Process for a passivating postrinsing of phosphate layers

Details Process for a passivating postrinsing of phosphate layers Process for a passivating postrinsing of phosphate layers

C - Chemistry, Metallurgy

23

C

148/17

C23C 22/34 (2006.01) C23C 22/06 (2006.01) C23C 22/78 (2006.01) C23C 22/83 (2006.01)

Patent

CA 2018631

In a process for a passivating postrinsing of phosphate layers on metals before the application of a paint or adhesive, aqueous solutions are employed which have been adjusted to a pH value of 3 to 5 and which contain an aluminum fluorozirconate in which the Al:Zr:F mole ratio is (0.15 to 0.65):1:(5 to 7), and in which solutions the total concentration of Al + Zr + F is 0.1 to 2.0 g/l, preferably 0.2 to 0.8 g/l. the postrinsing solutions may additionally contain at least one of the anions benzoate, caprylate, ethyl hexoate, salicylate in a total concentration of 0.05 to 0.5 g/l and may preferably be adjusted to the required pH value with cations of volatile bases, such as ammonium, ethanolammonium and di- and triethanolammonium. The paint is subsequently applied suitably by cathodic electrocoating or powder coating or from a low-solvent high-solids paint.

Dans un procédé pour post-rinçage-passivation de couches de phosphate sur des métaux avant l'application d'une peinture ou d'un adhésif, on utilise des solutions aqueuses dont le pH a été ajusté à une valeur de 3 à 5, et qui renferment un fluorozirconate d'aluminium, dans lequel le rapport molaire Al:Zr:F est de (0,15 à 0,65):1:(5 à 7), et où la concentration totale de Al + Zr + F est de 0,1 à 2,0 g/l, et préférablement 0,2 à 0,8 g/l. De plus, les solutions de post-rinçage peuvent contenir au moins l'un des anions benzoate, caprylate, éthylhexoate, salicylate, à une concentration totale de 0,05 à 0,5 g/l, et seront préférablement ajustées au pH requis à l'aide de cations de bases volatiles, comme les cations ammonium, éthanolammonium ainsi que di- et triéthanolammonium. La peinture est ensuite appliquée par électrodéposition cathodique ou revêtement en poudre, ou encore à partir d'un produit pauvre en solvant mais riche en solides.

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