Corrosion behaviors of Zn/Al-Mn alloy composite coatings deposited on magnesium alloy AZ31B (Mg-Al-Zn)

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	Corrosion behaviors of Zn/Al-Mn alloy composite coatings deposited on magnesium alloy AZ31B (Mg-Al-Zn)
	J. F. Zhang; W. Zhang; C. W. Yan; K. Q. Du; F. H. Wang
	2009
发表期刊	Electrochimica Acta
ISSN	0013-4686
卷号	55 期号:2 页码:560-571
摘要	After being pre-plated a zinc layer, an amorphous Al-Mn alloy coating was applied onto the surface of AZ31B magnesium alloy with a bath of molten salts. Then the corrosion performance of the coated magnesium alloy was examined in 3.5% NaCl solution by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results showed that the single Zn layer was active in the test solution with a high corrosion rate while the Al-Mn alloy coating could effectively protect AZ31B magnesium alloy from corrosion in the solution. The high corrosion resistance of Al-Mn alloy coating was ascribed to an intact and stable passive film formed on the coating. The performances of the passive film on Al-Mn alloy were further investigated by Mott-Schottky curve and X-ray photoelectron spectroscopy (XPS) analysis. It was confirmed that the passive film exhibited n-type semiconducting behavior in 3.5% NaCl solution with a carrier density two orders of magnitude less than that formed on pure aluminum electrode. The XPS analysis indicated that the passive film was mainly composed of AlO(OH) after immersion for long time and the content of Mn was negligible in the outer part of the passive film. Based on the EIS measurement, electronic structure and composition analysis of the passive film, a double-layer structure, with a compact inner oxide and a porous outer layer, of the film was proposed for understanding the corrosion process of passive film, with which the experimental observations might be satisfactorily interpreted. (C) 2009 Elsevier Ltd. All rights reserved.
部门归属	[zhang, jifu; zhang, wei; yan, chuanwei; du, keqin; wang, fuhui] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china.;yan, cw (reprint author), chinese acad sci, inst met res, state key lab corros & protect, 62 wencui rd, shenyang 110016, peoples r china;cwyan@imr.ac.cn
关键词	Magnesium Alloy Al-mn Alloy Composite Coatings Corrosion Resistance Eis Plasma Electrolytic Oxidation Molten-salts Impedance Spectroscopy Aluminum Films Az91d Steel Eis Electrodeposition Resistance
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WOS记录号	WOS:000272525800033
引用统计	被引频次：96[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/321006/32551
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. F. Zhang,W. Zhang,C. W. Yan,et al. Corrosion behaviors of Zn/Al-Mn alloy composite coatings deposited on magnesium alloy AZ31B (Mg-Al-Zn)[J]. Electrochimica Acta,2009,55(2):560-571.
APA	J. F. Zhang,W. Zhang,C. W. Yan,K. Q. Du,&F. H. Wang.(2009).Corrosion behaviors of Zn/Al-Mn alloy composite coatings deposited on magnesium alloy AZ31B (Mg-Al-Zn).Electrochimica Acta,55(2),560-571.
MLA	J. F. Zhang,et al."Corrosion behaviors of Zn/Al-Mn alloy composite coatings deposited on magnesium alloy AZ31B (Mg-Al-Zn)".Electrochimica Acta 55.2(2009):560-571.