The classical EIS analysis showed that a low-frequency inductive loop was clearly visible in the Nyquist spectra in all examined conditions, showing a great difference between impedance values based on Rct and Rp. In this case, the inductive property is often associated with the relaxation processes of adsorbed intermediates of the corrosion process . However, to provide a reliable EIS measurement the system must fulfill three main requirements, namely, stationarity, linearity, and causality. Classical EIS measurements of Mg alloys' corrosion are often largely affected by the system's non-stationarity , which might cause the occurrence of the low-frequency inductive tail . Therefore, dynamic g-DEIS measurements were also performed. In the selected frequency interval (22000-0.7 Hz) the measurement time is less than 1 s, which allows to perform the measurement in quasi-stationary conditions . The g-DEIS spectra of AZ31-xLi alloys obtained in the solutions with and without the molybdate inhibitor during 70 minutes of immersion are shown in Fig. .