Surface-treated steel sheet and manufacturing method thereof

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 22/73 (2006.01) C23C 22/08 (2006.01) C23C 22/10 (2006.01)

Patent

CA 2329029

The present invention has an object to provide a surface-treated steel sheet which has highly balanced corrosion resistance and formability, and satisfies fundamental properties required mainly for steel sheets for automobile body, and a manufacturing method thereof. The surface-treated steel sheet of the invention is excellent in corrosion resistance and formability, comprising an amorphous inorganic film containing at least 5% magnesium and having a weight within a range of from 0.1 to 2.0 g/m2, formed on the surface of a zinc or zinc alloy plated steel sheet wherein the inorganic film is soluble in an acidic solution and hardly soluble in a neutral or alkaline solution, and a manufacturing method thereof is provided. A zinc phosphate film may be provided between the galvanized steel sheet and the amorphous inorganic film. The inorganic film should preferably comprise one or more selected from the group consisting of phosphoric acid, phosphates, biphosphates, various condensed phosphoric acids, various condensed phosphates, organic phosphoric acid, and organic phosphates.

L'invention a pour but de fournir une feuille d'acier traité en surface qui manifeste un très bon équilibre entre la résistance à la corrosion et l'aptitude au formage et qui possède les propriétés fondamentales que l'on demande aux feuilles d'acier utilisées dans des carrosseries automobiles, ainsi que des procédés de fabrication correspondants. L'invention concerne une feuille d'acier traité en surface, excellent en matière de résistance à la corrosion et d'aptitude au formage, qui comprend un film inorganique amorphe ayant une teneur en magnésium d'au moins 5 % et possédant un poids compris entre 0,1 et 2,0 g/m<2>, formé à la surface d'une feuille d'acier plaquée avec du zinc ou avec un alliage de zinc. Le film inorganique est soluble dans une solution acide et ne se dissout pratiquement pas dans des solutions neutres ou alcalines. L'invention concerne aussi un procédé de fabrication correspondant. On peut insérer entre la feuille d'acier galvanisé et le film inorganique amorphe un film de phosphate de zinc. Le film inorganique doit comprendre de préférence un ou plusieurs composants sélectionnés dans le groupe qui comprend l'acide phosphorique, des phosphates, des biphosphates, divers acides phosphoriques condensés, divers biphosphates condensés et des phosphates organiques.

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