Composition and process for treating the surface of...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/36 (2006.01) C23C 22/82 (2006.01)

Patent

CA 2186025

An aqueous liquid composition that has a pH from 1 to 4.0 and comprises from 1 to 80 pbw (parts by weight) of phosphate ions, from 1 to 15 pbw stoichiometric equivalent as zirconium atoms from soluble zirconium compounds, from 3 to 100 pbw stoichiometric equivalent as fluorine atoms of soluble fluorides, and from 1 to 100 pbw of oxidant rapidly produces a very corrosion-resistant and highly paint-adherent coating on the surface of aluminiferous metals when contacted with them at 30 °C to 50 °C for 2 to 30 seconds, followed by a water rinse and drying by heating.

Une composition aqueuse liquide possédant un pH de 1 à 4 et comprenant de 1 à 80 parties en poids d'ions phosphate, de 1 à 15 parties en poids d'équivalent stoechiométrique sous forme d'atomes de zirconium provenant de composés solubles de zirconium, de 3 à 100 parties en poids d'équivalent stoechiométrique sous forme d'atomes de fluor de fluorures solubles, et de 1 à 100 parties en poids d'oxydant permet d'obtenir rapidement un revêtement extrêmement résistant à la corrosion et adhérent à la peinture sur la surface de métaux alumineux, lors de sa mise en contact avec lesdits métaux à une température comprise entre 30 ~C et 50 ~C pendant 2 à 30 secondes, suivie d'un rinçage à l'eau et d'un séchage par réchauffement.

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