Global Patent Index - EP 1550740 B1

EP 1550740 B1 20110309 - Multiple step conversion coating process

Title (en)

Multiple step conversion coating process

Title (de)

Mehrstufenverfahren zur Konversionsbeschichtung

Title (fr)

Procédé de couche de conversion à plusieurs étapes

Publication

EP 1550740 B1 20110309 (EN)

Application

EP 04028997 A 20041207

Priority

US 74553903 A 20031229

Abstract (en)

[origin: EP1550740A1] A process for the chemical pretreatment, before an organic coating, of composite metal structures that contain aluminum or aluminum alloy portions together with zinc or zinc alloy portions, and steel, galvanized steel and/or alloy-galvanized steel portions, such that the phosphate level and the operating temperature of the zinc phosphate solution is reduced, and the nitrite accelerator level of the solution is increased. The process of the present invention reduces the sludge produced by the process, the temperature at which the process operates, and the need for monitoring the process. Furthermore, the pretreatment process of the present invention forms a conversion layer on all exposed metal surfaces that is suitable as a corrosion-preventing paint substrate, especially before a cathodic electro-dipcoating.

IPC 8 full level

C23C 22/73 (2006.01); C23C 22/36 (2006.01); C23C 22/80 (2006.01)

CPC (source: EP)

C23C 22/365 (2013.01); C23C 22/73 (2013.01); C23C 22/83 (2013.01)

Designated contracting state (EPC)

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

DOCDB simple family (publication)

EP 1550740 A1 20050706; EP 1550740 B1 20110309; AT 501284 T 20110315; CA 2488199 A1 20050629; DE 602004031707 D1 20110421; ES 2360289 T3 20110602; PL 1550740 T3 20110831; US 2005145303 A1 20050707

DOCDB simple family (application)

EP 04028997 A 20041207; AT 04028997 T 20041207; CA 2488199 A 20041122; DE 602004031707 T 20041207; ES 04028997 T 20041207; PL 04028997 T 20041207; US 74553903 A 20031229