Characteristics of Electrochemical Impedance Spectroscopy of Epoxy Coatings Modified by Nano-SiO 2

Through co-mixing method,nano-SiO_2 modified epoxy coatings were prepared.Electrochemical impedance spectroscopy(EIS) was used to study the evolution of Nyquist and Bode plots of coating/electrode systems in 3.5 mass%NaCl solution.Four kinds of equivalent circuit impedance models were adopted to fit EIS plots to characterize the corrosion process of the systems. The parameters in high frequency area of Bode plots were also selected to rapidly assess the anticorrosion performance of the hybrid coatings.