METHOD FOR OBTAINING GRADIENT CATALYTIC COATING Russian patent published in 2013 - IPC C23C28/04 C23C14/35 C25D5/28 

FIELD: metallurgy.

SUBSTANCE: method for obtaining gradient catalytic coating on a substrate from titanium or its alloy involves formation of an intermediate porous underlayer from titanium oxides and application of coating using a magnetron sputtering method. When applying the above coating, magnetron sputtering of a metal component of system (Ti-Ru), (Ti-Ru-Ir) or (Zr-Ru) is performed in a vacuum chamber in medium of plasma-forming gas - argon and reaction gas - oxygen. Argon pressure is maintained at constant level during the whole sputtering process, and partial oxygen pressure is increased as per linear law of 0 to 8·10^-2 Pa during 10 minutes and when oxygen pressure is steady, the above metal composition is sputtered till required thickness so that gradient catalytic coating is obtained, in which content of oxides is increased from 0% to 100% from the intermediate layer to surface.

EFFECT: obtaining corrosion-resistant coating to increase operating life of anodes with a coating with low content of metal impurities reducing corrosion resistance of the coating, high characteristics of electrocatalytic activity in relation to processes taking place in water cleaning systems, rather high mechanical strength of the coating itself and higher adhesive strength with an intermediate underlayer.

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