Electrodeposition of tin-cobalt and tin-cadmium-cobalt alloys from fluoride-chloride electrolytes

The use of fluoride-chloride electrolytes, intended for the deposition of tin-cadmium alloys, on introduction of cobalt(II) compounds into them, apparently makes it possible to obtain ternary alloys and to evaluate some of their physicomechanical characteristics, as well as the character of polarization in the codeposition of cobalt in alloys. A study was carried out by the method of taking partial polarization curves under standard (both galvanostatic and also potentiostatic) regimes in a cell with separated electrode compartments. Electrolytes studied, in which tin(II), cadmium(II), and cobalt(II) were introduced in the form of chlorides and ammonium fluoride served as the background component (ligand with respect to tin), are shown. To unify electrolyte compositions, a constant composition of the solutions was maintained with respect to the surface-active substances introduced - phenol, gelatin, and thiourea.