Abstract
The interaction of additives with the cathode and the interplay of saccharin, 2-butyne-1,4-diol and phthalimide was investigated by determination of the consumption rates ( V c) of the additives, accumulation rates ( V a) of the cathodic reaction products and the incorporation of sulfur and carbon in electrodeposits. The main transformation products of saccharin were benzamide, o-toluene sulphonamide and benzylsultame, while phthalimide gave rise to phthalimidine and o-toluene amide. Cathodic reaction products showed the adsorption modes of the additives on electrodeposits. Saccharin and phthalimide in the mixture increased V c as well as V a of o-toluene sulfonamide and phthalimidine. 2-Butyne-1,4-diol decreased V a of o-toluene sulfonamide and phthalimidine and increased the V a of benzamide and incorporation of sulfur. The increase of V c and V a showed a synergistic effect of the additives. The aromatic compounds in the mixture under study increased additive adsorption by the carbonyl group and 2-butyne-1,4-diol increased the adsorption of saccharin by the sulfonyl group.
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