Improving corrosion resistance of Zn-5Al(wt%)alloy by microalloying with samarium  

作　　者：Xiaochao Zhou Wei Shi Song Xiang 

机构地区：[1]College of Materials and Metallurgy,Guizhou University,Guiyang,550025,China [2]Key Laboratory for Mechanical Behavior and Microstructure of Materials of Guizhou Province,Guiyang,550025,China [3]National&Local Joint Engineering Laboratory for High-Performance Metal Structure Material and Advanced Manufacturing Technology,Guiyang,550025,China

出　　处：《Journal of Rare Earths》2023年第10期1636-1644,I0006,共10页稀土学报（英文版）

基　　金：the National Natural Science Foundation of China(51974097,52161010);Central Government Guides Local Science and Technology Development Special Projects(20194011);the Program of"One Hundred Talented People"of Guizhou Province(20164014);Guizhou Province Science and Technology Project(20175656,20175788,20191414,20192162)。

摘　　要：The role of the rare earth element Sm in as-cast Zn-5AI alloy was studied in this work.A three times higher improvement than the control group on corrosion resistance was found with rare earth Sm adding(0.15 wt%).By using an electron prove micro analyzer(EPMA),focused ion beam(FIB)and scanning Kelvin probe force microscopy(SKPFM)techniques,two main mechanisms of the premium performance of the Sm adding were revealed.One was that the non-uniform nucleation and component undercooling induced by Sm adding,reduced theα-AI layer spacing thus improved the covering efficiency of the Al_(2)O_(3)film.The other was that the dissolved Sm in the Zn/Al eutectic structure modulated the electron work function thus induced the attenuation of Volta potential discrepancy.The experimental results show that when the addition of Sm is 0.15 wt%,the minimum Volta potential difference betweenα-AI andη-Zn phases is achieved,and excessive or deficient Sm addition will increase the Volta potential difference.

关 键 词：Zn-5Al Sm Rare earth elements SKPFM Volta potential 

分 类 号：TG146.13[一般工业技术—材料科学与工程]