Event Abstract Back to Event Modelling the repassivation kinetics of CoCrMo alloys in simulated body fluids Nazanin Emami1, Jorge Rituerto Sin1, Michel Bryant2 and Anne Neville2 1 Applied Engineering Sciences and Mathematics, Biotribology group, Division of Machine Elements, Sweden 2 University of Leeds, 2Institute of Functional Surfaces, School of Mechanical Engineering,, United Kingdom CoCrMo alloys used for biomedical applications are often exposed to the combined effect of mechanical wear and electrochemical corrosion. Tribocorrosion tests have been performed in this work to investigate the repassivation kinetics of a HC CoCrMo alloy in four different solutions commonly used to simulate body fluids. The repassivation kinetics are analysed by fitting two different exponential equations. The comparison of the different equations reveals that that a second order exponential equation models the repassivation currents more closely than a first order exponential equation. A repassivation model based on a second order exponential equation is suggested. The repassivation currents are divided in two main phases, a ’coverage’ phase and a ’film thickening’ phase. At the initial stage, when part of the surface is exposed to the corrosive media, higher potentials lead to faster repassivation rates. By contrast, potential does not have a clear effect at the thickening phase, when the material is protected by the oxide film formed on top of the surface.Conclusions The repassivation kinetics of a CoCrMo alloy have been investigated. Conclusion: - A second order exponential decay represents the repassivation of the studied CoCrMo alloy more closely than a first order exponential decay under the studied conditions. - The repassivation phenomena can be divided in two phases. First, at the coverage phase, the formation of oxide film that deposits and covers the mechanically damaged part of the surface governs the equation. Second, at the film thickening phase, most of the surface is already repassivated and the thickness of the oxide film grows, being this reaction dominant. - The coverage phase is dominated by the fraction of the surface covered by oxide, whereas the thickness of the reformed passive layer dominates the currents measured during the thickening phase. - The faster repassivation observed at higher potentials at the initial of the repassivation phase or coverage phase indicates that a fraction of the base alloy is exposed to the media, increasing the reactivity of the material. - Sample potential does not have a clear effect on the repassivation time constant at the second repassivation stage or thickening stage because the sample is protected Keywords: joint replacement, corrosion, biomedical application, Implant wear Conference: 10th World Biomaterials Congress, Montréal, Canada, 17 May - 22 May, 2016. Presentation Type: Poster Topic: Surface and interfacial characterization Citation: Emami N, Rituerto Sin J, Bryant M and Neville A (2016). Modelling the repassivation kinetics of CoCrMo alloys in simulated body fluids. Front. Bioeng. Biotechnol. Conference Abstract: 10th World Biomaterials Congress. doi: 10.3389/conf.FBIOE.2016.01.00916 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 27 Mar 2016; Published Online: 30 Mar 2016. Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Nazanin Emami Jorge Rituerto Sin Michel Bryant Anne Neville Google Nazanin Emami Jorge Rituerto Sin Michel Bryant Anne Neville Google Scholar Nazanin Emami Jorge Rituerto Sin Michel Bryant Anne Neville PubMed Nazanin Emami Jorge Rituerto Sin Michel Bryant Anne Neville Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.