A study on chloride-induced depassivation of mild steel in simulated concrete pore solution

被引：231
作者：
Saremi, M [1 ]
Mahallati, E [1 ]
机构：
[1] Univ Tehran, Dept Mat & Met Engn, Fac Engn, Tehran, Iran
来源：
CEMENT AND CONCRETE RESEARCH | 2002年 / 32卷 / 12期
关键词：
corrosion; concrete; pore solution; passivation; chloride;
D O I：
10.1016/S0008-8846(02)00895-5
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The effect of chloride ions on passivity breakdown of steel in simulated concrete pore (SCP) solution was studied using electrochemical techniques. In this regards, the sensitivity of cyclic potentiodynamic parameters such as DeltaE (difference between E-pit and E-rep), i(peak) and AC-impedance parameters like R-et, R-f, C-i, R-ad and C-ad to chloride ion concentration was investigated. Adsorption of OH- ions on the metal surface in free chloride SCP solution and also displacement of those ions by Cl- ions were demonstrated in high frequency part of Nyquist plots. In addition, a severe decrease in resistance of interfacial reaction (R-f+R-ct) was observed through breakdown of passive film in the [Cl-]/[OH-] ratio of 0.6. The interfacial capacitance, C-i, was abruptly raised when localized corrosion changed to general one, (C) 2002 Elsevier Science Ltd. All rights reserved.
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页码：1915 / 1921
页数：7
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