Polarization Behavior of Magnesium Alloy AZ91D with Micro-Arc Oxidation Coating in NaCl Solution

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	Polarization Behavior of Magnesium Alloy AZ91D with Micro-Arc Oxidation Coating in NaCl Solution
	L. R. Chang; F. H. Cao; J. S. Cai; W. J. Liu; J. J. Zheng; J. Q. Zhang; C. N. Cao
	2012
Source Publication	Acta Physico-Chimica Sinica
ISSN	1000-6818
Volume	28 Issue:1 Pages:127-136
Abstract	The polarization curves of magnesium alloy AZ91D with a micro-arc oxidation (MAO) coating showed several typical patterns caused by differences in the composition and structure of the coating. The pattern of the polarization curve of magnesium alloy AZ91D with a MAO coating depends on the primary composition and structure of the MAO coating and many experimental factors, such as the concentration of chloride ions, pH of the electrolyte, degree of cathodic polarization, and the exposed area of the specimen. These factors change the pattern of polarization curve of magnesium alloy AZ91D with MAO coating by affecting the main composition and structure of the MAO coating because of its instability in aqueous solution. Compositional and structural changes in the MAO coating on magnesium alloy AZ91D were investigated by Fourier transform infrared microscopic mapping and the corresponding optical photographs, respectively. A model was proposed to describe the transformation of the MAO coating in aqueous NaCl solution. For magnesium alloy AZ91D with a MAO coating immersed in NaCl solution, the rate determining steps of the anodic and cathodic reactions are the mass diffusion and charge transfer steps, respectively. As a result, the corrosion current density fitted from the polarization curve is not an accurate corrosion rate.
description.department	[chang lin-rong; cao fa-he; cai jing-shun; liu wen-juan; zheng jun-jun; zhang jian-qing; cao chu-nan] zhejiang univ, dept chem, hangzhou 310027, peoples r china. [zhang jian-qing; cao chu-nan] 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
Keyword	Az91d Micro-arc Oxidaton Coating Polarization Curve Fourier Transform Infrared Spectroscopy Microscopic Mapping Electrochemical Impedance Spectroscopy Plasma Electrolytic Oxidation Corrosion-resistance Electrochemical-behavior Peo Coatings Aqueous-solution Anodization Silicate Films Microstructure Performance
URL	查看原文
Document Type	期刊论文
Identifier	http://ir.imr.ac.cn/handle/321006/59894
Collection	中国科学院金属研究所
Recommended Citation GB/T 7714	L. R. Chang,F. H. Cao,J. S. Cai,et al. Polarization Behavior of Magnesium Alloy AZ91D with Micro-Arc Oxidation Coating in NaCl Solution[J]. Acta Physico-Chimica Sinica,2012,28(1):127-136.
APA	L. R. Chang.,F. H. Cao.,J. S. Cai.,W. J. Liu.,J. J. Zheng.,...&C. N. Cao.(2012).Polarization Behavior of Magnesium Alloy AZ91D with Micro-Arc Oxidation Coating in NaCl Solution.Acta Physico-Chimica Sinica,28(1),127-136.
MLA	L. R. Chang,et al."Polarization Behavior of Magnesium Alloy AZ91D with Micro-Arc Oxidation Coating in NaCl Solution".Acta Physico-Chimica Sinica 28.1(2012):127-136.

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