Post-treatment for anodized aluminum

Details Post-treatment for anodized aluminum Post-treatment for anodized aluminum

C - Chemistry, Metallurgy

25

D

C25D 11/24 (2006.01) C23C 22/34 (2006.01)

Patent

CA 2466045

Composition for post-treating anodized aluminum and aluminum alloys and the process for using said composition to improve the corrosionresistance, abrasion, and adhesion bonding properties of the anodized aluminum and its alloys. The composition comprises an acidic aqueous solution having a pH ranging from about 2.5 to 4.5 containing effective amounts of trivalent chromium salts, alkali metal hexafluorozirconates, an alkali metal fluoro- compound e.g. fluoroborates and/or fluorosilicates, and effective amounts of water soluble thickeners and surfactants.

L'invention concerne une composition de post-traitement d'aluminium anodisé et d'alliages d'aluminium, et un procédé d'utilisation de ladite composition afin d'améliorer les propriétés de résistance à la corrosion, à l'abrasion et les propriétés d'adhérence de l'aluminium anodisé et de ses alliages. Ladite composition comprend une solution aqueuse acide présentant une plage de pH comprise entre environ 2,5 et 4,5; qui contient des quantités efficaces de sels de chrome trivalent, des hexafluorozirconates de métal alcalin, un composé fluoré de métal alcalin, par exemple des fluorocarbonates et/ou des fluorosilicates, et des quantités efficaces d'épaississants et de tensio-actifs solubles dans l'eau.

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