Corrosion mechanism and corrosion model of Mg-Y alloy in NaCl solution |
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| Authors: | Hong Xu Zhiquan Wu Xiaoru Wang Xin Zhang Jiping Ren Yang Shi Zepu Wang Liwei Wang Changhua Liu |
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| Affiliation: | 1.School of Materials Science and Engineering,North University of China,Taiyuan,China;2.Institute of Thermal Power Generation Technology,China Datang Coporation Science and Technology Research Institute,Beijing,China;3.Century College,Beijing University of Posts and Telecommunications,Beijing,China;4.State Key Lab for Fabrication & Processing of Non-ferrous Metals,Beijing General Research Institute for Non-ferrous Metals,Beijing,China;5.Shenyang Area Military Representative Office of Armored Military Representative Office,Chinese PLA General Armament Department,Shenyang,China;6.Center of Science and Technology,Beijing North Vehicle Group Corporation,Beijing,China |
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| Abstract: | Corrosion of Mg–Y alloy was studied using electrochemical evaluations, immersion tests and SEM observations. Corrosion mechanisms of Mg-(0.25 and 2.5) Y alloy and Mg-(5, 8, and 15) Y alloy were uniform corrosion and pitting corrosion respectively, and the content of Mg24Y5 phases determined its effect acting as cathode to accelerate the corrosion or corrosion barrier to inhibit the corrosion. Corrosion resistance of Mg-(0.25, 2.5, 5, 8, and 15) Y alloys was as follows: Rt(Mg-0.25Y) < Rt(Mg-8Y) < Rt(Mg-15Y) < Rt(Mg-5Y) < Rt(Mg-2.5Y). Y could significantly improve the corrosion resistance of the Mg-Y alloy, but the excess of Y deteriorated the corrosion resistance of the Mg-Y alloy. The optimum content of Y in the studied alloys was 2.5%. |
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