Zr-/ti-containing phosphating solution for passivation of...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/36 (2006.01)

Patent

CA 2669042

The invention relates to an aqueous composition and a method for corrosion protective conversion treatment of metal surfaces. The aqueous composition is particularly suitable for the treatment of various metal materials, joined in composite structures, amongst others of steel or galvanised steel or the alloys thereof and any of combination of said materials, the composite structure being at least partly made from aluminium or alloys thereof. According to the invention, the aqueous composition based on a phosphating solution contains in addition to water-soluble compounds of zirconium and titanium an amount of free fluoride in a ratio that permits the phosphatising of the steel and galvanised steel or the alloys thereof and also a low etching rate of the aluminium surface with concomitant passivation of the aluminium surface. The metal materials, components and composite structures subjected to the conversion treatment according to the invention are applicable in automobile chassis production, in ship building, in civil engineering and the production of white goods.

L'invention concerne une composition aqueuse et un procédé de traitement de conversion à effet anticorrosif de surfaces métalliques. Ladite composition aqueuse s'utilise tout particulièrement dans le traitement de différents matériaux métalliques, réunis dans des structures composites, notamment l'acier ou l'acier galvanisé ou galvanisé allié, ainsi que dans celui de toutes les combinaisons comprenant lesdits matériaux. La structure composite comprend au moins en partie de l'aluminium ou ses alliages. La composition aqueuse à base d'une solution de phosphatage contient, outre des composés de zircon et de titane solubles dans l'eau, une quantité selon l'invention de fluorure libre, dans un rapport qui permet le phosphatage de surfaces en acier et de surfaces en acier galvanisé et/ou galvanisé allié et présuppose à la fois de faibles taux d'attaque du substrat en aluminium avec passivation simultanée de la surface en aluminium. Les matériaux, éléments et structures composites métalliques correspondants, qui ont été soumis à un traitement de conversion, selon l'invention, s'utilisent dans la construction automobile, dans la fabrication de carrosseries, dans la construction navale, dans l'industrie du bâtiment, ainsi que dans la fabrication de gros appareils électroménagers.

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