Effect of Potassium Fluoride on Growth and Microstructure of MAO Coatings on AZ91D Magnesium Alloys

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	Effect of Potassium Fluoride on Growth and Microstructure of MAO Coatings on AZ91D Magnesium Alloys
	Dong Hairong; Ma Ying; Wang Sheng; An Lingyun; Hao Yuan
刊名	RARE METAL MATERIALS AND ENGINEERING
	2018-01
卷号	47 期号:1 页码:249-254
关键词	AZ91D magnesium alloy micro arc oxidation potassium fluoride growth microstructure
ISSN号	1002-185X
英文摘要	AZ91D magnesium alloys were processed in the base electrolytes composed with sodium hydroxide and sodium silicate, not containing or containing potassium fluoride, by micro arc oxidation (MAO). Influence of potassium fluoride on growth, microstructure and corrosion resistance of the coatings was investigated. The results show that after potassium fluoride is added to the base electrolyte, the breakdown voltage of the specimen decreases but the breakdown process is more vigorous to form larger sparks on the specimen surface during micro arc oxidation. As a result, the growth rate of the coating significantly increases and the obtained coating has a remarkable improvement in terms of coating thickness. Meanwhile, the surface porosity of the coating somewhat increases but the amount of the micro-pores on the coating surface decreases. The addition of potassium fluoride into the electrolyte is helpful for the formation of MgF2 and MgAl2O4 phases of the coating. Compared with silicate and oxygen elements from the electrolyte, F- ion is more likely to be absorbed by magnesium in the substrate and also easily overcomes the obstacle of the generated coating to migrate into the inner of the coating. The corrosion resistance of the coating treated in the electrolyte with potassium fluoride is increased under the influence of significant increasing in coating thickness and the existence of favorable phases such as newly formed MgF2 and more MgAl2O4.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	中文
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
WOS记录号	WOS:000429187800044
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/36030]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
通讯作者	Ma Ying
作者单位	Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Dong Hairong,Ma Ying,Wang Sheng,et al. Effect of Potassium Fluoride on Growth and Microstructure of MAO Coatings on AZ91D Magnesium Alloys[J]. RARE METAL MATERIALS AND ENGINEERING,2018,47(1):249-254.
APA	Dong Hairong,Ma Ying,Wang Sheng,An Lingyun,&Hao Yuan.(2018).Effect of Potassium Fluoride on Growth and Microstructure of MAO Coatings on AZ91D Magnesium Alloys.RARE METAL MATERIALS AND ENGINEERING,47(1),249-254.
MLA	Dong Hairong,et al."Effect of Potassium Fluoride on Growth and Microstructure of MAO Coatings on AZ91D Magnesium Alloys".RARE METAL MATERIALS AND ENGINEERING 47.1(2018):249-254.