EP 1692325 A1 20060823 - TWO-STAGE CONVERSION TREATMENT
Title (en)
TWO-STAGE CONVERSION TREATMENT
Title (de)
ZWEISTUFIGE KONVERSIONSBEHANDLUNG
Title (fr)
TRAITEMENT DE CONVERSION EN DEUX ETAPES
Publication
Application
Priority
- EP 2004012323 W 20041030
- DE 10358310 A 20031211
Abstract (en)
[origin: WO2005061761A1] The invention relates to a method for the two-stage corrosion prevention treatment of metallic surfaces. According to the inventive method, (a) in a first step, the metallic surface is brought into contact with a chromium-free first aqueous solution having a pH value of between 1.5 and 5, and containing a total of at least 0.01 g/l and up to 10 g/l Ti and/or Si ions, and at least a quantity of fluoride such that the atomic ratio Ti to F and/or Zr to F and/or Si to F is between 1: 1 and 1: 6, and then (b) in a second step, the metallic surface is brought into contact with a chromium-free second aqueous solution having a pH value between 1.5 and 5, containing a total of at least 0.01 g/l and up to 10 g/l Ti and/or Zr and/or Si ions, and at least a quantity of fluoride such that the atom ratio Ti to F and/or Zr to F and/or Si to F is between 1: 1 and 1: 6, and additionally containing such a quantity of soluble anions of oxoacids of molybdenum and/or wolfram in the oxidation stage VI, that the entire concentration of molybdenum and/or wolfram, calculated as MoO4<2- >and/or WO4<2->, is between 5 and 1500 mg/l.
IPC 8 full level
C23C 22/83 (2006.01); B05D 5/00 (2006.01); B05D 7/00 (2006.01); C23C 22/34 (2006.01); C23C 22/44 (2006.01); C23C 22/73 (2006.01)
CPC (source: EP US)
C23C 22/34 (2013.01 - EP US); C23C 22/44 (2013.01 - EP US); C23C 22/73 (2013.01 - EP US); C23C 22/83 (2013.01 - EP US)
Citation (search report)
See references of WO 2005061761A1
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 PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2005061761 A1 20050707; CA 2548975 A1 20050707; CN 1890404 A 20070103; DE 10358310 A1 20050721; EP 1692325 A1 20060823; US 2007017602 A1 20070125
DOCDB simple family (application)
EP 2004012323 W 20041030; CA 2548975 A 20041030; CN 200480036924 A 20041030; DE 10358310 A 20031211; EP 04791077 A 20041030; US 45093306 A 20060609