METHOD OF PRODUCING OXIDE CATALYTICALLY ACTIVE SURFACE LAYERS OF VALVE METAL OR ITS ALLOY Russian patent published in 2013 - IPC B01J37/34 B01J37/02 C25D11/12 

FIELD: process engineering.

SUBSTANCE: invention relates to catalysis. Proposed method comprises micro arc oxidation in aqueous solutions of electrolyte containing alkaline metal hydroxide and metasilicate, salts of transition metals Mn, Cr or mixes thereof.It differs from know processes in that said micro arc oxidation if performed in pulses anode-cathode mode with duration of anode bursts of 50 ms, that of cathode bursts of 40 ms, intervals there between of 16 mc, mean anode-to-cathode current ratios of 1.1:0.9, from aqueous solutions of electrolyte. Said solution contains three solutions including sodium tefaborate, sodium tungstate, sodium molybdate and sodium metavanadate at successive oxidation therein for 10 min.

EFFECT: better catalytic properties, rust and wear resistance, thermal resistance of oxide layers.

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