US3635826A
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Compositions and methods for treating metal surfaces
Assignee: Henkel Corp
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Filing: 1969-11-03
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Granted: 1972-01-18
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Expires: 1989-11-03
Abstract
Abstract Acidic solutions having as an acidic component phosphoric acid and sulfuric acid, as a surfactant component a mixture of primary ethoxylated alcohol and modified polyethoxylated straight chain alcohol, and as a sequestrant component a mixture of oxalic acid and citric acid, are useful in cleaning aluminum, especially drawn and ironed aluminum cans coated with drawing oil, in cleaning, deoxidizing and brightening stainless steel, and in forming corrosion resistant and paint adherent iron phosphate coatings on ferriferous surfaces when applied thereto by the reverse roll coat method.
Inventors
- 👤 Andrew J Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:56
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/08; C23G1/088; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/46; C23C22/47; C23G1/12; C23G1/125
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
41 words
A composition according to claim 1 in which the volume ratio of sulfuric acid and phosphoric acid in said acid component is between about 0.8 to 1 and about 1.2 to 1, (calculated as 66* B. sulfuric acid/75 percent phosphoric acid).
Claim 2
Dependent Claim
22 words
A composition according to claim 1 in which said surfactant component consists of primary ethoxylated alcohol and modified polyethoxylated straight chain alcohol.
Claim 3
Dependent Claim
31 words
A composition according to claim 3 in which the weight ratio of primary ethoxylated to modified polyethoxylated straight chain alcohol is between about 2.25 to 1 to about 1.75 to 1.
Claim 4
Dependent Claim
15 words
A composition according to claim 1 and further comprising about 1 percent tri ethylene glycol.
Claim 5
Dependent Claim
86 words
A concentrate useful upon dilution with water for treatment of metal surfaces consisting essentially of an aqueous solution containing about 11 percent by weight phosphoric acid (calculated as 75 percent phosphoric acid), about 12.8 percent by weight sulfuric acid (calculated as 66* B. sulfuric acid), about 8.0 percent by weight primary ethoxylated alcohol, about 4.6 percent modified polyethoxylated straight chain alcohol, about 2.0 percent by weight oxalic acid (calculated as oxalic acid dihydrate) and about 4.2 percent by weight citric acid (calculated as anhydrous citric acid).
Claim 6
Dependent Claim
15 words
A concentrate according to claim 6 and further containing about 1 percent tri ethylene glycol.
Claim 7
Dependent Claim
129 words
A solution for cleaning aluminum surfaces comprising an aqueous solution consisting essentially of: an acid component consisting of sulfuric acid and phosphoric acid in a volume ratio of from about 0.5 to 1 to about 1.5 to 1, (calculated as 66* B. sulfuric acid/75 percent phosphoric acid), the concentration of said acid component being between about 0.001 percent and about 0.005 percent by weight, a surfactant component in an amount between about 0.0010 percent and 0.0035 percent by weight, and a sequestrant component consisting of oxalic acid and citric acid in a weight ratio of from about 2.25 to 1 to about 1.75 to 1 (calculated as oxalic acid dihydrate/anhydrous citric acid), the concentration of said sequestrant component being between about 0.001 percent and about 0.002 percent by weight.
Claim 8
Dependent Claim
26 words
A solution in accordance with claim 8 in which the concentration of said acid component is between about 0.0025 percent and about 0.0035 percent by weight.
Claim 9
Dependent Claim
37 words
A solution in accordance with claim 8 in which the surfactant component consists of primary ethoxylated alcohol and modified polyethoxylated straight chain alcohol in a ratio of from about 2.25 to 1 to about 1.75 to 1.
Claim 10
Dependent Claim
26 words
A solution in accordance with claim 8 in which the concentration of said sequestrant component is between about 0.0012 percent and about 0.0015 percent by weight.
Claim 11
Dependent Claim
133 words
A solution for cleaning deoxidizing and brightening stainless steel comprising an aqueous solution consisting essentially of: an acid component consisting of sulfuric acid and phosphoric acid in a volume ratio of from about 0.5 to 1 to about 1.5 to 1, (calculated as 66* B. sulfuric acid/75 percent phosphoric acid), the concentration of said acid component being between about 0.003 percent and about 0.015 percent by weight, a surfactant component in an amount between about 0.003 percent and about 0.007 percent by weight, and a sequestrant component consisting of oxalic acid anD citric acid in a weight ratio of from about 2.25 to 1 to about 1.75 to 1 (calculated as oxalic acid dihydrate/anhydrous citric acid), the concentration of said sequestrant component being between about 0.0006 percent and about 0.0060 percent by weight.
Claim 12
Dependent Claim
26 words
A solution in accordance with claim 12 in which the concentration of said acid component is between about 0.004 percent and about 0.0075 percent by weight.
Claim 13
Dependent Claim
37 words
A solution in accordance with claim 12 in which the surfactant component consists of primary ethoxylated alcohol and modified polyethoxylated straight chain alcohol in a ratio of from about 2.25 to 1 to about 1.75 to 1.
Claim 14
Dependent Claim
135 words
A solution for applying an iron phosphate coating to ferriferous surfaces comprising an aqueous solution consisting essentially of: an acid component consisting of sulfuric acid and phosphoric acid in a volume ratio of from about 0.5 to 1 to about 1.5 to 1, (calculated as 66* B. sulfuric acid/75 percent phosphoric acid), the concentration of said acid component being between about 0.0015 percent and about 0.015 percent by weight, a surfactant component in an amount between about 0.0013 percent and about 0.013 percent by weight, and a sequestrant component consisting of oxalic acid and citric acid in a weight ratio of from about 2.25 to 1 to about 1.75 to 1 (calculated as oxalic acid dihydrate/anhydrous citric acid), the concentration of said sequestrant component being between about 0.0006 percent and about 0.0060 percent by weight.
Claim 15
Dependent Claim
65 words
A solution in accordance with claim 15 in which the concentration of said acid component is between about 0.0075 percent and and about 0.0105 percent by weight. 17 A solution in accordance with claim 15 in which the surfactant component consists of primary ethoxylated alcohol and modified polyethoxylated straight chain alcohol in a ratio of from about 2.25 to 1 to about 1.75 to 1.
Claim 16
Independent Claim
138 words
A method for cleaning aluminum surfaces comprising contacting said surfaces with an aqueous solution consisting essentially of: an acid component consisting of sulfuric acid and phosphoric acid in a volume of from about 0.5 to 1 to about 1.5 to 1, (calculated as 66* B. sulfuric acid/75 percent phosphoric acid), the concentration of said acid component being between about 0.001 percent and about 0.005 percent by weight, a surfactant component in an amount between about 0.0010 percent and about 0.0035 percent by weight, and a sequestrant component consisting of oxalic acid and citric acid in a weight ratio of from about 2.25 to 1 to about 1.75 to 1, (calculated as oxalic acid dihydrate/anhydrous citric acid), the concentration of said sequestrant component being between about 0.001 percent and about 0.002 percent by weight, and thereafter rinsing said surfaces.
Claim 17
Independent Claim
138 words
A method for cleaning deoxidizing and brightening stainless steel surfaces comprising contacting said surfaces with an aqueous solution consisting essentially of: an acid component consisting of sulfuric acid and phosphoric acid in a volume ratio of from about 0.5 to 1 to about 1.5 to 1, (calculated as 66* B. sulfuric acid/75 percent phosphoric acid), the concentration of said acid component being between about 0.003 percent and about 0.0015 percent by weight, a surfactant component in an amount between about 0.003 percent and about 0.007 percent by weight, and a sequestrant component consisting of oxalic acid and citric acid in a weight ratio of from about 2.25 to 1 to about 1.75 to 1, (calculated as oxalic acid dihydrate/anhydrous citric acid), the concentration of said sequestrant component being between about 0.0006 Percent and about 0.0060 percent by weight.
Claim 18
Independent Claim
162 words
A method for applying an iron phosphate coating to ferriferous surfaces comprising applying by a reverse contact roll to a moving ferriferous surface and an aqueous solution consisting essentially of: an acid component consisting of sulfuric acid and phosphoric acid in a volume ratio of from about 0.5 to 1 to about 1.5 to 1, (calculated as 66* B. sulfuric acid/75 percent phosphoric acid), the concentration of said acid component being between about 0.0015 percent and about 0.015 percent by weight, a surfactant component in an amount between about 0.0013 percent and about 0.013 percent by weight, and a sequestrant component consisting of oxalic acid and citric acid in a weight ratio of from about 2.25 to 1 to about 1.75 to 1, (calculated as oxalic acid dihydrate/ anhydrous citric acid), the concentration of said sequestrant component being between about 0.0006 percent and about 0.0060 percent by weight, and allowing said solution to dwell on said surface for at least 5 seconds.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |