Cu对热轧Mg-3Zn-1Y合金微观组织和腐蚀行为的影响
Effects of Cu on Microstructure and Corrosion Behaviour of Hot-Rolled Mg-3Zn-1Y Alloys
张跃忠 1陈小亭 1沈静 1武鹏鹏 2张少华 2刘宝胜2
作者信息
- 1. 太原科技大学化学工程与技术学院,山西太原 030024
- 2. 太原科技大学材料科学与工程学院,山西太原 030024
- 折叠
摘要
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Mg3Zn6Y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.
Abstract
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 of α-Mg matrix and Mg3Zn6Y 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-lY-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.
关键词
腐蚀行为/镁合金/微观组织/MgZnCu相/腐蚀产物Key words
corrosion behaviour/magnesium alloy/microstructure/MgZnCu phase/corrosion product引用本文复制引用
基金项目
Fundamental Research Program of Shanxi Province(202203021222188)
Fundamental Research Program of Shanxi Province(202303021211166)
Central Guiding Science and Technology Development of Local Fund(YDZJSK20231A046)
Key Scientific Research Project in Shanxi Province(202102050201003)
Key Scientific Research Project in Shanxi Province(202203D111001)
出版年
2024
NETL
NSTL
万方数据