| Electrochemical behavior of YAG laser-welded NiTi shape memory alloy |
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| 作者姓名： | 阎小军 杨大智 刘晓鹏 |
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| 作者单位： | School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China |
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| 基金项目： | 国家科技攻关项目;国家自然科学基金 |
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| 摘 要： | Electrochemical behaviors of laser-welded Ti-50.6%Ni（mole fraction） shape memory alloy and the base metal in 0.9% NaCl solution were investigated by electrochemical techniques as corrosion potential measurement, linear and potentiodynamic polarization. The results indicate that the laser-welded NiTi alloy is less susceptible to pitting and crevice corrosion than the base metal, which is demonstrated by the increase in polarization resistance（Rp） and pitting potential（φpit） and decrease in corrosion current density（Jcorr） and mean difference between φpit and φprot values. It is confirmed by scanning electron microscope micrographs that pits could be observed on the surface of base metal but not on the surface of laser-welded alloy after potentiodynamic tests. An improvement of corrosion resistance of laser-welded NiTi alloy could be attributed to almost complete dissolution of inclusions upon laser welding.
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| 关 键 词： | NiTi合金 形状记忆合金 激光焊接 电化学性能 极化 |
| 收稿时间： | 2005-07-11 |
| 修稿时间： | 2006-02-20 |
Electrochemical behavior of YAG laser-welded NiTi shape memory alloy |
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| YAN Xiao-jun,YANG Da-zhi,LIU Xiao-peng.Electrochemical behavior of YAG laser-welded NiTi shape memory alloy[J].Transactions of Nonferrous Metals Society of China,2006,16(3):572-576. |
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| Authors: | YAN Xiao-jun YANG Da-zhi LIU Xiao-peng |
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| Affiliation: | 1. University of Sciences and Technology Houari Boumediene, Bab ezzouar Algiers 16111, Algeria;2. Nuclear Research Centre of Birine, BP 180, Ain Oussera, Djelfa, 17200, Algeria;3. Department of Physics, University of M''sila, M''sila 28000, Algeria |
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| Abstract: | Electrochemical behaviors of laser-welded Ti-50.6%Ni(mole fraction) shape memory alloy and the base metal in 0.9% NaCl solution were investigated by electrochemical techniques as corrosion potential measurement, linear and potentiodynamic polarization. The results indicate that the laser-welded NiTi alloy is less susceptible to pitting and crevice corrosion than the base metal, which is demonstrated by the increase in polarization resistance(Rp) and pitting potential(φpit) and decrease in corrosion current density(Jcorr) and mean difference between φpit and φprot values. It is confirmed by scanning electron microscope micrographs that pits could be observed on the surface of base metal but not on the surface of laser-welded alloy after potentiodynamic tests. An improvement of corrosion resistance of laser-welded NiTi alloy could be attributed to almost complete dissolution of inclusions upon laser welding. |
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| Keywords: | NiTi alloy shape memory alloy laser welding electrochemical behavior polarization |
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