C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/18 (2006.01) C23C 22/36 (2006.01) C23C 22/73 (2006.01)
Patent
CA 2440127
The invention relates to a method for applying a phosphate coating to metallic surfaces by wetting said surfaces with an aqueous acidic phosphatizing solution. Said method is characterized in that the phosphatizing solution contains: from 0.2 up to less than 10 g/l zinc ions, 0.5 to 25 g/l manganese ions and 2 to 300 g/l phosphate ions, calculated as P2O5. In said method, no copper or nickel is added to the phosphatizing solution. The metal parts that have been pre-phosphatized in this manner are then shaped, bonded to other metal parts, welded to other metal parts and/or phosphatized again and optionally are then coated with a coating containing at least one polymer, or with at least one paint layer.
L'invention concerne un procédé d'application d'un revêtement phosphate sur des surfaces métalliques par mouillage de ces surfaces avec une solution de phosphatation acide aqueuse. Ledit procédé est caractérisé en ce que la solution de phosphatation contient 0,2 à moins de 10 g/L d'ions zinc, 0,5 à 25 g/L d'ions manganèse, et 2 à 300 g/L d'ions phosphate, calculé en tant que P2O5, et en ce que la solution de phosphatation n'est pas pourvue de cuivre, ni de nickel. Selon ledit procédé, les éléments métalliques ainsi pré-phosphatés sont ensuite formés, collés à d'autres éléments métalliques, soudés à d'autres éléments métalliques et/ou phosphatés à nouveau, et éventuellement revêtus ultérieurement d'au moins un revêtement contenant un polymère ou d'au moins au moins une couche de vernis.
Bittner Klaus
Kolberg Thomas
Wietzoreck Hardy
Chemetall Gmbh
Robic
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