Surface pretreatment fluid for the metal to be coated by...

Details Surface pretreatment fluid for the metal to be coated by... Surface pretreatment fluid for the metal to be coated by...

C - Chemistry, Metallurgy

23

C

C23C 22/06 (2006.01) C23C 22/34 (2006.01) C23C 28/00 (2006.01) C25D 13/20 (2006.01)

Patent

CA 2672854

The invention provides a zirconium ion containing surface pretreatment fluid for the metal to be coated by cationic electrodeposition which makes it possible to develop satisfactory throwing power in the electrodeposition and is excellent in corrosion inhibition performance. The invention relates to a surface pretreatment fluid for the metal to be coated by cationic electrodeposition which contains zirconium ions and tin ions and has a pH of 1.5 to 6.5, wherein the zirconium ion concentration is 10 to 10000ppm and the content ratio by mass of tin ion to zirconium ion is 0.005 to 1. The fluid may further contain a polyamine, copper ion, fluoride ion, or a chelate compound.

L'invention concerne un fluide de prétraitement de surface contenant des ions zirconium pour un métal devant être revêtu par électrodéposition cationique, qui permet de développer un pouvoir de pénétration satisfaisant dans l'électrodéposition et a une excellente performance d'inhibition de la corrosion. L'invention porte sur un fluide de prétraitement de surface pour un métal devant être revêtu par électrodéposition cationique, ledit fluide contenant des ions zirconium et des ions étain et ayant un pH de 1,5 à 6,5, la concentration en ions zirconium étant de 10 à 10 000 ppm et le rapport massique de la teneur en ions étain à la teneur en ions zirconium étant de 0,005 à 1. Le fluide peut en outre contenir une polyamine, des ions cuivre, des ions fluor ou un composé chélate.

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