# US 8,273,190 B2 · Method for making and using chromium III salts

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- Number: US 8,273,190 B2
- Document ID: US8273190B2
- Status: Granted
- Kind: B2
- Application number: 12/474,960
- Filed: 2009-05-29
- Published: 2010-12-02
- Granted: 2012-09-25
- Earliest claimed: 2009-05-29
- Assignees: Bulk Chemicals, Inc.
- Inventors: Jose B. Rivera
- Web page: https://patentgrep.com/patent/US8273190B2

## CPC

- C23C 22/34: containing fluorides or complex fluorides
- C09D 5/084: {Inorganic compounds}
- C25D 3/06: from solutions of trivalent chromium
- C23C 2222/10: Use of solutions containing trivalent chromium but free of hexavalent chromium
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR

## Abstract

A method of preparing an aqueous composition of a chromium III compound, comprising adding hydrogen peroxide to a mixture comprising water and a chromium VI compound in the presence of at least one acid according to the formula H2GF6, in which G is a Group IV-B element. The composition may contain less than 500 ppm of alkali metal ions and less than 200 ppm of halide ions, relative to chromium and may test negative for chromium VI using s-diphenylcarbazide. The composition may be used for treating a metal surface, among other applications.

## Claims

### Claim 1

An aqueous composition comprising dissolved Cr2(GF6)3, in which G is a Group IV-B element, and containing less than 500 ppm of alkali metal ions and less than 200 ppm of halide ions, relative to chromium and which tests negative for chromium VI using s-diphenylcarbazide, wherein the composition contains one or more contaminating ions, and wherein each of said one or more contaminating ions is present at less than 1000 ppm relative to chromium, wherein said one or more contaminating ions are ions that are not part of the canonical formula of Cr2(FG6)3.

### Claim 2 (depends on 1)

The composition of claim 1, wherein G is zirconium.

### Claim 3 (depends on 2)

The composition of claim 2, wherein the aqueous composition has a weight ratio of Zr:Cr in a range from 2.4:1 to 3.0:1.

### Claim 4 (depends on 1)

The composition of claim 1, wherein G is titanium.