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US4169772A
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Acid zinc plating baths, compositions useful therein, and methods for electrodepositing bright zinc deposits
Assignee: Hull R O and Co Inc
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Filing: 1978-11-06
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Granted: 1979-10-02
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Expires: 1998-11-06
Abstract
Abstract An aqueous acidic plating bath for the electrodeposition of a bright zinc deposit on a substrate is disclosed and comprises zinc ions and an amount, sufficient to provide a level and bright deposit, of at least one bath-soluble composition obtained by the reaction of a nitrogen-containing heterocyclic compound with formaldehyde, an epihalohydrin or glycerol halohydrin and at least one amino compound selected from the group consisting of (i) ammonia, (ii) an aliphatic amine, or (iii) an amidine. Additionally, the plating baths of the invention may contain a nitrogen-containing compound obtained by the reaction of ammonia, an aliphatic amine containing at least one primary amine group, or mixtures thereof with one or more epihalohydrins, glycerol halohydrins or mixtures thereof. Thioureas and anionic aromatic sulfonic acids or salts thereof also are contemplated as being useful in the plating baths of the invention. Methods for depositing a bright zinc coating over a wide range of current densities also are described.
Inventors
- 👤 Richard K. Lowery
- 👤 William J. Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:26
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/22
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
76 words
An aqueous acidic plating bath for the electrodeposition of a bright zinc deposit on a substrate which comprises zinc ions and (A) an amount, sufficient to provide a level and bright deposit, of at least one bath-soluble composition obtained by the reaction of a nitrogen-containing heterocyclic compound with formaldehyde, an epihalohydrin or glycerol halohydrin, and at least one amino compound selected from the group consisting of (i) ammonia, (ii) an aliphatic amine, or (iii) an amidine.
Claim 2
Dependent Claim
76 words
An aqueous acidic plating bath for the electrodeposition of a bright zinc deposit on a substrate which comprises zinc ions and (A) an amount, sufficient to provide a level and bright deposit, of at least one bath-soluble composition obtained by the reaction of a nitrogen-containing heterocyclic compound with formaldehyde, an epihalohydrin or glycerol halohydrin, and at least one amino compound selected from the group consisting of (i) ammonia, (ii) an aliphatic amine, or (iii) an amidine.
Claim 3
Dependent Claim
17 words
The plating bath of claim 1 wherein the nitrogen-containing heterocyclic compound is an unsaturated nitrogen-containing heterocyclic compound.
Claim 4
Dependent Claim
23 words
The plating bath of claim 2 wherein the unsaturated nitrogen-containing heterocyclic compound is an imidazole, a pyridine, a pyrazine or a pyrazole compound.
Claim 5
Dependent Claim
17 words
The plating bath of claim 1 wherein the nitrogen-containing heterocyclic compound is a saturated nitrogen-containing heterocyclic compound.
Claim 6
Dependent Claim
21 words
The plating bath of claim 4 wherein the saturated nitrogen-containing heterocyclic compound is a piperazine, a piperidine or a morpholine compound.
Claim 7
Dependent Claim
24 words
The plating bath according to any one of claims 1-5 wherein the amino compound is an acyclic amine having at least two functional groups.
Claim 8
Dependent Claim
19 words
The plating bath of claim 6 wherein the functional groups are each independently --NH 2 , --NH or --OH.
Claim 9
Dependent Claim
56 words
The plating bath according to any one of claims 1-5 wherein the amino compound is an amidine having the general formula R--C(═NH)NH.sub.2 or the acid salts thereof wherein R is hydrogen, hydroxyl, an aliphatic, alicyclic, aromatic, heterocyclic, amino, amidino, amidenoaryl, carboxy alkyl or --NHR' group wherein R' is an aliphatic, alicyclic, aminoalkyl, aminoalkyl, or carboxyalkyl group.
Claim 10
Dependent Claim
13 words
The plating bath of claim 8 wherein the amino compound is a guanidine.
Claim 11
Dependent Claim
44 words
The plating bath according to any one of claims 1-5 wherein the bath-soluble composition is obtained by the addition of formaldehyde to a heated mixture of the heterocyclic nitrogen-containing compound in the amino compound followed by the addition of the epihalohydrin or glycerol halohydrin.
Claim 12
Dependent Claim
46 words
The plating bath according to any one of claims 1-5 wherein the bath-soluble composition is obtained by the reaction of a nitrogen-containing heterocyclic compound with an amino compound, formaldehyde and an epihalohydrin wherein the molar ratio of the reactants is from about 0.1:0.5:1.0:0.5 to about 0.5:1.5:3.0:1.5.
Claim 13
Dependent Claim
54 words
The plating bath according to any one of claims 1-5 wherein the bath also contains (B) from about 0.25 to about 5 g/l of a nitrogen-containing compound obtained by reacting ammonia, an aliphatic amine containing at least one primary amine group, or mixtures thereof with one or more epihalohydrins, glycerol halohydrins or mixtures thereof.
Claim 14
Dependent Claim
53 words
The plating bath of claim 12 wherein the aliphatic amine containing at least one primary amine group is represented by the formula H.sub.2 N(Alkylene NH).sub.x Alkylene NH.sub.2 wherein X is an integer from 0 to 4 and the alkylene may be a straight or branched chain group containing up to six carbon atoms.
Claim 15
Dependent Claim
35 words
The plating bath of claim 12 wherein the bath also contains (C) at least one thiourea compound having the formula (R'.sub.2 N).sub.2 C═S wherein each R' is independently hydrogen, an alkyl or any alkenyl group.
Claim 16
Dependent Claim
23 words
The plating bath according to claim 14 wherein the bath also contains (D) at least one anionic aromatic sulphonic acid or salt thereof.
Claim 17
Dependent Claim
25 words
The method of electrodepositing a bright zinc coating on a substrate which comprises electroplating said substrate in the aqueous acidic zinc bath of claim 15.
Claim 18
Dependent Claim
25 words
The method of electrodepositing a bright zinc coating on a substrate which comprises electroplating said substrate in the aqueous acidic zinc bath of claim 14.
Claim 19
Dependent Claim
23 words
The plating bath according to claim 12 wherein the bath also contains (D) at least one anionic aromatic sulphonic acid or salt thereof.
Claim 20
Dependent Claim
25 words
The method of electrodepositing a bright zinc coating on a substrate which comprises electroplating said substrate in the aqueous acidic zinc bath of claim 18.
Claim 21
Dependent Claim
25 words
The method of electrodepositing a bright zinc coating on a substrate which comprises electroplating said substrate in the aqueous acidic zinc bath of claim 12.
Claim 22
Dependent Claim
26 words
The plating bath according to any one of claims 1-5 wherein the bath also contains (D) at least one anionic aromatic sulphonic acid or salt thereof.
Claim 23
Dependent Claim
25 words
The method of electrodepositing a bright zinc coating on a substrate which comprises electroplating said substrate in the aqueous acidic zinc bath of claim 21.
Claim 24
Independent Claim
29 words
The method of electrodepositing a bright zinc coating on a substrate which comprises electroplating said substrate in an aqueous acidic zinc bath according to any one of claims 1-5.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |