Zn coated steel material.zn coated steel sheet and painted...

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 2/06 (2006.01) C23C 2/02 (2006.01) C23C 22/17 (2006.01) C23C 28/00 (2006.01) B05D 7/00 (2006.01)

Patent

CA 2374757

Provided are a Zn coated steel material, a Zn coated steel sheet and a painted steel sheet excellent in corrosion resistance, and a method of producing the same. Specifically, there is provided coated steel material excellent in corrosion resistance and a method of producing the same, which coated steel material is characterized in that it has, on the surface of steel sheet, a Zn-alloy coating layer containing more than 2 - 10 wt% of Mg, 4 - 19 wt% of Al and 0.01 - 2 wt% of Si, where Mg and Al satisfy Mg(%) + Al(%) <= 20%, the balance being composed of Zn and unavoidable impurities, and has a coating layer structure of a Mg intermetallic compound or the like. As a base metal treatment, it is preferably provided with a Ni coating layer. Also provided are a coated Zn coated steel sheet provided on the coating layer with, as an intermediate layer, a chromate film layer, and further with, as an upper layer, an organic coating layer, and a Zn coated steel sheet excellent in corrosion resistance provided on the coating layer with, as an upper layer, a chromate film, formed by coating with a resin chromate bath and drying, at 10 - 300 mg/m2 as metallic chromium. The Zn-alloy coating layer according to the present invention may further contain one or more of 0.01 - 1 wt% of In, 0.01 - 1 wt% of Bi and 1 - 10 wt% of Sn. Further provided is a painted steel sheet having on the Zn-alloy coating layer a base metal treatment film layer containing 100 parts by weight of resin as solid content and 0.2 - 50 parts by weight of tannin or tannic acid and on the base metal treatment film layer, as an upper layer, an organic coating layer. Preferably the Zn- alloy coating layer further contains 0.01 - 2 wt% of Si, the base metal treatment film layer further contains 10 - 500 parts by weight of fine-grain silica as solid content, the organic coating layer is composed of an undercoating containing an anti-rust pigment and a colored overcoating, -94- and a Ni coating layer is present under the Zn-alloy coating layer. Further provided is a painted steel sheet having a base metal treatment film layer containing 100 parts by weight of resin as solid content and 0.1 - 3,000 parts by weight of a silane coupling agent and on the base metal treatment film layer, as an upper layer, an organic coating layer. The Zn-alloy coating layer can contain 0.01 - 2 wt% of Si and the base metal treatment film layer can further contain, as solid content, one or both of 1 - 200 parts by weight of fine-grain silica and 0.1 - 1,000 parts by weight of an etching fluoride. Moreover, a structure is present wherein intermetallic compound phase of 1 µm or greater major diameter is dispersed in the Zn-alloy coating layer at a content of 0.1 - 50 vol%.

L'invention concerne un produit d'acier plaqué possédant une excellente résistance à la corrosion, caractérisé par le fait qu'il comporte, dans un produit d'acier, une couche de placage en alliage de Zn présentant la composition suivante: de 1 à 10 % en poids Mg, de 2 à 19 % en poids d'Al, de 0,01 à 2 % en poids de Si, le reste étant du zinc et des impuretés inévitables, à condition que les quantités de Mg et d'Al puissent satisfaire la relation suivante: Mg (%) + Al (%) </= 20 %; et une structure de couche de placage constituée, par exemple, d'un composé intermétallique contenant Mg; et un procédé de production du produit d'acier plaqué. De préférence, le produit plaqué comporte en outre une couche de placage à base de Ni comme revêtement primaire. L'invention concerne également une feuille d'acier prérevêtue possédant une excellente résistance à la corrosion, caractérisée par le fait qu'elle comporte, sur ladite couche de placage, une couche de revêtement à base de chromate comme couche intermédiaire, et une couche de revêtement organique comme couche supérieure de revêtement d'une épaisseur de 1 à 100 mu m; ou qu'elle comporte, sur la couche de placage, une couche de revêtement à base de chromate d'une épaisseur correspondant à une quantité de 10 à 300 mg de chrome métallique/m<2> comme couche supérieure de revêtement. La couche de placage en alliage de Zn mentionnée peut comporter en outre un ou plusieurs éléments sélectionnés dans le groupe comprenant: de 0,01 à 1 % en poids d'In, de 0,01 à 1 % en poids de Bi, et de 1 à 10 % en poids de Sn.

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