Patent US3909373A successfully refreshed from Google Patents.
US3909373A
Expired / Lapsed
US
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Non-cyanide zinc plating
Assignee: Oxy Metal Industries Corp
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Filing: 1973-08-06
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Granted: 1975-09-30
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Expires: 1993-08-06
Abstract
Abstract A non-cyanide zinc electroplating bath which contains a linear polyether and a bath soluble heterocyclic nitrogen compound to improve the quality of the zinc electrodeposits obtained. Additionally, the electroplating baths may also contain an organic chelating agent. With this bath, zinc electrodeposits having improved brightness and leveling are produced even from baths having a relatively low zinc content, over a relatively wide pH and current density range. These baths have further been found to be useful in both barrel and rack plating processes.
Inventors
- 👤 Hans-Gerhard Creutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:19
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
79 words
AN AQUEOUS, CYANIDE-FREE ZINC ELECTROPLATING BATH HAVING A PH OF FROM ABOUT 3.5 TO 9.6 AND INCLUDING AS BRIGHTENING AGENTS A LINEAR POLYETHER HAVING A MOLECULAR WEIGHT WITHIN THE RANGE OF ABOUT 500 TO 1,000,000 AND A HETEROCYCLIC NITROGEN COMPOUND IN THE FORM OF THE PROPYL OR ISOPROPYL ESTER OF BENZYL CHLORIDE NICOTINATE, SAID POLYETHER AND NITROGEN COMPOUND BEING SOLUBLE IN THE BATH AND FURTHER BEING PRESENT IN COMBINED AMOUNTS SUFFICIENT TO PRODUCE A ZINC ELECTRODEPOSIT OF IMPROVED BRIGHTNESS.
Claim 2
Dependent Claim
79 words
AN AQUEOUS, CYANIDE-FREE ZINC ELECTROPLATING BATH HAVING A PH OF FROM ABOUT 3.5 TO 9.6 AND INCLUDING AS BRIGHTENING AGENTS A LINEAR POLYETHER HAVING A MOLECULAR WEIGHT WITHIN THE RANGE OF ABOUT 500 TO 1,000,000 AND A HETEROCYCLIC NITROGEN COMPOUND IN THE FORM OF THE PROPYL OR ISOPROPYL ESTER OF BENZYL CHLORIDE NICOTINATE, SAID POLYETHER AND NITROGEN COMPOUND BEING SOLUBLE IN THE BATH AND FURTHER BEING PRESENT IN COMBINED AMOUNTS SUFFICIENT TO PRODUCE A ZINC ELECTRODEPOSIT OF IMPROVED BRIGHTNESS.
Claim 3
Dependent Claim
49 words
An electroplating bath as defined in claim 1, wherein the linear polyether is present in an amount within the range of about 2 to 50 grams per liter and the heterocyclic nitrogen compound is present in an amount within the range of about 10 to 100 milligrams per liter.
Claim 4
Dependent Claim
19 words
An electroplating bath as defined in claim 2, wherein zinc chloride is the source of zinc in the bath.
Claim 5
Dependent Claim
34 words
An electroplating bath as defined in claim 2, in which there is also present in the bath between about 5 to 200 g/l of zinc chloride and 50 to 300 g/l of ammonium chloride.
Claim 6
Dependent Claim
34 words
An electroplating bath as defined in claim 1, in which the polyether is selected from the group consisting of acetylenic glycol 2, 3, 7, 9-tetramethyl 5-decyne-4, 7 diol-ethoxylated and monyl phenoxy poly (ethyleneoxy) -ethanol.
Claim 7
Dependent Claim
67 words
An electroplating bath as defined in claim 1, in which the polyether is present in the bath in an aMount of between about 5 to 10 g/l, the nicotinate is present in an amount of between about 15 to 50 mg/l, and in which there is also present in the bath about 5 to 200 grams/liter zinc chloride and about 50 to 300 grams/liter of ammonium chloride.
Claim 8
Dependent Claim
47 words
An electroplating bath as defined in claim 1, in which there is also present in the bath about 0 to 250 grams/liter of a chelating agent selected from the group consisting of ethylene-diamine tetraacetic acid, nitrilotriacetic acid, ethylene diamine tetraethanol, citric acid and ethylene diamine diacetic acid.
Claim 9
Dependent Claim
20 words
An electroplating bath as defined in claim 1, in which the polyether is acetylenic glycol 2,3,7, 9-tetramethyl 5-decyne-4, 7 diol-ethoxylated.
Claim 10
Dependent Claim
28 words
A method of depositing a smooth, adherent bright zinc deposit, which comprises electrodepositing zinc from an aqueous cyanide-free zinc electroplating bath of the character defined in claim 1.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |