Destruction Mechanism of Sustained Arc on Magnesium Alloy Coated by MAO

	Destruction Mechanism of Sustained Arc on Magnesium Alloy Coated by MAO
	Wang, Sheng 1,2; Ma, Ying 1,2; Song, Chengdi 1; Li, Bin 1,2; Hao, Yuan 1,2
刊名	Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
	2020-06-01
卷号	49 期号:6 页码:1970-1976
关键词	Capacitance Coatings High speed cameras Liquid metals Magnesium alloys Metals Oxidation Capacitance characteristics Cross-section morphology Different treatments Discharge phenomena Electrical parameter Element distribution Reciprocating process Thermal transmission
ISSN号	1002185X
英文摘要	In order to avoid the destruction of the film by sustained arc discharge during micro-arc oxidation (MAO), the essence of sustained arc discharge was explored through capturing the discharge phenomenon by a high-speed camera combined with the current and voltage wave form of the load. And then the change of surface and cross-section morphology and the phase composition of the destroyed area were investigated compared with those of the normal coating. Finally, different matches between duty ratio and frequency were used to explore the influence of the electrical parameters on the sustained arc discharge phenomenon. The results show that the surface of the sample exhibits a reciprocating process of arc burning, arc quenching and cooling during micro-arc oxidation. The localized destroyed area of the coating shows a sustained arc discharge phenomenon. The composition, surface, cross-section morphology and element distribution of the local sustained arc discharge region are very different from those of the normal micro-arc oxidation film layer. And the uniformity, compactness and integrity of the film layer is destroyed, which lead to the destruction of the overall uniformity of the film layer, and even cause serious damage to the external size of the sample. The capacitance characteristic of the load causes the arc duration time to be too long while the cooling time of the molten metal oxide is insufficient; the local thermal transmission is insufficient and the heat is concentrated, which is the basic reason of the sustained arc destruction. This destruction cannot be repaired after it occurs; however, it is possible to avoid the occurrence of sustained arc destruction under different treatment voltages by reasonable matching between frequency and the duty ratio. © 2020, Science Press. All right reserved.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	中文
出版者	Rare Metals Materials and Engineering Press
WOS记录号	WOS:000552452000020
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115401]
专题	材料科学与工程学院
作者单位	1.Lanzhou University of Technology, Lanzhou; 730050, China 2.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Wang, Sheng,Ma, Ying,Song, Chengdi,et al. Destruction Mechanism of Sustained Arc on Magnesium Alloy Coated by MAO[J]. Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering,2020,49(6):1970-1976.
APA	Wang, Sheng,Ma, Ying,Song, Chengdi,Li, Bin,&Hao, Yuan.(2020).Destruction Mechanism of Sustained Arc on Magnesium Alloy Coated by MAO.Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering,49(6),1970-1976.
MLA	Wang, Sheng,et al."Destruction Mechanism of Sustained Arc on Magnesium Alloy Coated by MAO".Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering 49.6(2020):1970-1976.