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

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,comp...

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Bibliographic Details
Published inJournal of rare earths Vol. 31; no. 12; pp. 1208 - 1213
Main Author 沈德久 马豪杰 郭长虹 蔡景瑞 李国龙 何东磊 杨庆祥
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.2013
Subjects
Additives
Alloy development
Alloy systems
AZ31镁合金
Coatings
Corrosion resistance
Electric potential
Magnesium base alloys
Mg alloy
Nitrates
plasma electrolytic oxidation
Protective coatings
Rare earth metals
rare earths
扫描电子显微镜
添加剂
电解氧化
硝酸镧
碱性硅酸盐
金等离子体
铈
plasma electrolytic oxidation
coatings
Mg alloy
corrosion resistance
rare earths
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Summary: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.
Bibliography:11-2788/TF
SHEN Dejiu;MA Haojie;GUO Changhong;CAI Jingrui;LI Guolong;HE Donglei;YANG Qingxiang;State Key Laboratory of Metastable Materials Science and Technology,College of Materials Science and Engineering,Yanshan University;College of Mechanical Engineering,Yanshan University
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; Mg alloy; rare earths; corrosion resistance; coatings
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ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(12)60428-1