Composition and processes of a dry-in-place trivalent...

Details Composition and processes of a dry-in-place trivalent... Composition and processes of a dry-in-place trivalent...

C - Chemistry, Metallurgy

23

C

C23C 22/34 (2006.01) B05D 5/00 (2006.01) C23C 22/83 (2006.01) C25D 11/24 (2006.01)

Patent

CA 2642365

Corrosion resistant coatings are formed on aluminum by contacting with aqueous solutions containing trivalent chromium ions and fluorometallate ions, the solutions being substantially free of hexavalent chromium. Trivalent chromium films formed on the aluminum surface when tested in 5% NaCl salt spray chamber showed corrosion resistance in excess of 168 hours. Trivalent chromium coated aluminum also serves as an effective base for paint primers.

La présente invention concerne des revêtements résistants à la corrosion qui sont formés sur de l'aluminium par contact avec des solutions aqueuses contenant des ions chrome trivalents et des ions fluorométallate, les solutions étant substantiellement exemptes de chrome hexavalent. Des films de chrome trivalent formés sur la surface en aluminium une fois testés dans une chambre de pulvérisation de sel de NaCl à 5 % ont présenté une résistance à la corrosion de plus de 168 heures. L'aluminium enduit de chrome trivalent sert également de base effective pour des amorces de peinture.

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