In the case of the classical EIS measurements discussed in the present contribution, lowfrequency inductive loops were considered in the data analysis. However, for the g-DEIS measurement, the low-frequency range was limited to 0.7 Hz to ensure the system stationarity. Therefore, no inductive response was registered in the inhibited solutions and the lowest applied frequencies correspond to the response of the surface film consisting of Mg oxide/hydroxide and Mo-rich species . To analyze the g-DEIS data, the equivalent circuit shown as an inset in Fig. was used. In this circuit Rs is the solution resistance, R1 represents the surface film resistance , and the constant phase element (CPE1) represents a capacitive response of the surface film formed on the electrode surface . The dynamics of the change of the circuit parameters in time is shown in Fig. .