Corrosion and tribocorrosion resistance of MAO-based composite coating on AZ31 magnesium alloy  

作　　者：Siqin Liu Guihua Li Yuming Qi Zhenjun Peng Yinping Ye Jun Liang 

机构地区：[1]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,PR China [2]Key Laboratory of Science and Technology on Wear and Protection of Materials,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,PR China [3]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,PR China

出　　处：《Journal of Magnesium and Alloys》2022年第12期3406-3417,共12页镁合金学报（英文）

基　　金：the financial supports of National Natural Science Foundation of China (Grant No.52071325)。

摘　　要：In this paper, a multi-functional composite coating with low friction coefficient, high wear resistance and excellent tribocorrosion resistance is fabricated on AZ31 Mg alloys by micro-arc oxidation and spray-coating methods. The microstructure, and composition of the coating are characterized by SEM, EDS, XRD, and FT-IR. Potentiodynamic polarization and EIS tests are conducted to evaluate the corrosion resistance of the composite coating. The tribocorrosion property is also studied using pin-on-disk tribometer in 3.5 wt.% Na Cl solution. It is found that the composite coating possesses better long-term corrosion resistance than the single MAO coating. The tribocorrosion tests prove that the composite coating exhibits much better wear and tribocorrosion resistance than the single MAO coating and can protect the substrate from corrosion under a sliding condition.

关 键 词：Magnesium alloy Micro-arc oxidation Composite coating CORROSION TRIBOCORROSION 

分 类 号：TG174.4[金属学及工艺—金属表面处理]