Abstract: Novel Polyalkylenglycol naphthyl-3-sulfopropyl diethers and salts thereof of the formula ##STR1## (R.sub.1 -R.sub.3 =H, C.sub.p H.sub.2p--1 ; p=l--4, A=(PO).sub.m --(EO).sub.n --, (EO).sub.n --(PO).sub.m,--(EO).sub.n EO=ethylenoxide residue, PO=propylenoxide residue, m=0-15, n-1-40, A=H, alkali metal, earth alkali metal, NR.sub.5 R.sub.6 R.sub.7 R.sub.8 wherein R.sub.5 -R.sub.8 =H, C.sub.1 -C.sub.4 --alkyl, aryl, aralkyl) are prepared by reacting the corresponding polyalkylene glycol naphthyl either with propane-1.3-sultone. The compounds are surfactants in particular in electroplating baths for precipitation Zn, Sn, Cu, Ag, Ni and alloys thereof.

Abstract: A bath for electoplating zinc containing in aqueous solution a zinc salt, an alkali metal hydroxide, optionally, an aromatic aldehyde or ketone and other usual additives and, if desired, an alkali metal cyanide and further, as a brightener, one or more reaction products obtained by reacting (a) an epihalohydrin with a heterocyclic nitrogen compound containing at least two reactive nitrogen atoms which compound may be substituted by 1 or 2 methyl, ethyl or amino groups or of a mixture of such reaction products of the epihalohydrin and the nitrogen compound in a molar ratio of 1:1 with (b) ammonia, an aliphatic amine, polyamine and/or polyimine in a molar ratio of 1:0.3 to 1:1 said bath yielding highly brilliant zinc coatings which may be up to 40 .mu.m thick and are abrasion resistant and resistant to temperatures up to about 220.degree. C. in a range of current densities of from 0.5 to 5 amps/dm.sup.2.

Abstract: Bright deposits of tin and tin/lead alloys by electrocoating are obtained by using a bath containing tin salts and, optionally, lead salts, aldehydes and/or ketones as brighteners as well as surfactants besides sulfuric acid and/or borofluohydric acid wherein part or all of the aldehydes and/or ketones are replaced by a cyclic reaction product of one or more aromatic aldehydes and epihalohydrin of the general formula ##STR1## (Hal being chlorine or bromine, R being a phenyl, naphthyl or pyridyl radical which is optionally substituted by one to three members of the group consisting of chlorine, bromine or fluorine atoms, alkyl or alkoxy groups having 1 to 3 carbon atoms, carboxy and hydroxy groups). Preferably the cyclic reaction product is contained in the bath in an amount of from 0.1 to 2 g/liter of the bath.