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

C - Chemistry – Metallurgy – 23 – C

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

Patent

CA 2672871

The invention provides a surface pretreatment fluid for the metal substrate to be coated by cationic electrodeposition which makes it possible to attain satisfactory throwing power in the electrodeposition and which is excellent in corrosion inhibition performance. A surface pretreatment fluid for the metal to be coated by cationic electrodeposition which contains zirconium ions, copper ions and other metal ions and has a pH of 1.5 to 6.5, wherein the above other metal ions are at least one kind of ions selected from the group consisting of tin ion, indium ion, aluminum ion, niobium ion, tantalum ion, yttrium ion, and cerium ion, and the zirconium ion concentration is 10 to 10000ppm with the concentration ratio of copper ion to zirconium ion and that of other metal ion to copper ion being 0.005 to 1 by mass and 0.1 to 1000 by mass respectively.

L'invention concerne un fluide de prétraitement de surface pour un substrat métallique devant être revêtu par électrodéposition cationique, qui permet d'obtenir un pouvoir de pénétration satisfaisant dans l'électrodéposition et qui 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, des ions cuivre et autres ions métalliques et ayant un pH de 1,5 à 6,5, les autres ions métalliques ci-dessus étant au moins une sorte d'ions choisis dans le groupe constitué par les ions étain, les ions indium, les ions aluminium, les ions niobium, les ions tantale, les ions yttrium et les ions cérium, et la concentration en ions zirconium étant de 10 à 10 000 ppm avec le rapport de concentration des ions cuivre aux ions zirconium et celui des autres ions métalliques aux ions cuivre étant respectivement de 0,005 à 1 en masse et de 0,1 à 1 000 en masse.

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