Effect of Fluoride-Silicate Ratio on Microstructures and Corrosion Resistance of Micro-arc Oxidation Coatings on AM60B Magnesium Alloys

	Effect of Fluoride-Silicate Ratio on Microstructures and Corrosion Resistance of Micro-arc Oxidation Coatings on AM60B Magnesium Alloys
	Wu Xiongfei; Ma Ying; Sun Le; An Lingyun; Wang Zhanying
刊名	RARE METAL MATERIALS AND ENGINEERING
	2021-05
卷号	50 期号:5 页码:1713-1719
关键词	magnesium alloys micro-arc oxidation fluoride-silicate ratio microstructure corrosion resistance
ISSN号	1002-185X
英文摘要	AM60B magnesium alloys were processed in sodium silicate based electrolytes by micro-arc oxidation (MAO), and the influence of the concentration ratio of potassium fluoride to sodium silicate (in short as fluoride-silicate ratio) on the microstructure and corrosion resistance of the coatings was quantitatively analyzed with changing the concentrations of KF and Na2SiO3 in electrolytes. The results show that the main salt Na2SiO3 is essential in the film-forming reaction. When the coatings are treated in the electrolyte with potassium fluoride (fluoride-silicate ratio is greater than zero), the film-forming reaction is intensified with the increasing of fluoride-silicate ratio, which causes the coatings owning more surface porosity, more number of large pore (> 3 mu m), and larger thickness. And newly formed MgF2 and more Mg2SiO4 in the coatings because of the existence of KF in the electrolyte will contribute to the improvement of the coatings' anti-corrosion ability. In addition, the competitive and synergistic effect of KF and Na2SiO3 in the electrolyte will vary with the changing of fluoride-silicate ratio, thus affecting the microstructure, phase content. ; and even the corrosion resistance of the coatings. In the present paper, the best fluoride-silicate ratio is 0.5 (KF:Na2SiO3 = 7.5:15), since the resulting coating has shown a larger thickness, better density and fewer defects due to the good synergism between KF and Na2SiO3. That is to say, both large thickness and excellent corrosion resistance of the coating has been obtained at this point.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
WOS记录号	WOS:000662931100030
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148675]
专题	材料科学与工程学院
作者单位	Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Wu Xiongfei,Ma Ying,Sun Le,et al. Effect of Fluoride-Silicate Ratio on Microstructures and Corrosion Resistance of Micro-arc Oxidation Coatings on AM60B Magnesium Alloys[J]. RARE METAL MATERIALS AND ENGINEERING,2021,50(5):1713-1719.
APA	Wu Xiongfei,Ma Ying,Sun Le,An Lingyun,&Wang Zhanying.(2021).Effect of Fluoride-Silicate Ratio on Microstructures and Corrosion Resistance of Micro-arc Oxidation Coatings on AM60B Magnesium Alloys.RARE METAL MATERIALS AND ENGINEERING,50(5),1713-1719.
MLA	Wu Xiongfei,et al."Effect of Fluoride-Silicate Ratio on Microstructures and Corrosion Resistance of Micro-arc Oxidation Coatings on AM60B Magnesium Alloys".RARE METAL MATERIALS AND ENGINEERING 50.5(2021):1713-1719.