Composition and process for treating metal

Details Composition and process for treating metal Composition and process for treating metal

C - Chemistry, Metallurgy

09

D

C09D 5/08 (2006.01) C23C 22/34 (2006.01)

Patent

CA 2172632

Heating an aqueous mixture of a fluoroacid such as H2TiF6 and an oxide, hydroxide, and/or carbonate such as silica produces a clear mixture with long term stability against settling of any solid phase, even when the oxide, hydroxide, or carbonate phase before heating was a dispersed solid with sufficiently large particles to scatter light and make the mixture before heating cloudy. The clear mixture produced by heating can either be mixed with water soluble and/or water dispersible polymers, for example with dispersed polymers of the diglycidyl ether of bisphenol-A or an acrylic acid polymer, or with soluble hexavalent and/or trivalent chromium, to produce a composition that improves the corrosion resistance of metals treated with the composition, especially after subsequent painting.

Lorsqu'on chauffe un mélange aqueux constitué par un fluoroacide tel que H¿2?TiF¿6? et un oxyde, un hydroxyde et/ou un carbonate tel que de la silice, on obtient un mélange transparent présentant une certaine stabilité longue durée contre tout dépôt de phase solide, même lorsque la phase oxyde, hydroxyde ou carbonate, avant qu'elle soit chauffée, forme un solide dispersé comportant des particules suffisamment grosses pour diffuser la lumière et rendre le mélange trouble. On peut mélanger ledit mélange transparent produit par chauffage avec des polymères solubles et/ou dispersibles dans l'eau avec, par exemple, des polymères dispersés de diglycidyléther de bisphénol-A ou un polymère d'acide acrylique, ou avec du chrome hexavalent ou trivalent, de manière à produire une composition augmentant la résistance à la corrosion de métaux traités avec cette dernière, particulièrement après une mise en peinture ultérieure.

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