H16 e 5052 H34, comumente utilizadas na indústria de carrocerias de ônibus, em meio aquoso continham íons agressivos, tais como cloretos, sulfatos e hidroxilas. Avaliou-se comparativamente o comportamento destas ligas com os revestimentos de proteção de Nanocerâmico, Cromo VI, Cromo III e Sistema de Pintura em exposição atmosférica acelerada e imersão em diferentes meios agressivos. Estudos mais aprofundados restringiram-se às ligas sem tratamento, para as quais foram realizados ensaios de exposição acelerada em névoa salina neutra, névoa salina acética, câmara de umidade e exposição atmosférica natural. Microscopia eletrônica de varredura por emissão de campo foi empregada para caracterizar a superfície das ligas antes e após os ensaios de névoa salina neutra e acética. O comportamento eletroquímico das ligas sem tratamento foi determinado através do monitoramento do potencial de circuito aberto, curvas de polarização potenciodinâmica anódicas e espectroscopia de impedância eletroquímica. Os resultados mostraram que o tratamento de Cromo VI foi o que obteve melhor desempenho na proteção de ligas de alumínio, particularmente para a liga 5052. De um modo geral, a liga 5052 apresentou maior resistência à corrosão nos meios testados em presença ou não de tratamentos superficiais. Na exposição à névoa salina, a corrosão manifestou-se principalmente na forma de pites. Ficou comprovado que o efeito do íon Cl- é importante, porém o fator preponderante do comportamento à corrosão das ligas de alumínio está relacionado ao pH do meio de exposição, sendo este recomendado para avaliar revestimentos protetores. Além das condições do meio ao qual o metal será exposto, na seleção de tratamentos anticorrosivos é importante considerar as particularidades de cada liga, uma vez que suas características composicionais e microestruturais exercem relevante influência no desempenho à corrosão.The corrosion resistance of aluminum alloys is related to the exposure medium, chemical composition, presence of intermetallic particles and metallic microstructure, among others. This work investigated corrosion of 3105 H16 and 5052 H34 aluminum alloys commonly used in the bus body industry in aqueous media containing aggressive ions, such as chlorides, sulfates and hydroxyls. The behavior of these alloys with the protective coatings of Nanoceramic, Chromium VI, Chromium III and Paint System in accelerated atmospheric exposure and immersion in different aggressive media was evaluated comparatively. Further studies were restricted to untreated alloys for which accelerated exposure tests were performed on neutral salt spray, acetic salt spray, moisture chamber and natural atmospheric exposure. Field scanning electron microscopy was used to characterize the alloys surface before and after neutral and acetic salt spray tests. The electrochemical statement of the untreated alloys was determined by monitoring the open circuit potential, anodic potentiodynamic polarization curves and electrochemical impedance spectroscopy. Results have shown that the treatment with Chromium VI was the one that obtained better performance in the protection of the aluminum alloys, particularly for 5052 alloy. In general, 5052 aluminum alloy presented greater resistance to corrosion in all tested media, with or without surface treatments. Under salt spray exposure, the corrosion attack appeared mainly in the form of pitting. It has been proven that the effect of Cl- ion is important, but the predominant factor on the corrosion behavior of aluminum alloys is related to the pH of the exposure medium, which is recommended to evaluate protective coatings. Besides the conditions of the medium to which the metal will be exposed, in the selection of anticorrosive treatments it is important to consider the particularities of each alloy, since its compositional and microstructural characteristics exert a relevant influence on the corrosion performance.
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Bandi, Raghava. "Effect of Surface Treatment on the Performance of CARALL, Carbon Fiber Reinforced Aluminum Dissimilar Material Joints." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011869/.
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Fiber-metal laminates (FML) are the advanced materials that are developed to improve the high performance of lightweight structures that are rapidly becoming a superior substitute for metal structures. The reasons behind their emerging usage are the mechanical properties without a compromise in weight other than the traditional metals. The bond remains a concern. This thesis reviews the effect of pre-treatments, say heat, P2 etch and laser treatments on the substrate which modifies the surface composition/roughness to impact the bond strength. The constituents that make up the FMLs in our present study are the Aluminum 2024 alloy as the substrate and the carbon fiber prepregs are the fibers. These composite samples are manufactured in a compression molding process after each pre-treatment and are then subjected to different tests to investigate its properties in tension, compression, flexural and lap shear strength. The results indicate that heat treatment adversely affects properties of the metal and the joint while laser treatments provide the best bond and joint strength.
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Petr, Jiří. "Povrchové úpravy hliníkových slitin." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2013. http://www.nusl.cz/ntk/nusl-216995.
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The thesis is focused on the surface treatment used for the preparation of aluminium alloys for the adhesive bonding. The theoretical part can be divided into three chapters. The first of them deals with aluminium alloys, the second one speaks about the adhesive bonding. The surface treatment itself, especially the conversion coating issues, is discussed in the last chapter. The experimental part is focused on the optimalization of a two-step titanium and zirconium based conversion coating technology. In the first part, the aluminium alloy is analysed by the glow discharge optical emission spectroscopy. The second part of the experiment deals with the first step of the technology, acidic deoxidation. The objective was to examine the influence of the exposure time on the morphology of the alloy surface and the shear strength of adhesive joints. In the last part of the experiment, the conversion coatings are prepared and characterised by the scanning electron microscopy and energy dispersive spectroscopy.
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Szurkalo, Margarida. "Investigação do efeito de moléculas auto-organizáveis na resistência à corrosão da liga de Alumínio 1050." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-23092011-162659/.
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Tratamentos de superfície são técnicas amplamente utilizadas com a finalidade de aumentar a resistência à corrosão de materiais metálicos. No caso específico do alumínio e ligas de alumínio, o tratamento com cromo hexavalente é um dos processos mais utilizados. Isso, em razão da eficiência e da facilidade de aplicação desse processo. Entretanto, em virtude de restrições ambientais e do elevado custo de tratamento de resíduos gerados neste processo, métodos alternativos para sua substituição vêm sendo avaliados. Neste contexto, o presente estudo investigou o processo de formação e proteção à corrosão fornecida por filmes de moléculas autoorganizáveis de compostos à base de fosfonatos sobre a liga de alumínio 1050. Para definir as condições do tratamento foram utilizadas medidas de condutividade e de ângulo de contato, juntamente com ensaios eletroquímicos. Técnicas eletroquímicas, especificamente: medidas de variação do potencial a circuito aberto (PCA), espectroscopia de impedância eletroquímica (EIE) e polarização potenciodinâmica foram utilizadas para avaliar a proteção à corrosão. Os diagramas experimentais de impedância foram interpretados utilizando circuitos elétricos equivalentes que simulam modelos do filme de óxido que se forma na superfície da liga. Os resultados fornecidos com a liga tratada com moléculas auto-organizáveis foram comparados com resultados obtidos em iguais condições com amostras da liga sem qualquer tratamento ou cromatizada com Cr(VI) e mostraram que o tratamento com moléculas auto-organizáveis aumenta significativamente a resistência à corrosão da liga e apresenta, em determinadas condições, desempenho próximo ao fornecido pelo processo de cromatização.Surface treatments are widely used to increase the corrosion resistance of metallic materials. Specifically for aluminum and aluminum alloys, treatment with hexavalent chromium is one of the most used, due to its efficiency and ease of application. However, because of environmental restrictions and the high cost involved in the treatments of waste generated in this process, alternative methods for its replacement are necessary. In this context, this study investigated the effect of the surface treatment with self-assembling molecules (SAM) based on phosphonate compounds on the corrosion of the 1050 aluminum alloy. The conditions adopted for the SAM treatment were determined by conductivity and contact angle measurements, besides electrochemical experiments. Electrochemical techniques, specifically: measurement of the open circuit potential (OCP) variation with time, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves were used to evaluate the corrosion resistance of the 1050 aluminum alloy exposed to SAM treatment The experimental impedance diagrams were interpreted using equivalent electrical circuit models that simulate film that is formed on the alloy surface. The results of the samples treated with SAM were compared with those of samples either without any treatment or treated with chromatizing conversion coating with Cr(VI) and showed that the first treatment significantly increased the corrosion resistance of the aluminum alloy and approached that of chromatizing with Cr(VI) process.
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Šulc, František. "Vady a jejich příčiny při barvení eloxovaných povrchů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230148.
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This thesis deals with the anodic oxidation of aluminum and its alloys. The work consists of two parts. The first one is focused on more detail description of anodic oxidation process itself and theoretical description of the technological process anodic oxidation. The second part is more practically oriented. It compares two different lines for anodizing, and examines factors that affect the final appearance of the surface layer during anodizing welded joints.
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Pikner, Jan. "Povrchová předúprava konstrukčních hliníkových slitin pro lepené spoje." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-376795.
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This thesis deals with pre-treatment of surface of aluminium alloys. The theoretical part focuses on the properties of aluminium and its alloys, on methods of surface treatment and the possibilities of quality assessment of pre-treated surface. The experimental part deals with finding of a proper method of pre-treatment. The quality of surface pre-treatment is assessed by observation by SEM with EDS and by single lap shear tests of adhesive joints. According to evaluated results, the optimalised methods are qualitatively and financially compared with the commercial method.
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Gavelius, Marianne, and Karin Andersson. "Surface Treatment for Additive Manufactured Aluminum Alloys." Thesis, Linköpings universitet, Molekylär ytfysik och nanovetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-169027.
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Manufacturing of aircraft parts is often complex and time-consuming, which has led to an increased interest in new manufacturing technologies in the Swedish industry such as additive manufacturing (AM). Additive manufacturing techniques could be a solution to meet the aircrafts’ demand since it contributes to an efficient manufacturing and allows a just-in-time production of complex metal parts in their final shape. However, the use of AM aluminum for aircraft applications is in a development phase and no surface treatment process exists. Thereby, it is of high interest to further investigate surface treatments for AM alloys. Currently at Saab AB, conventional aluminum alloys are generally anodized in tartaric sulphuric acid (TSA) to improve the corrosion resistance and adhesion properties of the metal. On the behalf of Saab AB, there is also an interest in establishing powder coating as a surface treatment. This master thesis’ purpose is to investigate the anodizing and adhesion properties for the two additive manufacturing alloys - AlSi10Mg and ScalmalloyⓇ, and compare it with the conventionally produced Al alloy 2024-T3. The anodization and the powder coating is examined by using following characterization techniques: profilometry, light microscopy, scanning electron microscopy and contact angle measurements. The results from the experimental part indicated successful anodizations for all the alloys and good adhesion properties for powder coating. This research is a first step in contributing to a better understanding of the anodic coating and adhesion properties for the AM samples ScalmalloyⓇ and AlSi10Mg
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Sainis, Salil. "The influence of Al alloy microstructure on conversion coating formation." Licentiate thesis, Jönköping University, JTH, Material och tillverkning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-51565.
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The formation of conversion coatings based on Ce, trivalent Cr and Ti/Zr is triggered by the local pH increase at cathodic IM sites of the aluminium alloy microstructure. The pH gradient is created over the cathodic intermetallic (IM) sites of the microstructure and its intensity is influenced by their activity which depends on their chemical composition, their size, and spatial distribution. Furthermore, the pre-treatment applied also affects the surface reactivity. The role of each of the microstructural features on the increased pH gradient and the subsequent triggering of local conversion coating deposition remains to be understood. To address the knowledge gap, model cast Al-Si-Fe and Al-Si-Cu-Fe alloys have been designed. Cerium based conversion coating treatment with standard parameters is applied to investigate the microstructure’s influence. Furthermore, four different surface pre-treatments’ effect on the topographical and electrochemical properties have been investigated by localized techniques and have been correlated with deposition experiment observations to prove surface reactivity. In this study, it was found that the four surface pre-treatments – polishing, NaOH, NaOH-HNO3, NaOH-H2SO4 activate the surface of alloys containing Fe-rich IM and Cu-rich IM differently. The surface pre-treatment NaOH-HNO3 was found most detrimental to the surface reactivity as the pre-treatment resulted in passivation of the IM and a drastic reduction in its volta potential. The best pre-treatment for the alloy Al-Si-Fe was found to be one with NaOH etching. In the case of Al-Si-Cu-Fe alloy, pre-treatments where a pickling step (with either H2SO4 or HNO3) was applied followed a NaOH etching step, the surface of the IM was activated more than other pre-treatments due to selective Al dealloying and Cu-redeposition. The extent of Cu-redeposition was observed to be the most when surfaces were pickled with HNO3 solution and with the NaOH- HNO3 pre-treatment, fastest deposition kinetics were observed. In the cast Al-Si-Cu-Fe alloy, the localized deposits were preferentially observed to form on only strong cathodic Cu-rich IM. The size (surface area) of the Cu-rich IM correlated linearly with the lateral deposition area as well as z-direction spread. It was found that the pH gradient resulting from the oxygen reduction reaction near an IM is very local and does not affect pH gradients of a neighbouring Cu-rich IM. The size did not have a profound impact on the extent of deposition occurring on a Cu-rich IM, but it was found that big Cu-rich IM activated faster for deposition reaction than small Cu-rich IM. When the progression of deposition on both coarse and fine microstructure cast Al-Si-Cu-Fe was quantitatively monitored at increasing conversion coating times 0.5h, 1h and 2h, it was observed that big Cu-rich IM in the coarse alloy triggered deposition faster than small Cu-rich IM. Deposition mechanism on Fe-rich IM was found to be composition specific. In the cast of big Fe-rich β-Al5FeSi IM, localized deposition initiated at the border on the IM and is explained based on Si content in the composition of the IM, which has very high resistivity. In another Fe-rich IM, although of a much smaller size, which had lower Si content and was richer in Fe, a localized deposition was observed on the entire IM.Bildning av omvandlingsbeläggningar baserade på Ce, trivalent Cr och Ti/Zr initieras av lokalt förhöjd pH vid katodiska intermetalliska platser I aluminiumlegeringens mikrostruktur. Utbredningen av den starka pH-gradientens uppkomst över katodiska intermetalliska (IM) platser av mikrostrukturen påverkas av dess aktivitet som i sin tur beror på dess kemiska sammansättning, storlek, och rumslig fördelning. Ytans reaktivitet påverkas dessutom av dess förbehandling. Rollen av mikrostrukturens egenskaper på den förhöjda pH-gradienten och efterföljande initiering av lokal omvandlingsbeläggning återstår att förstå. För att komplettera detta kunskapsgap har Al-Si-Fe och Al-Si-Cu-Fe modellgjutlegeringar utformats. Cerium-baserade