Patent US4886616A successfully refreshed from Google Patents.
US4886616A
Expired / Lapsed
US
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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 15:13
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)
FR1417422A
Cited
US3275562A
Cited
US3510430A
Cited
US3728188A
Cited
US3954645A
Cited
US4100015A
Cited
US4212701A
Cited
US4435223A
Cited
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 |