铸态和锻造态Mg-5Y-7Gd-1Nd-0.5Zr合金腐蚀行为对比研究

doi:10.11900/0412.1961.2017.00484

金属学报

2018, Vol. 54

Issue (8): 1141-1149 DOI: 10.11900/0412.1961.2017.00484

本期目录 | 过刊浏览

铸态和锻造态Mg-5Y-7Gd-1Nd-0.5Zr合金腐蚀行为对比研究

刘金辉^1,², 宋影伟¹(

), 单大勇¹, 韩恩厚¹

1 中国科学院金属研究所核用材料与安全评价重点实验室沈阳 110016
2 东北大学材料科学与工程学院沈阳 110819

Comparative Study on Corrosion Behavior of Cast and Forged Mg-5Y-7Gd-1Nd-0.5Zr Alloys

Jinhui LIU^1,², Yingwei SONG¹(

), Dayong SHAN¹, En-Hou HAN¹

1 Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

引用本文:

刘金辉, 宋影伟, 单大勇, 韩恩厚. 铸态和锻造态Mg-5Y-7Gd-1Nd-0.5Zr合金腐蚀行为对比研究[J]. 金属学报, 2018, 54(8): 1141-1149.
Jinhui LIU, Yingwei SONG, Dayong SHAN, En-Hou HAN. Comparative Study on Corrosion Behavior of Cast and Forged Mg-5Y-7Gd-1Nd-0.5Zr Alloys[J]. Acta Metall Sin, 2018, 54(8): 1141-1149.

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摘要:

采用SEM、XRD和EDS等手段观察对比了铸态和锻造态稀土镁合金Mg-5Y-7Gd-1Nd-0.5Zr (EW75)的显微组织,分析了2种状态合金中的相组成及第二相的化学成分,采用腐蚀形貌观察、失重率和电化学测试对比了2个样品的耐蚀性。结果表明,铸态EW75合金中晶粒较大,大尺寸的骨骼状第二相沿晶界分布;锻造态EW75合金中晶粒较小,细小的颗粒状第二相弥散分布在晶界上。与铸态EW75合金相比,锻造态EW75合金中的微电偶腐蚀较弱,表面膜更均匀致密,耐蚀性更好。

关键词 ：镁合金, 铸态, 锻造态, 第二相, 表面膜, 微电偶腐蚀

Abstract：

Magnesium and its alloys have become increasingly attractive in the automotive, 3C products and aerospace industries because of their advantages such as low density and high specific strength. In recent years, rare earth-Mg alloys have attracted much attention due to their high mechanical properties at room and elevated temperatures. Adjusting the microstructures by deformation treatment is a common method to improve the mechanical properties of Mg alloys. The microstructure especially the size, volume fraction and distribution of second phases in rare earth-Mg alloys will be changed during deformation treatment, which has a great effect on the corrosion resistance of Mg alloys. However, the studies on the effect of deformation treatment on the corrosion resistance of rare earth-Mg alloys are far away from sufficient. In this work, the corrosion behavior of cast and forged Mg-5Y-7Gd-1Nd-0.5Zr (EW75) alloys were studied by using SEM, XRD, mass loss measurements and electrochemical tests. The results indicate that the second phases are distributed along the grain boundaries of cast and forged EW75 alloys. Meanwhile, the second phases in forged EW75 alloy are finer and lower volume fraction than that in cast EW75 alloy. The micro-galvanic corrosion of the forged EW75 alloy is weaker in comparison with the cast EW75 alloy owing to the smaller size and lower volume fraction of second phases as well more compact surface film, resulting in the better corrosion resistance.

Key words： Mg alloy cast forged second phase surface film micro-galvanic corrosion

收稿日期: 2017-11-20

ZTFLH:

O646

基金资助:国家重点研发计划项目No.2016YFB0301105和国家自然科学基金项目No.51471174

作者简介:

作者简介刘金辉,男,1991年生,博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00484 或 https://www.ams.org.cn/CN/Y2018/V54/I8/1141

图1 铸态和锻造态EW75合金表面微观形貌

图2 图1中γ和β相的EDS谱

图3 铸态和锻造态EW75合金蚀刻后表面形貌

图4 铸态和锻造态EW75合金的XRD谱

图5 铸态和锻造态EW75合金在3.5%NaCl溶液中分别浸泡60 h和7 d后的表面微观形貌

图6 铸态EW75合金在3.5%NaCl溶液中浸泡不同时间并清除腐蚀产物后的微观形貌

图7 锻造态EW75合金在3.5%NaCl溶液中浸泡不同时间并清除腐蚀产物后的表面微观形貌

图8 铸态和锻造态EW75合金在3.5%NaCl溶液中的动电位极化测试结果

表1 EW75合金极化曲线的拟合结果

图9 铸态和锻造态EW75合金在3.5%NaCl溶液中的EIS及拟合电路

表2 EIS拟合结果

图10 铸态和锻造态EW75合金在3.5%NaCl溶液中浸泡前后微电偶腐蚀截面示意图

图11 铸态和锻造态EW75合金在3.5%NaCl溶液中浸泡前后表面膜的形成截面示意图

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