Corrosion resistant coatings for aluminum and aluminum alloys

Details Corrosion resistant coatings for aluminum and aluminum alloys Corrosion resistant coatings for aluminum and aluminum alloys

C - Chemistry, Metallurgy

23

C

C23C 22/34 (2006.01)

Patent

CA 2425661

This invention is for the protection and surface treatment of aluminum, aluminum alloys and coated aluminum substrates against corrosion. The aluminum substrates are treated with an acidic aqueous solution containing small but effective amounts of at least one trivalent chromium salt such as a trivalent chromium sulfate, at least one alkali metal hexafluorazirconate such as potassium hexafluorozirconate in combination with small but effective amounts of at least one water soluble or dispersible thickening agent such as a cellulose compound and at least one water soluble surfactant. The corrosion resistant alumimum substrates of this invention have improved adhesion for overlaying coatings e.g. paints and a lower electrical resistance contact.

Cette invention concerne la protection et le traitement de surface anti-corrosion de l'aluminium, d'alliages d'aluminium et de substrats recouverts d'aluminium. On traite les substrats en aluminium avec une solution aqueuse acide renfermant en doses faibles, mais efficaces, au moins un sel de chrome trivalent tel qu'un sulfate de chrome trivalent, au moins un hexafluorozirconate de métal alcalin tel qu'un hexafluorozirconate de potassium combiné à des doses faibles. mais efficaces, d'au moins un agent épaississant hydrosoluble ou dispersible tel qu'un composé cellulosique et d'au moins un tensioactif hydrosoluble. Les substrats en aluminium traités anti-corrosion selon l'invention présentent un meilleur pouvoir d'adhérence pour des revêtements tels que des peintures et un moindre résistance de contact électrique.

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