METHOD OF CLEANING SURFACES OF COPPER AND ITS ALLOYS FROM CORROSION AND OXIDATION BY COPPER COMPOUNDS (II) Russian patent published in 2016 - IPC C23G1/02 C23F1/18 

FIELD: technological processes.

SUBSTANCE: invention relates to cleaning elements of process and household equipment from copper and its alloys from corrosion products and products of oxidation of copper compounds (II) and can be used in various branches of practical activity, in scientific research and in analytical control. Method involves treatment of copper and its alloys surface with aqueous acid solution in the presence of oxidant, in form of air oxygen, and as acid is water solution of 0.033 n., 0.053 n., 0.06 n., 0.07 n, n 0.237 or 0.47 n. of nitric acid. Cleaned surface is fully submerged into said aqueous solution of acid, in which intensive mixing is conducted, stirring and air barbotage or air barbotage, wherein acid flow rate and accumulation of copper (II) compounds are controlled, and after treatment waste reaction mixture is carefully drained, metal or alloy are washed once or twice with distilled water and dried.

EFFECT: method enables effective and fast cleaning of copper and its alloys surface from corrosion and oxidation products, which include copper oxides (I) and (II) and copper (II) hydroxide, wherein providing removal of deposits only located on surface of copper and its alloys without affecting the metal and without changing relief and structure of its surface.

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