A Study of Corrosion Inhibitor Performance in Chloride Contaminated Concrete by Electrochemical Impedance Spectroscopy

Electrochemical impedance spectroscopy and linear polarization techniques were used to study five-year-old "lollipop-like "-concrete specimens containing sodium nitrite and dinitrobenzoic acid. An equivalent circuit model considering the physical characteristics ofthe rehar/concrete face was used to simulate the impedance spectra. The RC parameters obtained from the impedance spectra simulation including the maximum phase angle shift and polarization resistance were used to characterize the rebar corrosion. The effectiveness of the