US4314893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of multiple zinc-containing coatings
Assignee: OMI International Corp
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Filing: 1980-02-19
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Granted: 1982-02-09
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Expires: 2000-02-19
Abstract
Abstract Markedly superior corrosion protective properties are imparted to metal-bearing surfaces at substantially reduced costs by depositing upon said surfaces one or more superimposed coatings containing zinc alloying elements located intermediate the metal-bearing surfaces and a sacrificial layer of generally pure zinc. In this manner penetration of rust inducing substances into the metal bearing surfaces is effectively precluded under substantially all environmental conditions normally encountered.
Inventors
- 👤 Richard J. Clauss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:34
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/10; C23; C23C; C23C28/00; C23C28/02; C23C28/023; C23F; C23F13/00; C23F13/02; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A method for the production of a corrosion-resistant article which comprises subjecting a metal-bearing surface of steel or iron-based alloys to electroplating in a zinc-alloy electroplating bath to form on said surface a zinc-alloy deposit which contains from about 3 to 15% of an alloying element selected from the group consisting of nickel, iron, cobalt and mixtures thereof, the remainder of said alloy being zinc, and, thereafter, electroplating on said initial zinc-alloy coating a second zinc electrodeposit in which the content of the said alloying elements is at least 1.4% less than the content of the alloying elements in the said first deposit, the remainder of said alloy being zinc.
Claim 2
Independent Claim
110 words
A method for the production of a corrosion-resistant article which comprises subjecting a metal-bearing surface of steel or iron-based alloys to electroplating in a zinc-alloy electroplating bath to form on said surface a zinc-alloy deposit which contains from about 3 to 15% of an alloying element selected from the group consisting of nickel, iron, cobalt and mixtures thereof, the remainder of said alloy being zinc, and, thereafter, electroplating on said initial zinc-alloy coating a second zinc electrodeposit in which the content of the said alloying elements is at least 1.4% less than the content of the alloying elements in the said first deposit, the remainder of said alloy being zinc.
Claim 3
Dependent Claim
46 words
The method as claimed in claim 1 wherein both the initial and second electrodeposits are produced from the same zinc-alloy electroplating bath and the amount of agitation of the bath is varied during electrodeposition to control the amount of alloying element deposited in each electrodeposited coating.
Claim 4
Dependent Claim
16 words
The method as claimed in claim 1 wherein the second electrodeposited coating is substantially pure zinc.
Claim 5
Independent Claim
25 words
The method as claimed in claims 2, 3, or 1 wherein a chromate salt passive film is applied on top of the second electrodeposited coating.
References Cited (Backward Citations)
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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) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |