物理化学学报 >> 2003, Vol. 19 >> Issue (01): 46-50.doi: 10.3866/PKU.WHXB20030111

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氯离子侵蚀下钢筋在混凝土中腐蚀行为的EIS研究

胡融刚;黄若双;杜荣归;林昌健   

  1. 厦门大学化学系，材料科学与工程系,固体表面物理化学国家重点实验室，厦门　361005
  • 收稿日期:2002-04-18 修回日期:2002-07-10 发布日期:2003-01-15
  • 通讯作者: 林昌健 E-mail:cjlin@xmu.edu.cn

Study on Corrosion Behavior of Reinforcing Steel in Concrete Subjected to Chloride Contamination by EIS

Hu Rong-Gang;Huang Ruo-Shuang;Du Rong-Gui;Lin Chang-Jian   

  1. Department of Chemistry, Department of Material Science and Engineering, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen,　361005
  • Received:2002-04-18 Revised:2002-07-10 Published:2003-01-15
  • Contact: Lin Chang-Jian E-mail:cjlin@xmu.edu.cn

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摘要： 应用电化学阻抗谱（EIS）和氯离子探针技术，研究在氯化物侵蚀作用下混凝土中钢筋的腐蚀行为.结果表明，钢筋混凝土体系的阻抗谱中包含两个时间常数，分别对应于界面的双电层和钢筋表面的混凝土保护层.自行研制的氯离子探针可连续、无损地测量钢筋/混凝土界面的氯离子浓度.根据腐蚀反应电阻Rct、Warburg阻抗等元件参数和界面氯离子浓度的变化，讨论了混凝土中钢筋腐蚀发生、发展各阶段界面化学环境及钢筋腐蚀参数的变化规律.

关键词: 钢筋, 混凝土, 阻抗谱, 氯离子, 腐蚀

Abstract: Electrochemical impedance spectroscopy(EIS) and chloride sensor were employed to study the corrosion behavior of reinforcing steel in concrete. EIS results indicated that the reinforced concrete system contains two time constants, one derived from electrical double layer of reinforcing steel and the other from concrete layer. The electrical double layer was denoted by a constant phase element other than a capacitor. Ag/AgCl chloride sensor was applied in probing and monitoring the Cl－ at steel/concrete interface. A discussion was carried out on the relationship between the electrochemical behavior of rebar and the interfacial chemistry of steel/concrete.

Key words: Reinforcing steel, Concrete, Electrochemical impedance spectroscopy(EIS), Chloride, Corrosion