厌氧条件下钴铬钼合金在模拟体液中的摩擦腐蚀行为

IF 5.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Wear Pub Date : 2024-07-31 DOI:10.1016/j.wear.2024.205523
J. Qi , T. Cole , A. Foster , W.M. Rainforth
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引用次数: 0

摘要

CoCrMo 因其出色的强度、耐腐蚀性和生物相容性,长期以来一直被用作植入材料。材料表面形成的一层薄薄的被动氧化膜对其性能起着至关重要的作用。这种被动膜在两个表面接触时可能会破裂,但通常会在短时间内重整。不过,薄膜的重整取决于周围液体中氧气的含量。植入物周围的人体组织、软骨和滑液中的氧含量远低于实验室在露天条件下进行的测试。此外,不同患者体内的局部氧气浓度和 pH 值也不尽相同,这取决于患者的健康状况和其他因素,从而导致金属植入物的耐腐蚀性能发生变化。因此,在某一时期表现良好的植入体,在另一时期可能仍会出现不理想的腐蚀程度。因此,在露天条件下对植入物材料进行摩擦腐蚀评估并不能反映植入物进入人体后的实际过程,尤其是在受伤或手术造成刺激的情况下。在这项研究中,我们研究了钴铬钼合金在生物活性溶液中,在完全有氧和无氧条件下,不同载荷/接触压力下的摩擦腐蚀行为。厌氧条件导致磨损率降低,三膜形成程度减小,但对摩擦力没有明显影响。本文详细讨论了其中的机理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tribocorrosion behaviour of CoCrMo in simulated body fluid under anaerobic conditions

CoCrMo has been used as an implant material for a long time due to its excellent combination of strength, corrosion resistance and biocompatibility. The formation of a thin passive oxide film on the surface of the material plays a crucial role in its performance. This passive film can be ruptured during contact between two surfaces, but usually reforms in short timescales. However, the reformation of the film depends on the availability of oxygen in the surrounding fluid. The oxygen level in human tissue, cartilage and synovial fluid, around which the implant is situated, is much lower than that in laboratory testing under open-air conditions. Moreover, the local oxygen concentration and pH values in the body vary from patient to patient, depending on the patient's health condition and other factors, which leads to variation in the corrosion resistance of metallic implants. Therefore, an implant that performs well at one time may still experience an undesirable level of corrosion at another. Thus, evaluation of the tribocorrosion of implant materials carried out in open-air conditions does not reflect the actual process the implants undergo once in the body, particularly if there is irritation due to injury or surgery. In this study, we investigate the tribocorrosion behaviour of CoCrMo in bioactive solutions under fully aerobic to anaerobic conditions with varying loads/contact pressures. The anaerobic condition leads to a reduction in wear rate and a reduction in the extent of tribofilm formation but does not have an appreciable effect on friction. The mechanisms are discussed in detail.

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来源期刊
Wear
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.
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