PROCESSES AND COMPOSITIONS FOR IMPROVING CORROSION PERFORMANCE OF ZIRCONIUM OXIDE PRETREATED ZINC SURFACES

Title:

PROCESSES AND COMPOSITIONS FOR IMPROVING CORROSION PERFORMANCE OF ZIRCONIUM OXIDE PRETREATED ZINC SURFACES

Document Type and Number:

WIPO Patent Application WO/2012/109339

Kind Code:

A3

Abstract:

A method of improving corrosion resistance of a metal substrate comprising a zinc surface coated with zirconium oxide conversion coating by, prior to conversion coating, contacting the zinc surface with a composition comprising: a) iron(III) ions, b) a source of hydroxide ion; c) at least one complexing agent selected from organic compounds which have at least one functional group -COOX, wherein X represents either a H or an alkali and/or alkaline earth metal; d) 0.0 to about 4 g/1 cobalt (II) ions; and optionally e) a source of silicate: wherein the composition has a pH of at least 10.

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Inventors:

KAPIC EDIS (US)
GOODREAU BRUCE H (US)
BOBADILLA ALVARO (US)
FEBBRARO MICHAEL (US)

Application Number:

PCT/US2012/024311

Publication Date:

November 22, 2012

Filing Date:

February 08, 2012

Export Citation:

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Assignee:

HENKEL AG & CO KGAA (DE)
KAPIC EDIS (US)
GOODREAU BRUCE H (US)
BOBADILLA ALVARO (US)
FEBBRARO MICHAEL (US)

International Classes:

C23C28/00; C23F11/00; C23G3/02

Foreign References:

US3756864A	1973-09-04
US20100009083A1	2010-01-14
US4801337A	1989-01-31
EP1484432A1	2004-12-08

Other References: