Corrosion and electrochemical behavior of Mg-Y alloys in 3.5% NaCl solution  

Mg-Y镁合金在3.5%NaCl溶液中的腐蚀和电化学行为(英文)

作　　者：张新[1,2,3] 李永军[1] 张奎[1] 王长顺[2,3] 李宏伟[2,3] 马鸣龙[1] 张宝东[2,3] 

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088 [2]北京市特种车辆部件制造与评估工程技术研究中心,北京100072 [3]北京北方车辆集团有限公司工艺技术中心,北京100072

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第5期1226-1236,共11页中国有色金属学报（英文版）

基　　金：Project(2011BAE22B01)supported by the National Key Technology R&D Program of China;supported by Beijing Engineering Research Center for Advanced Manufacturing and Evaluation of Special Vehicle Parts which is jointly built by Beijing North Vehicle Group Corporation and University of Science and Technology Beijing

摘　　要：The corrosion mechanism of Mg-Y alloys in 3.5% NaCl solution was investigated by electrochemical testing and SEM observation. The electrochemical results indicated that the corrosion potential of Mg-Y alloys in 3.5% NaCl solution increased with the increase of Y addition. The corrosion rate increased with the increase of Y addition because of the increase of Mg24Y5 intermetallic amounts. The corrosion gradually deteriorated with the increase of immersion time. The corrosion morphologies of the alloys were general corrosion for Mg-0.25Y and pitting corrosion for Mg-8Y and Mg-15Y, respectively. The main solid corrosion products were Mg（OH）2 and Mg2（OH）3C1·4H2O.在3.5%NaCl水溶液中通过浸泡、形貌观察和电化学测试研究Mg-Y镁合金的腐蚀性能。结果表明,随着Y含量的增加,Mg-Y合金的腐蚀电位增加。由于第二相Mg24Y5的增加,Mg-Y镁合金的腐蚀速率随着Y含量的增加而逐渐增加。在腐蚀过程中,随着腐蚀时间的延长,合金的腐蚀程度逐渐严重。Mg-0.25Y和Mg-(8,15)Y合金的腐蚀形貌分别为均匀腐蚀和点蚀。Mg-Y镁合金的腐蚀产物主要为Mg(OH)2和Mg2(OH)3Cl·4H2O。

关 键 词：Mg-Y alloy polarization curves pitting corrosion corrosion products 

分 类 号：TG174.36[金属学及工艺—金属表面处理]