Feng Zhiyuan, Xu Charles C, Zhang Dadi, Buchheit Rudolph
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China.
Fontana Corrosion Center, Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USA.
Materials (Basel). 2021 Jan 8;14(2):286. doi: 10.3390/ma14020286.
The study of protective film formation on Mg alloys by exposure to sodium selenite solutions was conducted. Anodic polarization studies, electrochemical impedance spectroscopy studies, morphological analysis, and Energy-dispersive X-ray spectroscopy were performed on AZ31 Mg alloy after coating treatment in different concentrations of sodium selenite. The corrosion resistance was improved by around 5 times compared with control. Improved resistance to localized corrosion was observed in the coatings treated by 5 mM or 10 mM sodium selenite. The protection mechanism was ascribed to the transformation of selenite to insoluble selenium, the formation of insoluble MgSeO hydrate, and polymerization of amorphous selenium.
开展了通过将镁合金暴露于亚硒酸钠溶液来形成保护膜的研究。对AZ31镁合金在不同浓度亚硒酸钠中进行涂层处理后，进行了阳极极化研究、电化学阻抗谱研究、形态分析和能量色散X射线光谱分析。与对照组相比，耐腐蚀性提高了约5倍。在5 mM或10 mM亚硒酸钠处理的涂层中观察到局部腐蚀抗性得到改善。保护机制归因于亚硒酸盐向不溶性硒的转化、不溶性氢氧化镁亚硒酸盐的形成以及非晶态硒的聚合。
