| abstract |
A modified polymeric additive for zinc plating baths based on polyalkyleneimines has carbamoyl and/or thiocarbamoyl groups. It is produced by reacting a polyalkyleneimine which may be partially alkylated, sulfoalkylated, acylated or quaternized with an isocyanate or isothiocyanate. In cyanidic, but in particular in cyanide-free zinc baths, it yields highly ductile, matt, fine-grained, semi-lustrous or highly lustrous zinc coatings. |