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Effect of proteins and phosphates on the degradation and repassivation of CoCrMo alloys under tribocorrosion conditions
Institute of Functional Surface, University of Leeds, Leeds, UK.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-8676-8819
Institute of Functional Surface, University of Leeds, Leeds, UK.
2020 (English)In: Tribology - Materials, Surfaces & Interfaces, ISSN 1751-5831, E-ISSN 1751-584XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

Cobalt-chromium-molybdenum alloys are commonly used for biomedical applications such as dental implants and joint implants. Once the material is implanted into the body it is exposed to the corrosiveness of biological fluids and, in some cases, to mechanical loading that can lead to the combined action of wear and corrosion; better known as tribocorrosion. The effect of four different simulated body fluids on the tribocorrosion behaviour of a CoCrMo alloy has been investigated. The degradation of the studied CoCrMo alloys due to tribocorrosion shows a great dependence on the chemical composition of the media. Phosphate-buffered saline (PBS)-based solutions tend to show higher mass loss than the solutions prepared with distilled water. Phosphates present in PBS tend to accumulate on the surface of the alloy and change its tribological performance. In addition, proteins show a lubricating effect reducing the coefficient of friction of the system in the boundary lubrication regime.

Place, publisher, year, edition, pages
Taylor & Francis, 2020.
Keywords [en]
Tribocorrosion, CoCrMo alloy, PBS, simulated body fluid
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-78392DOI: 10.1080/17515831.2020.1746012ISI: 000525246700001Scopus ID: 2-s2.0-85082869065OAI: oai:DiVA.org:ltu-78392DiVA, id: diva2:1422509
Available from: 2020-04-08 Created: 2020-04-08 Last updated: 2020-04-22

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Rituerto Sin, J.Emami, N.

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