# US 9,039,845 B2 · Trivalent chromium passivation and pretreatment composition and method for zinc-containing metals

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- Number: US 9,039,845 B2
- Document ID: US9039845B2
- Status: Granted
- Kind: B2
- Application number: 12/612,362
- Filed: 2009-11-04
- Published: 2011-05-05
- Granted: 2015-05-26
- Earliest claimed: 2009-11-04
- Assignees: Bulk Chemicals, Inc.
- Applicants: Ted M. Schlosser; Edward M. Musingo
- Inventors: Ted M. Schlosser; Edward M. Musingo
- Web page: https://patentgrep.com/patent/US9039845B2

## CPC

- C23C 22/07: containing phosphates
- C23C 22/34: containing fluorides or complex fluorides
- C23C 22/53: Treatment of zinc or alloys based thereon
- C23C 22/78: Pretreatment of the material to be coated
- C23C 22/82: After-treatment
- C23C 2222/10: Use of solutions containing trivalent chromium but free of hexavalent chromium
- C23C 2222/20: Use of solutions containing silanes
- 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)

## Abstract

Aqueous compositions useful as pretreatments prior to painting and to prevent the formation of white rust in the uncoated condition include an organopolyphosphonic acid or salt thereof, an organosilane, and a trivalent chromium compound. A method for treating a surface of a zinc-containing metal includes contacting the surface with an aqueous composition including an organopolyphosphonic acid or salt thereof, an organosilane, and a trivalent chromium compound. The composition may also include an agent for reducing hydrophilicity, such as a polyacrylic acid. The aqueous composition has been found to be particularly well-suited for treating a zinc-containing metal to passivate the surface, improve paint adhesion, and/or improve corrosion resistance.

## Claims

### Claim 1

An aqueous composition for treating a surface of a zinc-containing metal, said composition comprising an organopolyphosphonic acid or salt thereof, polyalkyleneoxidealkoxysilane, and a trivalent chromium compound.

### Claim 2 (depends on 1)

The aqueous composition of claim 1 further comprising an agent for reducing hydrophilicity.

### Claim 3 (depends on 2)

The aqueous composition of claim 2, wherein the agent for reducing hydrophilicity is polyacrylic acid.

### Claim 4 (depends on 1)

The aqueous composition of claim 1, wherein the organopolyphosphonic acid or salt thereof is a bisphosphonic acid or salt thereof.

### Claim 5 (depends on 1)

The aqueous composition of claim 1, wherein the organopolyphosphonic acid or salt thereof is etidronic acid.

### Claim 6 (depends on 1)

The aqueous composition of claim 1, wherein the trivalent chromium compound is selected from the group consisting of chromium (III) trifluoride, chromium (III) nitrate, chromium (III) gluconate, and chromium (III) fluozirconate.

### Claim 7 (depends on 6)

The aqueous composition of claim 6, wherein the trivalent chromium compound is chromium (III) fluozirconate.

### Claim 8 (depends on 1)

The aqueous composition of claim 1, wherein the trivalent chromium compound is present in an amount of about 55.0 to about 220.0 g/L.

### Claim 9 (depends on 1)

The aqueous composition of claim 1, wherein the trivalent chromium compound is present in an amount of about 77.0 to about 165.0 g/L.

### Claim 10 (depends on 1)

The aqueous composition of claim 1, wherein polyalkyleneoxidealkoxysilane is present in an amount of about 11.0 to about 55.0 g/L.

### Claim 11 (depends on 1)

The aqueous composition of claim 1, wherein polyalkyleneoxidealkoxysilane is present in an amount of about 16.5 to about 33.0 g/L.

### Claim 12 (depends on 1)

The aqueous composition of claim 1, wherein the organopolyphosphonic acid or salt thereof is present in an amount of about 33.0 to about 110.0 g/L.

### Claim 13 (depends on 1)

The aqueous composition of claim 1, wherein the organopolyphosphonic acid or salt thereof is present in an amount of about 55.0 to about 88.0 g/L.