Using linear system principles and network analysis, a unique characteristic of the charge transfer occurring in the usage of the Coulostatic method was evaluated. It was found that such transfer to the electrochemical corrosion cell approximates a current impulse, and that the cell voltage response in the time domain to that impulse, completely and directly, described the cell electrochemical impedance. By applying Fourier transform techniques to the cell impulse response, it was possible to obtain an alternating current (AC) impedance representation for the cell. A qualitative evaluation procedure for this proposed approach was defined, and the discharge signals of some network models for real cells were simulated. The AC impedance, generated by the approach, was found to be equivalent to the ones obtained using AC Impedance techniques, both in the Bode and Nyquist format, The potential advantage of the present approach is that the impedance data can be obtained much faster and typically in the order of seconds. Keywords: Coated System, Corrosion, Cell, Coulostatic Technique, AC Impedance Technique, Electrochemical Impedance, EIS, Electrical Circuit Model, Network Model, Laplace Transform, Fourier Transform, Bode Diagram, Nyquist Diagram, Data Acquisition, Data Processing, Software.