AZ91D镁合金在模拟酸雨环境中的腐蚀行为
Corrosion Behavior of AZ91D Magnesium Alloy in Simulated Acid Rain Environment
摘 要
采用自建的模拟酸雨喷淋装置以及光学显微镜、三维数字显微镜、扫描电镜、X射线衍射仪等探讨了AZ91D镁合金在模拟酸雨环境中的腐蚀规律和机理。结果表明: 合金中α相受到严重的腐蚀, 而β相由于铝含量较高, 腐蚀较轻; 腐蚀区域可以划分为弱腐蚀区和强腐蚀区; 镁合金表面在腐蚀初期形成腐蚀坑, 主要由镁合金基体的溶解所产生, 随着腐蚀的进行, 针状产物覆盖在表面上, 蚀孔内部形成闭塞区域, 产生了闭塞电池自催化过程。
模拟酸雨
腐蚀
AZ91D magnesium alloy
simulated acid rain
corrosion
Abstract
The corrosion law and mechanism of AZ91D magnesium alloys were studied by means of optical microscopy, 3D digital microscopy, scanning electron microscopy, X-ray diffraction and self-made simulated acid rain spraying device. The results show that α phase in the alloy was severely corroded, β phase which contained high Al concentration was corroded slightly. The corrosion area could be divided into weak area and strong area. Pits were observed on the surface of the magnesium alloys at the initial period, which were caused by the dissolution of magnesium alloy matrix. As the corrosion going on, the surface was covered by the acicular products. Occluded area formed inside pits, which resulted in autocatalytic process.
中图分类号 TG172.3
所属栏目
基金项目 国家自然科学基金资助项目(50601012); 教育部科学技术研究重点项目(208068); 江西省高等学校重点实验室研究项目(GJJ08520)
收稿日期 2009/12/8
修改稿日期 2010/10/15
网络出版日期
作者单位点击查看
备注林翠(1976-), 女, 江西南昌人, 教授, 博士。
引用该论文: LIN Cui,LIANG Jian-neng,CHEN San-juan. Corrosion Behavior of AZ91D Magnesium Alloy in Simulated Acid Rain Environment[J]. Materials for mechancial engineering, 2011, 35(2): 78～81
林翠,梁健能,陈三娟. AZ91D镁合金在模拟酸雨环境中的腐蚀行为[J]. 机械工程材料, 2011, 35(2): 78～81
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参考文献
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【2】GHALI E. Corrosion and protection of magnesium alloys[J].Materials Science Forum, 2000, 350/351:261-272.
【3】LIN Cui, LI Xiao-gang. Initial corrosion of AZ91D magnesium alloy in atmosphere containing SO2[J].The Chinese Journal of Nonferrous Metals, 2004, 14(10):1658-1665.
【4】LINDSTROM R, JOHANSSON L. Corrosion of magnesium in humid air[J].Corrosion Science, 2004, 46:1141-1158.
【5】MAGAINO S, SOGA M, SOBUE K. Zinc corrosion in simulated acid rain[J].Electrochimica Acta, 1999, 44:4307-4312.
【6】安百刚, 张学元, 韩恩厚.Zn在模拟酸雨溶液中及其薄液膜下的腐蚀[J].金属学报, 2004, 40(2): 202-206.
【7】ZHONG Li-ying, CAO Fa-he, LIU Wen-juan, et al. Electrochemical impedance fractal study of AM60 magnesium alloy in aggressive solution[J].Journal of Materials Science and Engineering, 2009, 27(1):47-53.
【8】JOHANSSON M, THIERRY D, LEBOZEC N. The influence of microstructure on the corrosion behaviour of AZ91D studied by scanning kelvin probe force microscopy and scanning kelvin probe[J].Corrosion Science, 2006, 48:1193-1208.
【9】LINDSTROM R, SVENSSON J E, JOHANSSON L G. The influence of carbon dioxide on the atmospheric corrosion of some magnesium alloys in the presence of NaCl[J].Journal of the Electrochemical Society, 2002, 149(4):103-107.
【10】SONG G L, HAPUGODA S, JOHN D S. Degradation of the surface appearance of magnesium and its alloys in simulated atmospheric environments[J].Corrosion Science, 2007, 49:1245-1265.
【11】任伊宾, 黄晶晶, 杨柯.纯镁的生物腐蚀研究[J].金属学报, 2005, 41(11):1228-1232.
【12】胡婷婷, 向斌, 左秀丽.AZ91D镁合金在模拟酸雨溶液中的腐蚀行为[J].腐蚀与防护, 2009, 30(7): 477-479.
【13】石林, 易筱筠, 邹智毅.广州泌冲土壤中REE的模拟酸雨淋溶实验研究[J].华南理工大学学报: 自然科学版, 2003, 31(5): 56-58.
【14】王勇, 高家诚, 张艳.纯镁在模拟体液中的腐蚀机理[J].中国有色金属学报, 2007, 17(12): 1981-1986.
【15】AMBAT R, AUNG N N, ZHOU W. Studies on the influence of chloride ion and pH on the corrosion and electroche-mical behaviour of AZ91D magnesium alloy[J].Journal of Applied Electrochemistry, 2000, 30:865-874.
【16】LIN Wen-juan, CAO Fa-he, JIA Bing-li, et al. Corrosion behaviour of AM60 magnesium alloys containing Ce or La under thin electrolyte layers. Part2: Corrosion product and characterization[J].Corrosion Science, 2010, 52:639-650.
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