IP Library › Granted Patent US 7,491,274
Granted Patent B2
US 7,491,274 · App. 10/977,587 · Granted Feb 17, 2009

Non-chrome metal treatment composition

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Quick Facts
Patent No.
US 7,491,274
App. No.
10/977,587
Granted
Feb 17, 2009
Kind
B2
Abstract

Chromate-free treatments and compositions for applying a conversion or passivation coating for metals, more particularly zinc coated metal surfaces. The methods of the invention comprise contacting the requisite metal surface with a phosphonomethylated polyamine. Other aspects of the invention involve methods and compositions in which the following optional components can be included: fluoacid, silane, inorganic phosphorus, acid, latex film forming component and pH adjustment agent.

Claims (11)

1. A method of forming a conversion or passivation coating on a metal surface comprising contacting said metal surface with an aqueous treatment composition comprising (a) a phosphonomethylated polyamine.

2. A method of forming a conversion or passivation coating on a metal surface comprising contacting said metal surface with an aqueous treatment composition comprising (a) a phosphonomethylated polyamine, (b) a fluoacid, (c) a silane, and (d) an inorganic phosphorus acid.

3. A method as recited in claim 2 wherein said metal surface is a zinc coated metal surface.

4. A method as recited in claim 2 wherein said metal surface is galvanized steel.

5. A method as recited in claim 2 wherein said metal surface is zinc-aluminum alloy steel.

6. A method as recited in claim 2 wherein said aqueous treatment composition is chromate free.

7. A method as recited in claim 2 wherein said fluoacid (b) is H2TiF 6 .

8. A method as recited in claim 2 wherein said inorganic phosphorus acid (d) is H 3 PO 4 .

9. A method as recited in claim 2 wherein said silane (c) is an aminosilane or an alkoxysilane.

10. A method of treating a metal surface to form a conversion or passivation coating of greater than about 1 mg per square foot on said surface, said method comprising contacting said metal surface with an aqueous treatment composition comprising: (a) phosphonomethylated polyamine, (b) a fluoacid, (c) a silane, and (d) an inorganic phosphorus acid.

11. Method as recited in claim 10 wherein said metal surface is a galvanized steel surface.

Assignments (4)
TERMINATION AND RELEASE OF SECURITY INTEREST IN PATENTS FILED AT R/F 025795/0690 Recorded Oct 1, 2013
From: CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH, AS ADMINISTRATIVE AGENT
To: CHEMETALL CORPORATION
Reel/Frame 031324/0871 →
SECURITY AGREEMENT Recorded Feb 15, 2011
From: CHEMETALL CORPORATION
To: CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH, AS ADMINISTRATIVE AGENT
Reel/Frame 025795/0690 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 22, 2008
From: GE BETZ, INC.; GENERAL ELECTRIC COMPANY; GE BETZ INTERNATIONAL, INC.
To: CHEMETALL CORP.
Reel/Frame 020393/0450 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 15, 2005
From: CAREY, WILLIAM S.; RAAB, MICHAEL T.; SZWAJKOWSKI, EDMUND P.; MELZER, JEFFREY I.
To: GENERAL ELECTRIC COMPANY
Reel/Frame 015900/0612 →