FIELD: protection of metals from corrosion. SUBSTANCE: electrolyte is prepared by mixing with water of 10-20 mas. of sulfuric acid, 2-4 mas. of isopropyl alcohol with subsequent cooling to temperature from -2.5 to +2.5 C. Oxide film is formed for 1-3 h in two stages. At the first stage, current density in circuit is brought up to 1-1.2 A/sq.dm for 15-20 min, and at the second stage up to 2-4 A/sq.dm according to the relationship given in the invention description. EFFECT: higher efficiency. 2 tbl
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