在Hank’s人工模拟体液中对TiNiCu形状记忆合金的电化学行为进行了研究 .结果表明 ,TiNiCu合金阳极极化时 ,于酸性条件下合金的钝化区较窄、在 10 0～ 150mV电位区间出现了阳极活性溶解 ,钝化膜受到破坏 .pH的降低和Cl- 浓度的升高 ,使孔蚀电位负移 .在Hank’s人工模拟体液中TiNiCu合金的电化学性能比TiNi形状记忆合金劣 ,其原因是TiNiCu合金的晶体结构不单一 ,造成电化学性质不均一 ,构成腐蚀原电池 ,加之晶界析出富Ti的Ti2 Ni析出物成为孔蚀诱发的敏感位置

The study of TiNiCu shape memory alloys(SMA) in Hank's simulated body fluid was carried out.The results showed that narrow passive range was found in acid environment and active anodic dissolution was discovered at 100～150 mV vs SCE on anodic polarization cure of TiNiCu SMA.Temperature had little effect on anodic polarization.With the decrease of pH and the increase of Cl - concentration,pitting corrosion potential ( E b) shifted negatively.The electrochemical capability of TiNiCu SMA was inferior to that of TiNi SMA.Observations by means of XRD and SEM indicate that TiNiCu SMA is not in single crystal structure,which caused irregular electrochemical behavior and might form the original cell,moreover Ti 2Ni intermetallic phase and copper with loose structure rich on surface may accelerate the anodic dissolution of specimens.