Treating solution for metal surface treatment and a method...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/34 (2006.01) B05D 3/10 (2006.01) C23C 22/50 (2006.01) C23C 22/53 (2006.01)

Patent

CA 2450644

A surface treatment method for a metal material comprising iron and/or zinc, which comprises contacting the metal material with a treating solution for surface treatment comprising (A) a compound containing at least one metal element selected from Ti, Zr, Hf and Si and (B) a fluorine-containing compound as a supply source of HF, wherein the ratio (K = A/B) of the total mole weight A of the metals, namely Ti, Zr, Hf and Si, in the compounds of the component (A) to the mole weight B of the fluorine-containing compound (B) in terms of the HF obtained by converting all the fluorine atoms in the fluorine- containing compound is in the range of 0.06 <= K <= 0.18, and the total molar concentration of the metals, namely Ti, Zr, Hf and Si, in the compounds of component (A) is in the range of 0.05 to 100 mmol/L. The treating solution for surface treatment optionally further comprises at least one element selected from among Ag, Al, Cu, Fe, Mn, Mg, Ni, Co and Zn. The surface treatment method uses a treating bath free of a component harmful to the environment and also can be employed for depositing a surface treatment film excellent in corrosion resistance after application, on the surface of a metal material containing at least one of iron and zinc.

L'invention concerne un procédé de traitement de surface pour un matériau métallique comportant du fer et/ou du zinc qui comprend la mise en contact du matériau métallique avec une solution traitante pour un traitement de surface contenant (A) un élément contenant au moins un élément métallique sélectionné à partir de Ti, Zr, Hf et Si et (B), un élément contenant du fluor comme source d'alimentation en Hf. Le taux (K=A/B) du poids moléculaire total A de métaux, à savoir Ti, Zr, Hf, et Si dans les éléments de l'élément (A) au poids moléculaire B de l'élément (B) contenant du fluor en termes de Hf obtenu par conversion de tous les atomes de fluor dans l'élément contenant du fluor se trouve dans la gamme de 0,06<=K<=0,18. La concentration molaire totale des métaux, à savoir Ti, Zr, Hf et si dans les éléments de l'élément (A) se trouve dans la gamme de 0,05 à 100 mol/lL. La solution traitante en vue d'un traitement de surface comprend également éventuellement au moins un élément sélectionné à partir de Ag, Al, Cu, Fe, Mn, Mg, Ni, Co et Zn. Le procédé de traitement de surface utilise un bain de traitement dépourvu de tout élément dommageable à l'environnement et pouvant également servir pour déposer un film de traitement de surface excellent en termes de résistance à la corrosion après application sur la surface d'un matériau métallique contenant au moins un élément fer et zinc.

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