(江苏大学 先进制造与现代装备技术工程研究院，镇江 212013)
摘 要: 采用电化学抛光工艺对常规TiNi合金和超细晶TiNi合金的表面进行改性，分析经电化学抛光后其表面形貌、耐腐蚀性能、微动摩擦磨损性能和生物活性。结果表明：与常规TiNi合金电化学抛光表面相比，超细晶TiNi合金电化学抛光表面具有更多的小尺寸(纳米尺度)蚀坑、更优的抗模拟体液电化学腐蚀性能(后者的腐蚀速率是前者的1/5)、更小的摩擦因数、更好的耐磨性以及更高的生物活性(后者在模拟体液中Ca-P层的生长速率是前者的2.8倍)。分析认为，以上性能变化是TiNi合金组织超细化使其晶体缺陷增多所致。
关键字: 超细晶TiNi合金；电化学抛光；表面形貌；耐腐蚀性能；微动摩擦磨损性能；生物活性
（Engineering Institute of Advanced Manufacturing and Modern Equipment Technology,
Jiangsu University, Zhenjiang 212013, China）
Abstract:The surfaces of conventional and ultrafine-grained TiNi alloys were modified by the electrochemical polishing process. The surface morphology, corrosion resistance, fretting friction and wear properties and bioactivity of electrochemical polished surface on conventional TiNi alloy and ultrafine-grained TiNi alloy were investigated. The results show that, compared with the electrochemical polished surface of conventional TiNi alloy, the electrochemical polished surface of ultrafine-grained TiNi alloy has more nano-scale corrosion pits, better corrosion resistance (the corrosion rate of the latter is 1/5 of that of the former) in the Kokubo simulated body fluid, lower friction coefficient, better wear resistance and higher bioactivity (the growth rate of Ca-P layer immersed in simulated body fluid is 2.8 times of that of the former). It is believed that the improvements mentioned above are caused by the increase of crystal defects due to the microstructure ultrafinement.
Key words: ultrafine-grained TiNi alloy; electrochemical polishing; surface morphology; corrosion resistance; fretting friction and wear properties; bioactivity
