Electrodeposition of tin, lead and tin-lead alloys

Claim 2

A bath for the electrodeposition of bright tin-lead alloys which comprises an aqueous acidic bath containing at least one soluble tin compound and one soluble lead compound to which there has been added: a. a polyalkylene oxide condensation product; and b. at least one pyridine or quinoline compound having the structure ##STR25## wherein the substituents R 1 , R 2 , R 3 , R 4 and R 5 each is a hydrogen or halogen atom, a lower alkyl radical containing a hydroxyl group, an alkenyl radical, the radical (C n H 2n )CO 2 H in which n has a value from 0 to 6 or a carbamide radical or R 4 and R 5 combined form a divalent radical to provide a compound having the structure ##STR26## in which R 6 is nothing or a hydroxyl radical; Z is nothing, O - or a quaternary ammonium forming hydrocarbon radical provided that when Z is nothing, at least one of the substituents R 1 , R 2 , R 3 , R 4 and R 5 is a halogen atom, a lower alkyl radical containing a hydroxyl group, an alkenyl radical, the radical (C n H 2n --CO 2 H in which n has a value from 0 to 6 or a carbamide radical or R 6 is a hydroxyl radical; and X is nothing or when Z is a quaternary ammonium forming hydrocarbon radical X is an anion, the condensation product, and pyridine or quinoline compounds being present in sufficient amount to increase the brightness of the tin-lead alloy deposit over a wide current density range above about 5 amps per square foot.

Claim 3

The bath of claim 1 which contains a soluble thallium compound in sufficient amount to increase the brightness of the deposit in the low current density range below about 5 amps per square foot.

Claim 4

A bath according to claim 1 which also contains an aromatic aldehyde in sufficient concentration to increase the brightness of the tin-lead deposits electrodeposited therefrom.

Claim 5

The bath of claim 3 which contains a soluble thallium compound in sufficient amount to increase the brightness of the deposit in the low current density range above about 5 amps per square foot.

Claim 6

A bath according to claim 3 wherein the aromatic aldehyde is orthomethoxy benzaldehyde, 3-ethoxybenzaldehyde, o-tolualdehyde parachlorobenzaldehyde, cinnamaldehyde, orthochlorobenzaldehyde, furfural, 2-methoxy-4-hydroxybenzaldehyde, orthoallyl ether of 2-hydroxybenzaldehyde, o-propargyl ether of 2-hydroxybenzaldehyde, thiophene-2-aldehyde, orthofluorobenzaldehyde, dichlorobenzaldehyde, difluorobenzaldehyde or orthophthalaldehyde.

Claim 7

A bath according to claim 1 wherein the condensation product is an alkylene oxide/ethylene glycol condensation product, an ethylene oxide/nonylphenol condensation product or an ethylene oxide condensation product of the formula ##STR27## R--S--(C.sub.2 H.sub.4 O).sub.n H ##STR28## R--N--R'--C.sub.2 H.sub.4 O).sub.n H wherein R is an alkyl or aryl radical containing 6 to 20 carbon atoms, R' is (CH 2 ) y wherein y is an integer from 1 to 6 and n and n' are each an integer from 2 to 6.

Claim 8

A bath according to claim 6 wherein the condensation product is derived from nonylphenol condensed with about 12 moles of ethylene oxide.

Claim 9

A bath according to claim 1 wherein the compound of (b) is pyridine-2-carboxylic acid, 2-carboxy-n-methylpyridinium chloride, pyridine-2-6-dicarboxylic acid, nicotinamide, nicotinic acid, pyridine N-oxide, pyridine N-oxide-2-ethanol, pyridine-3-carboxylic acid quaternized with either dimethyl sulphate, methyl p-toluenesulphonate, benzylchloride, 3-chloromethylanisaldehyde or 3-chloromethylparahydroxybenzaldehyde, pyridine N-oxide-3-carboxylic acid, quinoline-2-carboxylic acid, 8-hydroxyquinoline, quinoline N-oxide, 2-vinylpyridine, 2-vinylpyridine N-oxide or 2-chloropyridine N-oxide.

Claim 10

A process for producing bright deposits of tin-lead alloys which comprises electrodepositing tin and lead from an aqueous acidic bath containing at least one soluble tin compound and one soluble lead compound to which there has been added: a. polyalkylene oxide condensation product; and b. at least one pyridine or quinoline compound having the structure ##STR29## wherein the substituents R 1 , R 2 , R 3 , R 4 and R 5 each is a hydrogen or halogen atom, a lower alkyl radical containing a hydroxyl group, an alkenyl radical, the radical (C n H 2n --CO 2 H in which n has a value from 0 to 6 or a carbamide radical or R 4 and R 5 combined form a divalent radical to provide a compound having the structure ##STR30## in which R 6 is nothing or a hydroxyl radical; Z is nothing, O - or a quaternary ammonium forming radical provided that when Z is nothing, at least one of the substituents R 1 , R 2 , R 3 , R 4 and R 5 is a halogen atom, a lower alkyl radical containing a hydroxyl group, an alkenyl radical, the radical (C n H 2n --CO 2 H in which n has a value from 0 to 6 or a carbamide radical or R 6 is a hydroxyl radical; and X is nothing or when Z is a quaternary ammonium forming hydrocarbon radical X is an anion, the condensation product and the pyridine or quinoline compound being present in said bath in a sufficient amount to increase the brightness of the tin-lead alloy deposit over a wide current density range above about 5 amps per square foot.

