Effect of Mn Addition and Heat Treatment on the Corrosion Behaviour of Mg-Ag-Mn Alloy  

作　　者：You Lv Yupeng Zhang Xi Liu Zehua Dong Xiaorong Zhou Xinxin Zhang 

机构地区：[1]Key Laboratory of Material Chemistry for Energy Conversion and Storage,Ministry of Education,Hubei Key Laboratory of Material Chemistry and Service Failure,School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan,430074,China [2]Hubei Engineering Research Centre for Biomaterials and Medical Protective Materials,Huazhong University of Science and Technology,Wuhan,430074,China [3]Corrosion and Protection Centre,Department of Materials,The University of Manchester,Manchester,M139PL,UK

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第4期665-677,共13页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52001128 and 52371065);the Hubei Provincial Natural Science Foundation of China(No.2023AFB637).

摘　　要：The high corrosion sensitivity and the potential bio-toxicity of Mg-Ag alloys limit their wide applications for the production of implanted devices. In the present work, Mn is added into the Mg-Ag alloy to optimize its corrosion behaviour. The corrosion behaviour of Mg-Ag-Mn alloys is investigated with the underlying microstructural factors examined. The Mg-Ag alloy with 2 wt% Mn exhibits the highest corrosion resistance after post-casting heat treatment at 440 ℃. The addition of Mn results in α-Mn phase with the incorporation of Fe, which suppresses the cathodic activity of impurity Fe. Further, heat treatment of the cast alloys homogenizes the distribution of Ag and promotes the precipitation of α-Mn phase. The former removes Ag segregations as potential cathodes;the latter promotes a more uniform distribution of cathodes and, therefore, prevents localized corrosion.

关 键 词：Mg-Ag alloy Mn addition Post-casting heat treatment Cathodic activity Corrosion mechanism 

分 类 号：TG172[金属学及工艺—金属表面处理]