SOLUTION FOR THE CHEMICAL SILVERING OF COPPER ALLOYS AND A METHOD OF ITS PRODUCTION Russian patent published in 2017 - IPC C23C18/42 

FIELD: chemistry.

SUBSTANCE: solution for chemical silvering of copper alloys contains: silver chloride (in terms of metal) 4-5 g/l, thiourea 70-80 g/l, hydrochloric acid 55-65 ml/l, wetting agent OP-7 6-8 ml/l, ethyl alcohol or isopropyl alcohol 5-10 ml/l. The method of solution preparation involves mixing thiourea with hydrochloric acid with the following ratio of components: thiourea 70-80 g/l, hydrochloric acid 55-65 ml/l. Afterwards, the OP-7 wetting agent is added to the solution in an amount of 6-8 ml/l and ethyl or isopropyl alcohol in an amount of 5-10 ml/l, and this solution is passed through a silver chloride precipitate.

EFFECT: reducing the impact of toxic compounds on the environment and process equipment, improving working conditions, the possibility of multiple regeneration of the working solution for chemical silvering of copper alloys.

2 cl