Dissertations / Theses on the topic 'Amines as corrosion inhibitors'
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Smart, A. U. "Industrial boiler system corrosion inhibitors : Studies on the high temperature reactions and properties of aliphatic amines in water." Thesis, University of York, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234970.
Full textDíaz, Jorge G. "Effect of Amines as Corrosion Inhibitors for a Low Carbon Steel in Power Industry." Thesis, University of North Texas, 2004. https://digital.library.unt.edu/ark:/67531/metadc4666/.
Full textPhanasgaonkar, Alka 1956. "Diffusion and protection mechanisms of migratory corrosion inhibitors in reinforced concrete." Monash University, Dept. of Materials Engineering, 2000. http://arrow.monash.edu.au/hdl/1959.1/9200.
Full textMercier, Dimitri Barthes-Labrousse Marie-Geneviève. "Étude des mécanismes de formation de l'interphase dans les systèmes époxy-amine/aluminium." Créteil : Université de Paris-Val-de-Marne, 2007. http://doxa.scd.univ-paris12.fr:8080/theses-npd/th0393941.pdf.
Full textVersion électronique uniquement consultable au sein de l'Université Paris 12 (Intranet). Titre provenant de l'écran-titre. Bibliogr. : 110 réf.
Al-Zubail, Saleh Abdullah. "An evaluation of efficiency of phenylenediamines as corrosion inhibitors for ASTM-A-179 steel in 1.0 N hydrochloric acid at room temperature." Ohio : Ohio University, 1986. http://www.ohiolink.edu/etd/view.cgi?ohiou1183039807.
Full textMercier, Dimitri. "Étude des mécanismes de formation de l'interphase dans les systèmes époxy-amine/aluminium." Paris 12, 2006. https://athena.u-pec.fr/primo-explore/search?query=any,exact,990003939410204611&vid=upec.
Full textWhen they are applied onto aluminium substrates, epoxy-amine liquid monomers react with the oxide-covered metal to form an interphase by dissolution of the oxide layer by amine hardener. This interphase is of particular interest to determine the physical and chemical properties of the bondary (practical adhesion, corrosion resistance and durability). On the other hand diamine molecules are often used as inhibitors of corrosion. The study of the interaction of 1,2-diaminoethane (molecule used as amine curing agent and inhibitor) with aluminium susbstrate has displayed different effects of the molecule on the substrate. The diamine molecule can form a mononuclear inner-sphere complex (bidentate). This complex is not stable and leads to the dissolution of the substrate thus explaining the formation of the interphase. On the other hand the diamine molecule can form a binuclear outer-sphere complex (monodentate or bidentate). This complex is very stable and can protect the substrate
Lima, Eduardo Galdino Alves. "Avaliação da capacidade inibidora da corrosão de aminas a partir do aspecto molecular." Universidade Federal de São Carlos, 2015. https://repositorio.ufscar.br/handle/ufscar/7288.
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This project aims the evaluation of some amines as corrosion inhibitors in carbon steel alloys amid hydrochloric acid (pickling bath). For that, analytical aspects of corrosion process has been considered and the results were interpreted considering the molecular interaction with the metal surface.
Este projeto visa avaliação de algumas aminas como inibidores de corrosão em ligas de aço carbono na presença de ácido clorídrico. Para tal, foram considerados os aspectos reacionais e comportamentais, e os resultados foram interpretados considerando a interação molecular com a superfície metálica.
Tan, Swee Hain. "Organic corrosion inhibitors." Murdoch University, 1991. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20060818.150145.
Full textEl, Moaty Ibrahim S. "Surfactant properties of corrosion inhibitors." Thesis, University of Hull, 2011. http://hydra.hull.ac.uk/resources/hull:5807.
Full textBalaskas, Andronikos. "Corrosion protection by encapsulated inhibitors." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/corrosion-protection-by-encapsulated-inhibitors(6295df0b-7ae9-4e8f-957b-2f9468740cb8).html.
Full textElliott, David. "Corrosion inhibitors for load-bearing steels." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303645.
Full textVuong, J. C. T. "Natural corrosion inhibitors for stainless steel." Thesis, University of Manchester, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539460.
Full textSmith, G. A. W. "Design of environmentally-acceptable corrosion inhibitors." Thesis, University of Aberdeen, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.593457.
Full textPeggs, Lee James. "Electrochemical studies of iron corrosion inhibitors." Thesis, University of Newcastle Upon Tyne, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285364.
