Achieving ultra-high corrosion-resistant Mg-Zn-Sc alloys by forming Sc-assisted protective corrosion product film  

作　　者：Wenjun Ci Xianhua Chen Xu Dai Chunquan Liu Yanlong Ma Di Zhao Fusheng Pan 

机构地区：[1]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]College of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China [5]School of Mechanical Engineering,Suzhou University of Science and Technology,Suzhou 215009,China

出　　处：《Journal of Materials Science & Technology》2024年第14期138-151,共14页材料科学技术（英文版）

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

摘　　要：The weak corrosion resistance of magnesium and its alloys greatly limited the industrial application.Though functional self-healing coatings have been proposed as countermeasures,repeated damages on coatings under practical installation and complex external environments could require self-adaptive cor-rosion protection against multiple abrasions.In this study,an ultra-high corrosion-resistant Mg-1Zn-1Sc(wt.%)alloy with a corrosion rate of 0.087 mm/y has been designed and prepared,which has fine grains and uniform structure of a nano-scale ScZn phase with low potential.A unique and dense corrosion prod-uct film with a three-layered structure was found and studied on Mg-1Zn-1Sc alloy,providing excellent corrosion protection.In addition,the formation and protection mechanisms of the three-layered corrosion product film on Mg-1Zn-1Sc alloy have been discussed and proposed.The growth behavior of protective corrosion product film could be driven by the synergy of Sc and Zn elements.Furthermore,with the in-crease of Sc content,the strength,plasticity,and corrosion resistance of Mg-1Zn-x Sc(x=0,0.2,0.6,1.0,in wt.%)alloys increased simultaneously.The high corrosion resistance and moderate mechanical perfor-mance qualify Mg-1Zn-1Sc alloy as a promising candidate for diverse industrial applications.

关 键 词：High corrosion resistance Mechanical performance Mg-Zn-Sc alloy Corrosion product film Three-layer structure SKPFM 

分 类 号：TG174.4[金属学及工艺—金属表面处理]