EP 1492902 A4 20050615 - COMPOSITION AND PROCESS FOR THE TREATMENT OF METAL SURFACES

Title (en)

COMPOSITION AND PROCESS FOR THE TREATMENT OF METAL SURFACES

Title (de)

ZUSAMMENSETZUNG UND VERFAHREN ZUR BEHANDLUNG VON METALLOBERFLÄCHEN

Title (fr)

COMPOSITION ET PROCEDE DE TRAITEMENT DE SURFACES METALLIQUES

Publication

EP 1492902 A4 20050615 (EN)

Application

EP 03708992 A 20030207

Priority

US 0303610 W 20030207
US 9976902 A 20020314

Abstract (en)

[origin: WO03078682A1] A method of forming a conversion layer on a metallic surface and a composition usable in the method are provided. The composition is an aqueous solution comprising a source of tungstate ions and a soluble material comprising zirconium. The method provides a conversion coating on a surface that can then be painted or otherwise treated. The conversion coatings of the present invention are minimally affected by heating and/or baking, unlike chromate conversion coatings of the prior art.

IPC 1-7

C23C 22/48; C23C 22/40; C23C 22/44

IPC 8 full level

C23C 22/40 (2006.01); C23C 22/42 (2006.01); C23C 22/44 (2006.01)

CPC (source: EP US)

C23C 22/40 (2013.01 - EP US); C23C 22/44 (2013.01 - EP US)

Citation (search report)

[XY] US 4264378 A 19810428 - OPPEN DIETER, et al
[X] WO 9315154 A1 19930805 - HENKEL CORP [US]
[X] WO 0148264 A1 20010705 - HENKEL CORP [US], et al
[X] WO 0186016 A2 20011115 - HENKEL CORP [US], et al
[X] US 5919318 A 19990706 - BRANDS KARL-DIETER [DE], et al
[Y] US 5143562 A 19920901 - BOULOS MERVET S [US]
See references of WO 03078682A1

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR

DOCDB simple family (publication)

WO 03078682 A1 20030925; AU 2003212949 A1 20030929; CN 100378246 C 20080402; CN 1643181 A 20050720; EP 1492902 A1 20050105; EP 1492902 A4 20050615; JP 2005520047 A 20050707; TW 200303934 A 20030916; TW I255863 B 20060601; US 2003172998 A1 20030918

DOCDB simple family (application)

US 0303610 W 20030207; AU 2003212949 A 20030207; CN 03805827 A 20030207; EP 03708992 A 20030207; JP 2003576672 A 20030207; TW 92102988 A 20030213; US 9976902 A 20020314