Effect of Zn on mechanical and corrosion properties of Mg-Sc-Zn alloys  

作　　者：Wenjun Ci Xianhua Chen Yue Sun Xu Dai Guanzheng Zhu Di Zhao Fusheng Pan 

机构地区：[1]International Joint Laboratory for Light Alloys(MOE),College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China [2]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400045,China [3]State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China [4]School of Mechanical Engineering,Suzhou University of Science and Technology,Suzhou 215009,China

出　　处：《Journal of Materials Science & Technology》2023年第27期31-42,共12页材料科学技术（英文版）

基　　金：financial support from the fi-nancial supports from the National Key R&D Program of China(No.2021YFB3701100);National Natural Science Foundation of China(Nos.52225101 and 52171103);Guangdong Major Project of Basic and Applied Basic Research(No.2020B0301030006);Fundamental Research Funds for the Central Universities(No.2020CDJDPT001).

摘　　要：The effect of different Zn concentrations(0 wt.%,1 wt.%,3 wt.%,and 6 wt.%)on the microstructure,cor-rosion property,and mechanical property of Mg-0.3Sc-x Zn(x=0 wt.%,1 wt.%,3 wt.%,and 6 wt.%)alloys was investigated.Here,MSZ1 alloy exhibits the highest corrosion resistance(0.194 mm/y)and appropriate mechanical properties with an ultimate tensile strength of 228 MPa and elongation of 19%.The superior corrosion resistance of Mg-0.3Sc-1Zn alloys is attributed to the homogeneous volta-potential distribution and the dense corrosion product film.With the increase in zinc content,the strength and plasticity of Mg-0.3Sc-x Zn alloys(x=0 wt.%,1 wt.%,3 wt.%,6 wt.%)improved to some extent.The precipitated ScZn phase plays the role of the second phase strengthening,which enables MSZ6 to obtain the maximum tensile strength.However,the ScZn phase with low volta potential intensifies the galvanic corrosion,re-sulting in the decline of the corrosion performance.

关 键 词：High corrosion resistance Mechanical performance Mg-Sc-Zn alloys SKPFM Corrosion product film 

分 类 号：TG166.4[金属学及工艺—热处理] TP181[金属学及工艺—金属学] TG146.22[自动化与计算机技术—控制理论与控制工程]