FIELD: metallurgy.
SUBSTANCE: invention can be used for application of protective-decorative coatings of black colour, in particular for decoration of artistic articles produced by forging, coining, casting and other methods. Electrolytic oxidation of St3kp steel includes electrolytic treatment in bath with electrolyte containing sodium chloride in concentration of 250-300 g/l, in this case oxidation is carried out at alternating current density of 1.1-1.4 a/cm2 and processing time of 120-150 seconds.
EFFECT: reduction of processing time by eliminating preparation and finishing operations.
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