Acid zinc electroplating electrolyte, process and additive

Claim 2

A COMPOSITION FOR PROVIDING BRIGHT ZINC ELECTRODE DEPOSITS WHICH COMPRISES AN AQUEOUS ACIDIC ELECTROLYTE COMPOSITION CONTAINING AT LEAST ONE ZINC COMPOUND PROVIDING ZINC IONS FOR ELECTROPLATING ZINC, A SOURCE OF CHLORIDE ION, 0.05 TO 20G./1. OF AT LLAST ONE NONIONIC POLYOXYETHYLENE COMPOUND, 0.05 TO 2 G./1. OF AT LEAST ONE KETONE, AND 0.05 TO 20 G./1. OF AT LEAST ON CARBOXYLIC ACID, SAID POLYOXYETHYLENE COMPOUND BEING SELECTED FROM COMPOUNDS OF THE FORMULA:

Claim 3

A composition according to claim 1 having a zinc metal content within the range of about 30 to 60 g./l. with the zinc added as zinc chloride, a total chloride ion content of about 150 to 190 g./l. with the chloride other than zinc chloride being added in the form of ammonium chloride, a pH in the range of about 3.5 to 6.1, the polyoxyethylene compounds being present in the range of about 0.05 to 20 g./l., the ketone being present in the range of about 0.05 to 2 g./l., and the carboxylic acid being present in the range of about 0.05 to 20 g./l.

Claim 4

A composition according to claim 2 having a pH in the range of about 5 to 6, a content of polyoxyethylene compounds in the range of about 2 to 10 g./l., a ketone content of about 0.1 to 0.5 g./l., and a carboxylic acid content of about 1 to 6 g./l. wherein said polyoxyethylene compounds are polyoxyethylene 2,4,7, 9-tetramethyl-5-decyne-4,7 diol and said ketone is 4-phenyl-3-buten-2-one.

Claim 5

A composition according to claim 1 wherein the polyol is 2,4, 7,9-tetramethyl-5-decyne-4,7 diol.

Claim 6

A composition according to claim 1 wherein the polyol is polyoxypropylene glycol of molecular weight of at least 900.

Claim 7

A composition according to claim 1 wherein the polyol is N,N, N'',N''-tetrakis(polyoxypropylene glycol) ethylene diamine of molecular weight at least about 500.

Claim 8

A composition according to claim 1 wherein said ketone is 4-phenyl-3-buten-2-one.

Claim 9

A composition according to claim 1 wherein said ketone is 4-(4-methoxyphenyl)-3-buten-2-one.

Claim 10

A composition according to claim 1 wherein said ketone is 4-(3,4-dimethoxyphenyl)-3-buten-2-one.

Claim 11

A composition according to claim 1 wherein said ketone is 4-(3,4-methylenedioxyphenyl)-3-buten-2-one.

Claim 12

A composition according to claim 1 wherein said ketone is 4-(2-furyl)-3-buten-2-one.

Claim 13

A composition according to claim 1 wherein said carboxylic acid is benzoic acid.

Claim 14

A composition according to claim 1 in which the pH is in the range of about 3.5 to 6.1.

Claim 15

A composition according to claim 1 wherein the zinc concentration measured as metal is in the range of about 30 to 60 g./l., and the zinc is provided as zinc chloride.

Claim 16

A composition according to claim 1 wherein the bath has a total chloride ion concentration of about 150 to 190 g./l., with the major portion of the chloride being provided as zinc chloride and ammonium chloride.

Claim 17

A composition according to claim 1 wherein the polyoxyethylene compounds are present in a concentration range of about 2 to 10 g./l.

Claim 18

A composition according to claim 1 wherein the ketone is present in concentration range of about 0.1 to 0.5 g./l.

Claim 19

A composition according to claim 1 wherein the carboxylic acid is present in a concentration range of about 1 to 6 g./l.

Claim 22

A method of claim 19 operated at temperatures in the range of 15* to 40*C. with a zinc metal content within the range of about 30 to 60 g./l., the zinc being added as zinc chloride, a total chloride ion content of about 150 to 190 g./l. with the chloride other than zinc chloride being added in the form of ammonium chloride, a pH in the range of about 3.5 to 6.1, the polyoxyethylene compounds being present in the range of about 0.05 to 20 g./l., the ketone being present in the range of about 0.05 to 2 g./l., and the carboxylic acid being present in the range of about 0.05 to 20 g./l.

Claim 23

A method of claim 20 having a pH in the range of about 5 to 6, a content of polyoxyethylene compounds in the range of about 2 to 10 g./l., a ketone content of about 0.1 to 0.5 g./l., and a carboxylic acid content of about 1 to 6 g./l. wherein said polyoxyethylene compounds are polyoxyethylene 2,4,7,9-tetramethyl-5-decyne-4,7 diol and said ketone is 4-phenyl-3-buten-2-one.

Claim 24

A method of claim 19 wherein the pH is in the range of about 3.5 to 6.1.

Claim 25

A method of claim 19 wherein the zinc concentration measured as metal is in the range of about 30 to 60 g./l., and the zinc is provided as zinc chloride.

Claim 26

A method of claim 19 wherein the bath has a total chloride ion concentration of about 150 to 190 g./l., with the major portion of the chloride being provided as zinc chloride and ammonium chloride.

Claim 27

A method of claim 19 wherein the polyoxyethylene compounds are present in a concentration range of about 2 to 10 g./l.

Claim 28

A method of claim 19 wherein the ketone is present in a concentration range of about 0.1 to 0.5 g./l.

Claim 29

A method of claim 19 wherein the carboxylic acid is present in a concentration range of about 1 to 6 g./l.

Claim 30

An organoaqueous addition agent for use in preparing an acid zinc electroplating bath composition, said addition agent comprising: 10 to 400 g./l. of at least one nonionic polyoxyethylene compound selected from the group consisting of

Claim 31

An organoaqueous addition agent for use in preparing an acid zinc electroplating bath composition, said addition agent comprising: 10 to 400 g./l. of at least one nonionic polyoxyethylene compound selected from the group consisting of

Claim 32

An addition agent according to claim 28 wherein the polyoxyethylene compounds are polyoxyethylene 2,4,7,9-tetramethyl-5-decyne-4,7 diols, the ketone is 4-phenyl-3-buten-2-one, and the carboxylic acid is benzoic acid.

Claim 33

An addition agent according to claim 29 containing 20 to 50 g./l. of the polyoxyethylene compounds, 20 to 50 g./l. of the ketone, and 20 to 50 g./l. of the carboxylic acid.