铸态与挤压态Mg-5Y-7Gd-1Nd-0.5Zr合金在5% NaCl水溶液中的腐蚀行为

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Bibliographic Details
Published in中国有色金属学报：英文版 Vol. 22; no. 5; pp. 1018 - 1027
Main Author 张新 张奎 李兴刚 邓霞 李宏伟 张宝东 王长顺
Format Journal Article
LanguageEnglish
Published 2012
Subjects
Mg-5Y-7Gd-1Nd-0.5Zr镁合金
极化曲线
腐蚀形貌
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Bibliography:43-1239/TG
ZHANG Xin, ZHANG Kui, LI Xing-gang, DENG Xia, LI Hong-wei, ZHANG Bao-dong, WANG Chang-shun（ 1. State Key Laboratory for Fabrication and Processing of Nonferrous Metals, Beijing General Research Institute for Non-ferrous Metals, Beijing 100088, China; 2. Institute of Technology, Beijing North Vehicle Group Corporation, Beijing 100072, China; 3. Beijing Engineering Research Center for Advanced Manufacturing and Evaluation of Special Vehicle Parts, Beijing 100072, China ）
Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloy; corrosion morphology; polarization curve
The corrosion behaviours of Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloys prepared by as-casting and extrusion were investigated in 5% NaCl aqueous solution by immersion and electrochemical tests. The microstructure indicates the mean grain size of 15 μm for the extruded and 100 μm for the as-cast Mg-5Y-7Gd-1Nd-0.5Zr magnesium alloys. The corrosion morphology of as-cast sample shows pitting corrosion and little filiform corrosion, but that of the extruded sample shows pitting corrosion at the initial stage. The corrosion rate of extruded sample is higher than that of as-cast Mg-5Y-7Gd-1Nd-0.5Zr alloy according to the immersion test. The second phases containing RE acting as cathodes improve the corrosion properties. The corrosion potentials of as-cast and extruded Mg-5Y-7Gd-1Nd-0.5Zr alloys are -1.658 V and -1.591 V, respectively. The origins of the distinctive corrosion behavior of as-cast and extruded Mg-5Y-7Gd-1Nd-0.5Zr Mg alloys were discussed.
ISSN:1003-6326