Effects of spark discharge on the anodic coatings on magnesium alloy

doi:10.1016/j.matlet.2005.09.015

	Effects of spark discharge on the anodic coatings on magnesium alloy
	Wang, YH ; Wang, J ; Zhang, JB ; Zhang, Z
	2006-02-01
发表期刊	MATERIALS LETTERS
ISSN	0167-577X
卷号	60 期号:4 页码:474-478
文章类型	Article
摘要	Spark discharge was the representative phenomenon of Micro-arc oxidation (MAO) method distinguished from other electrochemical oxidation methods. Under the spark discharge treatment, characteristics of the anodic layer were significantly changed. To investigate the influences of the spark discharge, a piece of magnesium alloy AZ91D specimen was partly treated by MAO method in alkaline silicate solution. And the microstructure, element distributions as well as the surface potential distributions of the specimen were studied by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and scanning Kelvin probe (SKP) technique. As a result of intensive spark discharge treatment, porous external layer with dense internal layer were formed on Mg alloy surface. At the same time, the depositions of OH- and SiO32- ions were accelerated, which resulted in the enrichment of element oxygen and silicon at the spark discharge region. Moreover, due to the compact internal layer, the intensive spark discharge region exhibited more positive potentials with respect to other regions, which meant this region could restrain the ejection of electron and provide effective protection to the substrate. In addition, it was found that oxygen played a vital role in determining the intensity and size of sparks, and abundant oxygen resulted in intensive and larger sparks. (c) 2005 Elsevier B.V. All rights reserved.; Spark discharge was the representative phenomenon of Micro-arc oxidation (MAO) method distinguished from other electrochemical oxidation methods. Under the spark discharge treatment, characteristics of the anodic layer were significantly changed. To investigate the influences of the spark discharge, a piece of magnesium alloy AZ91D specimen was partly treated by MAO method in alkaline silicate solution. And the microstructure, element distributions as well as the surface potential distributions of the specimen were studied by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and scanning Kelvin probe (SKP) technique. As a result of intensive spark discharge treatment, porous external layer with dense internal layer were formed on Mg alloy surface. At the same time, the depositions of OH- and SiO32- ions were accelerated, which resulted in the enrichment of element oxygen and silicon at the spark discharge region. Moreover, due to the compact internal layer, the intensive spark discharge region exhibited more positive potentials with respect to other regions, which meant this region could restrain the ejection of electron and provide effective protection to the substrate. In addition, it was found that oxygen played a vital role in determining the intensity and size of sparks, and abundant oxygen resulted in intensive and larger sparks. (c) 2005 Elsevier B.V. All rights reserved.
关键词	Spark Discharge Micro-arc Oxidation Magnesium Alloy Oxygen Element Distribution Surface Potential
学科领域	Materials Science, Multidisciplinary ; Physics, Applied
DOI	10.1016/j.matlet.2005.09.015
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000233881800011
引用统计	被引频次：41[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/5468
专题	海洋生态与环境科学重点实验室
作者单位	1.Ocean Univ China, Dept Chem & Chem Engn, Qingdao 266003, Peoples R China 2.State Key Lab Corros & Protect Met, Shenyang 110016, Peoples R China 3.Zhanjiang Ocean Univ, Zhanjiang 524088, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Wang, YH,Wang, J,Zhang, JB,et al. Effects of spark discharge on the anodic coatings on magnesium alloy[J]. MATERIALS LETTERS,2006,60(4):474-478.
APA	Wang, YH,Wang, J,Zhang, JB,&Zhang, Z.(2006).Effects of spark discharge on the anodic coatings on magnesium alloy.MATERIALS LETTERS,60(4),474-478.
MLA	Wang, YH,et al."Effects of spark discharge on the anodic coatings on magnesium alloy".MATERIALS LETTERS 60.4(2006):474-478.

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