不同溶液中 NiTi 形状记忆合金钝化膜的表面腐蚀增强。

Surface corrosion enhancement of passive films on NiTi shape memory alloy in different solutions.

机构信息

Beijing Key Laboratory of Fine Ceramics, Institute of Nuclear and New Energy Technology, Tsinghua University, Zhongguancun Street, Haidian District, Beijing 100084, China; State Key Lab of New Ceramic and Fine Processing, Tsinghua University, Beijing 100084, China.

出版信息

Mater Sci Eng C Mater Biol Appl. 2016 Jun;63:192-7. doi: 10.1016/j.msec.2016.02.066. Epub 2016 Feb 27.

DOI:10.1016/j.msec.2016.02.066

PMID:27040211

Abstract

The corrosion behaviors of NiTi shape memory alloy in NaCl solution, H2SO4 solution and borate buffer solution were investigated. It was found that TiO2 in passive film improved the corrosion resistance of NiTi shape memory. However, low corrosion resistance of passive film was observed in low pH value acidic solution due to TiO2 dissolution. Moreover, the corrosion resistance of NiTi shape memory alloy decreased with the increasing of passivated potential in the three solutions. The donor density in passive film increased with the increasing of passivated potential. Different solutions affect the semiconductor characteristics of the passive film. The reducing in the corrosion resistance was attributed to the more donor concentrations in passive film and thinner thickness of the passive film.

摘要

研究了 NiTi 形状记忆合金在 NaCl 溶液、H2SO4 溶液和硼酸盐缓冲溶液中的腐蚀行为。结果表明，钝化膜中的 TiO2 提高了 NiTi 形状记忆合金的耐腐蚀性。然而，由于 TiO2 的溶解，在低 pH 值的酸性溶液中观察到钝化膜的耐腐蚀性较低。此外，在三种溶液中，NiTi 形状记忆合金的耐腐蚀性随着钝化电位的增加而降低。钝化膜中的施主密度随钝化电位的增加而增加。不同的溶液会影响钝化膜的半导体特性。耐腐蚀性的降低归因于钝化膜中更多的施主浓度和更薄的钝化膜厚度。