Effect of cerium and lanthanum additives on plasma electrolytic oxidation of AZ31 magnesium alloy  

作　　者：沈德久 马豪杰 郭长虹 蔡景瑞 李国龙 何东磊 杨庆祥 

机构地区：[1]State Key Laboratory of Metastable Materials Science and Technology,College of Materials Science and Engineering,Yanshan University [2]College of Mechanical Engineering,Yanshan University

出　　处：《Journal of Rare Earths》2013年第12期1208-1213,共6页稀土学报（英文版）

基　　金：supported by National Natural Science Foundation of China(51171167);Hebei Province Natural Science Foundation(A2011203068)

摘　　要：Plasma electrolytic oxidation（PEO） coatings on AZ31 magnesium（Mg） alloy were developed using the aqueous solution with alkaline silicate and sodium hydroxide as a base electrolyte system.The effects of cerium（Ce） nitrate and lanthanum（La） nitrate additives on the voltage response,microstructure,compositions and corrosion resistance of PEO coatings were investigated by scanning electron microscopy（SEM）,energy-dispersive spectrum（EDS）,X-ray diffraction（XRD） and potentiodynamic polarization tests,etc.The results showed that Ce and La additives increased the stable voltage and compactness of the PEO coatings,while,those did not change the compositions of the PEO coatings.The corrosion resistance of the PEO coating obtained in solutions with La nitrate of 0.1 g/L was the best,followed by that with Ce nitrate of 0.1 g/L and that without additives.Plasma electrolytic oxidation（PEO） coatings on AZ31 magnesium（Mg） alloy were developed using the aqueous solution with alkaline silicate and sodium hydroxide as a base electrolyte system.The effects of cerium（Ce） nitrate and lanthanum（La） nitrate additives on the voltage response,microstructure,compositions and corrosion resistance of PEO coatings were investigated by scanning electron microscopy（SEM）,energy-dispersive spectrum（EDS）,X-ray diffraction（XRD） and potentiodynamic polarization tests,etc.The results showed that Ce and La additives increased the stable voltage and compactness of the PEO coatings,while,those did not change the compositions of the PEO coatings.The corrosion resistance of the PEO coating obtained in solutions with La nitrate of 0.1 g/L was the best,followed by that with Ce nitrate of 0.1 g/L and that without additives.

关 键 词：plasma electrolytic oxidation Mg alloy rare earths corrosion resistance coatings 

分 类 号：TG146.22[一般工业技术—材料科学与工程]