Patent GB-732562-A (GB)
Title: Electrodeposition of nickel
Inventor: JR WILBUR JAY SHENK
IPC: C25D3/18
Filed: 1952-10-10
Abstract: 732,562. Electrodeposition of nickel. HARSHAW CHEMICAL CO. Oct. 10, 1952, No. 25397/52. Class 41. In a method of electrodepositing nickel the bath used comprises an aqueous solution of nickel sulphate or chloride or a mixture of both, to which has been added a compound comprising two heterocyclic radicals, each containing a nitrogen atom in the ring, said radicals being connected to each other through the nitrogen atoms by means of a carbon chain having from 1 to 5 carbon atoms or a plurality of such chains connected through oxygen or phenylene, this compound being present in a concentration from 0.001 to 0.01 grams per litre, the solution also containing a cyclic organic compound containing the group, the carbon atom in this group being nuclear carbon, present in a concentration from 0.2 to 15 grams per litre. The first addition compound may belong to a group having the general formula P-[CRR<1>]n-O([CRR<1>]n<SP>1>-O)n<SP>11>-[CRR<1>]n<SP>111>-<P1> where P and P<1> may be substituted or unsubstituted pyridinium or isoquinolinium groups, R and R<1> may be, independently, hydrogen, alkyl (methyl, ethyl, propyl) or phenyl, n, n<1> and n<111> may be integers from 1 to 5, and n<11> may be an integer from 0 to 3. Examples are N,N<1>-(oxydiethylene)-bis-isoquinolinium chloride; N,N<1>-(oxydiethylene)-bispyridinium perchlorate; N,N<1> - (oxydimethylene) - bis - pyridinium chloride; N,N<1>- (oxydimethylene) - bis - isoquinolinium chloride; N,N<1> - (oxydimethylene) - bis - (2 - methyl- 5 - ethyl) pyridinium chloride; N,N<1> - oxydi- (trimethylene) - bis - pyridinium chloride; N,N<1> - (oxyethylene methylene) - bis - pyridinium chloride; N,N<1>-(oxymethylene) isoquinolinium chloride (ethylene) pyridinium chloride; N,N<1> - (dioxytriethylene) - bis - pyridinium chloride; N,N<1> - (oxydiethylene) - bis - 3- methyl isoquinolinium bromide; N,N<1>-(oxymethylene)-pyridinium chloride (ethylene) isoquinolinium chloride. The first addition compound may also be of the general formula P-[CRR<1>]n-P<1>, where P, P<1>, R and R<1> are as before, and n is an integer from 1 to 5. Examples are N,N<1>-ethylene-bis-quinolinium bromide; N,N<1> - methylene - bis - pyridinium bromide; N,N<1> - ethylene - bis - pyridinium bromide; N,N<1> - methylene - bis - isoquinolinium bromide; N,N<1>-methylene-bis-(alpha-picolinium) bromide; N,N<1> - cyclohexene - bispyridinium bromide; N,N<1>-styrene-bis-pyridinium bromide; N,N<1> - methylene - bis - (2- methyl - 5 - ethyl pyridinium) bromide. The first addition compound may thirdly be of the group having the general formula P-[CRR<1>]n-(C6H4-[CRR<1>]n<SP>1> )n<SP>11>-P<1>, where P, P<1>, R and R<1> are as before, and n is an integer from 1 to 3, n<1> is an integer from 0 to 3, and n<11> is an integer from 1 to 3. Examples are N,N<1> - (o - xylylene - bis) - pyridinium bromide; N,N<1> - (p - xylylene) - bis - pyridinium bromide; N,N1 - - (n - xylylene) - bis - (alpha - picolinium) bromide; N,N<1> - (p-xylylene) - bis - isoquinolinium bromide. The second addition compound, the cyclic organic compound containing the group, may be benzene mono-sulphonic acid; benzene disulphonic acids; mono-chlorobenzene mono-sulphonic acids; dichlorobenzene disulphonic acids; 2,5-dibromobenzene sulphonic acid; toluene sulphonic acids; benzaldehyde sulphonic acids; diphenyl sulphonic acids; thiophene sulphonic acids; diphenyl sulphone sulphonic acids; naphthalene disulphonic acids; naphthalene monosulphonic acids; chloronaphthalene disulphonic acids; potassium, sodium, nickel and cobalt salts of the foregoing; dibenzene sulphonamide; dichloro dibenzene sulphonamides; N-ethane sulphonyl benzene sulphonamide; benzene mono-sulphonamide; saccharine, sodium salt or anhydride; benzene sulphonyl chloride; chlorobenzene sulphonamides; xylene sulphonamides ; toluene sulphonamides; sulphonated naphthalene. The first addition compound is preferably present in a concentration of from 0.005 to 0.01 grams per litre, and the second compound preferably from 1. to 7 grams per litre. The solution may contain a wetting agent, such as sodium lauryl sulphate, and a buffering agent, such as boric acid, formic acid or ammonium sulphate.