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Electrochemical impedance spectroscopy (EIS) is a technique used to evaluate the electrochemical behavior of metallic materials in different environments. In this study, a mathematical model has been developed to analyse the relationship between solution resistance and concentration conductive-corrosion products (Fe2O3) of metallic corroded materials. This model has been designed as a part of an experimental series to use EIS as a tool for mapping the spatial distribution of corrosion by-product from bridge, in order to evaluate the impact of conductive-corrosion on the properties of the solution. The influence of Fe2O3 on the solution resistance at varying concentrations, has been modelled. Repetitive electrochemical tests were conducted to investigate the relationship between the impedance and concentration in three different concentrations of corrosion by-product. Nyquist and Bode's graphs have been used to quantitatively analyse the EIS data. The implementation of the proposed mathematical model can quantify the solution resistace based on the mass of presented particles, and provide significant efficiency and methodological advancement over EIS technique. The experimental outcomes show a clear link between solution resistance and iron oxide concentration within the solution which is consistent with the model's finding.
Ikani et al. (Tue,) studied this question.
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