Abstract: Cyanide-free alkaline zinc electroplating baths for depositing highly lustrous zinc coatings on steel or iron. The results are attained with alkaline zinc baths containing a reaction product obtained by conversion of substantially equal molar quantities of (a) a reaction product of a nitrogen compound containing at least two nitrogen atoms with an epihalohydrin, or a mixture of such reaction products, with either (b1) a reaction product of an alcohol or a carboxylic acid with an epihalohydrin, or a mixture of such reaction products, and/or (b2) a pyridine compound having from 1 to 3 methyl or ethyl groups and/or 1 to 3 carboxylic groups, or salts of (b1) and (b2). Zinc coated objects produced with the baths can be tempered without adversely affecting the zinc coating.

Abstract: Zinc articles or, respectively, articles being electroplated with zinc are rapidly coated with a resistant and well adhering colored electroless chromium plating by immersing the articles in an aqueous bath containing besides known wetting agentsA. a solution of 12.5 to 37.5 g/l. of sodium dichromate and 12.5 to 37.5 g/l. of sodium nitrate, said solution being adjusted to a pH value of 0.3 with nitric acid,B. 25 to 70 g./l. of formic acid and/or chloroformic acid,C. 0 to 40 ml./l. of glacial acetic acid and concentrated acetic acid respectively and/or glycolic acid, glycocoll, chloroacetic acid, trifluoro-acetic acid and, if desiredD. 0 to 15 ml./l. of formaldehyde and maintaining the pH of the solution at a pH value of 1.4 to 2.7.