Abstract
Effects of organic brighteners, formalin, cresol sulfonic acid, and a surface active agent [Emulgen C18H35O(CH2CH2O)9H], on the bright electroplating of tin from an acidic sulphate bath were investigated and the mechanism was discussed. The different effects were observed among the brighteners, benzalacetone, cinnamic aldehyde, cuminaldehyde, and benzaldehyde. By the addition of Emulgen, the depositing potential of tin and hydrogen evolution potential shifted to a less noble potential. The addition of formalin also shifted these potential to a noble potential and thus formalin is considered to be a sub-brightener.
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