Electrochemical corrosion behavior of composite coatings of sealed MAO film on magnesium alloy AZ91D

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	Electrochemical corrosion behavior of composite coatings of sealed MAO film on magnesium alloy AZ91D
	H. P. Duan; K. Q. Du; C. W. Yan; F. H. Wang
	2006
发表期刊	Electrochimica Acta
ISSN	0013-4686
卷号	51 期号:14 页码:2898-2908
摘要	Protective composite coatings were prepared on magnesium alloy AZ91D by micro-arc oxidation (MAO) treatment plus a top coating with sealing agent using multi-immersion technique under low-pressure conditions. The corrosion resistance of AZ91D alloy with composite coatings was superior evidently to that with merely MAO film. SEM observations revealed that the sealing agent was integrated with MAO film by physically interlocking; therewith covered uniformly the surface as well as penetrated into pores and rnicro-cracks of MAO film. The anti-corrosion properties in 3.5% NaCl solution of the composite coatings were evaluated by using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. Based on the results of chronopotentiometric (E similar to t) and EIS measurements for long time immersion in 3.5% NaCl solution, appropriate equivalent circuits for the composite coatings system were proposed. It follows that due to the blocking effect of the sealing agent in pores and cracks in MAO film, the composite coatings can suppress the corrosion process by holding back the transfer or diffusion of electrolyte and corrosion products between the composite coatings and solution during immersion. (c) 2005 Elsevier Ltd. All rights reserved.
部门归属	chinese acad sci, met res inst, state key lab corros & protect, shenyang 110016, peoples r china. chinese acad sci, grad sch, beijing 100049, peoples r china. dalian jiaotong univ, coll environm sci & engn, dalian 116028, peoples r china.;yan, cw (reprint author), chinese acad sci, met res inst, state key lab corros & protect, 62 wencui rd, shenyang 110016, peoples r china;hpduan@imr.ac.cn
关键词	Composite Coatings Mao Film Sealing Magnesium Alloy Az91d Eis Micro-arc Oxidation Impedance Spectroscopy Interfacial Factors Phosphate Coatings Alkaline-solutions Aluminum-alloys Nacl Solution Anodic Films Mg Alloys Part 2
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WOS记录号	WOS:000236478800013
引用统计	被引频次：420[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/321006/34188
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. P. Duan,K. Q. Du,C. W. Yan,et al. Electrochemical corrosion behavior of composite coatings of sealed MAO film on magnesium alloy AZ91D[J]. Electrochimica Acta,2006,51(14):2898-2908.
APA	H. P. Duan,K. Q. Du,C. W. Yan,&F. H. Wang.(2006).Electrochemical corrosion behavior of composite coatings of sealed MAO film on magnesium alloy AZ91D.Electrochimica Acta,51(14),2898-2908.
MLA	H. P. Duan,et al."Electrochemical corrosion behavior of composite coatings of sealed MAO film on magnesium alloy AZ91D".Electrochimica Acta 51.14(2006):2898-2908.