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

作　　者：徐宏 WU Zhiquan WANG Xiaoru 张新 REN Jiping SHI Yang WANG Zepu WANG Liwei LIU Changhua 

机构地区：[1]School of Materials Science and Engineering, North University of China, Taiyuan 030051, China [2]Institute of Thermal Power Generation Technology, China Datang Coporation Science and Technology Research Institute, Beijing 102206, China [3]Century College, Beijing University of Posts and Telecommunications, Beijing 102101, China [4]State Key Lab for Fabrication & Processing of Non-ferrous Metals, Beijing General Research Institute for Non-ferrous Metals, Beijing 100088, China [5]Shenyang Area Military Representative Office of Armored Military Representative Office, Chinese PLA General Armament Department, Shenyang 110016, China [6]Center of Science and Technology, Beijing North Vehicle Group Corporation, Beijing 100072, China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2016年第5期1048-1062,共15页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Key Technology R&D Program of China(Nos.2011BAE22B01 and 2011BAE22B06)

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 Mg_（24）Y_5 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%.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 Mg_（24）Y_5 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%.

关 键 词：Mg-Y corrosion electrochemical weight loss rate 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG172.6[金属学及工艺—金属材料]