期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 33, 期 9, 页码 954-960出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2017.01.014
关键词
Mg alloys; Pitting corrosion; Second phases; Oxide films
资金
- 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]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据