Role of beta Phase during Microarc Oxidation of Mg Alloy AZ91D and Corrosion Resistance of the Oxidation Coating

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	Role of beta Phase during Microarc Oxidation of Mg Alloy AZ91D and Corrosion Resistance of the Oxidation Coating
	Y. Q. Wang; X. J. Wang; T. Zhang; K. Wu; F. H. Wang
	2013
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	29 期号:12 页码:1129-1133
摘要	Selective growth of oxidation coating was observed on Mg alloy AZ91D when this alloy was treated by microarc oxidation (MAO) technique, and then the role of intermetallic phase Mg17Al12 (beta phase) during MAO was investigated. Corrosion resistance and anti-corrosion mechanism of the MAO coating were also studied. Optical microscopy and scanning electron microscopy (SEM) were used to characterize beta phase and coating microstructure. Corrosion properties of the coated alloy were studied by potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS) in 3.5% NaCl solution. Results showed that sparking discharge preferentially occurred on alpha-Mg phase rather than on beta phase at the early stage of MAO; however selective growth of the coating disappeared gradually with the increasing oxidation time and beta phase would not further inhibit coating growth at the prolonged stage of MAO. Mg17Al12 phase ultimately was unable to destroy the integrity and continuity of MAO coating. The MAO coating could restrain charge transfer process and then greatly enhance corrosion resistance of AZ91D alloy. Sealing treatment of MAO coating by stearic acid could further improve the corrosion resistance of AZ91D alloy.
部门归属	[wang, yanqiu ; zhang, tao ; wang, fuhui] harbin engn univ, educ minist, corros & protect lab, key lab superlight mat & surface technol, harbin 150001, peoples r china. [wang, xiaojun ; wu, kun] harbin inst technol, sch mat sci & engn, harbin 150001, peoples r china. [zhang, tao ; wang, fuhui] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. ; wang, yq (reprint author), harbin engn univ, educ minist, corros & protect lab, key lab superlight mat & surface technol, harbin 150001, peoples r china. ; qiuorwang@hrbeu.edu.cn
关键词	Mg Alloy Microarc Oxidation Coating Sparking Discharge Corrosion Resistance Plasma Electrolytic Oxidation Am50 Magnesium Alloy Arc Oxidation Current-density Behavior Microstructure Particles
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72413
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Q. Wang,X. J. Wang,T. Zhang,et al. Role of beta Phase during Microarc Oxidation of Mg Alloy AZ91D and Corrosion Resistance of the Oxidation Coating[J]. Journal of Materials Science & Technology,2013,29(12):1129-1133.
APA	Y. Q. Wang,X. J. Wang,T. Zhang,K. Wu,&F. H. Wang.(2013).Role of beta Phase during Microarc Oxidation of Mg Alloy AZ91D and Corrosion Resistance of the Oxidation Coating.Journal of Materials Science & Technology,29(12),1129-1133.
MLA	Y. Q. Wang,et al."Role of beta Phase during Microarc Oxidation of Mg Alloy AZ91D and Corrosion Resistance of the Oxidation Coating".Journal of Materials Science & Technology 29.12(2013):1129-1133.