镁合金点蚀的研究进展

doi:10.11902/1005.4537.2017.120

中国腐蚀与防护学报

2018, Vol. 38

Issue (4): 317-325 DOI: 10.11902/1005.4537.2017.120

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镁合金点蚀的研究进展

樊志民¹, 于锦¹, 宋影伟²(

), 单大勇², 韩恩厚²

1 沈阳工业大学理学院沈阳 110870
2 中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳 110016

Research Progress of Pitting Corrosion of Magnesium Alloys

Zhimin FAN¹, Jin YU¹, Yingwei SONG²(

), Dayong SHAN², En-Hou HAN²

1 School of Science, Shenyang University of Technology, Shenyang 110870, China
2 Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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摘要:

总结了国内外针对镁合金点蚀的最新研究成果,特别是腐蚀环境和微观结构对镁合金点蚀的萌生和发展的影响规律;介绍了新型微区原位技术在镁合金点蚀研究上的应用,并指出将微区原位技术与传统腐蚀研究方法相结合是揭示镁合金点蚀机理的重要手段。同时,提出了可减缓镁合金点蚀的方法。最后,对未来镁合金点蚀的研究重点和方向进行了分析和展望,以期对解决镁合金点蚀问题起到一定的指导意义。

关键词 ：点蚀, 镁合金, 腐蚀环境, 微观结构, 微区原位技术

Abstract：

Magnesium alloys, as the lightest structural metallic material, have great potential for applications in transportation、electronic and aerospace industries. However, the poor corrosion resistance extremely limits their utilization. Pitting corrosion is the most common localized corrosion form, which is a kind of hidden danger and frequently causes damage to structural parts of Mg-alloys. The effect of corrosive environment and microstructure of alloys on the initiation and propagation of pitting corrosion are summarized based on the recent research progress at home and abroad while the in situ techniques of micro area measurement for pitting corrosion research are introduced. It follows that the combination of in situ techniques and traditional corrosion research methods is the most efficient approach to reveal the pitting corrosion behavior of Mg-alloys. Meantime, the possible methods for declining the pitting corrosion of Mg-alloys are suggested. Eventually, the research focus of pitting corrosion of Mg-alloys in the future is analyzed and forecasted, expecting to give some advices to improve the pitting corrosion-resistant of Mg-alloys.

Key words： pitting corrosion magnesium alloy corrosion environment microstructure in situ local technique

收稿日期: 2017-07-23

ZTFLH:

TG174

基金资助:国家自然科学基金 (51471174) 和国家重点研发计划课题 (2016YFB0301105)

作者简介:

作者简介樊志民,男,1992年生,硕士生

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引用本文:

樊志民, 于锦, 宋影伟, 单大勇, 韩恩厚. 镁合金点蚀的研究进展[J]. 中国腐蚀与防护学报, 2018, 38(4): 317-325.
Zhimin FAN, Jin YU, Yingwei SONG, Dayong SHAN, En-Hou HAN. Research Progress of Pitting Corrosion of Magnesium Alloys. Journal of Chinese Society for Corrosion and protection, 2018, 38(4): 317-325.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.120 或 https://www.jcscp.org/CN/Y2018/V38/I4/317

图1 AM60点蚀机理模型示意图[14]

图2 AZ31B 浸泡在0.05 mol/L NaCl溶液中4 h后的光学显微照片和SVET测试局部电流密度分布[16]

图3 ZE41A-T5浸泡在0.001 mol/L NaCl溶液中18 h后的截面光学显微照片[23]

图4 AM30分别在盐雾和浸泡两种环境中腐蚀60 h后表面出现的不同尺寸的点蚀坑形貌 [26]

图5 Mg-3Zn分别浸泡在0.01 mol/L NaCl+0.01 mol/L Na2SO4,0.01 mol/L NaCl+0.05 mol/L Na2SO4及0.01 mol/L NaCl+0.1 mol/L Na2SO4溶液中6,12和16 h后的腐蚀形貌[28]

图6 AZ63镁合金浸泡在不同Cl-浓度和pH值的NaCl溶液中的电化学腐蚀行为[31]

图7 Mg-Zn-Y-Zr镁合金浸泡在0.1 mol/L NaCl溶液中10 min后的表面形貌

图8 Mg-Zn-Y-Zr镁合金浸泡在0.1 mol/L NaCl溶液中24 h后的表面二次电子像和背散射电子像[34]

图9 GW93合金浸泡在3.5%NaCl溶液中48 h后清除腐蚀产物的微观形貌[43]

图10 EW75合金在3.5%NaCl溶液中浸泡30 min未清除腐蚀产物和浸泡2 h并清除腐蚀产物后的截面形貌[44]

图11 不同Nd含量的AM60镁合金在3.5%NaCl溶液中浸泡48 h后失重检测后的表面形貌[48]

图12 铸态Mg-4Zn合金在3.5%NaCl溶液中浸泡4 h后的SEM像[49]

图13 固溶态Mg-4Zn合金在3.5%NaCl溶液中浸泡4 h的SEM像[49]

图14 自封孔微弧氧化膜及浸泡在3.5%NaCl溶液中330h后的宏观照片[54]

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