Tribocorrosion behaviour of CoCrMo in simulated body fluid with applied potential

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear Pub Date : 2025-09-03 DOI:10.1016/j.wear.2025.206308

J. Qi, W.M. Rainforth

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引用次数: 0

Abstract

CoCrMo alloys have been widely used as implant materials due to their excellent combination of mechanical strength, corrosion resistance and biocompatibility. However, the release of wear debris during service can trigger inflammatory responses in peri-implant tissues, while reactive oxygen species (ROS) generated by the immune response to bacterial infections may alter surface chemistry and wear behaviour. The formation of tribofilms and the accompanying microstructural changes of CoCrMo under electrochemically controlled conditions are not yet fully understood. In particular, the correlation between applied electrochemical potential, tribofilm formation and subsurface microstructural evolution remains unclear.

In this study, we present a detailed investigation of surface microstructural and chemical changes during tribocorrosion tests under different applied potentials, with particular attention to tribofilm formation and surface deformation. Quantitative analysis of surface deformation was performed by measuring the geometrically necessary dislocation (GND) density mapped using precession electron diffraction (PED). A clear correlation between wear rate and surface strain was established. However, the relationship between tribofilm formation, surface strain and the applied potential was more complex.

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CoCrMo在模拟体液中的摩擦腐蚀行为

CoCrMo合金以其优异的机械强度、耐腐蚀性和生物相容性被广泛应用于种植体材料。然而，在使用过程中，磨损碎片的释放会引发种植体周围组织的炎症反应，而细菌感染免疫反应产生的活性氧（ROS）可能会改变表面化学和磨损行为。在电化学控制条件下，CoCrMo摩擦膜的形成和伴随的微观结构变化尚不完全清楚。特别是，应用电化学电位、摩擦膜形成和地下微观结构演变之间的关系尚不清楚。在这项研究中，我们详细研究了不同应用电位下摩擦腐蚀试验过程中的表面微观结构和化学变化，特别关注摩擦膜的形成和表面变形。利用进动电子衍射（PED）测量几何必要位错（GND）密度，对表面变形进行定量分析。磨损率与表面应变之间存在明显的相关性。然而，摩擦膜的形成、表面应变和外加电位之间的关系更为复杂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Wear 工程技术-材料科学：综合

CiteScore

8.80

自引率

8.00%

发文量

280

审稿时长

47 days

期刊介绍： Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.