US4564397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and process for inhibiting corrosion of ferrous or non-ferrous metal surfaced articles and providing receptive surface for synthetic resin coating compositions
Assignee: Jm Eltzroth & Associates Inc
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Filing: 1984-06-21
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Granted: 1986-01-14
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Expires: 2004-06-21
Abstract
Abstract Phosphate coated ferrous and non-ferrous metal surfaced articles are passivated without treatment by a chromium compound by rinsing with an aqueous solution of urea or a urea derivative, or an acidulated urea or urea derivative in an amount sufficient to form a corrosion resistant barrier on the surface which is receptive to synthetic resinous coating compositions.
Inventors
- 👤 Ross C. Opsahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:00
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
73 words
A process of passivating the surfaces of ferrous and non-ferrous metals which have a coating of zinc phosphate, iron phosphate or manganese-iron phosphate which comprises rinsing said coated surfaces with an aqueous solution of urea, an acidulated urea, or a compound containing a urea moiety in sufficient amount and under conditions so as to form a resistant barrier on said surfaces and coating said corrosion resistant barrier with a synthetic resinous coating composition.
Claim 2
Dependent Claim
73 words
A process of passivating the surfaces of ferrous and non-ferrous metals which have a coating of zinc phosphate, iron phosphate or manganese-iron phosphate which comprises rinsing said coated surfaces with an aqueous solution of urea, an acidulated urea, or a compound containing a urea moiety in sufficient amount and under conditions so as to form a resistant barrier on said surfaces and coating said corrosion resistant barrier with a synthetic resinous coating composition.
Claim 3
Dependent Claim
28 words
A process as claimed in claim 1 in which the aqueous solution applied to the phosphate coated surface of the metal consists essentially of a solution of urea.
Claim 4
Dependent Claim
37 words
A process as claimed in claim 1 in which the aqueous solution applied to the phosphate coated surface of the metal consists essentially of an acidulated urea having a pH within the range of 0.8 to 6.5.
Claim 5
Dependent Claim
33 words
A process as claimed in claim 1 in which the aqueous solution applied to the phosphate coated surface of the metal consists essentially of a solution of urea, calcium nitrate and fluosilicic acid.
Claim 6
Dependent Claim
28 words
A process as claimed in claim 1 in which the coated metal surface is given a final rinse with deionized water and cathodically electrocoated with a primer paint.
Claim 7
Dependent Claim
28 words
A process as claimed in claim 2 in which the coated metal surface is given a final rinse with deionized water and cathodically electrocoated with a primer paint.
Claim 8
Dependent Claim
28 words
A process as claimed in claim 3 in which the coated metal surface is given a final rinse with deionized water and cathodically electrocoated with a primer paint.
Claim 9
Dependent Claim
28 words
A process as claimed in claim 4 in which the coated metal surface is given a final rinse with deionized water and cathodically electrocoated with a primer paint.
Claim 10
Dependent Claim
106 words
A composition in the form of a concentrate prepared by mixing urea, calcium nitrate and a fluosilicic acid solution in proportions corresponding to 200 grams urea, 40 grams calcium nitrate and 100 ml of a 50% by weight fluosilicic acid solution at room temperature followed by diluting with water to a total volume of 500 ml, which composition when further diluted with water to a concentration of 0.1% by weight solids is adapted to be applied as a final rinse over phosphated cold rolled steel, aluminum and galvanized steel so as to form a corrosion resistant barrier coating which is receptive to synthetic resinous coating compositions.
Claim 11
Dependent Claim
106 words
A composition in the form of a concentrate prepared by mixing urea, calcium nitrate and a fluosilicic acid solution in proportions corresponding to 200 grams urea, 40 grams calcium nitrate and 100 ml of a 50% by weight fluosilicic acid solution at room temperature followed by diluting with water to a total volume of 500 ml, which composition when further diluted with water to a concentration of 0.1% by weight solids is adapted to be applied as a final rinse over phosphated cold rolled steel, aluminum and galvanized steel so as to form a corrosion resistant barrier coating which is receptive to synthetic resinous coating compositions.
Claim 12
Dependent Claim
12 words
A coated meal produced in accordance with the process of claim 1.
Claim 13
Dependent Claim
12 words
A coated metal produced in accordance with the process of claim 3.
Claim 14
Dependent Claim
12 words
A coated metal produced in accordance with the process of claim 4.
Claim 15
Dependent Claim
12 words
A coated metal produced in accordance with the process of claim 5.
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) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |