Composition for surface conditioning and surface...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 22/80 (2006.01) B32B 15/08 (2006.01) C09D 161/06 (2006.01) C09D 201/08 (2006.01)

Patent

CA 2640939

Disclosed is a composition for surface conditioning which enables to form a chemical conversion coating of sufficient amount even when it is applied to a metal material such as a high tension steel sheet which is hardly chemically converted. The composition for surface conditioning can be stored as a dispersion for a long time, in which dispersion a titanium phosphate compound stably exists. In addition, the composition exhibits good stability in a bath. Specifically disclosed is a composition for surface conditioning, which contains a titanium phosphate compound while having a specific pH. By blending an amine compound having a specific structure, an aromatic organic acid, a phenol compound, a phenol resin and the like into the composition for surface conditioning, the composition attains good dispersibility and enables to form a chemical conversion coating of sufficient amount.

La présente invention concerne une composition de conditionnement de surface permettant de former une couche de conversion chimique en quantité suffisante même en cas d'application à un matériau métallique, tel qu'une tôle d'acier à forte résistance à la traction, qui présente une difficulté de conversion chimique. La composition de conditionnement de surface peut être stockée durablement sous forme d'une dispersion dans laquelle un composé de phosphate de titane existe de manière stable. En outre, la composition présente une bonne stabilité dans un bain. Cette invention concerne en particulier une composition de conditionnement de surface contenant un composé de phosphate de titane et possédant un certain pH. Le mélange d'un composé amine à structure particulière, d'un acide organique aromatique, d'un composé phénolé, d'une résine phénolique et similaire dans la composition permet de lui conférer une bonne dispersibilité et de former une couche de conversion chimique en quantité suffisante.

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