GB815916A - Process for the production of electrolytic nickel coatings using internal salts of aromatic bases as plating bath additives - Google Patents

Abstract

815,916. Electroplating with nickel. DEHYDAG DEUTSCHE HYDRIERWERKE G.m.b.H. March 9, 1956 [March 16, 1955], No. 7388/56. Class 41. Levelling nickel coatings of enhanced lustre are electrodeposited from nickel baths including 0.1 to 10 g./1. of the product of reaction between a tertiary mono- or polynuclear heterocyclic nitrogen base of aromatic type and a 1: 3 or 1: 4 sultone, the carbon chain of which may be of aliphatic or aromatic nature or combinations thereof. Typical suitable bases are pyridine and its C-substituted homologues and halogen, alkoxy, and nitro derivatives thereof, quinoline and its C-methyl derivatives, isoquinoline, acridine, phenanthridine, and bases containing two or more nitrogen atoms such as pyridazine and its isomers, quinoxaline and its isomers, phenazine; while typical sultones are 1: 3- propane- and 1: 4-butane-sultones which may be substituted, e.g. by alkyl groups on any carbon atom in the chain, 1: 8-naphthosultone, and tolylsultone. Wetting agents, pore-preventing agents, conducting salts or lustring agents may also be included in the bath. In an example, bright levelling deposits are obtained at a current density of 6 amps./sq. dm. on iron or copper from a Watts bath at 60<SP>o</SP> C. containing additionally 4 to 8 g./1. of sodium ditolyl disulphimide and 0.8 g./1. of the internal salt of pyridinium-N-propane-#-sulphonic acid. Reference has been directed by the Comptroller to Specification 721,204.