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Some regularities of formation of Cu2-xS coatings

The interaction of Cu 2 O + Cu(OH) 2 adsorbed with Na 2 S 4 in the course of formation of Cu 2 x S coatings by a cyclic method has been investigated using the methods of cyclic voltammetry and radiochemistry ( 35 S). (One cycle of Cu 2 x S coating formation consists of the treatment of the surface to be coated in a solution of Cu (I) + Cu (II) ammoniates, rinsing-hydrolysis and sulphidation in Na 2 S 4 solution). Only 25% of the Cu 2 x S coating has been found to be formed due to adsorption of Cu (I) + Cu (II) and up to 10% due to S 4 2 adsorption. The remaining portion (∼ 65%) of the coating is formed due to interaction of Cu (I) with elemental sulphur S 0 ad +2Cu + → CuS ad +Cu 2+ and the exchange occurring in the course of repeating the cycle CuS ad +2(1-x)Cu + → Cu 2-x S ad +(1-x) Cu 2+ . Elemental sulphur is supposed to be formed in a sulphidation stage through individual and mixed intermediates of Cu (I) and Cu (II) polysulphides as well as during the hydrolysis of the adsorbed S 4 2 (≤10% S o ).