Moreover, the measurement is performed in the conditions of idc = 0, approaching the scenario when each spectrum is recorded operando at the OCP conditions. The Nyquist spectra obtained with the DEIS technique during 70 minutes of corrosion monitoring are shown in Fig. . The measurements were done in two conditions: reference 0.05 M NaCl solution (Fig. ) and reference solution to which aqueous permanganate was gradually added to reach the final concentration of 150 mM (Fig. ). Selected spectra in Bode representation are also shown in Fig. .