Plasma electrolytic oxidation of AZ91D magnesium alloy with different additives and its corrosion behavior

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	Plasma electrolytic oxidation of AZ91D magnesium alloy with different additives and its corrosion behavior
	F. H. Cao; J. L. Cao; Z. Zhang; J. Q. Zhang; C. N. Cao
	2007
发表期刊	Materials and Corrosion-Werkstoffe Und Korrosion
ISSN	0947-5117
卷号	58 期号:9 页码:676-683
摘要	Plasma electrolytic oxidation (PEO) of Mg-based AZ91D alloys was investigated using 50 Hz AC anodizing technique in an alkaline borate solution, which contained a new kind of organic additive and without F, P, and Cr. The anodizing technological parameters have been optimized and a kind of ivory-white smooth anodic film with high corrosion resistance was obtained. It was found that the formation of the anodic films was always coupled with sparking and oxygen evolution, whose intensity changed with the additive and anodizing voltage. All EIS plots have two capacitive loops and one low frequency inductive component. Two capacitive arcs present the barrier and porous layer of the PEO film and the inductive component in the low frequency domain is a complex behavior due to the porous structure connected to the electrolyte.EIS plots and fitting results show that a self-sealing process of the PEO firm with different additives takes place in the beginning of immersion time, then corrosion attack becomes a preponderant process to promote the degradation of the film. Tafel results show that PEO treatment decreases the corrosion current density by four, even five orders of magnitude, while additives content does not affect strongly the electrochemical corrosion behavior. Salt spray test shows that the PEO film formed with NaAlO2 and Na2SiO3 presents good corrosion resistance, over 600 h without any sealing treatment. The difference of corrosion resistance arose by additives examined by electrochemical techniques and salt spray test does not show strict corresponding relationship.
部门归属	zhejiang univ, dept chem, hangzhou 310027, peoples r china. chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china.;cao, fh (reprint author), zhejiang univ, dept chem, hangzhou 310027, peoples r china;nelson_cao@zju.edu.cn
关键词	Ac-impedance Measurements Oxide-films Aluminum Coatings
URL	查看原文
WOS记录号	WOS:000250149700004
引用统计	被引频次：45[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/321006/33431
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	F. H. Cao,J. L. Cao,Z. Zhang,et al. Plasma electrolytic oxidation of AZ91D magnesium alloy with different additives and its corrosion behavior[J]. Materials and Corrosion-Werkstoffe Und Korrosion,2007,58(9):676-683.
APA	F. H. Cao,J. L. Cao,Z. Zhang,J. Q. Zhang,&C. N. Cao.(2007).Plasma electrolytic oxidation of AZ91D magnesium alloy with different additives and its corrosion behavior.Materials and Corrosion-Werkstoffe Und Korrosion,58(9),676-683.
MLA	F. H. Cao,et al."Plasma electrolytic oxidation of AZ91D magnesium alloy with different additives and its corrosion behavior".Materials and Corrosion-Werkstoffe Und Korrosion 58.9(2007):676-683.