US3972788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc anode benefaction
Assignee: M&T HARSHAW
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Filing: 1975-01-06
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Granted: 1976-08-03
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Expires: 1995-01-06
Abstract
Abstract This invention relates to an improved method of electroplating zinc while simultaneously effecting enhanced anode corrosion characteristics, which comprises passing current from a zinc anode to a metal cathode through a plating solution containing at least one organic brightener, a chloride-containing salt providing chloride anions and boric acid as a buffer in the absence of ammonium cations, chelating agents, and complexing agents for a time period sufficient to deposit a zinc electrodeposit upon said cathode; the improvement consisting of the current passing through an aqueous acidic bath composition containing zinc sulfamate providing zinc cations for electroplating zinc.
Inventors
- 👤 Frank Passal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:06
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
61 words
An improved aqueous acidic plating solution for anode benefaction containing 100 to 200 grams per liter of zinc sulfamate providing zinc cations for electroplating zinc, 25 to 40 grams per liter of sodium chloride providing chloride anions and 20 to 35 grams per liter of boric acid as a buffer in the absence of ammonium cations, chelating agents, and complexing agents.
Claim 2
Dependent Claim
61 words
An improved aqueous acidic plating solution for anode benefaction containing 100 to 200 grams per liter of zinc sulfamate providing zinc cations for electroplating zinc, 25 to 40 grams per liter of sodium chloride providing chloride anions and 20 to 35 grams per liter of boric acid as a buffer in the absence of ammonium cations, chelating agents, and complexing agents.
Claim 3
Dependent Claim
77 words
In a method of electroplating zinc while simultaneously effecting enhanced anode corrosion characteristics which comprises passing current from a zinc anode to a metal cathode through an acidic zinc electroplating bath comprising an aqueous solution of: a. 100 to 200 grams per liter of zinc sulfamate; b. 25 to 40 grams per liter of sodium chloride; c. 20 to 35 grams per liter of boric acid; and d. containing no ammonium cations, or chelating or complexing agents.
Claim 4
Dependent Claim
77 words
In a method of electroplating zinc while simultaneously effecting enhanced anode corrosion characteristics which comprises passing current from a zinc anode to a metal cathode through an acidic zinc electroplating bath comprising an aqueous solution of: a. 100 to 200 grams per liter of zinc sulfamate; b. 25 to 40 grams per liter of sodium chloride; c. 20 to 35 grams per liter of boric acid; and d. containing no ammonium cations, or chelating or complexing agents.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |