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First of all, the conditions of the realization of the PEP among other electrolyte-plasma processes are considered. PEP of metals and alloys is performed only with the anode polarity of the part. In the 1970s, it was found that the anodic stationary heating in sulphuric acid solutions ceases at voltages of 180–260 V (at 250–290 V in solutions of ammonium chloride or at 140 V or more in sodium hydroxide solutions) [56]. In this case, the temperature of the sample drops sharply, and the colour of the glow of the VGE changes. Currently, PEP is carried out at approximately such voltages, therefore, in this article the mode under discussion will be called the polishing mode, because the adjective “electro hydrodynamic” used in a number of publications does not reflect the essence of the process. There are some problematic issues of the PEP mechanism. They are the nature of the current through the vapour-gaseous layer, the mechanisms of metal removal and surface levelling, the presence of the gas layer (plasma) in contact with the metal surface or with the oxide (oxide-salt film) on its surface, as well as the present of at least short-term local contacts of the electrolyte with the surface of the metal or oxide film [57].
The nature of the removal of metal from the treated surface is associated with the mechanism of the passage of current through the VGE, which three types of charge carriers can realize.