US4728456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum surface cleaning agent
Assignee: Henkel Corp
•
Filing: 1985-10-30
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Granted: 1988-03-01
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Expires: 2005-10-30
Abstract
Abstract Chromium free cleaning compositions for cleaning aluminum and aluminum alloy surfaces comprising A. from 0.2-4 g/l ferric ion and B. sufficient sulfuric and/or nitric acid to produce a pH of 2 or less. The invention also relates to compositions containing from 0.001-0.5 g/l of fluoride ions.
Inventors
- 👤 Katsuyoshi Yamasoe
- 👤 Kiyotado Yasuhara
- 👤 Satoshi Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:29
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/12; C23G1/125
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
57 words
An aqueous chromium free cleaning composition for aluminum and aluminum alloy surfaces consisting of: A. from about 0.2 to about 4 g/l of ferric ions; B. a sufficient quantity of sulfuric and/or nitric acid to produce a pH of 2 or less for the composition; and C. from about 0.001 to about 0.5 g/l of fluoride ions.
Claim 2
Dependent Claim
57 words
An aqueous chromium free cleaning composition for aluminum and aluminum alloy surfaces consisting of: A. from about 0.2 to about 4 g/l of ferric ions; B. a sufficient quantity of sulfuric and/or nitric acid to produce a pH of 2 or less for the composition; and C. from about 0.001 to about 0.5 g/l of fluoride ions.
Claim 3
Dependent Claim
13 words
A composition in accordance with claim 1 wherein component B is sulfuric acid.
Claim 4
Dependent Claim
24 words
A composition in accordance with claim 1 wherein the pH of the composition is in the range of from about 0.6 to about 2.0.
Claim 5
Dependent Claim
15 words
A composition in accordance with claim 1 wherein the fluoride ion is the F.sup.⊖ ion.
Claim 6
Dependent Claim
16 words
A composition in accordance with claim 1 wherein the fluoride ion is a complex fluoride ion.
Claim 7
Dependent Claim
101 words
A process for cleaning aluminum and aluminum alloy surfaces comprising the steps of I. treating an aluminum or aluminum alloy surface at a temperature in the range of about 20 C. to about 80 C. with an aqueous chromium free cleaning solution consisting of: A. from about 0.2 to about 4 g/l of ferric ions; B. a sufficient quantity of sulfuric and/or nitric acid to produce a pH of 2 or less for the composition; and C. from about 0.001 to about 0.5 g/l of fluoride ions; and II. removing the aqueous cleaning solution from the aluminum or aluminum alloy surface.
Claim 8
Dependent Claim
101 words
A process for cleaning aluminum and aluminum alloy surfaces comprising the steps of I. treating an aluminum or aluminum alloy surface at a temperature in the range of about 20 C. to about 80 C. with an aqueous chromium free cleaning solution consisting of: A. from about 0.2 to about 4 g/l of ferric ions; B. a sufficient quantity of sulfuric and/or nitric acid to produce a pH of 2 or less for the composition; and C. from about 0.001 to about 0.5 g/l of fluoride ions; and II. removing the aqueous cleaning solution from the aluminum or aluminum alloy surface.
Claim 9
Dependent Claim
13 words
A process in accordance with claim 6 wherein component I.B. is sulfuric acid.
Claim 10
Dependent Claim
25 words
A process in accordance with claim 6 wherein the pH of the cleaning solution is in the range of from about 0.6 to about 2.0.
Claim 11
Dependent Claim
17 words
A process in accordance with claim 6 wherein in I.C. the fluoride ion is the F.sup.⊖ ion.
Claim 12
Dependent Claim
18 words
A process in accordance with claim 6 wherein in I.C. the fluoride ion is a complex fluoride ion.
Claim 13
Dependent Claim
55 words
A concentrated composition for dilution with water in accordance with the composition of claim 1 wherein the concentrated composition contains in excess of 4 g/l of ferric ions, and proportional quantities of sulfuric acid and/or nitric acid and fluoride ions so as to result in the composition of claim 5 upon said dilution with water.
References Cited (Backward Citations)
FR1565017A
Cited
US3728188A
Cited
FR2159488A1
Cited
GB1454974A
Cited
US4032359A
Cited
US4089736A
Cited
US4100015A
Cited
US4212701A
Cited
US4339282A
Cited
US4435223A
Cited
US4425185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |