Pitting corrosion of a Rare Earth Mg alloy GW93

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	Pitting corrosion of a Rare Earth Mg alloy GW93
	Song, Yingwei; Shan, Dayong; Han, En-Hou; Song, YW (reprint author), Chinese Acad Sci, Inst Met Res, Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China.
刊名	JOURNAL MATER SCI TECHNOL
	2017-09-01
卷号	33 期号:9 页码:954-960
关键词	Mg Alloys Pitting Corrosion Second Phases Oxide Films
ISSN号	1005-0302
英文摘要	Pitting corrosion of magnesium (Mg) alloys is greatly associated with their microstructure, especially second phases. The second phases in traditional Mg alloys such as AZ91 are electrochemically nobler than Mg matrix, while the second phases in Rare earth (RE) Mg alloy GW93 are more active than Mg matrix. As a result, the pitting corrosion mechanism of Mg alloy GW93 is different from the traditional ones. This paper aims to clarify the pitting corrosion mechanism of Mg alloy GW93 through the studies of Volta potential by Scanning Kelvin Probe Force Microscopy (SKPFM), corrosion morphology by Scanning Electron Microscope (SEM), and corrosion resistance by electrochemical tests. Results reveal that the pitting corrosion of GW93 includes three stages, first, dissolution of the second phases, followed by corrosion of Mg matrix adjacent to the dissolved second phases, and finally, propagation of corrosion pits along the depth direction of the dissolved second phases. Anodic second phases and enrichment of Cl in the thick corrosion product films dominate the propagation of pitting corrosion. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.; Pitting corrosion of magnesium (Mg) alloys is greatly associated with their microstructure, especially second phases. The second phases in traditional Mg alloys such as AZ91 are electrochemically nobler than Mg matrix, while the second phases in Rare earth (RE) Mg alloy GW93 are more active than Mg matrix. As a result, the pitting corrosion mechanism of Mg alloy GW93 is different from the traditional ones. This paper aims to clarify the pitting corrosion mechanism of Mg alloy GW93 through the studies of Volta potential by Scanning Kelvin Probe Force Microscopy (SKPFM), corrosion morphology by Scanning Electron Microscope (SEM), and corrosion resistance by electrochemical tests. Results reveal that the pitting corrosion of GW93 includes three stages, first, dissolution of the second phases, followed by corrosion of Mg matrix adjacent to the dissolved second phases, and finally, propagation of corrosion pits along the depth direction of the dissolved second phases. Anodic second phases and enrichment of Cl in the thick corrosion product films dominate the propagation of pitting corrosion. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
学科主题	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	National Natural Science Foundation of China [51471174]; National Key Basic Research Program of China [2013CB632205]; National Key Research and Development Program of China [2016 YFB0301105]
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79116]
专题	金属研究所_中国科学院金属研究所
通讯作者	Song, YW (reprint author), Chinese Acad Sci, Inst Met Res, Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Song, Yingwei,Shan, Dayong,Han, En-Hou,et al. Pitting corrosion of a Rare Earth Mg alloy GW93[J]. JOURNAL MATER SCI TECHNOL,2017,33(9):954-960.
APA	Song, Yingwei,Shan, Dayong,Han, En-Hou,&Song, YW .(2017).Pitting corrosion of a Rare Earth Mg alloy GW93.JOURNAL MATER SCI TECHNOL,33(9),954-960.
MLA	Song, Yingwei,et al."Pitting corrosion of a Rare Earth Mg alloy GW93".JOURNAL MATER SCI TECHNOL 33.9(2017):954-960.