Process for producing a promoter of brightness for baths of galvanizacao primary acids with aqueous acid tin solution impregnated and process for eletrodeposicao of bright tin impregnated D.Ito Da

摘要

Improved baths or solutions are provided for the electroplating of tin, and containing as the primary brightener therefor the reaction product of furfural with crotonaldehyde in the presence of a catalytic amount of an alkali. In addition, this invention is concerned with brightening additive compositions for tin-electroplating baths, and with methods for preparing such additive compositions and for electroplating bright tin deposits.