METHOD FOR OBTAINING OXIDE COATING ON STEEL Russian patent published in 2012 - IPC C25D11/34 C25D3/56 

FIELD: metallurgy.

SUBSTANCE: invention refers to electrochemistry, and namely to application of strengthening, hard, wear-resistant and protective coatings on steel products and can be used for operation in friction assemblies, for strengthening of surfaces of parts, and in radioelectronic and paint-and-varnish industries. Method involves oxidation using alternating current at temperature of 30 - 40°C in electrolyte containing hydroxy tricarballylic acid; at that, electrolyte also includes salts of cobalt, nickel, molybdenum and iron, boric acid, and oxidation is performed using alternating asymmetric current at ratio of cathode and anode current components of 2:1, cathode current density of 0.83 A·dm^-2, voltage of 15 - 20 V and at ratio of components in electrolyte, g·l^-1: cobaltic sulphate 100 - 150, cobaltichloride 10 - 16, ferric sulphate 8 - 10, nickel sulphate 15 -20, ammonium polymolybdate 35 - 40, boric acid 20 - 30, hydroxy tricarballylic acid 2.5 - 3.

EFFECT: improving wear resistance and corrosion stability of steel surface, reducing power consumption and increasing coating adhesion to the base.

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