Method for phosphatizing, rerinsing and cathodic...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/00 (2006.01) C23C 22/12 (2006.01) C23C 22/18 (2006.01) C23C 22/36 (2006.01) C23C 22/83 (2006.01) C25D 13/20 (2006.01)

Patent

CA 2339234

The invention relates to a method for the pretreatment of surfaces made of steel, galvanized steel and/or aluminium and/or alloys thereof. According to said method, in a first step the surfaces are phosphatized with a zinc phosphatizing solution having a low nickel content, in a second step the phosphatized surfaces are rerinsed with an aqueous solution containing between 0.001 and 10g/l lithium ions, copper ions and/or silver ions, and in a third step a low-lead, cathodically deposited electro-dipcoating paint is applied which contains no more than 0.05 % by weight lead in relation to the dry substance of the electro-dipcoating paint.

L'invention concerne un procédé pour le traitement préalable de surfaces en acier, en acier galvanisé et/ou en aluminium et/ou leurs alliages, selon lequel, dans une première étape, on procède au phosphatage avec une solution de phosphatage au zinc à faible teneur en nickel, on effectue, au cours d'une deuxième étape, le rinçage ultérieur des surfaces phosphatées avec une solution aqueuse contenant 0,001 à 10 g/l d'ions lithium, cuivre, et/ou argent, et au cours d'une troisième étape du procédé, on applique une solution de trempage électrophorétique se déposant par voie cathodique et à faible teneur en plomb, qui ne contient pas plus de 0,05 % en poids de plomb par rapport à la matière sèche du vernis au trempé.

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