behandlingar för omvandlingsbeläggning med standardparametrar tillämpas för undersökning av mikrostrukturens påverkan. Effekten av fyra olika ytförbehandlingar på topografiska och elektrokemiska egenskaper har dessutom undersökts med lokaliserade metoder och har korrelerats med observationer vid depositionsexperient för att bevisa ytreaktivitet. I denna studie har det visats att de fyra ytförbehandlingarna – polering, NaOH, NaOH-HNO3, NaOH-H2SO4 – aktiverar ytan hos legeringar innehållande Fe-rika intermetaller och Cu-rika intermetaller på olika vis. Ytförbehandlingen med NaOH-HNO3 visades vara skadligast för ytans reaktivitet eftersom förbehandlingen resulterade i passivering av IM och en drastisk sänkning av dess volta-potential. Den bästa förbehandlingen för Al-Si-Fe-legeringen visades vara med NaOH-etsning. I Al-Si-Cu-Fe-legeringens fall, var förbehandling där ett betningssteg (antingen med H2SO4 eller HNO3) tillämpades följt av etsning med NaOH, aktiverades ytan av IM mer än med andra förbehandlingar på grund av selektiv korrosion av Al och Cu-återdeposition. Utbredningen av Cu-återdeposition observerades vara störst när ytor var betade med HNO3-lösning och depositionens kinetik var som hastigast vid förbehandling med NaOH-HNO3. I den gjutna Al-Si-Cu-Fe-legeringen observerades lokaliserade depositionerna att bildas endast på starkt katodiska Cu-rika IM. Storleken (ytarea) på de Cu-rika IM korrelerade linjärt med den laterala depositionsytan samt med spridning i z-riktning. Det visade sig att pH-gradienten som uppkom via syrereduktionsreaktionen nära IM är väldigt lokal och påverkar ej pH-gradienter vid närliggande Cu-rik IM. Storleken hade ingen anmärkningsvärd verkan på utbredningen av deposition på Cu-rik IM, men stora Cu-rika IM visade sig aktiveras snabbare för depositionsreaktion än små Cu-rika IM. När depositionens framfart över grov och fin mikrostruktur i gjuten Al-Si-Cu-Fe följdes kvantitativt vid ökande omvandlingsbeläggningstid 0,5h; 1h och 2h, så observerades att stora Cu-rika IM i den grova legeringen påbörjade depositionen snabbare än små Cu-rika IM. Depositionsmekanismen på Fe-rika IM visades vara specifik för sammansättning. I gjutgodset med stora Fe-rika β-Al5FeSi IM visades lokaliserad deposition initieras vid gränsen av IM vilket förklaras baserat på Si-halt i IM sammansättning, som har väldigt hög resistivitet. I en annan Fe-rik IM, dock av mycket mindre storlek, som hade lägre Si-halt och rikare med Fe, en lokaliserad deposition var observerad över hela IM.
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Wilson, G. R. "Surface studies of aluminium and aluminium alloys." Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377646.
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Tavitas-Medrano, Francisco Javier. "Artificial aging treatments of 319-type aluminium alloys." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103299.
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Aluminum-silicon-copper cast alloys of the 319-type have attained a commercially important status because of their widespread use. Artificial aging treatments are routinely applied to these alloys in order to obtain precipitation hardening and improve their mechanical properties. Standard treatments may not always yield the optimum achievable properties, thus Mg and Sr are commonly added to improve the response of the alloy to aging and to modify the eutectic Si morphology from acicular to fibrous, respectively. The present study was carried out to investigate aging behavior of four 319-type alloys in regard to such mechanical properties as their ultimate tensile strength, yield strength, microhardness, percent elongation and impact toughness. Non-conventional aging cycles were applied so as to evaluate the degree of the improvement in strength obtainable. These treatments, labeled in this study as T6- and T7-type multi-temperature and interrupted aging treatments, involve several heating stages at different temperatures, as opposed to the single stage at constant temperature specifications of the standard T6 or T7 heat treatment regimes. Scanning electron microscopy was used to examine the fracture surfaces of selected tensile-tested samples to compare the fracture behavior. Transmission electron microscopy was used to reveal and identify the tiny precipitates which appear in the microstructure as a result of the precipitation-hardening process due to artificial aging. It was found that the main strengthening phase is theta-Al2Cu in the form of needles; other phases were observed as minor constituents in this alloy, including the binary beta-Mg2Si, the ternary S-CuAlMg 2 and the quaternary Q-Al5Cu2Mg7Si 7. The results show that while Mg and Sr additions improve the properties of the alloy, the standard T6 treatment may not be the best available option to produce optimum properties. In fact, when the peak-aged (T6) condition is desired, the optimum treatment consists of a continuous artificial treatment at 170°C for 8 h; when the overaged (T7) condition is desired, a T7-type multi-temperature treatment consisting of underaging at 170°C for 1 h, then at 190°C for 1 h, and finally overaging at 240°C for 2 h is the best option.
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Bransden, Antony Stuart. "Laser surface alloying of aluminium alloys." Thesis, Coventry University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241106.
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Van, den Bos Christopher. "Electrochemical surface processing of aluminium alloys." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621140.
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Rezai-Tabrizi. "Surface treatments of titanium and its alloys." Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338082.
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Gustafsson, Sofia. "Corrosion properties of aluminium alloys and surface treated alloys in tap water." Thesis, Uppsala universitet, Institutionen för materialkemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-157527.
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The aim of this thesis is to obtain a basic knowledge of the factors that affect corrosion of aluminium in tap water for different kinds of applications like water pipes for tap water, solar systems, HVAC&R-applications (like fan coil units on chillers) and heat sinks for electronic or industrial applications. Open systems are used in some applications and closed systems in others. There is a clear difference in the corrosion behaviour of these two systems. The main reasons for this difference are that the content of oxygen differs between the two systems and also that inhibitors can be used in closed systems to hinder corrosion. In this thesis focus will be on corrosion in open systems. The corrosion properties in tap water for different alloys of aluminium and different surface treatments have been examined. The influences on corrosion of the oxygen content in water and the iron content in aluminium alloys have been investigated. The corrosion properties of an aluminium alloy in deionised water have also been examined.
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Liu, Shukun. "The development of environmentally-friendly treatments for the protection of aerospace aluminium alloys." Thesis, University of Manchester, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.548682.
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Pye, John Frederick. "Surface treatments of aluminium for the production of lithographic printing plates." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245271.
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Elkandari, Bader M. H. M. "Excimer laser surface melting treatment on 7075-T6 aluminium alloy for improved corrosion resistance." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/excimer-laser-surface-melting-treatment-on-7075t6-aluminium-alloy-for-improved-corrosion-resistance(c2da3b82-eeb5-4eae-a1dc-e4aefba18c62).html.
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High strength 7xxx aluminium alloys are used extensively in the aerospace industry because the alloys offer excellent mechanical properties. Unfortunately, the alloys can suffer localised corrosion due to the presence of large intermetallic particles at the alloy surface that are aligned in the rolling direction. Laser surface melting (LSM) techniques offer the potential to reduce and/or to eliminate the intermetallic phases from the surface of the alloy without affecting the alloy matrix.The present study concerns the application of LSM using an excimer laser to enhance the corrosion resistance of AA 7075-T6 aluminium alloy. The initial stage of the project was aimed at optimising the laser conditions for production of a uniform microstructure, with the increase in the corrosion resistance of the alloy being determined by potentiodynamic polarization measurements in sodium chloride solution. Low and high laser energy densities were used with a different number of pulses per unit area to treat the alloy surface, which were achieved by changing both the laser fluence and the pulse repetition frequency. A laser fluence of 3.3 J/cm2 with 80 pulses was subsequently selected as the optimum condition to treat the surface of the alloy. The composition and microstructure of the alloy before and after LSM treatment, and following corrosion tests, were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD).After the laser treatment, the surface and the cross-sections of the alloy showed a significant reduction in the number of large intermetallic particles and a relatively homogenous melted layer was generated that provided significant improvement in the resistance of the alloy against corrosion, as assessed by several corrosion test methods, including exfoliation corrosion (EXCO) tests. However, delamination of the melted layer was observed after extended testing in the EXCO solution which is possibly related to the formation of bands of fine magnesium and zinc-rich precipitates within the melted layer. Therefore, anodising in sulphuric acid was applied to the LSM alloy, in order to further increase the corrosion resistance and to protect the laser treated layer from delamination by generating a thin oxide film over the LSM layer. The results revealed that the anodic treatment increased the resistance of the alloy to exfoliation attack.
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Grilli, Rossana. "Conversion coatings for aluminium alloys : a surface investigation for corrosion mechanisms." Thesis, University of Surrey, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520579.
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Garcia-Vergara, Sandra Judith. "Effects of alloy enrichment in the surface properties of aluminium alloys." Thesis, University of Manchester, 2004. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507256.
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Syahril. "Effect of ternary additions and thermomechanical treatments on the properties of Fe-11wt% Al alloys." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325578.
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Carroll, Lisa M. "Rapid steady state solidification of Al alloys." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298796.
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Rider, Andrew Chemistry Faculty of Science UNSW. "Surface Properties Influencing the Fracture Toughness of Aluminium-Epoxy Joints." Awarded by:University of New South Wales. School of Chemistry, 1998. http://handle.unsw.edu.au/1959.4/17804.
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This thesis systematically investigates the properties of the aluminium adherend which influence the fracture toughness of aluminium-epoxy adhesive joints in humid environments. The fracture energy of the adhesive joint exposed to a humid environment in comparison with the fracture energy in a dry environment provides a measure of the joint durability. A 500C and 95% relative humidity environment is used to simulate aging of an adhesive joint over several years under normal service conditions. Initially, surface roughness is found to have a significant influence on the fracture toughness of the adhesive joint in humid conditions. A direct correlation between the bond durability and the angle of deliberately machined micro-roughness in the aluminium surface is determined. Consequently a model is developed which initially has the capacity to describe the bond durability performance. The preparation of aluminium surfaces involves the use of a novel ultramilling tool to produce well defined and controlled surface topography. This work represents the first time surface angles of features in the 1????m to 10????m range have been systematically varied and a direct relationship with bond durability has been determined. The use of surface analytical tools aids in elucidating mechanisms involved in the failure of the adhesive joint and contributes to the development of the stress based diffusion model. Examination of the aluminium oxide hydration level reveals this property has a negligible effect on the fracture toughness of the aluminium-epoxy joints exposed to humid environments. This information confirms the dominant role of the physical properties of the aluminium surface in determining the adhesive joint durability. This is the first occasion that planer oxide films grown in an RF plasma have had their hydration state adjusted in a controlled manner and their properties subsequently assessed in terms of bond durability properties. Further alteration of the aluminium surface chemistry is achieved through the application of an organo-silane coupling agent and a series of novel organo-phosphonate compounds. This work further develops the stress based diffusion model developed in conjunction with the micro-machining studies. The components of surface roughness and the ability of interfacial bonds to co-operatively share load are essential for the maintenance of fracture toughness of adhesive joints exposed to humid conditions. The ability of the silane coupling agent to share load through a chemically cross-linked film is a significant property which provides the superior fracture toughness in comparison with the phosphonate treated joints. Although the organo-phosphonate treated aluminium provides hydrolytically more stable bonds than the silane coupling agent, the film is not cross-linked via primary chemical bonds and the reduced load sharing capacity of interfacial bonds increases the bond degradation rate. The stress based diffusion model evolving from the initial work in the thesis can be used to predict the performance of more complex systems based on a thorough characterisation of the aluminium surface chemistry and topography. The stress based diffusion model essentially describes the concept of the production of micro-cavities at the epoxy-aluminium interface under mode 1 load, as a result of the distribution of strong and weak adhesive bonds. Alternatively, micro-cavities may result from an inhomogeneous stress distribution. In areas where the adhesive bonds are weak, or the local stresses are high, the interfacial load produces larger micro-cavities which provide a path of low resistance for water to diffuse along the bond-line. The water then degrades the adhesive bond either through the displacement of interfacial epoxy bonds or the hydration of the oxide to form a weak barrier layer through which fracture can occur. Alternatively, the water can hydrolyse the adhesive in the interfacial region, leading to cohesive failure of the epoxy resin. The bond durability performance of a series of complex hydrated oxide films used to pre-treat the aluminium adherend provides support for the stress based diffusion model. Whilst surface area is an important property of the aluminium adherend in producing durable bonding, the best durability achievable, between an epoxy adhesive and aluminium substrate, requires a component of surface roughness which enhances the load sharing capability in the interfacial bonding region. This component of durability performance is predicted by the model. In more specific terms, a boiling water treatment of the aluminium adherend indicates a direct correlation between bond durability, surface area and topography. The characterisation of film properties indicates that the film chemistry does not change as a function of treatment conditions, however, the film topography and surface area does. The overall bond durability performance is linked to both of these properties. The detailed examination of the hydrated oxide film, produced by the boiling water treatment of aluminium, is the first time the bond durability performance has been related to the film topography. It is also the first occasion that the mechanism of film growth has been examined over such a large treatment time. The combination of surface analysis and bond durability measurements is invaluable in confirming the properties, predicted by the stress based diffusion model, which are responsible in forming fracture resistant adhesive bonds in humid conditions. The bond durability of high surface area and low surface area hydrated oxide films indicates that surface area is an important property. However, this study confirms that the absence of the preferred surface topography limits the ultimate bond durability performance attainable. The fracture toughness measurements performed on aluminium adherends pre-treated with a low surface area film also supports the mechanism of load sharing of interfacial adhesive bonds and its contribution to the overall bond durability. The role performed by the individual molecules and particles in an oxide film is similar to the load sharing performed by the silane coupling agent molecules. Further support for the stress based diffusion model is provided by films produced on aluminium immersed in nickel salt solutions. The topography of these film alters as a function of treatment time and this is directly related to fracture toughness in humid environments. This work provides the first instance where such films have been characterised in detail and their properties related to bond durability performance. The study is also the first time that the growth mechanism of the film produced on the aluminium substrate has been examined in detail. The film growth mechanism supports the film growth model proposed for the hydrated oxide film produced by the boiling water treatment. The major findings presented in this thesis are summarised as the direct correlation between surface profile angle, the importance of co-operative load sharing of interfacial adhesive bonds and the relative insignificance of surface oxide hydration in the formation of durable aluminium-epoxy adhesion. This information is used to develop a stress based diffusion model which has the capacity to describe the fracture toughness of a range of aluminium-epoxy adhesive joint systems in humid environments. The stress based diffusion model is also capable of predicting the relative performance of the bond systems examined in the final chapters of the thesis, where complex interfacial oxide films are involved in the formation of adhesive bonds.
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Roeth, Frederic. "Influence of near-surface structure on performance of 6000 series aluminium alloys." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497887.
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SIQUEIRA, GONÇALO. "Caracterização microestrutural, mecânica e tratamento térmico da liga AA-6082 obtida pelo processo de conformação por spray." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10151.
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IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
35
Moulinier, Flavie. "Effects of a surface treatment on the corrosion and fatigue behaviour of a high strength aluminium alloy." Thesis, University of Birmingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404131.
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COUTO, ANTONIO A. "Influencia do teor de cromo e de tratamentos termicos na microestrutura e no comportamento mecanico de ligas intermetalicas ordenadas a base de Fesub3 Al." reponame:Repositório Institucional do IPEN, 1998. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10701.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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González, Martínez Rodolfo [Verfasser]. "The influence of heat treatments on the damping behaviour of magnesium-aluminium-zinc alloys / Rodolfo González Martínez." Clausthal-Zellerfeld : Universitätsbibliothek Clausthal, 2012. http://d-nb.info/1021754676/34.
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McNaughtan, D. "Investigation into the sub-surface corrosion of high strength 7XXX series aluminium alloys." Thesis, Cranfield University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391578.
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Mertens, Jeremy. "Atmospheric plasma treatment of aluminum alloy surfaces: Oxide growth and oxygen rich organic coating deposition." Doctoral thesis, Universite Libre de Bruxelles, 2019. https://dipot.ulb.ac.be/dspace/bitstream/2013/287803/3/these.pdf.
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L’objectif de cette thèse consiste en une étude fondamentale de différentes approches pour la modification de surfaces d’alliages d’aluminium. Elle s’inscrit dans le cadre du projet FLYCOAT, subventionné par la région Wallonne. Ce dernier avait pour objectif le développement d’alternatives au couplage classique d’un procédé d’anodisation utilisant des bains de Cr (VI) aux résines époxy pour la protection des alliages d’aluminium contre la corrosion. Dans un premier temps, la synthèse par plasma atmosphérique dans un réacteur de type décharge à barrière diélectrique (DBD) de films riches en groupements carboxyliques à partir de 8 précurseurs organiques est étudiée. Une attention particulière est portée à la compréhension fondamentale des mécanismes de polymérisation de ces précurseurs. L’influence significative de minimes variations de la structure chimique du précurseur est étudiée. Concrètement, nous démontrons l’impact de la présence et de la position de doubles liaisons ou encore le ratio C/O dans le monomère injecté sur le mécanisme de synthèse des couches déposées. Pour ce faire, une méthodologie combinant des analyses de la phase plasma et des films déposés est proposée. Les propriétés électriques de la DBD d’argon sont évaluées par oscilloscope avant et durant l’injection des différents précurseurs. La quantité d’énergie transférée de la décharge vers le précurseur est évaluée par spectroscopie d’émission optique et corrélée à sa structure. Une fragmentation réduite est mise en évidence par spectrométrie de masse pour les monomères contenant une double liaison. Ces analyses de la phase plasma sont alors corrélées avec les propriétés physiques et chimiques des films synthétisés. Les compositions chimiques de surface et de la matrice des couches minces sont étudiées par spectroscopie à photoélectrons X (XPS) et infrarouge. Le rôle essentiel de la présence et de la position de la double liaison dans la molécule injectée est démontré. Les vitesses de dépôt et la rugosité des films déposés par plasma atmosphérique avec l’injection des 8 précurseurs sont évaluées par profilométrie à stylet. Dans la seconde partie, le couplage de deux méthodes de plasma atmosphérique est proposé pour la synthèse de couches d’alumine aux propriétés adaptables. Le premier traitement consiste en un nombre varié de passages d’une torche plasma opérant dans un régime d’arc. L’effet du nombre de passages sur les propriétés physiques et chimiques du substrat est étudié par XPS, angle de contact, microscopie électronique à balayage et mesures de diffraction à rayons X. Une corrélation est suggérée entre le nombre de passages de la torche et les propriétés électrochimiques du substrat. L’influence de ce premier traitement sur les propriétés de la couche d’oxyde d’aluminium synthétisée par oxydation par plasma électrolytique est mise en évidence. Dans un troisième temps, le plasma pouvant être considéré comme un réservoir d’énergie, une étude de faisabilité est réalisée afin d’évaluer sa potentielle utilisation pour la réticulation d’une résine de type benzoxazine. L’efficacité du traitement par DBD atmosphérique d’argon ou hélium est comparée et discutée.Doctorat en Sciences
info:eu-repo/semantics/nonPublished
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Sharma, Anurag. "Effects of Advanced Surface Treatments on Microstructure, Residual Stress and Corrosion-Fatigue Behavior of Aluminum Alloy 7075-T6." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin162765884039947.
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Aravamudhan, Boopa Nandhini. "Study of the Effect of Laser Shock Peening on Corrosion Behavior of Aluminum Alloy 7075." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535374351540327.
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JESUS, FILHO EDSON S. de. "Obtencao e avaliacao do comportamento a fadiga de compositos de matriz de aluminio submetidos a diferentes tratamentos superficiais mecanicos." reponame:Repositório Institucional do IPEN, 2000. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9273.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
43
Erkers, Louise. "Chemical Interactions between tool and Aluminium alloys in metal cutting." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291358.
