CHROMATING COMPOSITION FOR PROCESSING OF ZINC CURTAIN AND ZINC WIRE Russian patent published in 2018 - IPC C23C22/07 C23C22/22 

FIELD: metallurgy.

SUBSTANCE: chromating composition contains, g/l: Cr ³⁺ ions 50-70, phosphate ions 200-280, nitrate ions 23-46, titanium ions 5-10, inhibitor 1-2, water - the rest. As an inhibitor, it contains 50% alcoholic solution of alkylmethylammonium chloride, and as titanium and nitrate ions - spent etching solution from the production of titanium tubes containing nitrate ions - 16%, titanium ions - 3.5%.

EFFECT: proposed invention without the use of hexavalent chromium allows to obtain a colorless chromate film with a high corrosion resistance on the galvanized surface of rolled products and wire.

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