采用电化学测试技术研究了人体医用金属材料工 业纯钛和Ti6Al4V合金在人工模拟体液中 的腐蚀行为。 结果表明， 阳极极化后两种合金均未发现点蚀， 工业纯钛的维钝电流密度 小于 Ti6Al4V合金， 前者的阳极极化性能优于后者。 Ti6Al4V合金缝隙试样在阳极电位超过+2 000 m V(vs SCE)后， 电流开始急剧增大， 发生了缝隙腐蚀; 通过电子探针分析发现， 在缝隙内 Al和V 两种元素发生活性溶解。 工业纯钛在电位达到+4 000 mV(vs SCE)时仍没有 发生缝隙腐蚀。
The corrosion behavior of surgery medical mate rials commercially pure Ti (ab ridged as CPTi ) and Ti6Al4V alloy in Ringer's artificial body fluid was st udied with electrochemical methods. The results show that no pittin g corrosion is found on these two alloys. The passivation current density o f CP Ti is lower than that of Ti6Al4V， which indicates that the former's anodic po la rization capacity is better than the latter's. With the polarization potential o ver than 2 000 mV(vs SCE)， the crevice corrosion happens on Ti6A l4V allo y sample. However that is not found on CPTi sample when the potential is 4 000 mV(vs SCE) . The EPMA analy sis of Ti6Al4V alloy crevice corrosive sample shows that Al and V a ctively dissolve， then migrate and electrically deposit.
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