Process for coating metal surfaces

B - Operations – Transporting – 05 – D

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B05D 3/10 (2006.01) B05D 7/14 (2006.01) C09D 5/08 (2006.01)

Patent

CA 2175694

A process for coating metal surfaces in which an uncured resin coating is formed on the surface of a metal by contracting the metal surface with an autodepositing coating composition that contains acid, oxidizing agent, and water-dispersible or water-soluble organic film- forming resin, and the uncured coating is thereafter dried, produces a strongly adherent, highly corrosion-resistant autodeposited coating when the uncured coating is brought, prior to its drying, into contact with an aqueous solution that has a pH adjusted to 7 to 11 and that contains at least one selection from the following inorganic acids and salts thereof: molybdic acid, tungstic acid, polyphosphoric acid, and polysilicic acid.

Procédé de revêtement de surfaces métalliques consistant à former sur la surface d'un métal un revêtement de résine non durcie. Pour ce faire on met en contact la surface métallique avec une composition de revêtement qui se dépose automatiquement et qui contient de l'acide, un agent oxydant et une résine organique filmogène se dispersant ou se disolvant dans l'eau, puis on sèche le revêtement non durci. On obtient un revêtement qui s'est déposé tout seul, adhère très fortement et résiste extrêmement bien à la corrosion lorsque, avant le séchage, on met en contact le revêtement non durci avec une solution aqueuse dont le pH est réglé entre 7 et 11 et qui contient au moins un constituant sélectionné parmi les acides inorganiques, et leurs sels, suivants: acide molybdique, acide tungstique, acide polyphosphorique et acide polysilicique.

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