C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/53 (2006.01) B05D 7/14 (2006.01) C09D 5/08 (2006.01) C23C 22/08 (2006.01) C23C 22/56 (2006.01) C23C 22/78 (2006.01) C23C 22/83 (2006.01)
Patent
CA 2542090
The invention relates to an essentially chromium-free method for passivating metallic surfaces consisting of Zn, Zn alloys, Al or Al alloys, by treating the surface with an acid, aqueous preparation containing at least one essentially non-crosslinked, water-soluble polymer or copolymer comprising at least 50 wt. % of (meth)acrylic acid units, and further treatment of the surface by means of at least one water-soluble crosslinking agent comprising at least two crosslinking groups selected from the azirane, oxirane or thiirane groups. The invention also relates to passivation layers that can be obtained by means of the cited method, and to a preparation suitable for said method.
L'invention concerne un procédé essentiellement exempt de chrome destiné à la passivation de surfaces métalliques en Zn, alliages de Zn, Al ou alliages d'Al, par traitement de la surface au moyen d'une préparation acide aqueuse contenant au moins un polymère ou copolymère soluble dans l'eau, essentiellement non-réticulé, comportant au moins 50 % en poids d'unités d'acide (méth)acrylique, ainsi que de l'eau ou un mélange de solvants aqueux comportant au moins 50 % en poids d'eau, et traitement supplémentaire de la surface au moyen d'au moins un agent réticulant soluble dans l'eau comportant au moins 2 groupes réticulants choisis parmi des groupes azirane, oxirane ou thiirane. L'invention concerne également des couches de passivation pouvant être obtenues au moyen du procédé selon l'invention et une préparation adaptée au procédé selon l'invention.
Dietsche Frank
Gothlich Alexander
Klippel Frank
Kluglein Matthias
Basf Aktiengesellschaft
Robic
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