采用恒压直流阳极氧化法对医用镍钛合金进行了表面改性处理,目的是有效降低其表面镍含量,改善生物相容性.通过表面形貌、化学成分以及晶相分析发现,改性后的表面氧化层具有特殊的连通多孔结构,平均孔径为80～120 nm,厚度为5～12 μm;该层主要由非晶相TiO2组成,200～400C 30 min热处理可使部分非晶相转化为晶相金红石结构.另外,改性后的表面在Hank's模拟体液中的Ni离子溶出量也比改性前大大减少.综合来看,本文工艺实现了对医用镍钛合金在微观结构和性能上的双重改善,是比较有应用潜力的表面改性工艺.
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