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本文用腐蚀的方法,研究了表面氧化对TiNi形状记忆合金耐腐蚀性能的影响。由于经过表面氧化处理的合金耐蚀性与其表面的氧化膜密切相关,而要获得致密的氧化膜,则关系到Ti、Ni两元素的扩散、氧化,以及氧化膜的生长条件,生长速度等等,所以随着氧化温度、氧化时间、材料本身的表面光洁度、氧化速度等几个影响因素的改变,合金耐蚀性也随之变化。经过实验比较,认为可以采用500℃保温1小时,在不影响合金的形状记忆效应的前提下,以提高表面光洁度、调节真空度来控制试样的氧化速度的表面处理方式,获得质量较好、致密的氧化膜,从而抑制有毒Ni离子的释放,显著地提高TiNi合金的耐腐蚀性能和生物相容性。
In this paper, the effect of surface oxidation on the corrosion resistance of TiNi shape memory alloys was studied by means of corrosion. Since the corrosion resistance of the alloy subjected to the surface oxidation is closely related to the oxide film on the surface thereof, and the dense oxide film is obtained, it is related to the diffusion and oxidation of the two elements Ti and Ni, the growth conditions of the oxide film, the growth rate and the like , So with the oxidation temperature, oxidation time, the surface finish of the material itself, the rate of oxidation and other changes in several factors, the corrosion resistance of the alloy also will change. After experiments, it is considered that the surface treatment method can be used to control the oxidation rate of the sample to improve the surface finish and adjust the degree of vacuum without affecting the shape memory effect of the alloy, so as to obtain a better quality, Dense oxide film, thereby inhibiting the release of toxic Ni ions, significantly improve the TiNi alloy corrosion resistance and biocompatibility.