Universal aqueous coating compositions for pretreating metal...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/36 (2006.01)

Patent

CA 2486757

A universal aqueous composition and a process for using such a composition for pretreating metal substrates is provided. The aqueous composition includes a hydroxy functional cyclic compound, such as a tannin, in an amount of at least about 500 ppm, phosphate ions, an oxidizer-accelerator, and at least one Group IVB metal compound capable of converting to a metal oxide upon application to the metal substrate, such as a fluorozirconate or fluorotitanate. The composition may further contain fluoride ions and/or iron. The composition is particularly useful for corrosion resistance with a variety of metals such as iron, steel, zinc-coated surfaces, aluminum, and alloys thereof. A disaccharide may further be provided to prolong the useful life of the composition, particularly when used in spray applications.

La présente a trait à une composition aqueuse universelle et un procédé d'utilisation d'une telle composition pour le pré-traitement de substrats métalliques. La composition aqueuse comprend un composé hydroxylé fonctionnel cyclique, tel qu'un acide digallique, en une quantité d'au moins environ 500 ppm, des ions de phosphate, un accélérateur oxydant, et au moins un composé de métal du groupe IVB capable d'être transformé en un oxyde métallique lors de son application au substrat métallique, tel qu'un fluorozirconate ou fluorotitanate. La composition peut comprendre en outre des ions de fluorure et/ou du fer. La composition est particulièrement utile pour la résistance à la corrosion avec une variété de métaux tels que le fer, l'acier, des surfaces revêtues de zinc. l'aluminium, et leurs alliages. On peut également prévoir un disaccharide permettant de prolonger la durée de vie utile de la composition, notamment lorsqu'elle est utilisée dans des applications de projection.

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