Chromium-free anticorrosive and anticorrosive method

Details Chromium-free anticorrosive and anticorrosive method Chromium-free anticorrosive and anticorrosive method

C - Chemistry, Metallurgy

09

D

C09D 5/08 (2006.01) C23C 22/34 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2374539

The invention relates to a chromium-free aqueous anticorrosive which is suitable for producing thin organic layers on surfaces of steel, metallized (e.g. galvanized or alloy-galvanized) steel and aluminum. The inventive anticorrosive contains as the essential components a) 0.5 to 100 g/l hexafluorine anions of titanium (IV), silicon (IV) and/or zirconium (IV); b) 20 to 100 g/l phosphoric acid; c) 0 to 100 g/l of one or more compounds of cobalt, nickel, vanadium, iron, manganese, molybdenum or tungsten; d) 0.5 to 30 wt.- %. of at least one water-soluble or water-dispersible film-forming organic polymer or copolymer; e) 0.1 to 10 wt.- % of an organosphonic acid; f) optionally further auxiliaries and additives. The inventive compositions are especially useful for the anticorrosive treatment of metal strips. They are preferably applied in such a manner that a dry layer is produced on the surface in a mass surface density of 0.1 to 5 g/m2.

Cette invention concerne agent anticorrosif aqueux dépourvu de chrome, convenant à la réalisation de fines couches organiques sur des surfaces en acier, en acier recouvert de métal (par exemple de zinc ou d'un alliage au zinc) et en aluminium. Cet agent anticorrosif comprend principalement les éléments suivants: a) 0,5 à 100 g/l d'anions hexafluoro du titane (IV), silicium (IV) et/ou zircon (IV); b) 20 à 100 g/l d'acide phosphorique; c) 0 à 100 g/l d'un ou plusieurs composés du cobalt, nickel, vanadium, fer, manganèse, molybdène ou tungstène; d) 0,5 à 30 % en poids d'au moins un polymère ou copolymère organique filmogène soluble ou dispersable dans l'eau; e) 0,1 à 10 % en poids d'un acide organophosphonique; f) éventuellement un ou plusieurs auxiliaires ou additifs. Les compositions conviennent particulièrement au traitement anticorrosif de bandes de métal et sont de préférence appliquées de manière à former sur la surface une couche sèche de masse surfacique comprise entre 0,1 et 5 g/m?2¿.

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