Preparation and characterization of a double-layer coating on magnesium alloy AZ91D

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	Preparation and characterization of a double-layer coating on magnesium alloy AZ91D
	L. Y. Zeng; S. W. Yang; W. Zhang; Y. H. Guo; C. W. Yan
	2010
发表期刊	Electrochimica Acta
ISSN	0013-4686
卷号	55 期号:9 页码:3376-3383
摘要	A double-layer coating was prepared on AZ91D alloy by plasma electrolytic oxidation (PEO) plus electroless plating (EP). The plasma eletrolytic oxidation film was prepared in a silicate bath as an inner layer of the coating. Electroless plated Ni-P layer grew from the pores of the PEO film in a nickelous acetate bath and formed as the outer layer of the coating. The microstructure and crystallographic structure was observed with FESEM and XRD. The corrosion resistance of the double-layer coating was evaluated by means of chronopotentiometric (E-t), potentiodynamic polarization (E-i), neutral salt spray test and electrochemical impedance spectroscopy (EIS) test. Compared with the data of as-cast AZ91D magnesium, the open circuit potential of the double-layer coated AZ91D alloy increased by 1.1815 V. while the self-corrosion current density decreased by two orders of magnitude. E-i, EIS result showed that the corrosion resistance of magnesium alloy AZ91D was improved by the double-layer coating. The salt spray test and polarization test results show that the pitting corrosion resistance of AZ91D alloy was improved greatly. An equivalent circuit was proposed to fit the impedance diagrams of AZ91D alloy with the coating. (C) 2010 Elsevier Ltd. All rights reserved.
部门归属	[zeng, liyun] 8357 res inst aerosp, dept qual & proc control, tianjin 300141, peoples r china. [zeng, liyun; yang, shiwei; guo, yahuan] harbin engn univ, coll mat sci & chem engn, harbin 150001, peoples r china. [zhang, wei; yan, chuanwei] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china.;zeng, ly (reprint author), 8357 res inst aerosp, dept qual & proc control, 69 huangwei rd, tianjin 300141, peoples r china;liyunzeng_1982@126.com
关键词	Magnesium Alloy Plasma Electrolytic Oxidation Electroless Plating Corrosion Resistance Coatings Plasma Electrolytic Oxidation Electrochemical Corrosion Impedance Spectroscopy Behavior Crystalline
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WOS记录号	WOS:000276757500047
引用统计	被引频次：81[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31671
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. Y. Zeng,S. W. Yang,W. Zhang,et al. Preparation and characterization of a double-layer coating on magnesium alloy AZ91D[J]. Electrochimica Acta,2010,55(9):3376-3383.
APA	L. Y. Zeng,S. W. Yang,W. Zhang,Y. H. Guo,&C. W. Yan.(2010).Preparation and characterization of a double-layer coating on magnesium alloy AZ91D.Electrochimica Acta,55(9),3376-3383.
MLA	L. Y. Zeng,et al."Preparation and characterization of a double-layer coating on magnesium alloy AZ91D".Electrochimica Acta 55.9(2010):3376-3383.