摘要
Co—Cr—Mo合金是目前广泛用于人工关节制作的材料。但在人体这一特殊的使用环境中，上述合金往往产生各种腐蚀失效行为，造成金属离子的释放，引起严重的生理反应，甚至造成植入的失败。金属关节的性能取决于他们的耐磨损性（与纳米尺寸的磨屑有关）和抗腐蚀性（与离子释放有关），这两种现象通常是紧密联系的。这种涉及摩擦和腐蚀进程的现象通常归纳为摩擦腐蚀。本文采用最简单的0．9％NaCl溶液作为试验液体环境，分别对钴合金进行循环伏安曲线测量和不同电位下的摩擦腐蚀试验及液体环境下的纳米压痕试验。结果表明，钴合金的循环伏安曲线几乎无滞后现象，表现出很好的抗腐蚀性能。而在o．9％NaCl溶液中对钴合金进行摩擦腐蚀试验，发现腐蚀与摩擦共同作用会加速材料的损失，随着外加电位的增加，总的质量损失增加，同时由腐蚀造成的损失逐渐增加，而磨损造成的损失则逐渐减少。
CoCrMo alloys is widely used in the manufacture of artificial joint. But various kinds of corrosion usually make the above material using in the human＇ s body release metallic ions , and lead to seriously physiological reaction, even failure of the implantation. The performance of mental joints depends on their abrasion resistance （relating to nanometer sized abrasive dust）, and resistance to corrosion （relating to ion releasing）.This two properties are usually closely connected. This phenomemon involving friction and corrosion is usually introduced as tribocorrosion. In this study we used 0.9%NaC1 solution as the experiment solution, and measured the cyclic vohammetric curves and carried out tribocorrosion tests under different potential.Besides, with nanoindentation tests in solution, change of electrochemical parameters can be observed. From the experiment we know that,：the Circulation vohammetric curve of Co alloys have no hysteresis, and the alloys showed very good resistance to corrosion. From the tribocorrosion test to Co alloy in 0.9%NaCl solution, we find that the combined action of corrosion and friction will speed up the degradation of material, and the higher impressing potential increasing, the more losses of material. At the same time, the losing caused by corrosion increase, while the losing caused by wear decrease.
作者
刘鹏翔
陈昕
张楠
郭继飞
Liu Pengxiang Chen Xin Zhang Nan Guo Jifei(Building and Construct Research Institute Co., Ltd., of MCC, Beijing 100088, China)
出处
《冶金标准化与质量》
2017年第3期29-35,共7页
Metallurgical Standardization & Quality
关键词
摩擦腐蚀
纳米压痕
电化学
钴合金
tribocorrosion
nanometer indentation
electrochemistry
Co alloy
