Abstract
This paper proposes an alternative model for simulating electrochemical impedance spectra of protective organic coatings on the metal substrate. It describes broadening of the semicircle in the complex plane (Nyquistplot) and Bode plots behavior using commercial software Software ZSimpWin 3.22 in the absence and with of corrosion reactions. Before this process, the appropriate modified electrical equivalent circuit had selected where constant phase element had used instead of a capacitor for reach to reality. The result helps to understand the system under study i.e. the change of impedance behavior with electrochemical processes.