Pitting corrosion of a Rare Earth Mg alloy GW93
文献类型：期刊论文
| 作者 | 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
 |
| 出版日期 | 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 |
| 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. |
入库方式： OAI收割
来源：金属研究所
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