Chromium-free, thermally curable corrosion protection...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 22/34 (2006.01) C09D 5/08 (2006.01) C23C 22/36 (2006.01) C23C 22/40 (2006.01) C23C 22/44 (2006.01)

Patent

CA 2661432

Chromium-free, curable corrosion protection composition for primary coating of metallic substrates, which has a pH in the range from 1 to 3 and contains water and a) fluorocomplex ions of titanium and/or zirconium, b), at least one corrosion protection pigment, c) at least one organic polymer which is soluble or dispersible in water in the specified pH range and on its own in aqueous solution at a concentration of 50% by weight has a pH in the range from 1 to 3, process for treating metal strip with this composition and treated metal strip which can be obtained in this way. The organic polymer c) is preferably selected so that it contains at least one monomer selected from among acrylic acid, methacrylic acid, acrylic esters and methacrylic esters as free-radically polymerizable, ethylenically unsaturated monomers and has at least one type of functional groups selected from among epoxy, silane, hydroxy, carboxyl, phosphoric acid and phosphoric ester groups.

L'invention concerne un agent anti-corrosion durcissable et exempt de chrome destiné au premier revêtement de supports métalliques, qui présente un pH dont la valeur est comprise entre 1 et 3, contient de l'eau et a) des ions fluorocomplexés de titane et/ou de zirconium, b) au moins un pigment anti-corrosion, c) au moins un polymère organique soluble dans l'eau ou dispersible dans l'eau dans ladite plage de pH et qui présente en solution aqueuse à une concentration de 50 % en poids un pH dont la valeur est intrinsèquement comprise entre 1 et 3. L'invention concerne également un procédé de traitement d'un feuillard métallique avec cet agent et le feuillard métallique traité ainsi obtenu. De préférence, le polymère organique c) sélectionné contient comme monomères éthyléniquement insaturés et polymérisables par radicaux au moins un monomère sélectionné parmi l'acide acrylique, l'acide méthacrylique, les esters d'acide acrylique et les esters d'acide méthacrylique, et il présente au moins un type de groupes fonctionnels sélectionnés parmi les groupes époxy, silane, hydroxyle, carboxyle, acide phosphorique et esters d'acide phosphorique.

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