Electrolytic Passivation of Nitinol Shape Memory Alloy in Different Electrolytes |
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引用本文: | SU Xiang-dong WANG Tian-min HAO Wei-chang HE Li. Electrolytic Passivation of Nitinol Shape Memory Alloy in Different Electrolytes[J]. 中国航空学报, 2006, 19(B12): 113-118 |
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作者姓名: | SU Xiang-dong WANG Tian-min HAO Wei-chang HE Li |
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作者单位: | [1]Center of Materials Physics and Chemistry, Beijing University of Astronautics and Aeronautics, Beijing 100083, China [2]Guizhou Academy of Science, Guiyang 55000, China |
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基金项目: | Local Governmental Foundation of Guizhou province (2142005) |
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摘 要: | The corrosion behavior of the nitinol alloy was studied in various corrosion media of different Cl^- ion concentrations. The results demonstrate that the Cl^- ion concentration has significant influences on the corrosion behavior of the nitinol alloy. In order to enhance the corrosion resistance, protective films were generated on the surface of the nitinol alloy by means of the electrochemical passivation method, for which five different electrolytic solutions were investigated. The surface analysis indicates full growth of all samples passivated in the different electrolytic solutions with layers, however, showing different morphological features. Without any defects like micro-cracks and pores, the surface of the samples passivated in the molybdate solution turns out smoother and denser than those passivated in other solutions. It is shown that the electro-chemical passivation will reduce Ni content but increase Ti content in the surface, reaching the Mole ratio of Ti:Ni = 9.01:1 on the outermost surface. Potentiodynamic polarization test demonstrates that the samples electrochemically passivated in the molybdate solution present a significant increase in breakdown potential due to titanium enrichment on the outermost surface.
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关 键 词: | 镍钛诺形状记忆合金 电解液 电解钝化 氯离子腐蚀 氧化膜 |
收稿时间: | 2006-08-10 |
修稿时间: | 2006-11-06 |
Electrolytic Passivation of Nitinol Shape Memory Alloy in Different Electrolytes |
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Abstract: | |
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Keywords: | NiTi alloy Cl^- ion corrosion electrolytic passivation TiO2 coating |
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