Chromate treatment or postpassivation with stabilised...

Details Chromate treatment or postpassivation with stabilised... Chromate treatment or postpassivation with stabilised...

C - Chemistry, Metallurgy

23

C

C23C 22/30 (2006.01) C23C 22/33 (2006.01) C23C 22/37 (2006.01) C23C 22/38 (2006.01) C23C 22/83 (2006.01)

Patent

CA 2303101

The invention concerns a method for chromate treatment or postpassivation of a corrosion-resistant coating previously formed, and an aqueous solution for the chromate treatment or postpassivation of steel, zinc-coated or galvanized surfaces by depositing an alloy either of aluminium or of aluminium alloys, containing trivalent or hexavalent chromium, and acetate ions. Said aqueous solution is characterised it has a pH ranging between 3.9 and 5.0, a total chromium content ranging between 0.1 and 10 g/l, a ratio Cr (III): Cr (VI) of the order of 1: 1 to 1: 4 and an acetate ion content of the order of 0.1 to 10 g/l.

L'invention concerne un procédé de chromatation ou de postpassivation d'une couche anticorrosion formée au préalable, ainsi qu'une solution aqueuse pour chromater ou postpassiver des surfaces en acier, en acier zingué ou galvanisé par dépôt d'alliage ou bien en aluminium et en alliages d'aluminium, qui contient du chrome tri- ou hexavalent, ainsi que des ions d'acétate. Cette solution aqueuse se caractérise en ce qu'elle présente un pH compris entre 3,9 et 5,0, une teneur totale en chrome comprise entre 0,1 et 10 g/l, un rapport Cr(III): Cr(VI) de l'ordre de 1: 1 à 1:4 et une teneur en ions d'acétate de l'ordre de 0,1 à 10 g/l.

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