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首页> 外文期刊>Journal of the mechanical behavior of biomedical materials >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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Influence of the sliding velocity and the applied potential on the corrosion and wear behavior of HC CoCrMo biomedical alloy in simulated body fluids

机译：滑动速度和施加电势对HC CoCrMo生物医学合金在模拟体液中的腐蚀和磨损行为的影响

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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.
机译：通过电化学技术和表面显微镜分析了铸态高碳CoCrMo合金浸入磷酸盐缓冲溶液（PBS）和含牛血清白蛋白（PBS + BSA）的磷酸盐缓冲溶液中的腐蚀和摩擦腐蚀行为。在两种溶液中对合金进行电化学表征后，在以不同滑动速度旋转的圆盘球式摩擦计中，通过摩擦电化学方法（通过开路电势，OCP测量，恒电位曲线和恒电位测试）对样品进行了研究。研究了溶液化学，滑动速度和施加电势对CoCrMo合金腐蚀和摩擦腐蚀行为的影响。阳极电流密度随滑动速度而增加，但在施加的阳极电势下磨损率不会改变。另一方面，BSA改变了磨损碎片的行为（通过凝聚通过机械去除颗粒而形成的碎片），从而增加了机械磨损量。在阴极条件下，在机械接触过程中，阴极电流密度也会增加，而磨损率随滑动速度降低，BSA润滑接触，从而减少了相对于不含BSA溶液的总磨损量。这项工作表明，由于严重的磨损加速腐蚀，在施加的阳极电势下，电极电位如何通过增加在施加的阳极电势下的磨损系数而严重地影响腐蚀和摩擦腐蚀速率。

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