The iron-plating process in methyl sulfate chloride electrolytes was investigated. The conditions of iron plating ensuring the coating adherence with steel and pig iron required in the technological processes of reconditioning and strengthening of machine pieces are determined. Process conditions ensuring the high coating adherence with steels 45, 15HGT, 40H, and grey and high-strength pig iron are found; they include steps: powering on of the polarizing current with the initial density of 0.15–0.5 kA/m2 immediately after insertion of pieces in the electrolyte and raising of the current density up to the working level with a rate of 4–5 A/m2 s. Metallographic, polarizing, and other research show the influence of the initial electrolysis conditions on the formation of the first layers of coverings and the process of iron electrocrystallization on structural phases of tempered steel and grey and high-strength pig iron.