Method of chemical treatment and chemically treated member

Details Method of chemical treatment and chemically treated member Method of chemical treatment and chemically treated member

C - Chemistry, Metallurgy

23

C

C23C 22/34 (2006.01)

Patent

CA 2606171

A chemical treatment method in which an object to be treated is treated with a chemical treating agent to form a chemical conversion coating, wherein the object to be treated comprises at least one aluminum-plated steel sheet and at least one member selected from the group consisting of cold-rolled steel sheets, zinc-plated steel sheets, and aluminum sheets and the chemical treating agent is one which comprises zirconium, fluorine, and an aminated silane coupling agent and in which the zirconium content is 100-700 ppm in terms of metal amount and the fluorine/zirconium ratio is 3.5-7.0 by mole. According to the method, a sufficient coating amount can be ensured on the surface of a zinc deposit, cold-rolled steel sheet, zinc-plated steel sheet, aluminum-plated steel sheet, or the like and a chemical conversion coating having sufficient base-hiding properties and sufficient adhesion can be formed.

Procédé de traitement chimique dans lequel un objet à traiter est traité avec un agent de traitement chimique pour former une couche de conversion chimique, l'objet à traiter comprenant au moins une tôle d'acier plaquée d'aluminium et au moins un élément sélectionné dans le groupe constitué de tôles d'acier laminées à froid, de tôles d'acier plaquées de zinc et de tôles d'aluminium et l'agent de traitement chimique étant un agent qui comprend du zirconium, du fluor et un agent de couplage de type silane aminé et la teneur en zirconium étant de 100-700 ppm en termes de quantité de métal et le rapport fluor/zirconium étant de 3,5-7,0 en mole. Selon le procédé, on peut garantir une quantité de revêtement suffisante sur la surface d'un dépôt de zinc, d'une tôle d'acier laminée à froid, d'une tôle d'acier plaquée de zinc, d'une tôle d'acier plaquée d'aluminium ou similaire et on peut former une couche de conversion chimique ayant des propriétés masquant la base suffisantes et une adhérence suffisante.

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