Zinc phosphating with integrated subsequent passivation

Details Zinc phosphating with integrated subsequent passivation Zinc phosphating with integrated subsequent passivation

C - Chemistry, Metallurgy

23

C

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

Patent

CA 2256695

A process for phosphating the surface of steel, galvanised or alloy-galvanised steel, aluminium and/or aluminium-magnesium alloys, in which the phosphating solution contains 0.2 to 3 g/l zinc ions, 3 to 50 g/l phosphate ions calculated as PO4, 0.001 to 4 g/l manganese ions, 0.001 to 0.5 g/l of one or more polymers selected from among polyethers, polycarboxylates, polymeric phosphonic acids, polymeric phosphino carboxylic acids and nitrogen-containing organic polymers and one or more accelerators. Preferred polymers are amino group-containing poly(vinyl phenol) derivatives.

L'invention concerne un procédé de phosphatation de surfaces métalliques en acier, en acier galvanisé ou en acier allié galvanisé, en aluminium et/ou en alliages aluminium-magnésium, qui se caractérise en ce que la solution de phosphatation contient entre 0,2 et 3 g/l d'ions de zinc, entre 3 et 50 g/l d'ions de phosphate, exprimé sous forme de PO¿4?, entre 0,001 et 4 g/l d'ions de manganèse, entre 0,001 et 0,5 g/l d'un ou de plusieurs polymères choisis parmi des polyéthers, des polycarboxylates, des acides phosphoniques polymères, des acides carboxyliques phosphiniques et des polymères organiques azotés, et un ou plusieurs accélérateurs. On utilise de préférence comme polymères des dérivés de poly(vinylphénol) contenant des groupes amino.

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