Patent US4740277A successfully refreshed from Google Patents.
US4740277A
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Sulfate containing bath for the electrodeposition of zinc/nickel alloys
Assignee: ELEKTRO-BRITE 6097 TREBUR/INDUSTRIEGEBIET WEST GERMANY GmbH
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Filing: 1987-05-29
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Granted: 1988-04-26
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Expires: 2007-05-29
Abstract
Abstract Bright electrodeposits of zinc/nickel alloys onto iron of fine crystalline structure are obtained by using an acidic bath containing the sulfates of zinc and nickel, alkali metal acetate and brightening agents, the brightening agents being (1) citric acid, (2) hexin-3-diol-2,5 and (3) naphthalene sulfonic acid having 1 to 3 sulfo groups which is optionally substituted by one or two C 1 -C 4 -alkyl groups and halogen atoms, respectively or a condensation product thereof with formaldehyde.
Inventors
- 👤 Klaus-Peter Klos
- 👤 Karl-Heinz Lindemann
- 👤 Hermann Donsbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:10
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/565
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
101 words
An acidic sulfate containing zinc and nickel containing bath for the electrodeposition of lustrous zinc/nickel alloy coatings onto iron, containing 0.4 to 1.0 mol/liter of zinc and 0.8 to 2.0 mol/liter of nickel as sulfates, 0.08 to 0.2 mol/liter of alkali metal acetate and brighteners characterised in that it contains as brighteners: (1) 0.18 to 0.35 mol/liter of citric acid (2) 0.1 to 2.0 gs/liter of hexin-3-diol-2,5 and (3) naphthalene sulfonic acid with 1 to 3 sulfo groups and optionally 1 or 2 C 1 -C 4 -alkyl groups and halogen atoms, respectively as substituents or condensation products thereof with formaldehyde.
Claim 2
Dependent Claim
101 words
An acidic sulfate containing zinc and nickel containing bath for the electrodeposition of lustrous zinc/nickel alloy coatings onto iron, containing 0.4 to 1.0 mol/liter of zinc and 0.8 to 2.0 mol/liter of nickel as sulfates, 0.08 to 0.2 mol/liter of alkali metal acetate and brighteners characterised in that it contains as brighteners: (1) 0.18 to 0.35 mol/liter of citric acid (2) 0.1 to 2.0 gs/liter of hexin-3-diol-2,5 and (3) naphthalene sulfonic acid with 1 to 3 sulfo groups and optionally 1 or 2 C 1 -C 4 -alkyl groups and halogen atoms, respectively as substituents or condensation products thereof with formaldehyde.
Claim 3
Dependent Claim
42 words
Zinc and nickel containing bath as claimed in claim 1 characterized in that it contains as brighteners: (1) 0.2 to 0.3 mol/liter of citric acid (2) 0.5 to 1.0 gs/liter of hexin-3-diol-2,5 and (3) 0.5 to 1.5 gs/liter of naphthalene sulfonic acid.
References Cited (Backward Citations)
US4699696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-26 | 1991-10-26 | 1992-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-26 | 1995-10-26 | 1996-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-26 | 1999-10-26 | 2000-04-26 | $7700.00 | Window Closed / Lapsed |