Effect of phosphate conversion film on fatigue and corrosion fatigue behavior of an as-rolled Mg–3.08Zn–0.83Al(in wt.%)alloy  

作　　者：Bao-jie Wang Dao-kui Xu Shuo Wang Xiang-bo Xu En-hou Han 

机构地区：[1]School of Environmental and Chemical Engineering,Shenyang Ligong University,Shenyang,110159,Liaoning,China [2]Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,Liaoning,China [3]Binzhou Institute of Technology,Binzhou,256606,Shandong,China [4]Shandong Key Laboratory of Advanced Aluminium Materials and Technology,Binzhou,256606,Shandong,China [5]Key Lab of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang,110819,Liaoning,China

出　　处：《Journal of Iron and Steel Research International》2023年第12期2557-2565,共9页

基　　金：supported by the National Natural Science Foundation of China Projects(Grant Nos.52071220,51871211,U21A2049,51701129 and 51971054);Liaoning Province's project of“Revitalizing Liaoning Talents”(XLYC1907062);the Doctor Startup Fund of Natural Science Foundation Program of Liaoning Province(No.2019-BS-200);High level achievement construction project of Shenyang Ligong University(SYLUXM202105);the Strategic New Industry Development Special Foundation of Shenzhen(JCYJ20170306141749970);the funds of International Joint Laboratory for Light Alloys,Liaoning BaiQianWan Talents Program,the Domain Foundation of Equipment Advance Research of 13th Five-year Plan(61409220118);National Key Research and Development Program of China(Nos.2017YFB0702001 and 2016YFB0301105);the Innovation Fund of Institute of Metal Research(IMR);Chinese Academy of Sciences(CAS),the National Basic Research Program of China(973 Program)project(Grant No.2013CB632205);the Fundamental Research Fund for the Central Universities(Grant No.N2009006);Bintech-IMR R&D Program(No.GYY-JSBU-2022-009).

摘　　要：Through investigating and comparing the fatigue behavior of an as-rolled Mg–3.08Zn–0.83Al(in wt.%)alloy performing surface phosphate conversion film treatment,it revealed that the determined fatigue strength of surface treated samples at 106 cycles in air was 65 MPa,whereas the fatigue strength was only 35 MPa when tested in 3.5 wt.%NaCl solution.Failure analysis demonstrated that in air,the fatigue crack initiation was mainly dominated by the interaction between the retarding effect of phosphate conversion film on cyclic slips occurring in the underneath substrate.When the matrix cannot endure the accumulated stress concentration due to the irreversibility of cyclic slips,the fatigue crack will preferentially initiate at sample subsurface.Since the phosphate conversion film cracked easily under the cyclic loading and lost its protectiveness on the substrate in 3.5 wt.%NaCl solution,fatigue cracks were preferentially nucleated at the localized corrosion pits.

关 键 词：Mg alloy Corrosion fatigue Surface film PITTING Crack initiation 

分 类 号：TG172[金属学及工艺—金属表面处理]