(大连理工大学 化工学院， 大连 116012)
摘 要: 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 mV(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。
关键字: 人体医用金属材料； 工业纯钛； Ti6Al4V合金；腐蚀行为
Ti6Al4V alloy in artificial body fluid
（School of Chemical Engineering, Dalian University of Technology,
Dalian 116012， P.R.China）
Abstract:The corrosion behavior of surgery medical materials commercially pure Ti (abridged as CPTi ) and Ti6Al4V alloy in Ringer's artificial body fluid was studied with electrochemical methods. The results show that no pitting corrosion is found on these two alloys. The passivation current density of CPTi is lower than that of Ti6Al4V， which indicates that the former's anodic polarization capacity is better than the latter's. With the polarization potential over than 2 000 mV(vs SCE)， the crevice corrosion happens on Ti6Al4V alloy sample. However that is not found on CPTi sample when the potential is 4 000 mV(vs SCE). The EPMA analysis of Ti6Al4V alloy crevice corrosive sample shows that Al and V actively dissolve， then migrate and electrically deposit.
Key words: surgery medical materials; commercial pure Ti; Ti6Al4V alloy; corrosion behavior
