Baths and additives for the electrodeposition of bright zinc

Claim 2

A zinc brightener additive comprising: from about 99 percent to about 1 percent by weight by a linear aliphatic amine polymer prepared by reacting at a temperature of from about 110° F to about 220° F from about 50 percent to about 150 percent of a stoichiometric amount of an epihalohydrin selected from the group consisting of epichlorohydrin and epibromohydrin and a linear aliphatic polyamine selected from the group consisting of a compound having at least two primary amine groups, two secondary amine groups, or one primary and one secondary amine group, said amine groups separated by two through six methylene groups or alkyl substituted methylene groups, and including from about 1 to about 99 percent by weight of an ethylene oxide condensation product, said product resulting from condensing about 6 to about 30 moles of ethylene oxide with 1 mole of a compound selected from the group consisting of a long chain fatty alcohol, a long chain fatty amine, a long chain fatty acid, a long chain alkyl phenol, wherein said long chains contain from 6 to about 30 carbon atoms, and naphthol.

Claim 3

A zinc brightener additive according to claim 1, including from about 1 to about 20 percent by weight of an aromatic aldehyde or aromatic ketone.

Claim 4

A zinc brightener additive according to claim 2, wherein the aromatic ketone is benzylidene acetone.

Claim 5

A zinc brightener additive according to claim 3, wherein said stoichiometric amount ranges from about 0.75 to about 1.25.

Claim 6

A zinc brightener additive according to claim 2, wherein said ethylene oxide condensation product is a product resulting from a condensation of ethylene oxide and beta naphthol.

Claim 7

A zinc brightener additive according to claim 5, wherein there is also present about 1 to 20 percent by weight of benzylidene acetone.

Claim 8

A zinc brightener additive according to claim 6, wherein said stoichiometric amount ranges from about 0.75 to about 1.25.

Claim 9

A zinc brightener additive according to claim 1, wherein said linear aliphatic polyamine compound is selected from the group consisting of ethylene diamine, propylene diamine, diethylene triamine, triethylene tetramine, tetraethylene pentamine, pentaethylene hexamine, and N-(2-aminoethyl)-1,3-propanediamine.

Claim 10

A zinc brightener additive according to claim 8, including from about 1 to about 20 percent by weight of an aromatic aldehyde or aromatic ketone.

Claim 11

A zinc brightener additive according to claim 9, wherein the aromatic ketone is benzylidene acetone.

Claim 12

A zinc brightener additive according to claim 10, wherein said stoichiometric amount ranges from 0.75 to about 1.25.

Claim 13

A zinc brightener additive according to claim 8, wherein said ethylene oxide condensation product is a product resulting from a condensation of ethylene oxide and beta naphthol.

Claim 14

A zinc brightener according to claim 12, wherein there is also present from about 1 to 20 percent by weight of benzylidene acetone.

Claim 15

A zinc brightener additive according to claim 13, wherein said stoichiometric amount ranges from about 0.75 to about 1.25.

Claim 16

An aqueous, acid zinc electroplating bath for producing a bright electrodeposit of zinc, containing zinc ions, comprising: having dissolved therein from about 0.5 to 10 grams/liter of an aliphatic amine polymer prepared by reacting from about 50 percent to about 150 percent of a stoichiometric amount of an epihalohydrin selected from the group consisting of epichlorohydrin and epibromohydrin with a linear aliphatic polyamine selected from the group consisting of a compound having at least two primary amine groups, two secondary amine groups, or one primary and one secondary amine group, said amine groups separated by two through six methylene groups or alkyl substituted methylene groups, including from about 1 to about 10 grams/liter of an ethylene oxide condensate product, said ethylene oxide condensation product is formed by condensing at least 6 to about 30 moles of ethylene oxide with 1 mole of a compound selected from the group consisting of a long chain fatty alcohol, a long chain fatty amine, a long chain fatty acid, a long chain alkyl phenol, wherein said long chains have from 6 to about 30 carbon atoms, and naphthol.

Claim 17

An aqueous, acid zinc electroplating bath for producing a bright electrodeposit of zinc, containing zinc ions, comprising: having dissolved therein from about 0.5 to 10 grams/liter of an aliphatic amine polymer prepared by reacting from about 50 percent to about 150 percent of a stoichiometric amount of an epihalohydrin selected from the group consisting of epichlorohydrin and epibromohydrin with a linear aliphatic polyamine selected from the group consisting of a compound having at least two primary amine groups, two secondary amine groups, or one primary and one secondary amine group, said amine groups separated by two through six methylene groups or alkyl substituted methylene groups, including from about 1 to about 10 grams/liter of an ethylene oxide condensate product, said ethylene oxide condensation product is formed by condensing at least 6 to about 30 moles of ethylene oxide with 1 mole of a compound selected from the group consisting of a long chain fatty alcohol, a long chain fatty amine, a long chain fatty acid, a long chain alkyl phenol, wherein said long chains have from 6 to about 30 carbon atoms, and naphthol.

Claim 18

The bath according to claim 15, wherein there is also present from about 0.05 to about 0.5 grams/liter of at least one compound selected from the group consisting of aromatic aldehydes and aromatic ketones.

Claim 19

The bath according to claim 16, wherein said aromatic aldehydes and aromatic ketones are selected from the group consisting of benzylidene acetone, vanillan, heliotropin, anisaldehyde, veratraldehyde, acetophenone, acetonaphthone, cinnamic aldehyde, 2-chlorobenzaldehyde, and 2,6-dichlorobenzaldehyde.

Claim 20

The bath according to claim 17, wherein there is also present from about 100 to about 300 grams/liter of ammonium chloride.

Claim 21

The bath according to claim 16, wherein the aromatic ketone is benzylidene acetone.

Claim 22

The bath according to claim 19, wherein the ethylene oxide condenstion product is a product resulting from the condensation of ethylene oxide and beta naphthol.

Claim 23

The bath according to claim 20, wherein said stoichiometric amount ranges from about 0.75 to about 1.25.

Claim 24

The bath according to claim 21, wherein there is also present from about 100 to about 300 grams/liter of ammonium chloride.

Claim 25

The bath of claim 22, wherein the range of zinc ions is from about 7.5 to about 40 grams/liter.

Claim 26

The bath according to claim 19, wherein there is also present from about 100 to 300 grams/liter of ammonium chloride.

Claim 27

The bath according to claim 19, wherein said stoichiometric amount ranges from 0.75 to 1.25.

Claim 28

The bath according to claim 16, wherein there is also present from about 100 to about 300 grams/liter of ammonium chloride.

Claim 29

A bath according to claim 15, wherein the pH is from about 4.0 to about 6.5.

Claim 30

The bath of according to claim 15, wherein said linear aliphatic polyamine compound is selected from the group consisting of ethylene diamine, propylene diamine, diethylene triamine, triethylene tetramine, tetraethylene pentamine, pentaethylene hexamine, and N-(2-aminoethyl)1,3-propanediamine.

Claim 31

The bath according to claim 28, wherein there is also present from about 0.05 to about 0.5 grams/liter of at least one compound selected from the group consisting of aromatic aldehydes and aromatic ketones.

Claim 32

The bath according to claim 29, wherein the pH is from about 4.0 to 6.5

Claim 33

The bath according to claim 29, wherein said aromatic aldehydes and aromatic ketones are selected from the group consisting of benzylidene acetone, vanillan, heliotropin, anisaldehyde, veratraldehyde, acetophenone, acetonaphthone, cinnamic aldehyde, 2-chlorobenzaldehyde, and 2,6-dichlorobenzaldehyde.

Claim 34

The bath according to claim 31, wherein the aromatic ketone is benzylidene acetone.

Claim 35

The bath according to claim 32, wherein the ethylene oxide condensation product is a product resulting from the condensation of ethyelene oxide and beta naphthol.

Claim 36

The bath according to claim 33, wherein said stoichiometric amount ranges from about 0.75 to about 1.25.

Claim 37

The bath according to claim 34, wherein there is also present from about 100 to about 300 grams/liter of ammonium chloride.

Claim 38

The bath of claim 35, wherein the range of zinc ions is from about 7.5 to about 40 grams/liter.

Claim 39

The bath according to claim 32, wherein there is also present from about 100 to about 300 grams/liter of ammonium chloride.

Claim 40

The bath according to claim 32, wherein said stoichiometric amount ranges from 0.75 to about 1.25.

Claim 41

The bath according to claim 31, wherein there is also present from about 100 to about 300 grams/liter of ammonium chloride.

Claim 42

The bath according to claim 29, wherein there is also present from about 100 to about 300 grams/liter of ammonium chloride.

Claim 43

The bath according to claim 28, wherein there is also present from about 100 to about 300 grams/liter of ammonium chloride.

Claim 44

The bath of claim 15 wherein said zinc ions are obtained from a zinc chloride salt.

Claim 45

The bath of claim 15, wherein there is also present from about 100 to about 300 grams/liter of ammonium chloride.