Aqueous solution and method for phosphatizing metallic surfaces

Details Aqueous solution and method for phosphatizing metallic surfaces Aqueous solution and method for phosphatizing metallic surfaces

C - Chemistry, Metallurgy

23

C

C23C 22/12 (2006.01) C23C 22/13 (2006.01) C23C 22/18 (2006.01)

Patent

CA 2325012

The invention relates to an aqueous solution containing phosphate for producing phosphate layers on metallic surfaces made of iron, steel, zinc, zinc alloys, aluminum or aluminum alloys. Said solution contains 0.3 to 5 g Zn2+ /1, 0.1 to 2 g nitroguanidine/1 and 0.05 to 0.5 g hydroxylamine/1, whereby the S-value is between 0.03 and 0.3, and the ratio of the weight of Zn2+ to P2O5 = 1:5 to 1:30. The invention also relates to a phosphatizing method in which the metallic surfaces are cleaned, then treated with said aqueous solution containing phosphate for a period of 5 seconds to 10 minutes at a temperature ranging from 15 to 70 ~C, and finally, are rinsed with water.

L'invention concerne une solution aqueuse à base de phosphate, servant à réaliser des couches de phosphate sur des surfaces métalliques en fer, en acier, en zinc, en alliages de zinc, en aluminium ou en alliages d'aluminium. Cette solution contient entre 0,3 et 5 g de Zn?2+¿ /l, entre 0,1 et 2 g de nitroguanidine/l et entre 0,05 et 0,5 g d'hydroxylamine/l. La valeur S est comprise entre 0,03 et 0,3 et le rapport en poids de Zn?2+¿ à P¿2?O¿5? = 1:5 à 1:30. L'invention concerne en outre un procédé de phosphatation, selon lequel les surfaces métalliques sont nettoyées, puis traitées avec la solution aqueuse à base de phosphate précitée, pendant 5 à 10 secondes, à une température comprise entre 15 et 70 ·C, avant d'être rincées à l'eau.

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