Formation mechanism of high-temperature oxidation film on WE43 magnesium alloy and its effect on corrosion performance  

作　　者：Ruizhi Ding Hong Yan Fangqiang Ning Yifan Song Jinliang Xu Rongshi Chen 

机构地区：[1]School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao,266590,China [2]Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China

出　　处：《Journal of Rare Earths》2024年第12期2316-2324,I0005,共10页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(52271107);Natural Science Foundation of Shandong Province(ZR2021ME241)。

摘　　要：The oxidation behavior of WE43 magnesium alloy in dry air at three temperatures(225,440 and 525℃)and the corresponding corrosion performance of samples attached to oxide film in 3.5 wt%NaCl solution was investigated.The results show that the oxide films formed at all three temperatures are a complex MgO·RE_(2)O_(3)·ZrO film with different compositions.The film formed at 225℃is flat and dense,whose components are 3.2MgO·1.8RE_(2)O_(3)·1ZrO.The oxidation ridges begin to form,and then gradually grow into nodular oxides and form a loose and porous oxide layer as the temperature increases to 525℃.The oxide films formed at all three temperatures improve the corrosion resistance of the alloy due to the MgO·RE_(2)O_(3)·ZrO,with the protective properties of oxide films following the order of 225℃>440℃>525℃,because the dense MgO·RE_(2)O_(3)·ZrO film formed at 225℃can provide better protection to the substrate than the loose oxide film formed at higher temperatures.

关 键 词：Magnesium alloy High-temperature oxidation Oxide film Corrosion resistance Rare earths 

分 类 号：TG146.22[一般工业技术—材料科学与工程]