Method of coating with lead-free electrodeposition coating...

C - Chemistry – Metallurgy – 09 – D

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C09D 5/44 (2006.01) C09D 7/12 (2006.01) C25D 13/10 (2006.01)

Patent

CA 2519855

The present invention relates to a cationic electrodeposition coating composition substantially free of lead compounds, and more specifically to a method of coating an alloyed hot-dip galvanized steel plate with the composition and a coated article obtained by the method having edge portions and general surfaces excellent in corrosion resistance. The invention provides a method of coating an alloyed hot~dip galvanized steel plate with a lead-free cationic electrodeposition coating composition containing a rust preventive pigment to form an electrodeposition coating film excellent in corrosion resistance, and a coated article obtained by the electrodeposition.

La présente invention concerne un composition de revêtement cationique obtenue par électrodéposition qui est sensiblement exempte de composés au plomb, et plus précisément un procédé permettant d'appliquer ladite composition sur une plaque d'acier allié galvanisé par immersion à chaud ainsi qu'un article ainsi traité dont les bords et les surfaces en général offrent une remarquable résistance à la corrosion. L'invention porte sur un procédé de revêtement d'une plaque d'acier allié galvanisé par immersion à chaud au moyen d'une composition de revêtement cationique sans plomb obtenue par électrodéposition et contenant un pigment anti-rouille qui forme un film très résistant à la corrosion, ainsi qu'un article obtenu selon ce procédé.

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