Corrosion Mechanism and Corrosion Model of Mg-Y Alloy in NaCl Solution

徐宏¹，WU Zhiquan²，WANG Xiaoru³，张新^2,4，REN Jiping¹，SHI Yang⁵，WANG Zepu²，WANG Liwei²，LIU Changhua⁶

1. School of Materials Science and Engineering, North University of China2. Institute of Thermal Power Generation Technology, China Datang Coporation Science and Technology Research Institute3. Century College,Beijing University of Posts and Telecommunications4. State Key Lab for Fabrication & Processing of Non-ferrous Metals, Beijing General Research Institute for Non-ferrous Metals5. Shenyang Area Military Representative Office of Armored Military Representative Office, Chinese PLA General Armament Department6. Center of Science and Technology, Beijing North Vehicle Group Corporation

摘 要：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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