Claim 11

A process for producing bright deposits of tin-lead alloys which comprises electrodepositing tin and lead from an aqueous acidic bath containing at least one soluble tin compound and one soluble lead compound to which there has been added: a. polyalkylene oxide condensation product; and b. at least one pyridine or quinoline compound having the structure ##STR29## wherein the substituents R 1 , R 2 , R 3 , R 4 and R 5 each is a hydrogen or halogen atom, a lower alkyl radical containing a hydroxyl group, an alkenyl radical, the radical (C n H 2n --CO 2 H in which n has a value from 0 to 6 or a carbamide radical or R 4 and R 5 combined form a divalent radical to provide a compound having the structure ##STR30## in which R 6 is nothing or a hydroxyl radical; Z is nothing, O - or a quaternary ammonium forming radical provided that when Z is nothing, at least one of the substituents R 1 , R 2 , R 3 , R 4 and R 5 is a halogen atom, a lower alkyl radical containing a hydroxyl group, an alkenyl radical, the radical (C n H 2n --CO 2 H in which n has a value from 0 to 6 or a carbamide radical or R 6 is a hydroxyl radical; and X is nothing or when Z is a quaternary ammonium forming hydrocarbon radical X is an anion, the condensation product and the pyridine or quinoline compound being present in said bath in a sufficient amount to increase the brightness of the tin-lead alloy deposit over a wide current density range above about 5 amps per square foot.

Claim 12

The bath of claim 9 which contains a soluble thallium compound in a sufficient amount to increase the brightness of the deposit in the low current density range below about 5 amps per square foot.

Claim 13

A process according to claim 9 in which the bath contains an aromatic aldehyde in sufficient amount to increase the brightness of the tin-lead deposits.

Claim 14

The bath of claim 11 which contains a soluble thallium compound in sufficient amount to increase the brightness of the deposit in the low current density range below about 5 amps per square foot.

Claim 15

A process for producing bright deposits of tin-lead alloys according to claim 11 wherein the aromatic aldehyde is orthomethoxy benzaldehyde, 3-ethoxybenzaldehyde, o-tolualdehyde parachlorobenzaldehyde, cinnamaldehyde, orthochlorobenzaldehyde, furfural, 2-methoxy-4-hydroxybenzaldehyde, orthoallyl ether of 2-hydroxybenzaldehyde, o-propargyl ether of 2-hydroxybenzaldehyde, thiophene-2-aldehyde, orthofluorobenzaldehyde, dichlorobenzaldehyde, difluorobenzaldehyde or orthophthalaldehyde.

Claim 16

a process for producing bright deposits of tin-lead alloys according to claim 9 wherein the condensation product is an alkylene oxide/ethylene glycol condensation product, an ethylene oxide-nonylphenyl condensation product or an ethylene oxide condensation product of the formula ##STR31## R--S--(C.sub.2 H.sub.4 O).sub.n H ##STR32## or R--N--R'--C.sub.2 H.sub.4 O).sub.n H wherein R is an alkyl or aryl radical containing 6 to 20 carbon atoms, R' is (CH 2 ) y wherein y is an integer from 1 to 6 and n and n' are each an integer from 2 to 6.

Claim 17

A process for producing bright deposits of tin-lead alloys according to claim 14 wherein the condensation product is derived from nonylphenol condensed with about 10-14 moles of ethylene oxide.

Claim 18

A process for producing bright deposits of tin-lead alloys according to claim 9 wherein the compound of (b) is pyridine-2-carboxylic acid, 2-carboxy-n-methylpyridinium chloride, pyridine-2-6-dicarboxylic acid, nicotinamide, nicotinic acid, pyridine N-oxide, pyridine N-oxide-2-ethanol, pyridine-3-carboxylic acid quaternized with either dimethyl sulphate, methyl p-toluenesulphonate, benzylchloride, 3-chloromethylanisaldehyde or 3-chloromethylparahydroxybenzaldehyde, pyridine N-oxide-3-carboxylic acid, quinoline-2-carboxylic acid, 8-hydroxyquinoline, quinoline N-oxide, 2-vinylpyridine, 2-vinylpyridine N-oxide or 2-chloropyridine N-oxide.