Influence of chloride ion concentration on initial corrosion of AZ63 magnesium alloy  

氯离子浓度对AZ63镁合金初始腐蚀的影响

作　　者：Branimir N.GRGUR Branimir Z.JUGOVIĆ Milica M.GVOZDENOVIĆ Branimir N.GRGUR;Branimir Z.JUGOVIĆ;Milica M.GVOZDENOVIĆ(Faculty of Technology and Metallurgy,University of Belgrade,Karnegijeva 4,11020 Belgrade,Serbia;Serbian Academy of Science and Arts,Institute of Technical Science,Knez Mihailova 35,11000 Belgrade,Serbia)

机构地区：[1]Faculty of Technology and Metallurgy,University of Belgrade,Karnegijeva 4,11020 Belgrade,Serbia [2]Serbian Academy of Science and Arts,Institute of Technical Science,Knez Mihailova 35,11000 Belgrade,Serbia

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第4期1133-1143,共11页中国有色金属学报（英文版）

基　　金：supported by the Ministry of Education,Science and Technological Development of the Republic of Serbia(Nos.451-03-9/2021-14/200135,451-03-9/2021-14/200175)。

摘　　要：The initial corrosion behavior of AZ63 magnesium alloy was investigated in 1,3,5 and 7 wt.%NaCl solutions by means of corrosion potential,linear polarization,electrochemical impedance spectroscopy,and polarization measurements,during exposure in the corrosion media.Results show that the increase in chloride concentration provokes an increase in the corrosion rate.Based on the obtained kinetics parameters the mechanisms of anodic dissolution and hydrogen evolution reactions were discussed,and kinetic models were proposed.It is concluded that anodic dissolution proceeds under Temkin conditions and hydrogen evolution reaction depends on the surface coverage of Mg(OH);species.采用腐蚀电位、线极化、电化学阻抗谱和极化测量等方法研究AZ63镁合金在1%、3%、5%和7%NaCl(质量分数)腐蚀介质中的初始腐蚀行为。结果表明,随着氯离子浓度的增加,腐蚀速率加快。基于得到的动力学参数,讨论了阳极溶解和析氢反应的机理,并建立了动力学模型。结果显示,阳极溶解是发生在Temkin条件下,析氢反应取决于Mg(OH);的表面覆盖度。

关 键 词：CHLORIDE corrosion potential linear polarization reaction order KINETICS 

分 类 号：TG178[金属学及工艺—金属表面处理]