| Electrolytic Passivation of Nitinol Shape Memory Alloy in Different Electrolytes |
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| 作者姓名： | SU Xiang-donga b WANG Tian-minb * HAO Wei-changa HE Lib aCenter of Materials Physics and Chemistry Beijing University of Astronautics and Aeronautics Beijing China bGuizhou Academy of Science Guiyang China |
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| 作者单位： | SU Xiang-donga，b，WANG Tian-minb，*，HAO Wei-changa，HE Lib aCenter of Materials Physics and Chemistry，Beijing University of Astronautics and Aeronautics，Beijing 100083，China bGuizhou 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 pas-sivated 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 pas-sivated 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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Electrolytic Passivation of Nitinol Shape Memory Alloy in Different Electrolytes |
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| SU Xiang-donga,b,WANG Tian-minb,*,HAO Wei-changa,HE Lib aCenter of Materials Physics and Chemistry,Beijing University of Astronautics and Aeronautics,Beijing ,China bGuizhou Academy of Science,Guiyang ,China.Electrolytic Passivation of Nitinol Shape Memory Alloy in Different Electrolytes[J].Chinese Journal of Aeronautics,2006,19(Z1). |
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| Authors: | SU Xiang-dong WANG Tian-min HAO Wei-chang HE Li |
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| Abstract: | 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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| Keywords: | NiTi alloy Cl- ion corrosion electrolytic passivation TiO2 coating |
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