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US4461680A
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Process and bath for electroplating nickel-chromium alloys
Assignee: United States, COMMERCE THE, Secretary of
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Filing: 1983-12-30
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Granted: 1984-07-24
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Expires: 2003-12-30
Abstract
Abstract A process for the electrodeposition of a nickel chromium alloy on a cathodic substrate comprises: contacting the substrate with an aqueous electrolyte containing: about 50-125 g/l of CrCl3.6H2O; about 10-125 g/l of NiCl2.6H2O; about 10-115 g/l of formic acid; about 25-50 g/l of boric acid; and about 50-100 g/l of sodium citrate dihydrate; adjusting the pH of the bath to about 1-5 and the temperature to about 20 DEG -60 DEG C.; and passing a sufficient current through the solution and to the substrate to effect deposition thereon of a nickel-chromium alloy.
Inventors
- 👤 David S. Lashmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:25
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/562; C25D5/00; C25D5/10; C25D5/12; C25D5/14; C25D5/18; C25D5/60; C25D5/605; C25D5/611; C25D5/627; Y; Y10; Y10S; Y10S204/00; Y10S204/09
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
96 words
A process for the electrodeposition of a nickel-chromium alloy on a cathodic substrate, comprising: contacting the substrate with an aqueous electrolyte containing: about 50-125 g/l of CrCl 3 .6H 2 O; about 10-125 g/l of NiCl 2 .6H 2 O; about 10-115 g/l of formic acid; about 25-50 g/l of boric acid; and about 50-100 g/l of sodium citrate dihydrate; adjusting the pH of the bath to about 1-5 and the temperature to about 20°-60° C.; and passing a sufficient current through the solution and to the substrate to effect deposition thereon of a nickel-chromium alloy.
Claim 2
Dependent Claim
96 words
A process for the electrodeposition of a nickel-chromium alloy on a cathodic substrate, comprising: contacting the substrate with an aqueous electrolyte containing: about 50-125 g/l of CrCl 3 .6H 2 O; about 10-125 g/l of NiCl 2 .6H 2 O; about 10-115 g/l of formic acid; about 25-50 g/l of boric acid; and about 50-100 g/l of sodium citrate dihydrate; adjusting the pH of the bath to about 1-5 and the temperature to about 20°-60° C.; and passing a sufficient current through the solution and to the substrate to effect deposition thereon of a nickel-chromium alloy.
Claim 3
Dependent Claim
17 words
The process of claim 1, wherein said electrolyte contains up to about 75 g/l of glycolic acid.
Claim 4
Dependent Claim
20 words
The process of claim 1, wherein said electrolyte contains up to about 20 g/l of sodium bromide or ammonium bromide.
Claim 5
Dependent Claim
17 words
The process of claim 1, wherein said electrolyte contains up to about 75 g/l of ammonium chloride.
Claim 6
Dependent Claim
12 words
The process of claim 1, wherein said temperature is about 35° C.
Claim 7
Dependent Claim
11 words
The process of claim 1, wherein said pH is about 3.5.
Claim 8
Dependent Claim
11 words
The process of claim 1, wherein said current is direct current.
Claim 9
Dependent Claim
12 words
The process of claim 1, wherein said current is a pulsed current.
Claim 10
Dependent Claim
33 words
the process of claim 8, wherein the period is 0.05-10 milliseconds; the duty cycle is 20-80%; the base height is -10-+10 A/dm 2 ; and the peak height is 5-100 A/dm 2 .
Claim 11
Dependent Claim
17 words
The process of claim 1, wherein said nickel-chromium alloy deposit is at least about 75 microns thick.
Claim 12
Dependent Claim
21 words
The process of claim 1, wherein the chromium content of said nickel-chromium alloy deposit is at least about 20% by weight.
Claim 13
Dependent Claim
61 words
An aqueous electrolyte for electroplating nickel-chromium alloys by electrodeposition, consisting essentially of an aqueous solution containing: about 50-125 g/l of CrCl 3 .6H 2 O ; about 10-125 g/l of NiCl 2 .6H 2 O; about 10-115 g/l of formic acid; about 25-50 g/l of boric acid; and about 50-100 g/l of sodium citrate; said solution having a pH of 1-5.
Claim 14
Dependent Claim
61 words
An aqueous electrolyte for electroplating nickel-chromium alloys by electrodeposition, consisting essentially of an aqueous solution containing: about 50-125 g/l of CrCl 3 .6H 2 O ; about 10-125 g/l of NiCl 2 .6H 2 O; about 10-115 g/l of formic acid; about 25-50 g/l of boric acid; and about 50-100 g/l of sodium citrate; said solution having a pH of 1-5.
Claim 15
Dependent Claim
16 words
The electrolyte of claim 12, which further contains up to about 75 g/l of glycolic acid.
Claim 16
Dependent Claim
19 words
The electrolyte of claim 12, which further contains up to about 20 g/l of sodium bromide or ammonium bromide.
Claim 17
Dependent Claim
16 words
The electrolyte of claim 12, which further contains up to about 75 g/l of ammonium chloride.
Claim 18
Dependent Claim
10 words
The electrolyte of claim 12, having a pH of 3.5.
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) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |