The time-domain response of a corroding system with constant phase angle interfacial component: Application to steel in concrete
The time-domain response of a corroding system with constant phase angle interfacial component: Application to steel in concrete
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DOI：
10.1016/0010-938x(95)00017-e
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发表时间：
1995-07
影响因子：
8.3
通讯作者：
A. Sagüés;S. Kranc;E. I. Moreno
中科院分区：
文献类型：
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作者：
A. Sagüés;S. Kranc;E. I. Moreno
基于该系统的电化学阻抗谱行为，研究了极化电阻测试过程中钢筋在混凝土中的时域响应。该分析考虑了接近恒定相角元件(CPE)行为的表观界面电容的影响。分析了极化电阻和CPE平行组合作用下界面的响应。计算表明，根据电位扫描实验获得的表观极化电阻估算腐蚀速率可能会产生很大的误差。当腐蚀速率较小时，预测误差最大。在常用的电位扫描速率(0.1mV S−1)和混凝土中典型的钢的恒定相元指数(0.7lt；n<；0.9)下，误差可能是显著的。建立了一个数值模型来预测溶液电阻、极化电阻和CPE的组合情况下的时域行为。模型预测用混凝土中被动素钢和镀锌钢的实际试件进行了验证。
The time-domain response of reinforcing steel in concrete during a polarization resistance test was examined based on the electrochemical impedance spectroscopy behavior of the system. The analysis considered the effect of apparent interfacial capacitances that approached the behavior of a constant phase angle element (CPE). The response of an interface behaving as the parallel combination of a polarization resistance and a CPE was examined analytically. The calculations showed that significant error could develop in the estimation of corrosion rates from the apparent polarization resistance obtained during a potential scan experiment. The predicted error was largest when corrosion rates were small. The error could be significant at commonly used potential scan rates (0.1 mV s−1) and constant phase element exponents (0.7 < n < 0.9) typical of steel in concrete. A numerical model was developed to predict the time domain behavior for the combined case of solution resistance, polarization resistance, and CPE. The model predictions were confirmed using actual specimens of passive plain and galvanized steel in concrete.