Corrosion and tribocorrosion of hafnium in simulated body fluids
Corrosion and tribocorrosion of hafnium in simulated body fluids
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DOI：
10.1002/jbm.b.33097
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发表时间：
2014-08-01
影响因子：
3.4
通讯作者：
Emami, N.
中科院分区：
文献类型：
--
作者：
Sin, J. Rituerto;Neville, A.;Emami, N.
铪是一种惰性金属，具有良好的生物相容性和成骨作用，然而，人们对其在生物环境中的耐磨性和耐腐蚀性知之甚少。使用电化学技术研究了铪和商业纯（CP）钛在模拟体液中的腐蚀和摩擦腐蚀行为。在 0.9% NaCl 溶液和 25% 小牛血清溶液中进行循环极化扫描和开路电位测量，以评估有机物质对金属腐蚀行为的影响。集成了销板配置摩擦计和三电极电化学电池，以研究所研究材料的摩擦腐蚀性能。结果表明，铪具有良好的耐腐蚀性能。其钝化状态下测得的腐蚀密度电流低于CP钛情况下测得的腐蚀密度电流；然而，它更容易遭受局部腐蚀，当表面存在缺陷时，这种腐蚀更加严重。在蛋白质的存在下，氧化层的电化学分解被延迟。摩擦腐蚀试验表明，铪在氧化层受损后具有快速再钝化的能力；然而，在同等磨损腐蚀条件下，它表现出比 CP 钛更高的体积损失。 (C) 2013 年 Wiley 期刊公司。
Hafnium is a passive metal with good biocompatibility and osteogenesis, however, little is known about its resistance to wear and corrosion in biological environments. The corrosion and tribocorrosion behavior of hafnium and commercially pure (CP) titanium in simulated body fluids were investigated using electrochemical techniques. Cyclic polarization scans and open circuit potential measurements were performed in 0.9% NaCl solution and 25% bovine calf serum solution to assess the effect of organic species on the corrosion behavior of the metal. A pin-on-plate configuration tribometer and a three electrode electrochemical cell were integrated to investigate the tribocorrosion performance of the studied materials. The results showed that hafnium has good corrosion resistance. The corrosion density currents measured in its passive state were lower than those measured in the case of CP titanium; however, it showed a higher tendency to suffer from localized corrosion, which was more acute when imperfections were present on the surface. The electrochemical breakdown of the oxide layer was retarded in the presence of proteins. Tribocorrosion tests showed that hafnium has the ability to quickly repassivate after the oxide layer was damaged; however, it showed higher volumetric loss than CP titanium in equivalent wear-corrosion conditions. (C) 2013 Wiley Periodicals, Inc.