电化学抛光时间对常规和超细晶TiNi合金生物活性的影响

The effect of electrochemical polishing time on the bioactivity of conventional and ultrafine-grained TiNi alloy

研究了电化学抛光时间(60、180s)对常规和超细晶TiNi合金表面形貌与生物活性的影响。结果表明,电化学抛光时间从60s增加到180s时,常规Ti-Ni合金表面纳米尺度蚀坑数量增多,但仅轻微提高了其生物活性(模拟体液中Ca-P层的生长速率),而超细晶TiNi合金表面纳米蚀坑数量大幅减少,生物活性虽大幅降低,但仍显著高于常规TiNi合金。结果表明,除了增加纳米尺度蚀坑形貌外,组织超细化也是提高生物活性的一个有效方法。

The effect of electrochemical polishing time （60, 180s） on the surface morphology and bioactivity of conventional TiNi and ultrafine-grained TiNi alloy were investigated. The results showed that with the increase of electrochemical polishing time from 60 to 180s, the conventional TiNi alloy exhibited much higher density of nano-scale corrosion pits but only a sligher higher bioactivity （growth rate of Ca-P layer in simulated body fluid）, while the ultrafine-grained TiNi alloy exhibited much lower density of nano-scale corrosion pits and a much lower bioactivity but was higher than that of conventional TiNi alloy. The present results illustruate that besides the nano-scale corrosion pit morphology, the ultrafinement processing of microstructure was an effective approach to improve bioactivity.