Influence of the sliding velocity and the applied potential on the corrosion and wear behavior of HC CoCrMo biomedical alloy in simulated body fluids
Influence of the sliding velocity and the applied potential on the corrosion and wear behavior of HC CoCrMo biomedical alloy in simulated body fluids
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DOI：
10.1016/j.jmbbm.2011.07.008
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发表时间：
2011-11-01
影响因子：
3.9
通讯作者：
Igual Munoz, Anna
中科院分区：
文献类型：
--
作者：
Alonso Gil, Roberto;Igual Munoz, Anna
采用电化学技术和表面显微镜分析了铸态高碳 CoCrMo 合金在磷酸盐缓冲溶液 (PBS) 和含牛血清白蛋白的磷酸盐缓冲溶液 (PBS + BSA) 中的腐蚀和摩擦腐蚀行为。对两种溶液中的合金进行电化学表征后，在以不同滑动速度旋转的球盘摩擦计中对样品进行摩擦电化学研究（通过开路电位、OCP 测量、动电位曲线和恒电位测试）。研究了溶液化学、滑动速度和外加电位对 CoCrMo 合金腐蚀和摩擦腐蚀行为的影响。阳极电流密度随着滑动速度的增加而增加，但在施加阳极电位时磨损率不会改变；另一方面，BSA 改变了磨损碎片行为（通过聚集机械去除颗粒形成的碎片），从而增加了机械磨损量。在阴极条件下，机械接触期间阴极电流密度也会增加，而磨损率随着滑动速度而降低，并且 BSA 润滑接触，从而相对于不含 BSA 溶液减少了总磨损体积。这项工作表明，由于严重磨损加速腐蚀，电极电位如何通过增加施加阳极电位下的磨损系数来严重影响腐蚀和摩擦腐蚀速率。 (C) 2011 Elsevier Ltd. 保留所有权利。
The corrosion and tribocorrosion behavior of an as-cast high carbon CoCrMo alloy immersed in phosphate buffered solution (PBS) and phosphate buffered solution with bovine serum albumin (PBS + BSA) have been analyzed by electrochemical techniques and surface microscopy. After the electrochemical characterization of the alloy in both solutions, the sample was studied tribo-electrochemically (by open circuit potential, OCP measurements, potentiodynamic curves and potentiostatic tests) in a ball-on-disk tribometer rotating in different sliding velocities. The influence of solution chemistry, sliding velocity and applied potential on the corrosion and tribocorrosion behavior of the CoCrMo alloy has been studied. Anodic current density increases with sliding velocity but wear rate does not change at an applied anodic potential; on the other hand, BSA modifies the wear debris behavior (by agglomerating the debris formed by mechanical removal of particles) thus increasing the mechanical wear volume. Under cathodic conditions, cathodic current density also increases during mechanical contact while the wear rate decreases with sliding velocity and BSA lubricates the contact thus reducing the total wear volume with respect to the non-containing BSA solution. The work shows how the electrode potential critically affects the corrosion and tribocorrosion rates by increasing the wear coefficients at applied anodic potentials due to severe wear accelerated corrosion. (C) 2011 Elsevier Ltd. All rights reserved.