C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/34 (2006.01) C23C 22/36 (2006.01) C23C 22/60 (2006.01) C23C 22/66 (2006.01) C23C 22/68 (2006.01)
Patent
CA 2402007
The invention relates to a method for treating vehicle bodies or household appliances with an at least partially metallic surface, in such a way as to protect them from corrosion. Said metallic surface should consist of at least 90 % zinc, aluminium and/or magnesium and/or alloys of these metals with each other or with other alloy components, in relation to the metallic surface. According to said method, the vehicle bodies or household appliances are cleaned, passivated and coated. The invention is characterised in that for the purpose of passivation, the vehicle bodies or household appliances are brought into contact with an aqueous solution which has a pH-value of 1 to 12 and which contains such a quantity of complex fluorides of Ti, Zr, Hf, Si and/or B that the content of Ti, Zr, Hf, Si and/or B is 20 to 500 mg/l, and 50 to 2000 mg/l organic polymers, the composition of the aqueous solution being selected with a view to preventing the formation of a crystalline phosphate layer containing zinc on the metallic surface.
L'invention concerne un procédé pour effectuer un traitement anticorrosion sur des carrosseries automobiles ou des appareils électroménagers présentant au moins partiellement une surface métallique dont au moins 90 % est constituée de zinc, d'aluminium et/ou de magnésium et/ou d'alliages de ces métaux entre eux ou avec d'autres constituants d'alliage. Selon ce procédé, on nettoie les carrosseries automobiles ou les appareils électroménagers, avant de leur faire subir une passivation et d'appliquer sur eux une couche de revêtement. L'invention est caractérisée en ce que, pour réaliser la passivation, on met les carrosseries automobiles ou les appareils électroménagers en contact avec une solution aqueuse qui présente un pH compris entre 1 et 12 et qui contient des fluorures complexes de Ti, Zr, Hf, Si et/ou B dans des proportions telles que la teneur en Ti, Zr, Hf, Si et/ou B est comprise entre 20 et 500 mg/l, ainsi que 50 à 2000 mg/l de polymères organiques. La composition de la solution aqueuse est choisie de sorte qu'aucune couche cristalline de phosphate renfermant du zinc ne se forme sur la surface métallique.
Quellhorst Heike
Schenzle Bernd
Wichelhaus Winfried
Henkel Ag & Co. Kgaa
Henkel Kommanditgesellschaft Auf Atkien
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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