Full textRylands, Thaabit. "Corrosion of reinforcement in concrete : the effectiveness of organic corrosion inhibitors." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/9946.
Full textReinforcement corrosion in concrete has presented engineers with the challenge of finding ways of prolonging the service life of structures built in aggressive environments. One method of increasing the durability of concrete in aggressive environments is the use of corrosion inhibitors. In this work, two organic corrosion inhibitors were tested to observe their effectiveness in decreasing the rate of corrosion or delaying the onset of corrosion. One of the inhibitors was a migrating corrosion inhibitor while the other was an admixed inhibitor. The corrosion rate of reinforcement in concrete specimens used in this evaluation, was measured using the Linear Polarisation Resistance method. The performance of the admixed inhibitor was also measured in aqueous phase tests. Results of the tests conducted indicate that the admixed inhibitor does delay the onset of corrosion. The Mel caused short to medium term inhibition when the chloride concentration was less than 1.5%.
Yasakau, Kiryl. "Active corrosion protection of AA2024 by sol-gel coatings with corrosion inhibitors." Doctoral thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/3724.
Full textA indústria aeronáutica utiliza ligas de alumínio de alta resistência para o fabrico dos elementos estruturais dos aviões. As ligas usadas possuem excelentes propriedades mecânicas mas apresentam simultaneamente uma grande tendência para a corrosão. Por esta razão essas ligas necessitam de protecção anticorrosiva eficaz para poderem ser utilizadas com segurança. Até à data, os sistemas anticorrosivos mais eficazes para ligas de alumínio contêm crómio hexavalente na sua composição, sejam pré-tratamentos, camadas de conversão ou pigmentos anticorrosivos. O reconhecimento dos efeitos carcinogénicos do crómio hexavalente levou ao aparecimento de legislação banindo o uso desta forma de crómio pela indústria. Esta decisão trouxe a necessidade de encontrar alternativas ambientalmente inócuas mas igualmente eficazes. O principal objectivo do presente trabalho é o desenvolvimento de prétratamentos anticorrosivos activos para a liga de alumínio 2024, baseados em revestimentos híbridos produzidos pelo método sol-gel. Estes revestimentos deverão possuir boa aderência ao substrato metálico, boas propriedades barreira e capacidade anticorrosiva activa. A protecção activa pode ser alcançada através da incorporação de inibidores anticorrosivos no prétratamento. O objectivo foi atingido através de uma sucessão de etapas. Primeiro investigou-se em detalhe a corrosão localizada (por picada) da liga de alumínio 2024. Os resultados obtidos permitiram uma melhor compreensão da susceptibilidade desta liga a processos de corrosão localizada. Estudaram-se também vários possíveis inibidores de corrosão usando técnicas electroquímicas e microestruturais. Numa segunda etapa desenvolveram-se revestimentos anticorrosivos híbridos orgânico-inorgânico baseados no método sol-gel. Compostos derivados de titania e zirconia foram combinados com siloxanos organofuncionais a fim de obter-se boa aderência entre o revestimento e o substrato metálico assim como boas propriedades barreira. Testes industriais mostraram que estes novos revestimentos são compatíveis com os esquemas de pintura convencionais actualmente em uso. A estabilidade e o prazo de validade das formulações foram optimizados modificando a temperatura de armazenamento e a quantidade de água usada durante a síntese. As formulações sol-gel foram dopadas com os inibidores seleccionados durante a primeira etapa e as propriedades anticorrosivas passivas e activas dos revestimentos obtidos foram estudadas numa terceira etapa do trabalho. Os resultados comprovam a influência dos inibidores nas propriedades anticorrosivas dos revestimentos sol-gel. Em alguns casos a acção activa dos inibidores combinou-se com a protecção passiva dada pelo revestimento mas noutros casos terá ocorrido interacção química entre o inibidor e a matriz de sol-gel, de onde resultou a perda de propriedades protectoras do sistema combinado. Atendendo aos problemas provocados pela adição directa dos inibidores na formulação sol-gel procurou-se, numa quarta etapa, formas alternativas de incorporação. Na primeira, produziu-se uma camada de titania nanoporosa na superfície da liga metálica que serviu de reservatório para os inibidores. O revestimento sol-gel foi aplicado por cima da camada nanoporosa. Os inibidores armazenados nos poros actuam quando o substrato fica exposto ao ambiente agressivo. Numa segunda, os inibidores foram armazenados em nano-reservatórios de sílica ou em nanoargilas (halloysite), os quais foram revestidos por polielectrólitos montados camada a camada. A terceira alternativa consistiu no uso de nano-fios de molibdato de cério amorfo como inibidores anticorrosivos nanoparticulados. Os nano-reservatórios foram incorporados durante a síntese do sol-gel. Qualquer das abordagens permitiu eliminar o efeito negativo do inibidor sobre a estabilidade da matriz do sol-gel. Os revestimentos sol-gel desenvolvidos neste trabalho apresentaram protecção anticorrosiva activa e capacidade de auto-reparação. Os resultados obtidos mostraram o elevado potencial destes revestimentos para a protecção anticorrosiva da liga de alumínio 2024.
The aerospace industry employs high strength aluminum alloys as a constructional material for aircrafts. Aluminum alloys possess advanced mechanical requirements, though suffer from corrosion. Therefore, corrosion protection is always used for aluminum alloys. Up to now the most effective corrosion protection systems include chromium (VI) as the main constituent of pretreatments and corrosion inhibitive pigments. However, the chromates are strongly carcinogenic and the present health regulations banned the use of Cr (VI) containing materials in industry. Consequently, there is a need for environmentally safe corrosion protection systems. The main objective of the present work is the development of active anticorrosion pre-treatments for 2024 aluminum alloy on the basis of hybrid sol-gel layers. The effective corrosion pre-treatment should confer adequate adhesion together with good barrier properties and active corrosion protection ability. The active corrosion protection can be achieved by introducing the corrosion inhibitors in the pre-treatment. Successful fulfilment of the main objective required accomplishing of different stages of the work. At first the localized corrosion of AA2024 was investigated in detail. The obtained results provide better understanding of the intimate aspects of the corrosion susceptibility of AA2024. Different prospective corrosion inhibitors were investigated using electrochemical and microstructural methods. At the second stage the development of hybrid sol-gel coatings was performed. Titania and zirconia based derivatives were combined with organofunctional silanes in order to provide the enhanced adhesion between the metal and the coating and to confer good barrier properties. Industrial tests show that the developed sol-gel coatings are compatible with common organic protection systems. The stability and life time of the sol-gel formulations were also optimized by changing the storage temperature and the amount of water during the synthesis. Sol-gel systems were doped with the selected corrosion inhibitors and studied from the point of view of passive and active corrosion protective properties at the third stage of the work. The results demonstrate the influence of the inhibitive additives on the corrosion performance of the sol-gel coatings. Some inhibitors can provide active corrosion protection in combination with the sol-gel coating, but some chemically interact with the sol-gel matrix resulting in failure of the protective properties of coatings. New approaches of inhibitor incorporation and delivery were used in the fourth stage of the work due to problems associated with the direct introduction of inhibitors in the sol-gels. A nanoporous titania-based pre-layer applied directly to the alloy was employed for storage and release of inhibitors. Nanocontainers of corrosion inhibitors based on silica and halloysite nanoclay with Layer-by- Layer assembled polyelectrolyte shells were used in the second approach. Amorphous cerium molybdate nanowires have been used as corrosion inhibitor nanoparticles in the third approach. During the sol-gel synthesis these nanocontainers were added to impart active corrosion protective properties of the sol-gel coatings. Using these approaches the negative effect of inhibitor on the sol-gel matrix stability was eliminated. The developed sol-gel pretreatments demonstrate important active corrosion protection and self-healing ability. The obtained results show high potential of the developed hybrid sol-gel pretreatment doped with corrosion inhibitors for the corrosion protection of AA2024.
FCT; FSE - SFRH/BD/25469/2005
Ghareba, Saad. "Inhibition of carbon steel corrosion by long alkyl-chain amino acid corrosion inhibitors." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104608.
Full textL'acier au carbone est le matériel le plus couramment utilisé pour les équipements et les pipelines reliés aux processus de production pétrolière. Toutefois, la présence de certains éléments comme l'eau, les sels and le dioxyde de carbone dans l'huile pose plusieurs problèmes reliés à l'augmentation du taux de corrosion du matériel. La façon la plus répandue d'éliminer ce problème est l'utilisation d'inhibiteurs de corrosion. Il est cependant important de mentionner que la majorité de ces inhibiteurs sont nocifs pour l'être humain. Il est donc nécessaire de développer des composés compatibles avec l'environnement et biodégradables et ceci peut être fait avec l'utilisation d'acides aminés.Ce projet a pour but d'étudier l'influence des acides aminés "11-aminoundecanoic acid" (11AA) et "12-aminododecanoic acid" (12AA) en tant que qu'inhibiteurs pour l'acier carbone dans l'acide chlorhydrique et plusieurs autres électrolytes utilisés dans certaines industries.Dans cette étude, l'effet inhibiteur du 12AA sur la corrosion de l'acier carbone dans une solution sans ou saturée en dioxyde de carbone et avec 0.5 M d'acide chlorhydrique a été étudié. Différents paramètres tels que la concentration des inhibiteurs, la concentration des électrolytes, le pH, la température, le temps de traitement, la rugosité de surface, le taux de flux et les différents types d'électrolytes furent analysés pour mieux comprendre le mécanisme de fonctionnement. De plus, l'interaction du 11AA avec la surface de l'acier à certaines conditions fut également prise en considération.Il fut démontré que le 12AA inhibait les corrosions partielles et démontrait une corrosion anodique légèrement plus inhibée. Ceci nous a donc indiqué que cet inhibiteur était de type mixte. Le mécanisme de protection de la corrosion se faisait par adsorption de l'inhibiteur 12AA et cela procurait une protection hydrophobique contre les ions corrosifs avec une efficacité de 98%. L'adsorption de 12AA à la surface de l'acier suit le modèle de l'isotherme de Langmuir. L'énergie de Gibbs correspondante de cette adsorption a été calculée comme étant environ −26 (sans CO2) et −28 kJ mol−1 (saturée en CO2 et 0.5 M HCl). Ceci a indiqué que la formation de la couche (composée d'une épaisseur) est amorphe et que cela est causé par la répulsion engendrée avec les groupes voisins de même charge positive et par le caractère très hétérogène de la surface. L'étude a aussi démontré que le 12AA peut être très efficace contre la corrosion de l'acier carbone et ce avec une grande variété d'électrolytes et d'acides. Il est important de mentionner que l'inhibiteur est inefficace contre l'acide nitrique et sulfurique. L'inhibiteur peut aussi réduire la corrosion lorsque le pH est élevé, mais voit son efficacité réduite dans ces conditions en raison de l'augmentation de sa solubilité. Finalement, le 12AA semble aussi performant avec toutes les rugosités. L'effet et le type de flux d'une solution de HCl saturée en dioxyde de carbone fut aussi étudié avec l'aide d'une électrode à disque rotatif. L'inhibiteur 12AA (3mM) se démontra très performant à contrer la corrosion dans un espace carré et avec un électrode à disque rotatif. Cependant, lorsque la concentration fut réduite à 1mM la performance de l'inhibiteur diminua et son nombre de Reynolds fut augmenté. Ceci fut causé par désorption de 12AA de la surface de l'acier. Cet inhibiteur ne fut donc pas efficace à protéger l'acier carbone dans ces conditions.L'étude de l'inhibiteur 11AA donna des résultats similaires. Cependant, la protection de l'acier carbone fut plus efficace qu'avec le 12AA à cause que le 11AA est capable de couvrir une surface plus importante tout en faisant une couche plus compacte.
Dominguez, Olivo Juan M. "Electrochemical Model of Carbon Dioxide Corrosion in the Presence of Organic Corrosion Inhibitors." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1577092234789695.
Full textWang, Hansheng. "Electrochemical investigation of "green" film-forming corrosion inhibitors :." Thesis, KTH, Skolan för kemivetenskap (CHE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-40888.
Full textDaviot, Jerome. "Organic inhibitors for metal corrosion in resist cleaners." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366779.
Full textHansen, Joan Elizabeth. "A study of polymeric corrosion inhibitors for copper." Case Western Reserve University School of Graduate Studies / OhioLINK, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1057601491.
Full textAnstice, D. J. "Corrosion inhibitors for the rehabilitation of reinforced concrete." Thesis, Aston University, 2000. http://publications.aston.ac.uk/14159/.
Full textCiolkowski, Michal. "Mitigation of corrosion and scale by combined inhibitors." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/13633/.
Full textzhang, peilun. "Zn Corrosion in Alkaline Aqueous Electrolytes: Effect of Electrolyte Composition on Corrosion Rate and Inhibitors to Suppress Corrosion." Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1618400150411797.
Full textKalgutkar, Amit S. "Synthesis and biological evaluation of novel MPTP analogs as potential monoamine oxidase B inhibitors." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-05222007-091412/.
Full textAirey, K. "An electrochemical and analytical study of iron corrosion inhibitors." Thesis, University of Newcastle Upon Tyne, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303326.
Full textRocha, Alexandre Manuel Ferro. "Screening and development of corrosion inhibitors for al alloys." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13942.
Full textThe goal of this work was to systematically seek and study the corrosion and corrosion protection of metallic materials and alloys. Aluminium alloys were the materials in scope due to their specific properties (low density and good mechanical properties) and practical applications, especially in aeronautical industries. The systematic screening and development of corrosion inhibition strategies for extensive localised corrosion conditions at selected Al alloy surfaces has been done. To study these concepts the combination of well-known integral techniques such as EIS with sophisticated localized scanning vibrating probe technique (SVET) was systematically applied. The advantages of combining different techniques and approaches are critically analysed and evaluated from the point of view of corrosion behaviour estimation on different aluminium alloy surfaces in chloride containing electrolytic environments.
O objectivo deste trabalho foi procurar/pesquisar de forma sistemática os efeitos da corrosão em estruturas metálicas e ligas, bem como a protecção das mesmas a este fenómeno. Devido às suas propriedades específicas (baixa densidade e boa resistência mecânica) e aplicações práticas em áreas como a aeronáutica, as ligas de alumínio foram os materiais estudados. Este estudo foi feito através do enquadramento e desenvolvimento de estratégias de inibição da corrosão, à superfície das ligas de alumínio seleccionadas, em condições de extensiva corrosão localizada. A combinação e sistemática aplicação de técnicas de análise electroquímica - desde técnicas bem conhecidas de análise integral (EIS) a técnicas sofisticadas para análise localizada (SVET) - foram as ferramentas usadas para levar a cabo este estudo. As vantagens desta abordagem e da combinação de diferentes técnicas serão criticamente analisadas e avaliadas do ponto de vista da estimativa do comportamento corrosivo nas superfícies das diferentes ligas de alumínio quando em contacto com ambientes electrolíticos que contêm iões cloreto.
Kelly, Brett. "Electrochemical Method for Characterization and Ranking of Corrosion Inhibitors." Thesis, North Dakota State University, 2017. https://hdl.handle.net/10365/28657.
Full textFrey, Abigael. "A Mathematical Model of a Corrosion System Containing Inhibitors." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1525449155620077.
Full textHristova, Roumiana. "Evaluation of corrosion inhibitors in chloride-contaminated reinforced concrete." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/10389.
Full textAhmed, Mohamed. "Inhibition of mild steel corrosion in cooling systems by low- and non-toxic corrosion inhibitors." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/inhibition-of-mild-steel-corrosion-in-cooling-systems-by-low-and-nontoxic-corrosion-inhibitors(7dc2367d-7352-4ab2-85b1-39b09d6487d8).html.
Full textChinthala, Sai Prasanna Prasanna. "Study of Corrosion Inhibitors for Reinforcement Corrosion of Low Carbon Steel in Simulated Pore Solution." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1555601685519345.
Full textFinn, Malcolm. "Certain polyhydroxylated amines in the genesis of dendritic molecules and as potential inhibitors." Thesis, University of Oxford, 2000. https://ora.ox.ac.uk/objects/uuid:ca475832-4ff5-45ba-a0ae-3b8116a4ddca.
Full textStephens, Peter M. B. "Polynuclear transition metal complexes of tetraazamacroycles and their derivatives." Thesis, University of Kent, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385273.
Full textSnowden, M. E. "Studies of corrosion inhibitors for the conservation of mild steel artefacts'." Thesis, University of Portsmouth, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247648.
Full textGarrett, Sharon Ann. "A study of inhibitors of the corrosion of aluminium-copper alloys." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295314.
Full textElshami, Ahmed. "Efficiency of corrosion inhibitors used for concrete structures in aggressive environment." Nantes, 2012. http://www.theses.fr/2012NANT2035.
Full textThe deterioration of a concrete structure may occur due to many processes, which act individually or synergistically. Some examples of processes that cause material deterioration include alkali aggregate reactivity, sulphate attacks, freezing, thawing, cycling, carbonation or salt attack inducing corrosion of concrete reinforcement. Corrosion of reinforcing rebars is one of the most important phenomenon’s that reduce the service life of a concrete structure, and causes a huge impact on the maintenance budget of affected structure. The objective of this research work is to study the long-term durability of different corrosion inhibitors. On the one hand, three additive corrosion inhibitors are selected as representatives : one is a calcium nitrite based corrosion inhibitor (CNI), the other corrosion inhibitors are ethanolamine (AMA) and sodium monoflurophosphate (MFP). They were admixed in water before casting of three different concretes (Ordinary Portland cement concrete (OPCC), blended cement concrete prepared with 30% slag in mass substitution of Portland cement (BCC) and ready-mix concrete (RMC)). In order to characterize the effectiveness of these inhibitors, four approaches are used: one at the level of pore concrete simulating solutions, one at the solution extract of cement level, one at the mortar level and one at the concrete level. The study was performed through the using electrochemical and analytical methods to discuss the inhibition mechanism in the presence of chloride ions. On the other hand, the objective of this study is to explore the efficiency of a new inhibitive pigment zinc-phosphate (ZP) used as coating for rebars and obtained by chemical conversion and cathodic electrochemical treatment, to protect carbon steel rebar against the corrosion by chloride ions in fresh pore concrete simulating solutions and mortars
YANG, HAI. "PLASMA TREATMENT OF ORGANIC INHIBITORS FOR CORROSION PROTECTION OF AEROSPACE ALLOYS." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1058383366.
Full textGriffin, Allian Sophia. "Corrosion in New Construction:Elevated Copper, Effects of Orthophosphate Inhibitors, and Flux Initiated Microbial Growth." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/76951.
Full textMaster of Science
Guo, Xiaolei. "Corrosion inhibition of aluminum alloy 2024-T3 based on smart coatings, hybrid corrosion inhibitors, and organic conversion coatings." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461188604.
Full textMcNeill, Laurie S. "Water Quality Factors Influencing Iron and Lead Corrosion in Drinking Water." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/28242.
Full textPh. D.
Tan, Yong-jun. "Electrochemical studies on carbon dioxide corrosion and its inhibition." Curtin University of Technology, School of Applied Chemistry, 1996. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=11433.
Full textshowed an obvious correlation to their protective ability. Electron microscopy revealed two types of crystal structures on corroded steel coupons. The smaller crystals associated with one of these structures was found to contribute most to corrosion protection.Several typical CO(subscript)2 corrosion inhibitors, including an imidazoline and a quaternised amine, were studied by EIS. A multi-layer model was employed to explain the EIS characteristics and self-repairing ability of imidazoline films. A quaternised amine film is most probably a physically or electrostatically adsorbed molecular layer which forms rapidly and desorbs easily.The deterioration of films, formed by commercial batch treatment inhibitors, was found to occur in three stages which were indicated or characterised by Bode phase-angle plots. A method to determine inhibitor film persistency was developed. This method is based on determining the three stages of inhibitor film deterioration, and the continuous measurement of corrosion rate, which is accessible at the second and third stages of film deterioration.
Gemmill, R. J. "The passivation of aluminium in inhibited red fuming nitric acid." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376493.
Full textChen, Yue. "Inhibition mechanisms of corrosion inhibitors in multiphase flow conditions using electrochemical techniques." Ohio : Ohio University, 2000. http://www.ohiolink.edu/etd/view.cgi?ohiou1179168537.
Full textKlomjit, Pitichon. "Characterization of Inhibition and Leachability of Corrosion Inhibitors in Commercial Primer Systems." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429291171.
Full textZemajtis, Jerzy. "Modeling the Time to Corrosion Initiation for Concretes with Mineral Admixtures and/or Corrosion Inhibitors in Chloride-Laden Environments." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30721.
Full textPh. D.
Espartero, Jennifer C. "Polymeric Materials for Corrosion Protection in Geothermal Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1427901218.
Full textAlexander, Ben. "The use of amines to minimise corrosion in the overhead system of a crude distillation unit." Thesis, University of Surrey, 2002. http://epubs.surrey.ac.uk/843295/.
Full textBaux, Jordan. "Utilisation d'une amine filmante pour la protection des aciers au carbone dans l'industrie nucléaire : apport de la spectroscopie d'impédance électrochimique." Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0128/document.
Full textThe preservation of the secondary circuit of pressurized water reactors during layup periods requires the implementation of specific conditions in order to limit the corrosion phenomena of carbon steels, which constitute the major part of this circuit. These conservation methods are costly and very demanding for the operating. The injection of film-forming amines (FFA), in operation in before shutdown phases, is an interesting route of study to protect carbon steel components while simplifying the conservations. The aim of this thesis work is to study the behavior and the efficiency of an FFA for the protection of carbon steels in the representative conditions of PWRs. To carry out this work, electrochemical impedance spectroscopy was used with surface observations by optical microscopy and scanning electron microscopy and surface analysis by X-ray photoelectron spectroscopy. First, FFA films formed on a carbon steel at low temperature (80 ° C) under optimized deposition conditions were characterized (thickness and permittivity) and their corrosion inhibiting properties evaluated in an Na2SO4 medium at pH close to 10. This study allowed to validate a method for the film characterization through the analysis of the high frequency part of the impedance data. Then, this method was used to follow and characterize the FFA film formation on electrodeposited magnetite in optimized deposition conditions in one hand, and on a carbon steel under the thermo-chemical conditions of the secondary circuit at 120 °C, 220 ° C and 275 °C using FFA concentrations fixed at 2 ppm on the other hand. Impedance monitoring over time of the FFA-treated carbon steel allowed the effectiveness of the films to be followed during humid conservation. The results highlight the influence of FFA film formation conditions (temperature, FFA concentration, treatment time and nature of the substrate) on their efficiency against corrosion during conservation. According to our results, only the treatment at 120 °C resulted in the formation of an FFA film that could protect the carbon steel from corrosion in humid conservation during 30 days. The films formed on bare carbon steel at low temperature showed a high susceptibility to desorption over time, as well as for FFA films deposited at 220 °C, even with a high FFA concentration of 25 ppm. Finally, for FFA deposition made at 275 °C, the decrease of the efficiency against corrosion observed over time would come from the thermal degradation of the FFA, detected in solution beyond 2 hours of exposure to this temperature
Kashyap, Anusha Venkitachalam. "Effects of water chemistry, temperature, gaseous cavitation & phosphate inhibitors on concrete corrosion." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/35788.
Full textConcrete corrosion has serious societal and economic impacts and is an important concern in a utilityâ s overall corrosion control strategy. Though concrete based pipes and linings are only restricted to the distribution mains, they still make up a large percentage of the drinking water infrastructure at about 17% of its total length. An improved understanding of the corrosion mechanisms involved steps that can be taken to mitigate concrete corrosion are very important. This study examined the role of phosphate chemicals, water chemistry, temperature and gaseous cavitation on the degradation of cement-based pipes and linings. It also provides information for utilities to make informed decisions regarding the use, effectiveness, and application of phosphate corrosion inhibitors relative to concrete corrosion control.
Under low alkalinity and low pH conditions, considered to be highly aggressive in the literature, we noticed very substantial corrosion of concrete in laboratory experiments. At high pH and high alkalinity conditions, the buildup of scale (e.g., calcium carbonate) on the inside of the pipe is the major concern. The addition of phosphate inhibitors strongly influenced both concrete corrosion and scaling. At low alkalinity the addition of zinc orthophosphate or polyphosphate reduced corrosion of concrete. The addition of orthophosphate under low alkalinity conditions increased aluminum leaching and could push aluminum concentrations above the EPA SMCL threshold. At high alkalinity conditions the addition of orthophosphate is highly effective at reducing scaling, and aluminum leaching was not a concern.
The presence of high concentrations of magnesium and silicon could form magnesium aluminum oxyhydroxides and magnesium silicates which could act as a protective scale on the concrete surface. However, this precipitate forms only at pH values above 9.5. The effectiveness of this protective scale in reducing corrosion of concrete was not established unambiguously in this research. Temperature plays a key role in corrosion of concrete. Calcite solubility increases at lower temperatures however at higher temperatures corrosion of concrete increases, which implies that corrosion of concrete is not driven by calcite solubility. At higher alkalinities scaling of concrete is higher at lower temperatures. This indicates that calcite solubility controls scaling of concrete at higher alkalinities. Tests with gaseous cavitation indicate that corrosion of concrete does not increase in the presence of gaseous cavitation. Vaporous cavitation is more detrimental to concrete than gaseous cavitation.
Master of Science