ULTRASONIC-ASSISTED ELECTRODEPOSITION OF SnNi(C) COMPOSITE COATINGS

By changing various parameters: content of graphite particles, ultrasonic stirring and electrolyte temperature data on the growth rate, elemental composition and morphology of electrodeposited Sn-Ni(C) composites on copper were obtained. The coatings deposition was performed at galvanostatic conditions in gluconate-glycinate electrolyte with pH = 4÷4.5. Graphite powder (type Soft) with a concentration of 1÷4 g L-1 was introduced into the electrolyte. Coatings deposited under “quiet” conditions are coarse-crystalline and the graphite particles are unevenly distributed. By increasing the temperature to 60 0C, ultrasonic stirring and graphite content in the solution of 3 g L-1, the coatings become finer-crystalline and smooth. The Ni content increased by about 11 wt.% and това на Sn varies between 44 wt.% to 71wt% in these conditions. When applying ultrasonic stirring and when the graphite content in the solution increases from 0 to 4 g L-1, the average growth rate of the coating varies around higher limits (from 108 mg cm-2 h-1 to 74 mg cm-2 h-1 ) compared to " the "quiet" conditions (from 95 mg h-1 to 44 mg cm-2 h-1).