METHOD FOR ELECTRIC DEPOSITION OF TIN Russian patent published in 2003 - IPC

FIELD: electrochemical deposition of tin, electroplating possibly in machine engineering, instrument making, electronic industry for coating different parts. SUBSTANCE: method for electric deposition of tin in electrolyte containing stannum sulfate, sulfuric acid, synthanol, Formalin and water comprises steps of electric deposition of tin at temperature 18 - 25 C upon agitating electrolyte; introducing to electrolyte coumarin as brightness forming additive at next relation of ingredients (g/l): stannum sulfate, 5 - 50 ; sulfuric acid, 90 -110; synthanol, 1 - 2; Formalin, 2.5 -3; coumarin, 1.5 -2; realizing electric deposition at electric current density 1 -10 A/sq. dm; additionally introducing coumarin in small bags of propylene cloth and calculating quantity of coumarin according to condition of working over one week at flowrate of coumarin 0.01g/A x h; suspending said bags in bath between anodes. EFFECT: enhanced quantity of bright coating. 2 cl, 1 tbl