US4366034A
Expired / Lapsed
US
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Hard chromium plating process for cobalt-chromium-tungsten alloys
Assignee: AMERICAN DAVIDSON Inc
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Filing: 1981-06-04
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Granted: 1982-12-28
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Expires: 2001-06-04
Abstract
Abstract This is a process for providing good adhesion of chromium electroplated onto a chromium and tungsten containing cobalt alloy (comprising 40-60% by weight cobalt, 19-25% chromium and 10-20% tungsten). Prior to electroplating, the cobalt alloy surface is etched with a 1-45% ferric solution for 1-200 minutes at 10 DEG -100 DEG C. Preferably, the surface is cleaned with an alkaline solution prior to etching and rinsed with cold water after etching.
Inventors
- 👤 Herbert E. Ricks
- 👤 Edward F. Sverdrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:00
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/28; C25; C25D; C25D5/00; C25D5/34; C25D5/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
In a process for electroplating chromium onto the surface of a cobalt-based metallic substrate, wherein said substrate comprises 40-60% cobalt, 19-25% chromium, 10-20% tungsten, the improvement which comprises: etching said surface in a ferric chloride solution prior to said electroplating, said ferric chloride etching being with a 1-45% ferric chloride solution for 1-200 minutes at 10°-100° C.
Claim 2
Dependent Claim
57 words
In a process for electroplating chromium onto the surface of a cobalt-based metallic substrate, wherein said substrate comprises 40-60% cobalt, 19-25% chromium, 10-20% tungsten, the improvement which comprises: etching said surface in a ferric chloride solution prior to said electroplating, said ferric chloride etching being with a 1-45% ferric chloride solution for 1-200 minutes at 10°-100° C.
Claim 3
Dependent Claim
15 words
The process of claim 1, wherein said etching is at a temperature of 60°-90° C.
Claim 4
Dependent Claim
12 words
The process of claim 2, wherein said etching is for 10-30 minutes.
Claim 5
Dependent Claim
13 words
the process of claim 3, wherein said etching solution is 30-45% ferric chloride.
Claim 6
Dependent Claim
16 words
The process of claim 4, wherein said substrate is cold water rinsed immediately after said etching.
Claim 7
Dependent Claim
17 words
The process of claim 5, wherein said substrate is cleaned with an alkaline solution prior to etching.
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) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |