Inhibitor for aqueous liquid deoxidizing composition and process

Details Inhibitor for aqueous liquid deoxidizing composition and process Inhibitor for aqueous liquid deoxidizing composition and process

1996-01-29

1997-06-10

Breneman, R. Bruce

Compositions

Etching or brightening compositions

Inorganic acid containing

252 792, 134 3, 216102, 216103, 216104, C09K 1308

Patent

active

056372523

ABSTRACT:
A chromium-and-ferricyanide non-aqueous cleaner/deoxidizer for aluminum, the cleaner/deoxidizer having an etch rate on titanium that is low enough for practical use in processes where aluminum objects to be deoxidized are held on titanium racks or hangers during the process, combines boric acid, fluoborate anions, and an acid that is stronger than either of boric and fluoboric acids, usually also with an oxidizing agent such as hydrogen peroxide. Rates of etching of aluminum that are at least as much as 50 times the rates of etching of titanium under the same conditions can be achieved, and the deoxidizing of the aluminum is satisfactory for achieving corrosion resistance after subsequent conversion coating of the deoxidized aluminum surface.

REFERENCES:
patent: 5052421 (1991-10-01), McMillen

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