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Dissertations / Theses on the topic 'Surface pitting'

Author: Grafiati

Published: 4 June 2021

Last updated: 20 February 2023

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1

Daud, A. R. "The surface chemistry of pitting corrosion." Thesis, University of Surrey, 1985. http://epubs.surrey.ac.uk/770155/.

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The use of XPS and AFS technique has been explored in the stLrly of the surface chemistry of a whole electrode surface (XPS) and the surface chemistry of natural pits (AFS). EDXA and to a snall extend SIMS were also used in the investigation of the individual pits. A high resolution Auger electron microscope which has an analytical resolution as snall as 0.1 .un enables a nevly formed pit of less than 2 .un in diameter to be investigated. By using a Cl/Mg ratio an attempt had been made to correlate the surface chemistry of whole electrodes exposed at different potentials in 1M MgCl2 solution t

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2

Franzen, Justin Michael. "Contact Fatigue Evaluation of Ground and Chemically Polished Spur Gears Made of AISI 4118 Alloy Steel." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1370260045.

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3

Tilson, Nial Robert. "An Experimental Evaluation of Micro-pitting Performance of Two Bearing Steels." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1365695328.

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4

Cheong, Kim Hong. "Influence of surface roughness on the pitting corrosion behaviors of stainless steels in different environments." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691159.

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5

Chapman-Kpodo, H. "The surface structures associated with the very early stages of pitting corrosion on stainless steels." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/842894/.

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The surface structures associated with the very early stages of pitting corrosion on stainless steels have been studied using a set of such surface analytical techniques as XPS, ToF-SIMS and SAM combined simultaneously with EDXA. Two types of 316 stainless steel, having minor variation in chemical composition were prepared for this work and passivated chemically in a solution of 0.5 M H2SO4 + 0.5 M NaCI + 0.08% H2O2. Survey and narrow scan XP spectra were acquired from the samples using a V. G. Scientific ESCALAB (II) in Angular XPS format. The survey scans were examined with emphasis on the e

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6

NETO, de JESUS ANTONIO C. "Estudo dos parâmetros: teor de NaCl e acabamento superficial, na resistência à corrosão por PITE em tubos de cobre." reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11614.

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Made available in DSpace on 2014-10-09T12:53:53Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:09:31Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

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7

Klein, Mark Andrew. "An Experimental Investigation of Materials and Surface Treatments on Gear contact Fatigue Life." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243885964.

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8

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 di

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9

Ba, Djiby. "Contribution à l'effet des éléments d'alliage sur la résistance à la corrosion de nuances duplex exposées à des environnements simulant leur marché d'application par le biais d'approches locales." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS060.

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Les aciers inoxydables duplex (DSS) sont caractérisés par une structure biphasée comprenant un mélange de ferrite et d’austénite. La proportion entre les deux phases est d'habitude environ 50 %. Ils sont de plus en plus employés dans les industries chimiques, pétrochimiques, nucléaires, marines et de papier, principalement en raison de leurs excellentes propriétés mécaniques couplées à une bonne résistance à la corrosion par piqûre (basse teneur en nickel et molybdène). L’austénite ayant une composition chimique différente de celle de la ferrite, un film hétérogène se forme à la surface des ac

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10

Weirich, Timothy Douglas. "Evaluating the Potential for Atmospheric Corrosion of 304 Stainless Steel Used for Dry Storage of Spent Nuclear Fuel." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1557098372186951.

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11

Zhang, Huayu. "Contribution à l'optimisation de la teneur en azote des aciers inoxydables austeno-ferritiques économiques par l'étude du comportement en corrosion à l'aide de sondes locales." Thesis, Dijon, 2011. http://www.theses.fr/2011DIJOS046.

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En raison de leurs excellentes propriétés mécaniques, couplées à une bonne résistance à la corrosion par piqûres et à un coût modéré (basse teneur en nickel et en molybdène), les aciers inoxydables austéno-ferritiques (dits aciers inoxydables duplex) sont largement utilisés dans de nombreux secteurs industriels. Les aciers inoxydables duplex ont une microstructure complexe composée à proportion équivalente d’austénite et de ferrite. L’austénite ayant une composition chimique différente de celle de la ferrite, un film hétérogène se forme à la surface des aciers inoxydable duplex. Par ailleurs,

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12

Gravalos, Marcio Tadeu. "Efeitos da usinagem na integridade superficial de um aço inoxidavel superaustenitico." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263125.

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Orientadores: Paulo Roberto Mei, Anselmo Eduardo Diniz<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-12T19:31:21Z (GMT). No. of bitstreams: 1 Gravalos_MarcioTadeu_M.pdf: 4613359 bytes, checksum: 86f814729e45d2e34702f6735566c398 (MD5) Previous issue date: 2008<br>Resumo: Foram investigados os efeitos das condições de usinagem em operação de torneamento na integridade superficial do aço inoxidável superaustenítico ASTM A744 Gr.CN3MN. A operação de acabamento foi o foco principal, porém também foram realiza

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13

Colin, Dominique. "Obtention, corrosion et analyse de surface d'alliages amorphes inoxydables." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0111.

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Apres leur elaboration et leur caracterisation metallurgique (structure, composition, geometrie, stabilite thermique. . . ), cette etude examine les roles de la composition et de la structure de l'alliage sur les tenues a la corrosion generalisee et a la corrosion localisee d'alliages amorphes inoxydables (fe, ni, cr) (p, b) et (fe, cr) (p, b, si) dans des milieux acides sans chlorure et neutres chlorures. Le comportement en corrosion generalisee et la resistance a la corrosion par piqures des alliages amorphes sont compares aux comportements d'aciers inoxydables rapidement solidifies et de l'

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14

Jesus, Antonio Carlos Neto de. "Estudo dos parâmetros: teor de NaCl e acabamento superficial, na resistência à corrosão localizada e generalizada em tubos de cobre." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-07102011-140611/.

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Tubos de cobre fabricados com o material ASTM C12200 (99,9%Cu-0,015-0,040%P) são utilizados mundialmente no transporte de água potável. A maior causa de vazamentos nestas tubulações é a corrosão por pite, que usualmente estão relacionadas com a qualidade da água. Estudos recentes mostraram que vazamentos em tubos de cobre usados para transporte de água de rede pública ocorreram em decorrência da corrosão por pite, o que se deu em virtude da presença do íon cloreto originado do tratamento para a desinfecção da água. Outro parâmetro que pode influenciar a corrosão por pite é a condição de acabam

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15

Guillotte, Ismaël. "Films passifs formés par voie industrielle sur aciers inoxydables : relations entre propriétés physicochimiques et électroniques et résistance à la corrosion localisée." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENI042.

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Bien que dits « inoxydables », les aciers inox peuvent être sujets à diverses formes decorrosion localisée telles que la piqûration. La formation de piqûres, nuisible à l’aspect et à l’intégritéstructurelle du matériau, est notamment contrôlée par les propriétés du film passif protecteur qui seforme à la surface des inox. De nombreuses études ont été menées sur les mécanismes de piqûration desurfaces modèles préparées au laboratoire. Cette thèse, au contraire, étudie les relations entre lespropriétés physico-chimiques et électroniques, d’une part, et la résistance à la corrosion par piqûres,d’

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16

Cafe, Peter F. "Towards reliable contacts of molecular electronic devices to gold electrodes." Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/3870.

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SYNOPSIS OF THIS THESIS The aim of this thesis is to more fully understand and explain the binding mechanism of organic molecules to the Au(111) surface and to explore the conduction of such molecules. It consists of five discreet chapters connected to each other by the central theme of “The Single Molecule Device: Conductance and Binding”. There is a deliberate concentration on azine linkers, in particular those with a 1,10-phenanthroline-type bidentate configuration at each end. This linker unit is called a “molecular alligator clip” and is investigated as an alternative to the thiol linker

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17

Cafe, Peter F. "Towards reliable contacts of molecular electronic devices to gold electrodes." University of Sydney, 2008. http://hdl.handle.net/2123/3870.

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PhD<br>SYNOPSIS OF THIS THESIS The aim of this thesis is to more fully understand and explain the binding mechanism of organic molecules to the Au(111) surface and to explore the conduction of such molecules. It consists of five discreet chapters connected to each other by the central theme of “The Single Molecule Device: Conductance and Binding”. There is a deliberate concentration on azine linkers, in particular those with a 1,10-phenanthroline-type bidentate configuration at each end. This linker unit is called a “molecular alligator clip” and is investigated as an alternative to the thiol

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18

Coudert, Jean-Baptiste. "Impact de l'usinage de superfinition sur la zone affectée par le procédé : application à un matériau multiphasé." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS074.

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Lors de l’usinage, les conditions de pression et de température à la surface usinée sont trèsélevées. La microstructure et l’état mécanique du matériau sont impactés, ce qui a desconséquences sur la réactivité chimique de la surface usinée. Dans cette thèse, ons’intéresse au tournage de superfinition de l’acier inoxydable martensitique X4CrNiMo16-5-1traité thermiquement (dénommé APX4 optimisé). Il présente la particularité d’êtremultiphasé à la température ambiante (martensite, ferrite et austénite). L’objectif est dequantifier les relations entre les conditions de coupe, les propriétés d’usag

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19

Vrček, Aleks. "Micro-pitting and wear characterization for crankshaft roller bearing application." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-68418.

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Efficiency of internal combustion engines (ICEs) is far from optimal. Due to the continuously increasing demands on CO2 regulations, automobile industries are forced to improve such efficiency. A crankshaft roller bearing (CSRB) can lead to significant improvements in engine efficiency. However, before this can be implemented into an actual engine, several challenges have to be addressed. One such challenge is the satisfactory performance of CSRB. The current crankshaft limits the service life since it must act as a roller bearing raceway. Therefore, better material properties are required for

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20

Pacquentin, Wilfried. "Contribution à l'étude des propriétés physico-chimiques des surfaces modifiées par traitement laser : application à l'amélioration de la résistance à la corrosion localisée des aciers inoxydables." Phd thesis, Université de Bourgogne, 2011. http://tel.archives-ouvertes.fr/tel-00676332.

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Les matériaux métalliques sont utilisés dans des conditions de plus en plus sévères et doivent présenter une parfaite intégrité sur des périodes de plus en plus longues. L'objectif de ce travail de thèse est d'évaluer le potentiel d'un traitement de refusion laser pour améliorer la résistance à la corrosion d'un acier inoxydable de type 304L ; l'utilisation du laser dans le domaine des traitements de surface constituant un procédé en pleine évolution à cause des changements récents dans la technologie des lasers. Dans le cadre de ce travail, le choix du laser s'est porté sur un laser nano-impu

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21

Freitas, De Abreu Marcio. "Experimental Study of Metallic Surfaces Exposed to Cavitation." Thesis, KTH, Materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231937.

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Cylinder liners in heavy-duty truck engines are subjected to intense vibrations and may sustain damage from the cavitation of bubbles in the coolant liquid, with some risks of leakage and engine breakdown. An ultrasonic oscillating probe was used to simulate the pitting rates and behavior of samples extracted from cylinder liners, which are made of grey cast iron, with differences in surface roughness, glycol and inhibitor content in coolant, coolant temperature and graphite flake class; bainitic microstructures were also tested. Measurements consisted of mass losses under set intervals during

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22

Moscatelli, Michel. "Role du molybdene dans la dissolution et la passivation d'alliages nickel-molybdene : influence du soufre." Paris 6, 1987. http://www.theses.fr/1987PA066542.

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Les effets d'amelioration des capacites de passivation apportees par le molybdene et les effets de depassivation induits par le soufre adsorbe et en solution solide ont ete etudies en milieu h::(2)so::(4) sur des alliages monocristallins a base de nickel contenant 2% et 6% de molybdene, a l'aide de techniques electrochimiques et radiochimiques (traceur s**(35))

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23

Lin, Chung-Ming, and 林忠民. "Fundamental Studies on Electrical Pitting Mechanism of Lubricated Metal Surface." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/88611386608226108658.

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博士<br>國立中山大學<br>機械與機電工程學系研究所<br>91<br>Abstract The electrical pitting often occurs at the bearing of the ro-tating machinery due to the actions of the shaft voltage and the shaft current resulting in the arcing effect on the lubricated surface and causing the bearing failure. Since the mechanism of the electrical pitting cannot be microscopically observed in process, it is difficult to prevent the bearing damage. Hence, this study uses a static electrical pitting tester with sub -micrometer accuracy to experimentally investigate the effects of supply voltage, supply current, oil film thickness

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24

Chou, Chau-Chang, and 周昭昌. "Tribological Effects of Surface Roughness and EP additive on the Run-In Process and Pitting Behavior of Oil-Lubricated Line Contacts." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/23059756718786907571.

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博士<br>國立成功大學<br>機械工程學系<br>86<br>A gear/cam adapter was employed to study various aspects of line-contact lubrication, using oil with extreme-pressure at two different concentrations. The effect of run-in on the tribological performance of rollers with two different surface roughnesses was investigated in terms of friction coefficient, wear loss, oil temperature, specimen roughness and electrical resistanc?蒞he relation between roller wear loss and the time rate of electrical resistance chang

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25

Klages, Peter E. "In Situ Real-time Visualization and Corrosion Testing of Stainless Steel 316LVM with Emphasis on Digital In-line Holographic Microscopy." 2012. http://hdl.handle.net/10222/15397.

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Digital in-line holographic microscopy (DIHM) has been incorporated as an additional simultaneous in situ optical technique with ellipsomicroscopy for surface imaging and microscopy to study metastable pitting corrosion on stainless steel 316LVM in simulated biological solutions. DIHM adds microscopic volume imaging, allows one to detect local changes of the index of refraction in the vicinity of a pitting event, and allows one to track tracer particles and/or material ejected from the pitting sites. To improve the pitting corrosion resistance of stainless steel 316LVM, a simple surface trea

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26

Lin, Shin-Min, and 林欣民. "Effect of kinematic parameters on electrical pitting formation mechanism for the lubricated surfaces." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/13360882680151672446.

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碩士<br>國立中山大學<br>機械與機電工程學系研究所<br>91<br>When the shaft current passes through the bearing under lubrication condition, the arc often occurs and the pitting can be observed on the surface of bearing. Consequently, the life of bearing is shortened. The pitting resulting from discharge is dependent upon the shaft voltage, the oil film thickness, and the insulation of lubricant. To simulate the pitting, the dynamic pitting tester is developed to investigate the effects of the kinematics parameters on the electrical pitting formation mechanism for the common material of bearing by changing the supply

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27

CHANG, SHEN CHENG, and 沈政昌. "Studies on the Electrical Pitting Mechanism of the Contact Surfaces for Steel Pairs Under AC Electric Field." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/82574480198388386697.

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