Surface oxidation of NiTi shape memory alloy in a boiling aqueous solution containing hydrogen peroxide

被引:65
作者
Chu, CL [1 ]
Chung, CY
Chu, PK
机构
[1] SE Univ, Dept Mat Sci & Engn, Nanjing 210018, Peoples R China
[2] City Univ Hong Kong, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 417卷 / 1-2期
基金
中国国家自然科学基金;
关键词
shape memory alloy (SMA); NiTi; oxidation; surface structure;
D O I
10.1016/j.msea.2005.11.010
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Oxidation behavior and surface characterizations of NiTi shape memory alloy (SMA) treated with a boiling H2O2 aqueous solution were investigated by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and Raman spectroscopy. It is found that the low-temperature oxidation of NiTi SMA in H2O2 solution resulted in the formation of a titania scale enriched with Ti-OH groups. The titania scale is mainly composed of rutile and anatase, and is relatively depleted in Ni, which can improve the biocompatibility of NiTi SMA. Depth profiles of O, Ni and Ti show the titania scale possesses a smooth graded interface structure to NiTi substrate, which is in favor of high bonding strength of the titania scale with NiTi substrate. A different oxidation mechanism for NiTi SMA in H2O2 solution from that for NiTi SMA at high temperature air environment was proposed based on the experimental results. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:104 / 109
页数:6
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