Corrosion and electrochemical behavior of as-cast Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloys in 5% NaCl aqueous solution |
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| Authors: | Xin ZHANG Kui ZHANG Xing-gang LI Cong WANG Hong-wei LI Chang-shun WANG Xia DENG |
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| Affiliation: | 1. State Key Laboratory for Fabrication and Processing of Nonferrous Metals, Beijing General Research Institute for Nonferrous Metals, Beijing 100088, China; 2. Beijing Engineering Research Center for Advanced Manufacturing and Evaluation of Special Vehicle Parts, Beijing 100072, China; 3. Institute of Technology, Beijing North Vehicle Group Corporation, Beijing 100072, China;State Key Laboratory for Fabrication and Processing of Nonferrous Metals, Beijing General Research Institute for Nonferrous Metals, Beijing 100088, China;State Key Laboratory for Fabrication and Processing of Nonferrous Metals, Beijing General Research Institute for Nonferrous Metals, Beijing 100088, China;Fengtai Military Representative Office, Beijing Military Representative Office, PLA, Beijing 100072, China;1. Beijing Engineering Research Center for Advanced Manufacturing and Evaluation of Special Vehicle Parts, Beijing 100072, China; 2. Institute of Technology, Beijing North Vehicle Group Corporation, Beijing 100072, China;1. Beijing Engineering Research Center for Advanced Manufacturing and Evaluation of Special Vehicle Parts, Beijing 100072, China; 2. Institute of Technology, Beijing North Vehicle Group Corporation, Beijing 100072, China;State Key Laboratory for Fabrication and Processing of Nonferrous Metals, Beijing General Research Institute for Nonferrous Metals, Beijing 100088, China |
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| Abstract: | The corrosion mechanism of the as-cast Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloy immersed in 5% NaCl aqueous solution was investigated by electrochemical test and SEM. The electrochemical results indicate that the corrosion resistance of Mg-5Y-7Gd-1Nd-0.5Zr alloy in 5% NaCl aqueous solution gradually deteriorates with immersion time increasing from 2 h, 24 h, 60 h, to 108 h, which is consistent with th e SEM observation of corrosion morphologies. The Cl-anion leads to the initiation and development of the corrosion pits, and Mg-5Y-7Gd-1Nd-0.5Zr alloy exhibits filiform type of attack under significant anodic control of magnesium solution reaction. The corrosion potential becomes noble with increasing immersion time. |
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| Keywords: | magnesium alloys Mg-5Y-7Gd-1Nd-0.5Zr corrosion electrochemical behavior |
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