EIS of carburised CoCrMo: Evolution of parameters characterising the metal-electrolyte interface
EIS of carburised CoCrMo: Evolution of parameters characterising the metal-electrolyte interface
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渗碳 CoCrMo 的 EIS：表征金属-电解质界面的参数的演变
DOI：
10.1016/j.surfcoat.2016.03.033
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发表时间：
2016
影响因子：
5.4
通讯作者：
J. Buhagiar
中科院分区：
文献类型：
--
作者：
J. Cassar;B. Mallia;A. Karl;J. Buhagiar
腐蚀磨损是钴铬钼（CoCrMo）髋关节植入物的主要问题，因为它会导致假体过早失效，使用低温渗碳处理CoCrMo表面是缓解这一问题的可行研究。这种扩散处理引入了过饱和碳固溶体，即s相，它使CoCrMo硬化，但不会损害其耐腐蚀性。目前对s相表面电化学特性的研究还比较基础，因此从科学和工业的角度来看，还有很大的研究空间。本研究利用电化学阻抗谱（EIS）研究了金属/电解质界面在渗碳后和24小时内的变化。该技术表明，在平衡条件下，CoCrMo/林格溶液界面包含一个高电阻的钝化膜和一个电双层。对比未处理的和渗碳的CoCrMo的阻抗结果，发现处理后的金属具有钝化膜，与未处理的合金相比具有更高的极化电阻。这可能是由于与未经处理的合金钝化膜相比，经过处理的金属钝化膜具有更低的时间常数分散和更快的膜生长动力学。此外，经过20小时的测试，未经处理和渗碳处理的界面极化电阻都有相当大的损失，这表明无源膜阻抗与电化学电位之间存在非单调关系。
Corrosion-wear is of major concern for Cobalt-Chromium-Molybdenum (CoCrMo) hip implants as it leads to premature failure of the prosthesis and treating the CoCrMo surface using low temperature carburising treatment is a plausible investigation to mitigate such problem. This diffusion treatment introduces a supersaturated carbon solid solution, termedS-phase, which hardens the CoCrMo without detriment to the corrosion resistance. There are only basic studies on the electrochemical characteristics ofS-phase surface and therefore, from a scientific and industrial point of view, there is a lot of scope to investigate it further. This research uses electrochemical impedance spectroscopy (EIS) to study the metal/electrolyte interface and how it changes after carburising and over a time span of 24 h. The technique reveals that the CoCrMo/Ringer's solution interface contains a highly resistant passive film and an electrical double layer when under equilibrium conditions. Comparison of the impedance results attained when testing untreated and carburised CoCrMo reveals that the treated metal has a passive film which has higher polarisation resistance compared to that of the untreated alloy. This may have been a consequence of the fact that the treated metal's passive film has lower time constant dispersion and faster film growth kinetics compared to the untreated alloy's passive film. In addition, both untreated and carburised interfaces suffer a considerable loss in their polarisation resistance after 20 h of testing which indicates a non-monotonic relationship between passive film impedance and electrochemical potential.
影响因子：
5.4
作者：
Buhagiar, Joseph;Qian, Linmao;Dong, Hanshan
通讯作者：
Dong, Hanshan