Compactness of micro-arc oxidation coatings on AZ91D magnesium alloys and its effect on coating corrosion resistance

	Compactness of micro-arc oxidation coatings on AZ91D magnesium alloys and its effect on coating corrosion resistance
	Dong, Hai-Rong; Ma, Ying; Guo, Hui-Xia; Zhang, Yu-Fu; Hao, Yuan
刊名	Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
	2015-04-01
卷号	25 期号:4 页码:844-851
关键词	Corrosion resistance Electrolytes Magnesium alloys Oxidation Porosity Silicates Surface defects AZ91D magnesium alloys Calculation formula Compactness Micro-arc oxidation coatings Microarc oxidation Micropores Size and shape Surface porosity
ISSN号	10040609
英文摘要	The coatings on AZ91D magnesium alloys were prepared by micro-arc oxidation (MAO) in silicate-containing electrolyte. The method to research the compactness of the coatings was discussed and a calculation formula of the density of the coatings was deduced. Meanwhile, the size and amount of the micro pores on the surface and the surface porosity of the coatings treated for different times were analyzed quantitatively. And the effect of the above factors on the corrosion resistance of the coatings was researched. The results show that, the phase composition of the coatings has no change with the extension of treatment time, so, the compactness of the coatings can be researched indirectly through the density of the coatings. With prolonging treatment time, the micro pores on the surface of the coatings become bigger constantly. The differences in size and shape of the micro pores also become more serious. The surface porosities of the coatings gradually increase from 8% to 15%. After treating for 5 and 10 min, the compactness of the coatings is large, however, after treating for 20 min, the compactness decreases greatly and basically remains unchanged. The corrosion resistance of the sample treated for 30 min is the best, because the coatings has a larger thickness, higher compactness and less surface defects on the surface. ©, 2015, Central South University of Technology. All right reserved.
语种	中文
出版者	Central South University of Technology
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112344]
专题	材料科学与工程学院
作者单位	State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Dong, Hai-Rong,Ma, Ying,Guo, Hui-Xia,et al. Compactness of micro-arc oxidation coatings on AZ91D magnesium alloys and its effect on coating corrosion resistance[J]. Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals,2015,25(4):844-851.
APA	Dong, Hai-Rong,Ma, Ying,Guo, Hui-Xia,Zhang, Yu-Fu,&Hao, Yuan.(2015).Compactness of micro-arc oxidation coatings on AZ91D magnesium alloys and its effect on coating corrosion resistance.Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals,25(4),844-851.
MLA	Dong, Hai-Rong,et al."Compactness of micro-arc oxidation coatings on AZ91D magnesium alloys and its effect on coating corrosion resistance".Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals 25.4(2015):844-851.