大气中SO2对金属银的电化学腐蚀行为
Electrochemical Behavior of SO2 Corrosion of Silver Electrode in Air Environment
摘 要
利用三电极电化学电池研究了大气环境中的SO2对金属银的腐蚀行为.通过电化学阻抗谱和极化曲线分析了金属银在不同厚度液膜、不同湿度、不同SO2气体浓度及不同暴露时间下的初期腐蚀行为.结果显示:电极表面液膜越薄,金属银的腐蚀电流密度越大；采用镜头纸控制银电极表面液膜厚度,随着大气环境湿度的增加,银的腐蚀速度减小；在自然大气环境中,随着大气中SO2浓度的增加,暴露时间的延长,银电极的阻抗值增大,这可能是由于银电极表面Ag2O、AgOH和亚硫酸银等反应产物膜的形成的原因.
银
大气腐蚀
SO2
silver
atmospheric corrosion
Abstract
Electrochemical cell was used to measure the SO2 corrosion of silver under a thin electrolyte layer.The effects of thickness of electrolyte layer,relative humility (%RH),SO2 concentrations and exposure time on the earlier corrosion behavior of silver were investigated by electrochemical impedance spectroscopy (EIS) and polarization.The results showed that the corrosion rate increased while the thickness of electrolyte layer decreased.The relative humidity controlled the reaction process by controlling the thickness of the electrolyte layer on the silver electrode.The electrochemical resistance became higher with increasing SO2 concentration.With the increase of exposure time,the surface resistance increased due to the formation of reaction product film of Ag2O and AgOH.
中图分类号 TG172.3 TG174.3+6
所属栏目 试验研究
基金项目 科技部国家科技支撑计划项目资助(编号2006BAK20B01)
收稿日期 2008/10/16
修改稿日期 2008/12/26
网络出版日期
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备注葛红花,教授.
引用该论文: GUO Rui-feng,GE Hong-hua,YIN Ran,CAI Lan-kun,ZHOU Hao. Electrochemical Behavior of SO2 Corrosion of Silver Electrode in Air Environment[J]. Corrosion & Protection, 2009, 30(11): 761～764
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参考文献
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【3】Masamitsu Watanabe,Akira Hokazono,Takao Handa.Corrosion of copper and silver plates by volcanic gases[J].Corrosion Science,2006,48:3759-3766.
【4】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.
【5】徐乃欣,张承典,丁翠红.加速大气腐蚀试验的一个新方案[J].中国腐蚀与防护学报,1990,10(3):228-232.
【6】曹献龙,萧以德,卢颖,等.Cu/Fe双电极原电池对环境敏感性的研究[J].装备环境工程,2006,3(4):20-26.
【7】Kleber Ch,Wiesinger R,Schnoller J,et al.Initial oxidation of silver surfaces by S2- and S4+ species[J].Corrosion Science,2008,25:1112-1121.
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【10】OESCH S,FALLER M.Environment effects on materials: the effect of the air pollutants SO2,NO2,NO and O3 on the corrosion of copper,zinc and aluminium.a short literature survey and results of laboratory exposures[J].Corrosion Science,1997,39(9):1505-1530.
【11】Volpe L,Peterson P J.The atmosphere sulfidation of silver in a tubular corrosion reactor[J].Corrosion Science,1989,29(10):1179-1196.
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