US3850732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zirconium rinse for phosphate coated metal surfaces
Assignee: Henkel Corp
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Filing: 1972-08-17
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Granted: 1974-11-26
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Expires: 1992-08-17
Abstract
Abstract A metal surface upon which a conversion coating has already been formed, is treated by contacting the surface with an aqueous solution consisting of a soluble zirconium containing compound, thereby improving the qualitiies of the conversion coating.
Inventors
- 👤 R Binns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:19
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A METHOD FOR RINSING A METAL SURFACE HAVING A PHOSPHATE CONVERSION COATING THEREON, COMPRISING APPLYING TO THE SURFACE AN AQUEOUS COMPOSITION CONSISTING ESSENTIALLY OF WATER AT LEAST .05 GRAMS/LITER OF ZIRCONIUM, EXPRESSED AS ZRO2, WHEREIN THE SOURCE FOR THE ZIRCONIUM IN SAID COMPOSITION IS A WATER SOLUBLE ZIRCONIUM COMPOUND, AND A STABILIZING AGENT SELECTED FROM THE GROUP CONSISTING OF GLUCONIC ACID AND SALTS THEREOF, AND CITRIC ACID AND SALTS THEREOF, PRESENT IN AN AMOUNT SUCH THAT FOR EACH PART BY WEIGHT OF ZIRCONIUM THERE IS AT LEAST .5 PARTS BY WEIGHT OF STABILIZING AGENT; AND WHEREIN THE PH OF THE COMPOSITION IS WITHIN THE RANGE OF FROM ABOUT 3 TO ABOUT 8.5.
Claim 2
Independent Claim
112 words
A METHOD FOR RINSING A METAL SURFACE HAVING A PHOSPHATE CONVERSION COATING THEREON, COMPRISING APPLYING TO THE SURFACE AN AQUEOUS COMPOSITION CONSISTING ESSENTIALLY OF WATER AT LEAST .05 GRAMS/LITER OF ZIRCONIUM, EXPRESSED AS ZRO2, WHEREIN THE SOURCE FOR THE ZIRCONIUM IN SAID COMPOSITION IS A WATER SOLUBLE ZIRCONIUM COMPOUND, AND A STABILIZING AGENT SELECTED FROM THE GROUP CONSISTING OF GLUCONIC ACID AND SALTS THEREOF, AND CITRIC ACID AND SALTS THEREOF, PRESENT IN AN AMOUNT SUCH THAT FOR EACH PART BY WEIGHT OF ZIRCONIUM THERE IS AT LEAST .5 PARTS BY WEIGHT OF STABILIZING AGENT; AND WHEREIN THE PH OF THE COMPOSITION IS WITHIN THE RANGE OF FROM ABOUT 3 TO ABOUT 8.5.
Claim 3
Dependent Claim
23 words
A method according to claim 1 wherein the concentration of zirconium is from about .05 grams/liter to about 3 grams/liter, expressed as ZrO2.
Claim 4
Dependent Claim
36 words
A method according to claim 1 wherein the water soluble zirconium compound is selected from the group consisting of a) zirconium carboxylate, b) alkali metal and ammonium zirconium hydroxy carboxylate, c) alkali metal and ammonium fluozirconate.
Claim 5
Independent Claim
126 words
A method for rinsing a metal surface coated with a phosphate conversion coating, comprising applying to the surface an aqueous composition consisting essentially of water, from about .05 grams/liter to about 3 grams/liter of zirconium, expressed as ZrO2, wherein the source for the zirconium in said composition is a water soluble zirconium compound, and a stabilizing agent selected from the group consisting of gluconic acid, citric acid, and salts thereof, in an amount such that for each part by weight of zirconium there is at least .5 parts by weight of stabilizing agent, and wherein the pH of the composition is within the range of from about 3 to about 8.5, thereafter rinsing the surface with water and then depositing a paint finish on the surface.
Claim 6
Independent Claim
126 words
A method for rinsing a metal surface coated with a phosphate conversion coating, comprising applying to the surface an aqueous composition consisting essentially of water, from about .05 grams/liter to about 3 grams/liter of zirconium, expressed as ZrO2, wherein the source for the zirconium in said composition is a water soluble zirconium compound, and a stabilizing agent selected from the group consisting of gluconic acid, citric acid, and salts thereof, in an amount such that for each part by weight of zirconium there is at least .5 parts by weight of stabilizing agent, and wherein the pH of the composition is within the range of from about 3 to about 8.5, thereafter rinsing the surface with water and then depositing a paint finish on the surface.
Claim 7
Dependent Claim
18 words
The method according to claim 4 wherein the surface is dried prior to depositing the paint finish thereon.
Claim 8
Dependent Claim
13 words
The method according to claim 4 wherein the paint finish is electrophoretically deposited.
Claim 9
Dependent Claim
13 words
The method according to claim 4 wherein the zirconium compound is zirconium acetate.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |