新型钛锆铌锡合金的耐蚀性研究

目的 评价新型钛锆铌锡合金在人工唾液中的耐蚀性,为钛锆铌锡合金的临床应用提供依据.方法 观察钛锆铌锡合金(Ti-12.5Zr-3Nb-2.5Sn)和对照纯钛(TA2)及钛铝钒合金(Ti-fAl-4V)在人工唾液中的电化学行为,比较极化曲线及极化阻力;检测钛锆铌锡合金和钛铝钒合金在人工唾液中1、2、3、5、7、15 d的离子释出情况.结果 极化曲线显示,钛铝钒合金的击穿电位(0.8 V)低于钛锆铌锡合金(＞2.5 V);钛锆铌锡合金、纯钛在钝化区的维钝电流密度(icorr)基本保持稳定,分别为3.32×10-6～3.46×10-5A/cm2和5.03×10-6～2.65×10-5A/cm2,低于钛铝钒合金(1.45×10-4～1.09×10-3 A/cm2).纯钛、钛锆铌锡合金、钛铝钒合金的极化阻力分别为371.0、252.0、60.1 kΩ·cm2.离子释出结果显示,随浸泡时间增加,两种钛合金的离子溶出量均有不同程度增加,且各时间点钛铝钒合金的离子溶出量均高于钛锆铌锡合金.结论 钛锆铌锡合金在人工唾液中具有良好的耐蚀性,可用于制作口腔修复体.

Corrosion resistance of a new Ti-12. 5Zr-3Nb-2. 5Sn alloy

Objective To evaluate the corrosion resistance of a new titanium alloy for dental restoration in artificial saliva. Methods In simulated oral environment, the electrochemical behavior of a new titanium alloy(Ti-12. 5Zr-3Nb-2. 5Sn) for dental restoration based on the d-electron alloy design method with high elastic modulus, high mechanical and good biological safety properties was investigated together with that of Ti-6Al-4V and TA2 as control groups. The anodic polarization curve and polarization resistance of these alloys were analyzed and the element release of Ti-12.5Zr-3Nb-2.5Sn and Ti-6Al-4V alloy after immersion in artificial saliva for 1,2,3,5,7,15 d were measured. Results Polarization curve indicated that Ti-6Al-4V alloy had lower breakdown potential(0. 8 V) than Ti-12. 5Zr-3Nb-2. 5Sn alloy did (>2. 5 V) . Ti-6A1-4V alloy showed higher passivation current density (1.45 × 10-4 -1.09 × 10-3 A/cm2) than Ti-12. 5Zr-3Nb-2. 5Sn alloy(3. 32 × 10-6-3.46 × 10-5 A/cm2) and TA2(5. 03 × 10-6-2. 65 × 10-5 A/cm2) did. Polarization resistance results showed that polarization resistance volume of TA2, Ti-12. 5Zr-3Nb-2. 5Sn alloy and Ti-6Al-4V alloy were 371.0, 252.0, and 60. 1 kΩ · cm2 respectively. With the increasing of dipping time in artificial saliva, the ion release of Ti-12. 5Zr-3Nb-2. 5Sn alloy and Ti-6Al-4V alloy increased to different degrees. Ti-6Al-4V alloy always showed more ion release than Ti-12. 5Zr-3Nb-2. 5Sn alloy did in the experiment. Conclusions Data from this study indicated that Ti-12. 5Zr-3Nb-2. 5Sn alloy, as a dental restoration material, had good corrosion resistance in artificial saliva.