Classical electrochemical experiments were carried out on an Autolab PGSTAT302N potentiostat/galvanostat with an FRA32M module for electrochemical impedance spectroscopy (EIS) measurements. The measurements were performed in the following order: the open-circuit potential (OCP) monitoring (1000 s), EIS measurement, low-amplitude polarization resistance measurement, and potentiodynamic polarization measurement. A traditional three-electrode setup with a saturated Ag/AgCl reference electrode and a Pt-mesh counter electrode was used. EIS measurements were carried out at the OCP over a frequency range from 10 5 to 10 -2 Hz using a current sinusoidal perturbation amplitude of 10 mV. The ZView 3.2с software was used for data analysis and spectra fitting.