Patent US4743346A successfully refreshed from Google Patents.
US4743346A
Expired / Lapsed
US
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Electroplating bath and process for maintaining plated alloy composition stable
Assignee: FCI Americas Technology LLC
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Filing: 1986-07-01
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Granted: 1988-05-10
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Expires: 2006-07-01
Abstract
Abstract A plating bath and process for electroplating coatings of palladium nickel alloys on a conductive substrate at current densities in the range of 10 amps/sq. ft. to 150 amps/sq. ft. wherein the palladium content of the alloy remains substantially constant despite current density variations during plating. The alloy composition stability is acheived by adding at least about 15 parts per million of iodide ions to the plating bath.
Inventors
- 👤 Arthur H. Graham
- 👤 Kenneth B. Keating
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:47
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/567; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12875
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
50 words
An electroplating bath for plating a coating of palladium-nickel alloy on an electrically conductive substrate and which is capable of maintaining the palladium content of the plated alloy substantially constant, said bath comprising a palladium salt, a nickel salt and at least about 15 parts per million of iodine ions.
Claim 2
Dependent Claim
50 words
An electroplating bath for plating a coating of palladium-nickel alloy on an electrically conductive substrate and which is capable of maintaining the palladium content of the plated alloy substantially constant, said bath comprising a palladium salt, a nickel salt and at least about 15 parts per million of iodine ions.
Claim 3
Dependent Claim
19 words
The bath of claim 1 further including a conductive salt and having a pH in the range between 7-9.
Claim 4
Dependent Claim
42 words
The bath of claim 2 wherein the palladium salt is palladium (II) ammine chloride, the nickel salt is selected from the group consisting of nickel ammine sulfate, nickel sulfate and nickel chloride, and the conductive salt is ammonium sulfate or ammonium chloride.
Claim 5
Dependent Claim
10 words
The bath of claim 2 further including an organic brightener.
Claim 6
Dependent Claim
16 words
The bath of claim 4 wherein the organic brightener is sodium vinyl sulfonate or quaternized pyridinium.
Claim 7
Dependent Claim
18 words
The bath of claim 1, wherein the palladium salt is first purified through at least one recrystallization cycle.
Claim 8
Dependent Claim
43 words
A process for plating a coating of palladium-nickel alloy on an electrical terminal using the bath of claim 1 wherein a plating current density in the range of between about 10 amps/sq.ft. to about 150 amps/sq. ft. is applied to the electrical terminal.
Claim 9
Dependent Claim
21 words
The process of claim 7, wherein the current density is in the range between about 25 amps/sq.ft. to about 100 amps/sq.ft.
Claim 10
Dependent Claim
22 words
The process of claim 7, wherein the current density on the terminal may vary by as much as a factor of four.
Claim 11
Dependent Claim
115 words
A process for plating a coating of palladium-nickel alloy on an electrically conductive substrate wherein the palladium content of the alloy remains substantially constant, said process comprising the steps of: (a) immersing the electrically conductive substrate in an electroplating bath comprising a palladium salt, a nickel salt and at least 15 parts per million of iodide ions; (b) applying plating current to the bath wherein the current density on the conductive substrate is in the range of about 10 amps/sq. ft. to about 150 amps/sq. ft.; and (c) depositing a coating of palladium-nickel alloy on said substrate having a palladium content which varies less than 10 in weight percent over the current density range applied.
Claim 12
Dependent Claim
115 words
A process for plating a coating of palladium-nickel alloy on an electrically conductive substrate wherein the palladium content of the alloy remains substantially constant, said process comprising the steps of: (a) immersing the electrically conductive substrate in an electroplating bath comprising a palladium salt, a nickel salt and at least 15 parts per million of iodide ions; (b) applying plating current to the bath wherein the current density on the conductive substrate is in the range of about 10 amps/sq. ft. to about 150 amps/sq. ft.; and (c) depositing a coating of palladium-nickel alloy on said substrate having a palladium content which varies less than 10 in weight percent over the current density range applied.
Claim 13
Dependent Claim
27 words
The process of claim 10 wherein the current density on the conductive substrate is in the range of about 25 amps/sq. ft. to about 100 amps/sq. ft.
Claim 14
Dependent Claim
23 words
The process of claim 11 wherein the current density on the conductive substrate may vary by as much as a factor of four.
Claim 15
Dependent Claim
12 words
The process of claim 10 wherein the bath contains an organic brightener.
Claim 16
Dependent Claim
18 words
The process of claim 10 wherein the palladium salt is first purified through at least one recrystallization cycle.
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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) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |