US4886616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum surface cleaning agent
Assignee: Henkel Corp
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Filing: 1987-07-31
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Granted: 1989-12-12
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Expires: 2007-07-31
Abstract
Abstract Chromium free cleaning compositions for cleaning aluminum arrd aluminum alloy surfaces comprisingA. from 0.2-4 g/l ferric ion andB. 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 12:19
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/12; C23G1/125
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
48 words
An aqueous chromium free, fluoride free cleaning composition for aluminum and aluminum alloy surfaces consisting of: A. from about 0.2 to about 4 g/l of ferric ions; and B. a sufficient quantity of sulfuric and/or nitric acid to produce a pH of 2 or less for the composition.
Claim 2
Dependent Claim
48 words
An aqueous chromium free, fluoride free cleaning composition for aluminum and aluminum alloy surfaces consisting of: A. from about 0.2 to about 4 g/l of ferric ions; and B. a sufficient quantity of sulfuric and/or nitric acid to produce a pH of 2 or less for the composition.
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
92 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, fluoride free cleaning solution consisting of: A. from about 0.2 to about 4 g/l of ferric ions, and B. a sufficient quantity of sulfuric and/or nitric acid to produce a pH of 2 or less for the composition; and II. removing the aqueous cleaning solution from the aluminum or aluminum alloy surface.
Claim 6
Dependent Claim
92 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, fluoride free cleaning solution consisting of: A. from about 0.2 to about 4 g/l of ferric ions, and B. a sufficient quantity of sulfuric and/or nitric acid to produce a pH of 2 or less for the composition; and II. removing the aqueous cleaning solution from the aluminum or aluminum alloy surface.
Claim 7
Dependent Claim
13 words
A process in accordance with claim 4, wherein component I.B. is sulfuric acid.
Claim 8
Dependent Claim
25 words
A process in accordance with claim 4 wherein the pH of the cleaning solution is in the range of from about 0.6 to about 2.0.
Claim 9
Dependent Claim
57 words
An aqueous chromium-free, fluoride-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 0.1 to about 10 g/l of a surfactant.
Claim 10
Dependent Claim
57 words
An aqueous chromium-free, fluoride-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 0.1 to about 10 g/l of a surfactant.
Claim 11
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, fluoride-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 0.1 to about 10 g/l of a surfactant; and II. removing the aqueous cleaning solution from the aluminum or aluminum alloy surface.
Claim 12
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, fluoride-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 0.1 to about 10 g/l of a surfactant; and II. removing the aqueous cleaning solution from the aluminum or aluminum alloy surface.
References Cited (Backward Citations)
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Cited
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US3510430A
Cited
US3728188A
Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |