Effect of proteins and phosphates on the degradation and repassivation of CoCrMo alloys under tribocorrosion conditions

IF 1.6 Q4 MATERIALS SCIENCE, COATINGS & FILMS
M. Bryant, J. R. Sin, N. Emami, A. Neville
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引用次数: 0

Abstract

ABSTRACT 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.
蛋白质和磷酸盐对摩擦腐蚀条件下CoCrMo合金降解和再钝化的影响
钴铬钼合金通常用于生物医学应用,如牙科植入物和关节植入物。一旦材料被植入体内,它就会暴露在生物流体的腐蚀性中,在某些情况下,还会暴露在可能导致磨损和腐蚀共同作用的机械载荷中;更广为人知的是摩擦腐蚀。研究了四种不同模拟体液对CoCrMo合金摩擦腐蚀行为的影响。所研究的CoCrMo合金由于摩擦腐蚀而退化,这在很大程度上取决于介质的化学成分。基于磷酸盐缓冲盐水(PBS)的溶液往往比用蒸馏水制备的溶液显示出更高的质量损失。PBS中存在的磷酸盐倾向于积聚在合金表面并改变其摩擦学性能。此外,蛋白质在边界润滑状态下表现出降低系统摩擦系数的润滑作用。
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来源期刊
Tribology - Materials, Surfaces & Interfaces
Tribology - Materials, Surfaces & Interfaces MATERIALS SCIENCE, COATINGS & FILMS-
CiteScore
2.80
自引率
0.00%
发文量
15
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