US3617451A
Expired / Lapsed
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Thiosulfate copper plating
Assignee: MacDermid Inc
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Filing: 1969-06-10
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Granted: 1971-11-02
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Expires: 1989-06-10
Abstract
Abstract A novel electroplating bath suitable for electrodepositing copper on steel which comprises an aqueous solution of soluble copper, an alkali metal thiosulfate, an alkali metal sulfite or bisulfite, and a heterocyclic nitrogen compound such as nicotine, 3-amino-1,2,4-triazole, etc. During the electroplating process, the bath is subjected to aeration. The steel is cleaned and cathodically activated prior to plating.
Inventors
- 👤 Leo J Slominski
- 👤 Adela Landau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:55
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/38
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
15 words
The electroplating bath of claim 1 wherein the soluble copper is derived from cuprous oxide.
Claim 2
Dependent Claim
15 words
The electroplating bath of claim 1 wherein the said alkali metal thiosulfate is sodium thiosulfate.
Claim 3
Dependent Claim
15 words
The electroplating bath of claim 1 wherein the said alkali metal compound is sodium sulfite.
Claim 4
Dependent Claim
34 words
The electroplating bath of claim 1 wherein the said heterocyclic nitrogen compound is selected from the group consisting of pyridine, picoline, bipyridine, quinoline, 2,7-dimethylquinoline, imidazole, 2-methylimidazole, benzimidazole, 3-amino-1,2,4-triazole, 5-aminotetrazole, 3,5-dimethylpyrazole, 2,5-dimethylpiperazine, indole and nicotine.
Claim 5
Dependent Claim
14 words
The electroplating bath of claim 1 wherein the said heterocyclic nitrogen compound is nicotine.
Claim 6
Dependent Claim
14 words
The electroplating bath of claim 1 wherein the said heterocyclic nitrogen compound is 3-amino-1,2,4-triazole.
Claim 7
Dependent Claim
40 words
The electroplating bath of claim 1 wherein the said soluble copper is derived from cuprous oxide, the said alkali metal thiosulfate is sodium thiosulfate, the said alkali metal compound is sodium sulfite and the said heterocyclic nitrogen compound is nicotine.
Claim 8
Dependent Claim
51 words
A dry composition suitable for use in preparing an aqueous solution from which copper may be electrodeposited on steel which comprises the following ingredients in the following approximate percentages by weight: Cuprous oxide 12 Sodium thiosulfate, anhydrous 67 .5 Sodium bisulfite, anhydrous 19 .0 3-amino-1,2,4-triazole 1 .0 Nicotine sulfate 0 .5
Claim 9
Independent Claim
204 words
A method of electrodepositing copper on a steel cathode in which copper is electrodeposited from an electroplating bath composition comprising an aqueous solution of (1) soluble copper in the equivalent of about 0.2 to about 0.5 molar concentration, (2) at least one alkali metal thiosulfate selected from the group consisting of sodium, potassium, and lithium thiosulfate in about 0.4 to about 1.50 molar concentration, (3) at least one alkali metal compound selected from the group consisting of sodium, potassium and lithium sulfite and sodium, potassium and lithium bisulfite in about 0.01 to about 0.5 molar concentration and (4) at least one heterocyclic nitrogen compound in an amount of from about 0.005 to about 0.25 molar concentration; the said heterocyclic nitrogen compound having from 1 to 2 inclusive heterocyclic rings in which each of the said rings has between 5 and 6 members inclusive including at least one N atom and wherein the substituents on the carbon atoms of the said heterocyclic rings are selected from the group consisting of H,-NH2 and alkyl of from one to 10 carbon atoms, wherein the pH of said aqueous solution is maintained between 0.2 and about 7.5 and wherein the electroplating bath is aerated during the electroplating operation.
Claim 10
Dependent Claim
14 words
The process of claim 10 wherein the said alkali metal thiosulfate is sodium thiosulfate.
Claim 11
Dependent Claim
14 words
The process of claim 10 wherein the said alkali metal compound is sodium sulfite.
Claim 12
Dependent Claim
33 words
The process of claim 10 wherein the said heterocyclic nitrogen compound is selected from the group consisting of pyridine, picoline, bipyridine, quinoline, 2,7-dimemethylquinoline, imidazole, 2-methylimidazole, benzimidazole, 3-amino-1,2,4-triazole, 5-aminotetrazole, 3,5-dimethylpyrazole, 2,5-dimethylpiperazine, indole and nicotine.
Claim 13
Dependent Claim
13 words
The process of claim 10 wherein the said heterocyclic nitrogen compound is nicotine
Claim 14
Dependent Claim
13 words
The process of claim 10 wherein the said heterocyclic nitrogen compound is 3-amino-1,2,4-triazole.
Claim 15
Dependent Claim
39 words
The process of claim 10 wherein the said soluble copper is derived from cuprous oxide, the said alkali metal thiosulfate is sodium thiosulfate, the said alkali metal compound is sodium sulfite and the said heterocyclic nitrogen compound is nicotine.
Claim 16
Dependent Claim
72 words
The process of claim 10 wherein the said steel cathode prior to being plated is subjected to a metal cleaning cycle following which it is cathodically activated in a solution of a material selected from the group consisting of sulfuric acid and sodium bisulfate for a period of about 1 to about 10 minutes at 50 to 100 amperes per square foot at a temperature of about 70* to about 100* F.
Claim 17
Dependent Claim
16 words
The process of claim 17 wherein the said material is a 5 percent sulfuric acid solution.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |