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US 4,728,456 AGranted
Aluminum surface cleaning agent
AssigneeAmchem Products, Inc.
InventorsKatsuyoshi Yamasoe, Kiyotado Yasuhara, Satoshi Ikeda
Life of this patent
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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.
Claims11
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.
1 more element
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.
4 more elements
Dependencies are inferred from the claim text.