摘要
采用动电位极化曲线法研究了钢筋在混凝土模拟孔隙液中腐蚀电化学行为．结果表明：随着Ｃｌ－离子浓度升高，ＰＨ值下降，腐蚀电流（Ｉｃｏｒｒ）增大，破裂电位（Ｅｎ）降低：致使钢筋表面钝化膜破裂的临界Ｃｌ－离子浓度与孔隙液的ｐＨ值之间存在对数关系．提出了Ｃｌ－和ＯＨ－在钝化膜局部区域上的竞争吸附模型，并解释了实验结果．
The electrochemical corrosion behavior of rebar in simulated pore solution was studied by potentiodynamic polarization. The critical relationship between pH and the concentration of chloride ion was obtained. The relationship is explained by competitive adsorption of chloride ions and hydroxide ions for local area on the passive film. The corrosion rate(I corr ) increased however the breakdown potential of passive film (E b) decreased with the increase of the concentration of chloride ion (C Cl - ) and the decrease of pH.
出处
《腐蚀科学与防护技术》
CAS
CSCD
1997年第2期140-143,共4页
Corrosion Science and Protection Technology
基金
国家自然科学基金
中国科学院"百人计划"资助
关键词
钢筋
混凝土
模拟孔隙液
腐蚀
电化学保护
rebar, simulated proe solution, potentiodynamic polarization curve