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Aluminium applications in automotive will increase by 25 % over the next decade, mainly driven by the electrification and the reduction of fuel consumption. This diploma work aims to increase the understanding of the chemical interactions between aluminium alloys and typical tool systems in metal cutting. First the temperature at the tool-chip interface was estimated by FEM simulations, using the software AdvantEdge. Thereafter the chemical interaction of the tool-chip interface was calculated at the simulated temperature using the Thermo-Calc software. The thermodynamic data and descriptions of the multicomponent systems used where found in the literature, assessed by other authors, but critically reviewed for the use in this work. The results of the FEM simulations indicate that the temperature for machining aluminium with PCD and cemented carbide is between 60-80 % of the melting temperature of Al7wt %Si alloy. The calculations of the chemical interaction in turn results in that several hard precipitates can stick to or transform on the surface of the workpiece or tool-chip interface, for example SiC, Al4C3 and evidently diamond from the tool. This work concluded that more predictive modelling is needed to refine the results and the results from this work needs to be confirmed with experiments. The results show that the modelling can predict the reaction phases at the tool-chip interface, this can be used as input for the tool wear mechanisms during development of tooling solutions.Aluminium användningen inom fordonsindustrin förväntas öka med 25 % under det närmsta decenniet, främst på grund av elektrifiering men också för att för att minska bränsleförbrukning. Målet med detta examensarbete är till att öka förståelsen för de kemiska interaktionerna mellan aluminiumlegeringar och typiska verktygssystem vid metallskärning, framförallt vid bearbetning av aluminiumlegeringar innehållande kisel med ett TiN-belagt PCD-verktyg och icke-belagda verktyg. Detta gjordes genom prediktiva FEM-simuleringar av temperatur, med hjälp av mjukvaran AdvantEdge. Parallellt med detta skapades databaser för simulering av den kemiska interaktionen mellan skär och bearbetningsmaterial i programvaran Thermo-Calc. De termodynamiska data och beskrivningarna av de termodynamiska system som används var bedömda av andra författare men kritiskt granskade för användning i detta arbete. Resultaten av FEM-simuleringarna gav den beräknade temperaturen för bearbetning av aluminium med PCD ligger någonstans mellan 60-80 % av smälttemperaturen för Al7wt % Si-legering. Beräkningarna av den kemiska interaktionen resulterar i sin tur i att flera hårda utskiljningar kan fastna på eller transformera på ytan mellan arbetsstycket och verktyget, till exempel SiC, Al4C3och diamant från verktyget. Resultaten från detta arbete visar att det går att förutsäga fasomvandlingar mellan skär och arbetsstycket, samt att detta kan användas som indata för skärförslitning under utvecklingen av verktygslösningar.
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PAOLA, JEAN C. C. de. "Efeito de tratamentos termicos e da adicao de cromo nas propriedades mecanicas de ligas Fe-24 atAl." reponame:Repositório Institucional do IPEN, 1998. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10664.
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Dissertacao(Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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FERRARI, RICARDO B. "Caracterizacao de liga metalica a base de aluminio-magnesio obtida por metodo convencional apos tratamentos termomecanicos visando estruturas microcristalinas." reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11775.
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IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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ESPOSITO, IARA M. "Caracterização e cinética de recristalização da liga de alumínio 6063 após tratamentos termomecânicos." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11478.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
47
YOSHIKAWA, DANIEL S. "Efeito de tratamentos de modificação da superfície na resistência à corrosão do alumínio 1050." reponame:Repositório Institucional do IPEN, 2011. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9970.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
48
Linder, Jenny. "Alcoholate corrosion of aluminium in ethanol blends -the effects of water content, surface treatments, temperature, time and pressure." Thesis, KTH, Skolan för kemivetenskap (CHE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145856.
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As it becomes more important to replace fossil fuels with alternative fuels, biofuels like ethanol are becoming more commercially used. The increased use of ethanol brings good influences such as lower impact on the environment. However, the use of ethanol can also bring negative effects regarding corrosion of metals. In the automotive industry aluminium has been seen affected by a novel very aggressive corrosion phenomenon, alcoholate corrosion. This master thesis investigation has investigated the effect of a few parameters of importance for alcoholate corrosion; water, temperature, time and pressure. The aluminium alloys AA6063 and A380 have been investigated and the capacity of five different surface treatments of AA6063 has been tested to observe if they inhibit the effect of alcoholate corrosion. Throughout the experiments the water dependence of alcoholate corrosion has showed to be of large importance for the corrosion process. An increase in water content will postpone the start of alcoholate corrosion or prevent corrosion to occur. A correlation between temperature and time has been observed. Higher temperatures results in a shorter time period of exposure before alcoholate corrosion occurs, and vice versa. The effect of different pressures was investigated and showed no effect on alcoholate corrosion when using pressurisation with the inert nitrogen gas. All surface treatments revealed a capacity to protect the aluminium alloy against alcoholate corrosion to different extent. The electroless nickel plating seemed to prevent alcoholate corrosion while the Keronite coating seemed more sensitive to this form of corrosion.
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Bainbridge, Ian Frank. "The influence of molten metal surface properties on the formation of surface defects on vertical direct chill cast aluminium alloy products /." [St. Lucia, Qld.], 2005. http://adt.library.uq.edu.au/public/adt-QU20060116.141809/index.html.
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Strahin, Brandon L. "WEAR AND CORROSION RESISTANT TRIBOLOGICAL SURFACE TREATMENTS FOR TITANIUM ALLOYS: EVALUATION OF COMPLIMENTARY AND SUPPLEMENTARY DUPLEX TREATMENT PROCESSES." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1555110923128525.
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