Reduction nickel plating with boron reducing agents and organic divalent sulfur stabilizers

Claim 1

AN AQUEOUS METAL AND PLASTIC PLATING BATH FOR PLATING BY CHEMICAL REDUCTION CONSISTING ESSENTAILLY OF AN AQUEOUS SOLUTION OF (1) A PLATING METAL SELECTED FROM THE GROUP CONSISTING OF NICKEL, COBALT, AND MIXTURES THEREOF IN AN AMOUNT OF BETWEEN 0.02 AND 0.5 MOL PER LITER, (2) A BORON COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL BOROHYDRIDES, TRIMETHYL AMINE BORANE, DIMETHYL AMINE BORINE, DIMETHYL AMINE BORANE, DIETHYL AMINE BORANE, AND ISOPROPYL AMINE BORANE IN AN AMOUNT OF BETWEEN 0.1 AND 10 G. PER LITER AS REDUCING AGENT FOR SAID SOLUTION, (3) A COMPLEX FORMING AGENT SELECTED FROM THE GROUP CONSISTING OF AMMONIA, ETHYLENE DIAMINE, ETHANOL AMINE, TETRAMETHYLENE DIAMINE, DIETHYLENE TRIAMINE, TRIETHYLENE TETRA-AMINE, ETHYLENE DIAMINO-TETRA-ACETIC ACID, AND NITRILO-TRIACETIC ACID IN AN AMOUNT OF BETWEEN 0.2 AND 5 MOLS PER LITER, AND (4) AT LEAST ONE ORGANIC DIVALENT SULFUR COMPOUND SELECTED FROM THE GROUP CONSISTING OF THIO-DIGLYCOLIC ACID, B-THIO-DIPROPIONIC ACID, 1,1''-THIO-BIS-(2,2,2TRICHLORO-ETHANOL), (METHYLENE-DITHIO)-DIACETIC ACID, 1-THEYL-THIOETHANOL, 2,2''-THIO-DIETHANOL, A-AMINO-Y(METHYL-THIO)-BUTYRIC ACID, BIS-(N-Y-OXYPROPYL)THIO-DIPROPYLENE GLYCOL-DICARBOXYLIC ACID AMIDE, S(2-CARBOXYPHENYL)-THIO-GLYCOLIC ACID, S(8-CHLORO-1NAPHTHYL)-THIOGLYCOLIC ACID, (P-CHLOROPHENYL-THIO)ACETIC ACID, (2-METHYL 3-CHLOPHENYL-THIO)-ACETIC ACID, (PENTACHLOROPHENYL-THIO)-ACETIC ACID, (2-NITRO-4ACETAMIDOPHENYL-THIO)-ACETIC ACID, 2-(A-HYDROXYETHYL-THIO)-4-ETHYLBENZOIC ACID, 3-CARBOXYMETHYLTHIO-2-ANTHRQUINONE CARBOXYLIC ACID (DI-NA-SALT), ACETYLENE-DITHIO-SALICYLIC ACID, 4,4''-DINITRO-DIPHENYLSULFIDE-6,6''-DISULFONIC ACID, 2,2''-THIO-DI(5-AMINOBENZENE SULFONIC ACID), 2-THIOPHENE CARBOXYLIC ACID, 3,4-DIPHENYL-THIOPHENE-2,5-DICARBOXYLIC ACID, 3-HYDROXY-THIONAPHTHENE-2-CARBOXYLIC ACID, 2-HYDROXYTHIOAPHTHENE, 2-HYDROXY-3-DIBENZO-THIOPHENECARBOXYLIC ACID, 2,3-THIOAPHTHENEDION, 2-(P-AMINOPHENYL)-5-SULFO-6-BENZOTHIAZOLE CARBOXYLIC ACID, 2AMINO-5-(6''METHYL-2''-BENZOTHIO-AZOLYL)-1,3-BENZENE DISULFONIC ACID, 2-(M-AMINOPHENYL)-7-HYDROXYNAPHTHO-(2,3-D)THIOAZOLE-5-SULFONIC ACID IN AN AMOUNT OF BETWEEN 0.001 AND 5 G. PER LITER.