Tribocorrosion behavior of CoCrMo alloy for hip prosthesis as a function of loads: a comparison between two testing systems.
Tribocorrosion behavior of CoCrMo alloy for hip prosthesis as a function of loads: a comparison between two testing systems.
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DOI：
10.1016/j.wear.2011.01.086
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发表时间：
2011-07-29
期刊：
影响因子：
5
通讯作者：
Wimmer, M. A.
中科院分区：
文献类型：
--
作者：
Mathew, M. T.;Runa, M. J.;Laurent, M.;Jacobs, J. J.;Rocha, L. A.;Wimmer, M. A.
金属对金属 (MOM) 髋关节假体轴承重新受到欢迎，但人们仍然担心磨损碎片和金属离子释放会导致周围组织产生负面反应。因此，进一步了解 MOM 髋部发生的磨损和腐蚀机制至关重要。本研究的目的是评估低碳 CoCrMo 合金的摩擦腐蚀行为，或腐蚀与磨损之间的相互作用，作为负载的函数。使用两种摩擦计配置进行摩擦腐蚀测试。在第一种配置“系统 A”中，线性往复运动的氧化铝球在浸入磷酸盐缓冲溶液 (PBS) 的扁平金属上滑动。在第二种配置“系统B”中，圆柱形金属销的扁平端被压在旋转振荡的氧化铝球上，使用小牛血清（BCS）作为润滑剂和电解质。系统 B 是为模拟体内条件而定制的。摩擦腐蚀测试在-0.345V的恒电位条件下进行，滑动持续时间为1800秒，频率为1Hz。在系统 A 中，施加的载荷为 0.05、0.5 和 1N（分别为 138、296 和 373MPa），在系统 B 中施加的载荷为 16、32 和 64N（分别为 474、597 和 752MPa）。评估了电化学阻抗谱（EIS）和极化电阻。测定了 CoCrMo 中的总质量损失 (Kwc)。测定磨损引起的质量损失（Kw）和腐蚀引起的质量损失（Kc）。随着接触应力的增加，CoCrMo 合金滑动时的主要磨损状态从磨损腐蚀转变为机械磨损。尝试比较这两个系统的摩擦化学反应，并得出对总降解过程的一些见解。我们的结果还表明，血清润滑剂中的蛋白质有助于在滑动过程中形成防止腐蚀的保护层。该研究强调需要适当的方法/指南来比较不同测试系统的结果并转化为解决实际问题。
Metal-on-metal (MOM) hip prosthesis bearings have enjoyed renewed popularity, but concerns remain with wear debris and metal ion release causing a negative response in the surrounding tissues. Further understanding into the wear and corrosion mechanisms occurring in MOM hips is therefore essential. The purpose of this study was to evaluate the tribocorrosion behaviour, or interplay between corrosion and wear, of a low-carbon CoCrMo alloy as a function of loading. The tribocorrosion tests were performed using two tribometer configurations. In the first configuration, “System A”, a linearly reciprocating alumina ball slid against the flat metal immersed in a phosphate buffer solution (PBS). In the second configuration, “System B”, the flat end of a cylindrical metal pin was pressed against an alumina ball that oscillated rotationally, using bovine calf serum (BCS) as the lubricant and electrolyte. System B was custom-built to emulate in vivo conditions. The tribocorrosion tests were performed under potentiostatic conditions at -0.345V, with a sliding duration of 1800 seconds and a frequency of 1Hz. In System A the applied loads were 0.05, 0.5, and 1N (138, 296 and 373MPa, respectively) and in System B were 16, 32, and 64N (474, 597, and 752MPa, respectively). Electrochemical impedance spectroscopy (EIS) and polarization resistance were estimated. The total mass loss (Kwc) in the CoCrMo was determined. The mass loss due to wear (Kw) and that due to corrosion (Kc) were determined. The dominant wear regime for the CoCrMo alloy subjected to sliding changes from wear-corrosion to mechanical wear as the contact stress increases. An attempt was made to compare both system, in their tribochemical responses and formulate some insights in the total degradation processes. Our results also suggest that the proteins in the serum lubricant assist in the generation of a protective layer against corrosion during sliding. The study highlights the need of adequate methodology/guidelines to compare the results from different test systems and translating in solving the practical problems.
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影响因子：
5
作者：
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通讯作者：
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DOI：
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发表时间：
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