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。
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
