| 摘要 |
PROBLEM TO BE SOLVED: To produce a precoated steel sheet excellent in corrosion-resistance in the part to be machined and applicable as panel materials for house appliances, building materials or the like. SOLUTION: The surface of a steel sheet is constituted, as a lower layer, of a galvanized layer composed of, by weight, 0.05 to 3.0% Mg, 0.1 to 1.0% Al, and the balance Zn with inevitable impurities, or, as a lower layer, of a galvanized layer composed of 0.05 to 3.0% Mg, 0.1 to 1.0% Al, 0.01 to 0.3% Co, and the balance Zn with inevitable impurities, as an intermediate layer, of a chromate coated layer and, as an upper layer, of an organic coating layer of 1 to 100μm thickness, and, if necessary, as the lower layer of the galvanized layer, an Ni plating layer is provided. |
