US4411965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for high speed nickel and gold electroplate system and article having improved corrosion resistance
Assignee: OMI International Corp
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Filing: 1982-08-16
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Granted: 1983-10-25
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Expires: 2002-08-16
Abstract
Abstract A method of electrodepositing a gold alloy layer having improved corrosion protection is disclosed. Prior to the gold layer an underlayer of ductile, low-stress nickel is electrodeposited from a solution containing ortho-formyl benzene sulfonic acid and perfluorocyclohexyl potassium sulfonate.
Inventors
- 👤 Donald R. Rosegren
- 👤 Linda J. Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:41
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/62; C25D3/12; C25D5/00; C25D5/10; C25D5/12; C25D5/60; C25D5/605; C25D5/611; C25D5/627; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12889
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
123 words
A process for obtaining an improved corrosion-resistant gold plating on a substrate which comprises the following sequential plating steps: (a) electrodepositing a ductile, stress-free nickel coating on said substrate from an electroplating bath containing a nickel salt, an electrolyte selected from the group consisting of boric acid, and citric acid, ortho-formyl benzene sulfonic acid, and as a wetting agent, perfluorocyclohexyl potassium sulfonate; and (b) electrodepositing a base metal hardened gold coating on the resulting ductile, stress-free nickel plated substrate from an electroplating bath containing a gold salt, an electrolyte selected from the group consisting of acetic acid, citric acid, formic acid and mixtures thereof, and a metal salt hardener selected from the group consisting of cobalt, indium, nickel, zinc salts and mixtures thereof.
Claim 2
Dependent Claim
123 words
A process for obtaining an improved corrosion-resistant gold plating on a substrate which comprises the following sequential plating steps: (a) electrodepositing a ductile, stress-free nickel coating on said substrate from an electroplating bath containing a nickel salt, an electrolyte selected from the group consisting of boric acid, and citric acid, ortho-formyl benzene sulfonic acid, and as a wetting agent, perfluorocyclohexyl potassium sulfonate; and (b) electrodepositing a base metal hardened gold coating on the resulting ductile, stress-free nickel plated substrate from an electroplating bath containing a gold salt, an electrolyte selected from the group consisting of acetic acid, citric acid, formic acid and mixtures thereof, and a metal salt hardener selected from the group consisting of cobalt, indium, nickel, zinc salts and mixtures thereof.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the nickel salt is nickel sulfate and the electrolyte is boric acid.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein electroplating bath (a) is operated at a pH of 2 to 5.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the electrodeposition steps (a) and (b) are carried out with insoluble anodes.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the gold salt is a gold cyanide salt.
Claim 7
Dependent Claim
14 words
The process of claim 5 wherein said electroplating bath (b) utilizes potassium gold cyanide.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein said electroplating bath (b) utilizes acetic acid as the electrolyte.
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein said electroplating bath (b) utilizes cobalt sulfate as the base metal salt.
Claim 10
Dependent Claim
16 words
The process of claim 1 wherein said electroplating bath (b) utilizes citric acid as the electrolyte.
Claim 11
Dependent Claim
19 words
The process of claim 1 wherein said electroplating bath (b) utilizes formic acid and citric acid as the electrolyte.
Claim 12
Dependent Claim
23 words
A substrate having formed thereon a cobalt-hardened gold/low stress nickel composite coating with improved corrosion resistance prepared by the process of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |