“…In some cases, the etching (pitting) of the electrode surface is also observed. In general, the result of anodization depends on the nature of the metal, alloying additives, surface morphology, properties of surface oxide films, type of ionic liquid (hydrophobic/hydrophilic), presence/absence of water, temperature and other factors [17][18][19]. The influence of the nature of the ionic liquid (hydrophilic/hydrophobic) was studied during the anodization of Ti, Ni, crystalline steel.…”