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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.
2017-09-01
Source PublicationJOURNAL MATER SCI TECHNOL
ISSN1005-0302
Volume33Issue:9Pages:954-960
AbstractPitting 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.
description.department[song, yingwei ; shan, dayong ; han, en-hou] chinese acad sci, inst met res, lab nucl mat & safety assessment, shenyang 110016, liaoning, peoples r china
KeywordMg Alloys Pitting Corrosion Second Phases Oxide Films
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51471174]; National Key Basic Research Program of China [2013CB632205]; National Key Research and Development Program of China [2016 YFB0301105]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79116
Collection中国科学院金属研究所
Corresponding AuthorSong, YW (reprint author), Chinese Acad Sci, Inst Met Res, Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
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.
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