Abstract
1. An investigation into the conditions of formation of fine tin powders from chloride-fluoride electrolytes has shown that finely divided tin is precipitated on the cathode in the form of a black deposit with a current efficiency close to 100% at a cathodic current density of not more than 5 A/dm2. 2. The kinetic parameters of the process of finely divided tin deposition have been calculated. Analysis of the result obtained leads to the conclusion that the tin ion discharge act proper is preceded by a stage linked with oleic acid adsorption on the electrode. 3. The optimum process parameters for the production of finely divided tin under prolonged electrolysis conditions are as follows: 150 g/liter SnCl2 · 2H2O, 60 g/liter NH4F, ic=2 A/dm2, T=20°C, a stainless steel cathode, and an upper electrolyte layer of a 0.5% solution of oleic acid in toluene.
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