PROCESS OF REDUCTION OF CHEMICAL COMPOSITION OF TIN-PLATING ELECTROLYTE DURING ITS USAGE Russian patent published in 1998 - IPC

FIELD: electrolytic tin-plating. SUBSTANCE: invention is related to processes of deposition of coats in production of tin-plate. Process lies in periodic replenishment of electrolyte by results of analysis with chemical components which includes solution of sulphamine acid and surface active substance - proxamine 385 that are prepared in advance. First powder of sulphamine acid is solved in water at temperature 75-80 C in the course of not less than 3 h, then proxamine 385 is added at temperature 45-50 C. Sulphamine acid and surface active substance are used in the amounts of 200-250 g/l and 0.1-0.15 g/l correspondingly. EFFECT: decreased additional consumption of tin and chemicals, increased electrochemical activity of electrolyte, prevention of formation of resinous substances and enhanced quality of products. 1 cl, 1 tbl