Electrochemical Corrosion Behavior of AZ91D Magnesium Alloy under Thin Electrolyte Layer Containing SO2
摘 要
利用自建厚度可控的大气腐蚀薄液膜电化学测试装置, 通过分析极化曲线以及交流阻抗谱探讨了AZ91D镁合金在含SO2薄液膜下的腐蚀电化学行为, 并观察了镁合金在薄液膜下的腐蚀形貌。结果表明: 薄液膜厚度和SO2对镁合金阴、阳极化率都有影响; SO2的存在使阴、阳极化率降低, 加速镁合金在薄液膜下的腐蚀; 随着薄液膜的减薄, 腐蚀加速, 50 μm下出现最大值, 但在极薄液膜下腐蚀产物的形成阻碍O2的扩散, 腐蚀减缓; 极限扩散电流密度随薄液膜厚度的增大先增加后减小, 薄液膜厚度小于50 μm时, 腐蚀产物的堆积使阳极过程受到抑制; 镁合金在SO2薄液膜下的阻抗谱由一个高频容抗弧和一个低频扩散阻抗组成, 表现为两个时间常数; 在不同厚度SO2薄液膜下腐蚀倾向从大到小的顺序为50, 20, 200, 300 μm。
Abstract
The self-built electrochemical measurement device for atmospheric corrosion, with a thin electrolyte layer thickness controlling set was utilized to investigate the electrochemical corrosion behavior of AZ91D magnesium alloy under thin electrolyte layer containing SO2 by means of polarization curve and electrochemical impedance spectrum. Furthermore the corrosion morphology was observed. Results show both the thickness of thin electrolyte layer and SO2 affected the anodic/cathodic polarization slope. SO2 addition reduced anodic/cathodic polarization slope, indicating the acceleration of corrosion for magnesium alloy. With the decrease of the thickness of thin electrolyte layer, the corrosion rate increased. The maximum value was found in 50 μm thickness. The formation of corrosion products under electrolyte layer with very thin thickness blocked the oxygen diffusion, leading to the slowing down of corrosion. The limited diffusion current density firstly increased and then decreased with the increase in the thickness of thin electrolyte layer. When the thickness of electrolyte layer was less than 50 μm, anodic process was inhibited because of pileup of corrosion products. The Nyquist curve consisted of high frequency capacity reactance arc and low frequency diffusion impedance, and showed two time constants. The order of corrosion tendency under electrolyte layer containing SO2 in different thickness was 50, 20, 200, 300 μm.
中图分类号 TG172.3
所属栏目 材料性能及其应用
基金项目 国家自然科学基金资助项目(50601012); 江西省自然科学基金资助项目(2009GQC0110)
收稿日期 2012/5/21
修改稿日期 2013/3/28
网络出版日期
作者单位点击查看
备注林翠(1976—), 女, 广东蕉岭人, 教授, 博士。
引用该论文: LIN Cui,XIAO Zhi-yang,LIANG Jian-neng. Electrochemical Corrosion Behavior of AZ91D Magnesium Alloy under Thin Electrolyte Layer Containing SO2[J]. Materials for mechancial engineering, 2013, 37(6): 55~60
林翠,肖志阳,梁健能. AZ91D镁合金在SO2薄液膜下的电化学腐蚀行为[J]. 机械工程材料, 2013, 37(6): 55~60
被引情况:
【1】高继峰,刘德绪,龚金海,王勇, "磷酸一氢钠对AZ91镁合金的缓蚀作用",腐蚀与防护 35, 233-238(2014)
【2】张鹏,马金福,王飞, "交流电流作用下X80钢在碱性溶液中阴极保护准则的适用性能",腐蚀与防护 35, 175-178(2014)
【3】吉先武,邓承佯,熊懿,吴根林,张伟, "飞机铸造镁合金件螺栓孔的开裂原因",腐蚀与防护 37, 171-174(2016)
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参考文献
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【19】林翠, 李晓刚.AZ91D镁合金在SO2大气环境中的初期腐蚀行为[J].中国有色金属学报, 2004, 14(10): 1658-1665.
【20】邓祖宇, 廖钫, 何晓英.NaCl薄层液膜下X70钢腐蚀的电化学研究[J].西华师范大学学报, 2008, 29(1): 89-92.
【2】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(3): 1245-1265.
【3】LINDSTROM R, JOHANSSON L G, THOMPSON G E, et al. Corrosion of magnesium in humid air[J].Corrosion Science, 2004, 46(5): 1141-1158.
【4】JOHANSSON M, PERSSON D, LEYGRAF C. Atmospheric corrosion of field-exposed magnesium alloy AZ91D[J].Corrosion Science, 2008, 50(5): 1406-1413.
【5】LIN C, LI X G. Roles of CO2 in the Initial stage of atmospheric corrosion of AZ91 magnesium alloy in the present of NaCl[J].Rare Metals, 2006, 25(2): 190-196.
【6】汪俊, 韩薇, 李洪锡, 等. 大气腐蚀电化学研究方法现状[J].腐蚀科学与防护技术, 2002, 14(6): 333-336.
【7】WALL F D, MARTINEZ M A, MISSERT N A, et al. Characterizing corrosion behavior under atmospheric conditions using electrochemical techniques[J].Corrosion Science, 2005, 47(1): 17-32.
【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(5): 1193-1208.
【9】李明齐, 蔡铎昌, 何晓英.H2S薄层液膜下16Mn钢腐蚀的电化学研究[J].材料保护, 2006, 39(1): 1-5.
【10】李明齐, 何晓英, 蔡铎昌.薄层液膜下金属电化学腐蚀电池的设计[J].腐蚀科学与防护技术, 2005, 17(5): 355-357.
【11】何晓英, 邓祖宇, 邓海英.(NH4)2SO4薄层液膜下X70钢腐蚀的电化学研究[J].腐蚀科学与防护技术, 2008, 20(3): 213-215.
【12】周和荣, 李晓刚, 董超芳.7A04铝合金在薄液膜下腐蚀行为[J].北京科技大学学报, 2008, 30(8): 880-887.
【13】EL-MAHDY G A, NISHIKATA A, TSURU T. AC impedance study on corrosion of 55%Al-Zn alloy-coated steel under thin electrolyte layers[J].Corrosion Science, 2000, 42(9): 1509-1521.
【14】CHENG Y L, ZHANG Z, CAO F H, et al. A study of the corrosion of aluminum alloy 2024-T3 under thin electrolyte layers[J].Corrosion Science, 2004, 46(7): 1649-1667.
【15】陈崇木, 崔宇, 张涛.电化学方法研究纯镁在薄液膜下的腐蚀行为I-O2对纯镁在薄液膜下的腐蚀行为的影响[J].腐蚀科学与防护技术, 2009, 21(2): 94-96.
【16】陈崇木, 张涛, 邵亚薇.电化学方法研究纯镁在薄液膜下的腐蚀行为П―薄液膜对纯镁腐蚀阳极过程的影响[J].腐蚀科学与防护技术, 2009, 21(2): 97-100.
【17】林翠, 洪昕培.一种气体环境中薄液膜下金属腐蚀行为测试方法: 中国, CN101788454A[P].2010-07-28.
【18】林翠, 洪昕培.用于大气腐蚀测试的薄液膜控制装置: 中国, CN201477032U[P].2010-05-19.
【19】林翠, 李晓刚.AZ91D镁合金在SO2大气环境中的初期腐蚀行为[J].中国有色金属学报, 2004, 14(10): 1658-1665.
【20】邓祖宇, 廖钫, 何晓英.NaCl薄层液膜下X70钢腐蚀的电化学研究[J].西华师范大学学报, 2008, 29(1): 89-92.
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