A surface treating solution for surface treatment of...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/34 (2006.01) B05D 3/10 (2006.01) C23C 22/44 (2006.01) C23C 22/56 (2006.01) C23C 22/57 (2006.01)

Patent

CA 2477855

A composition for surface treatment of aluminium, aluminum alloy, magnesium or magnesium alloy and the treating solutions being diluted to the desired concentration are defined. A said composition of this invention containing (1) compound A containing at least one metal element selected from the group consisting of Hf(IV), Ti(IV) and Zr(IV), (2) fluorine containing compound of sufficient amount to make fluorine existed in the composition at least by 5 times of molarity to the total molarity of metal contained in above mentioned compound A, (3) at least one metal ion B selected from the group of alkaline earth metals, (4) at least one metal ion C selected from the group consisting of Al, Zn, Mg, Mn and Cu, and (5) nitric ion and the mol concentration of compound A is 0.1-50 mmol/L as metal element of Hf(IV), Ti(IV) and Zr(IV). The metal treated with the treating method applying the present invention solution has excellent resistance to various corrosive environments.

La présente invention a trait à un procédé de traitement de surface qui consiste en la mise en contact de l'aluminium, d'un alliage d'aluminium ou d'un alliage de magnésium avec un liquide de traitement comprenant (1) un composé (A) comportant au moins un atome métallique de Hf (IV), Ti (IV) et Zr (IV), (2) un composé fluoré en une quantité suffisante pour que la concentration molaire du fluor dans le liquide de traitement soit au moins cinq fois celle du total de métal contenu dans le composé A, (3) au moins un ion métallique (B) choisi dans le groupe de métaux alcalino-terreux, (4) au moins un ion métallique (C) choisi dans le groupe constitué de Al, Zn, Mg, Mn et Cu, et (5) un ion de nitrate, dans lequel le composé (A) est présent en une concentration molaire comprise entre 0,1 et 50 mmol/L par rapport audit au moins un atome métallique de Hf (IV), Ti (IV) et Zr (IV). Le procédé permet la formation d'un revêtement de traitement de surface présentant une excellente résistance à la corrosion à l'état brut ou peint, sans la production de déchets tels que des boues et sans l'utilisation d'un constituant nuisible.

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