(江蘇大學(xué) 先進(jìn)制造與現(xiàn)代裝備技術(shù)工程研究院，鎮(zhèn)江 212013)
摘 要: 采用電化學(xué)拋光工藝對(duì)常規(guī)TiNi合金和超細(xì)晶TiNi合金的表面進(jìn)行改性，分析經(jīng)電化學(xué)拋光后其表面形貌、耐腐蝕性能、微動(dòng)摩擦磨損性能和生物活性。結(jié)果表明：與常規(guī)TiNi合金電化學(xué)拋光表面相比，超細(xì)晶TiNi合金電化學(xué)拋光表面具有更多的小尺寸(納米尺度)蝕坑、更優(yōu)的抗模擬體液電化學(xué)腐蝕性能(后者的腐蝕速率是前者的1/5)、更小的摩擦因數(shù)、更好的耐磨性以及更高的生物活性(后者在模擬體液中Ca-P層的生長(zhǎng)速率是前者的2.8倍)。分析認(rèn)為，以上性能變化是TiNi合金組織超細(xì)化使其晶體缺陷增多所致。
關(guān)鍵字: 超細(xì)晶TiNi合金；電化學(xué)拋光；表面形貌；耐腐蝕性能；微動(dòng)摩擦磨損性能；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
