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US 5,393,447 AGranted
Composition and process for desmutting and deoxidizing without smutting
AssigneeHenkel Corporation
InventorsLawrence R. Carlson, Philip M. Johnson
Life of this patent
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Abstract
A chromium and ferricyanide free aqueous deoxidizer/desmutter for aluminum and magnesium alloys contains nitric acid, ferric ions, persulfate, and molybdate and preferably also sulfate, fluoride, and ethoxylated acetylenic diol surfactant.
Claims21
A liquid desmutting/deoxidizing composition of matter consisting essentially of water and:
- (A) nitric acid;
- (B) ferric ions;
- (C) persulfate anions;
- and
- (D) molybdate or condensed molybdate anions.
2 more elements
Dependencies are inferred from the claim text.