Mechanistic study of ammonium-induced corrosion of AZ31 magnesium alloy in sulfate solution

作     者：Hui Pan Liwei Wang Yi Lin Feng Ge Kang Zhao Xin Wang Zhongyu Cui Hui Pan;Liwei Wang;Yi Lin;Feng Ge;Kang Zhao;Xin Wang;Zhongyu Cui

作者机构：College of Electromechanical EngineeringQingdao UniversityQingdao 266071China School of Materials Science and EngineeringOcean University of ChinaQingdao 266100China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第54卷第19期

页      面：1-13页

核心收录：

学科分类：080503[工学-材料加工工程] 0806[工学-冶金工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：the financial support of Science and Technology Support Plan for Youth Innovation of Colleges in Shandong Province(No.DC2000000891) the National Natural Science Foundation of China(Nos.51701102 and 51601182) 

主　　题：Magnesium alloy Ammonium Corrosion kinetics Knife-cut like corrosion 

摘      要：The influence of NH4+ions on the corrosion behavior of AZ31 magnesium alloy was investigated by immersion test,hydrogen evolution,electrochemical methods and morphology *** results demonstrate the acceleration effect of NH4+on corrosion of AZ31 magnesium alloy due to the disruption of protective MgO film in NH4+-containing *** loose and cracked corrosion products of AZ31 magnesium alloy in NH4+-containing solutions are mainly composed of(Mg0.833Al0.167)(OH)2(CO3)0.083·0.75H2O and Mg5(CO3)4(OH)2·*** the NH4+concentration is lower than 0.01 M,knife-cut like corrosion occurs in some active area of the surface due to the partial dissolution of MgO *** the NH4+concentration is increased to 0.1 M,the MgO layer is completely disrupted,resulting in the occurrence of uniform *** cathodic and anodic reactions are accelerated by NH4+ions,while the effect of original pH values on the reaction kinetics can be neglected in NH4+-containing solutions.