Method for phosphatizing zinc or aluminium surfaces

Details Method for phosphatizing zinc or aluminium surfaces Method for phosphatizing zinc or aluminium surfaces

C - Chemistry, Metallurgy

23

C

C23C 22/18 (2006.01) C23C 22/13 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2362556

The invention relates to a method for phosphatizing zinc or aluminium surfaces with a phosphatizing solution containing 0.5 to 2.0 g/l Zn2+, 0.3 to 2.0 g/l Ni2+, 0.1 to 0.4 g/l NH2OH, at least 3.0 g/l NO3- and 10.0 to 20.0 g/l phosphate (calculated as P2O5). Said solution is applied to the surfaces by immersion or spraying at 35 to 75 ~C, the immersion time being 0.5 to 10 minutes and the spraying time being 3 seconds to 5 minutes.

L'invention concerne un procédé pour la phosphatisation de surfaces en zinc ou en aluminium à l'aide d'une solution de phosphatisation contenant 0,5 à 2,0 g/l de Zn?2+¿, 0,3 à 2,0 g/l de Ni?2+¿, 0,1 à 0,4 g/l de NH¿2?OH, au moins 3,0 g/l de NO¿3??-¿ et 10,0 à 20,0 g/l de phosphate (calculé comme P¿2?O¿5?). Cette solution est appliquée sur les surfaces par immersion ou par projection à une température allant de 35 à 75 ·C. Le procédé selon l'invention est caractérisé en ce que le temps d'immersion est compris entre 0,5 et 10 minutes et que le temps de projection est compris entre 3 secondes et 5 minutes.

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