Effects of Cu on Microstructure and Corrosion Behaviour of Hot-Rolled Mg-3Zn-1Y Alloys  

Cu对热轧Mg-3Zn-1Y合金微观组织和腐蚀行为的影响

作　　者：Zhang Yuezhong Chen Xiaoting Shen Jing Wu Pengpeng Zhang Shaohua Liu Baosheng 张跃忠;陈小亭;沈静;武鹏鹏;张少华;刘宝胜(太原科技大学化学工程与技术学院,山西太原030024;太原科技大学材料科学与工程学院,山西太原030024)

机构地区：[1]College of Chemical Engineering and Technology,Taiyuan University of Science and Technology,Taiyuan 030024,China [2]College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China

出　　处：《稀有金属材料与工程》2024年第10期2794-2804,共11页Rare Metal Materials and Engineering

基　　金：Fundamental Research Program of Shanxi Province(202203021222188,202303021211166);Central Guiding Science and Technology Development of Local Fund(YDZJSK20231A046);Key Scientific Research Project in Shanxi Province(202102050201003,202203D111001)。

摘　　要：The microstructure and corrosion behaviour of hot-rolled Mg-3Zn-1Y-xCu alloys(x=0,1,3,5,wt%)were investigated.Results show that all Mg-3Zn-1Y-xCu alloys mainly consist ofα-Mg matrix and Mg_(3)Zn_(6)Y phases.The addition of Cu element promotes the formation of MgZnCu phase,and the amount of MgZnCu phase is increased with the increase in Cu content.Electrochemical and immersion test results show that the corrosion resistance of Mg-3Zn-1Y-xCu alloys is deteriorated after Cu addition,which can be attributed to the influence of the microstructure of alloys and the properties of the formed corrosion product film.The MgZnCu phase with high electrochemical potential accelerates the micro-galvanic corrosion as strong cathodic sites,and the decreased protection effect of the corrosion product film results from the variation in PBR value of the related compounds.研究了热轧Mg-3Zn-1Y-xCu合金(x=0、1、3、5,质量分数)的微观组织和腐蚀行为。结果表明,Mg-3Zn-1Y-xCu合金主要包含了α-Mg和Mg_(3)Zn_(6)Y相。添加Cu元素后,合金出现了MgZnCu相,并且MgZnCu相的含量随着Cu含量的增加而增加。电化学和浸泡试验结果表明,添加Cu后Mg-3Zn-1Y-xCu合金的耐腐蚀性能下降,这是因为受到了合金微观组织和腐蚀产物膜性能的影响。具有高电化学电势的MgZnCu相作为强阴极加速了微电偶腐蚀。腐蚀产物膜防护性能的下降源于相应化合物PBR值的改变。

关 键 词：corrosion behaviour magnesium alloy MICROSTRUCTURE MgZnCu phase corrosion product 

分 类 号：TG335.11[金属学及工艺—金属压力加工] TG146.22[一般工业技术—材料科学与工程]