US3850700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and materials for coating metal surfaces
Assignee: Henkel Corp
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Filing: 1971-10-18
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Granted: 1974-11-26
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Expires: 1991-10-18
Abstract
Abstract Zinc phosphate coating solution accelerated with both chlorate and nitrite, and containing fluoride give enhanced corrosion resistance and paint adhesion on steel and galvanized surfaces, particularly passivated galvanized surfaces. Results are further enhanced when the coated surfaces are baked at 300*F to 400*F for 2 to 10 minutes prior to application of electrophoretic paint.
Inventors
- 👤 F Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:54
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/36; C23C22/362; C23C22/73; C23C22/74
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
A METHOD FOR FINISHING ARTICLES HAVING BOTH STEL AND GALVANIZED SURFACES COMPRISING APPLYING A ZINC PHOSPHATE COATING TO SAID SURFACES BY CONTACTING THEM WITH A ZINC PHOSPHATING SOLUTION CONTAINING FROM ABOUT 0.2 TO ABOUT 2.0 GRAMS/LITER CHLORATE, FROM ABOUT 0.03 TO ABOUT 1.0 GRAMS/LITER MITRITE CALCULATED AS NO2, AND FROM ABOUT 0.01 TO ABOUT 5.0 GRAMS/LITER FLUORIDE, CALCULATED AS F, RINSING SAID COATED SURFACE WITH A DILUTE ACIDULATED RINSE, THEREAFTER BAKING SAID COATED AND RENSED SURFACES AT A TEMPERATURE BETWEEN ABOUT 300*F AND ABOUT 400*F FOR ABOUT 2 TO ABOUT 10 MINUTES, AND THEREAFTER APPLYING A PAINT TO SAID SURFACES ELECTROPHORETICALLY.
Claim 2
Independent Claim
101 words
A METHOD FOR FINISHING ARTICLES HAVING BOTH STEL AND GALVANIZED SURFACES COMPRISING APPLYING A ZINC PHOSPHATE COATING TO SAID SURFACES BY CONTACTING THEM WITH A ZINC PHOSPHATING SOLUTION CONTAINING FROM ABOUT 0.2 TO ABOUT 2.0 GRAMS/LITER CHLORATE, FROM ABOUT 0.03 TO ABOUT 1.0 GRAMS/LITER MITRITE CALCULATED AS NO2, AND FROM ABOUT 0.01 TO ABOUT 5.0 GRAMS/LITER FLUORIDE, CALCULATED AS F, RINSING SAID COATED SURFACE WITH A DILUTE ACIDULATED RINSE, THEREAFTER BAKING SAID COATED AND RENSED SURFACES AT A TEMPERATURE BETWEEN ABOUT 300*F AND ABOUT 400*F FOR ABOUT 2 TO ABOUT 10 MINUTES, AND THEREAFTER APPLYING A PAINT TO SAID SURFACES ELECTROPHORETICALLY.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein the concentration of said fluoride is from about 0.1 to about 1.0 grams/liter.
Claim 4
Dependent Claim
24 words
A method according to claim 1 wherein said coated and rinsed surfaces are baked at a temperature of about 350*F for about 5 minutes.
Claim 5
Independent Claim
78 words
A method for finishing articles having both steel and galvanized surfaces comprising applying a zinc phosphate coating to said surfaces by contacting them with a zinc phosphating solution containing from about 0.2 to about 2.0 grams/liter chlorate, from about 0.03 to about 1.0 grams/liter nitrite calculated as NO2, and from about 0.01 to about 5.0 grams/liter fluoride, calculated as F, rinsing said coated surfaces with a dilute acidulated rinse, and thereafter applying a paint to said surfaces electrophoretically.
Claim 6
Independent Claim
78 words
A method for finishing articles having both steel and galvanized surfaces comprising applying a zinc phosphate coating to said surfaces by contacting them with a zinc phosphating solution containing from about 0.2 to about 2.0 grams/liter chlorate, from about 0.03 to about 1.0 grams/liter nitrite calculated as NO2, and from about 0.01 to about 5.0 grams/liter fluoride, calculated as F, rinsing said coated surfaces with a dilute acidulated rinse, and thereafter applying a paint to said surfaces electrophoretically.
Claim 7
Dependent Claim
20 words
A method according to claim 4 wherein the concentration of said fluoride is from about 0.1 to about 1.0 grams/liter.
Claim 8
Independent Claim
66 words
A method for applying a protective coating to articles having both ferriferous and zinciferous surfaces comprising contacting said surfaces with a zinc phosphating solution containing from about 0.2 to about 2.0 grams/liter chlorate, from about 0.03 to about 1.0 grams/liter nitrite calculated as NO2, and from about 0.01 to about 5.0 grams/liter fluoride, calculated as F, and rinsing said coated surfaces with a dilute acidulated rinse.
Claim 9
Independent Claim
66 words
A method for applying a protective coating to articles having both ferriferous and zinciferous surfaces comprising contacting said surfaces with a zinc phosphating solution containing from about 0.2 to about 2.0 grams/liter chlorate, from about 0.03 to about 1.0 grams/liter nitrite calculated as NO2, and from about 0.01 to about 5.0 grams/liter fluoride, calculated as F, and rinsing said coated surfaces with a dilute acidulated rinse.
Claim 10
Dependent Claim
20 words
A method according to claim 6 wherein the concentration of said fluoride is from about 0.1 to about 1.0 grams/liter.
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 |