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Dual layer-coated electro-galvanized steel sheet for coating with excellent bare corrosion resistance, corrosion resistance after coating and formability
Dual layer-coated electro-galvanized steel sheet for coating with excellent bare corrosion resistance, corrosion resistance after coating and formability
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机译:用于涂层的双层镀锌钢板,具有出色的裸露耐腐蚀性,涂层后的耐腐蚀性和可成型性
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摘要
An electro-galvanized steel sheet for coating excellent in bare corrosion resistance, corrosion resistance after coating and formability, which comprises: a steel sheet; a first electro-galvanized layer, as a lower layer, in an amount of from 5 to 120 g/m.sup.2 per side, formed on at least one surface of said steel sheet, said first electro- galvanized layer comprising either an electro-galvanized layer consisting essentially of zinc or a compound electro-galvanized layer consisting essentially of zinc, cobalt and at least one of chromium, indium and zirconium; and a second electro-galvanized layer, as an upper layer, in an amount of from 0.2 to 10 g/m.sup.2 per side, formed on said first electro-galvanized layer, said second electro-galvanized layer consisting essentially of an alloy layer of zinc and from 1 to 60 wt. % iron. Said electro-galvanized steel sheet for coating is adapted to serve particularly for external, underside and closed structures of an automobile.
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机译:1。一种镀锌钢板,其裸露耐蚀性,涂覆后耐蚀性和成形性优异。在所述钢板的至少一个表面上形成的第一电镀锌层作为下层,其每侧的量为5至120g / m 2,所述第一电镀锌层包括以下任一项:基本上由锌组成的电镀锌层或基本上由锌,钴和铬,铟和锆中至少一种组成的化合物电镀锌层;在所述第一电镀锌层上形成的第二电镀锌层作为上层,每侧的量为0.2-10g / m 2,所述第二电镀锌层基本上由铝构成。锌和1至60 wt。 %铁。所述用于涂层的电镀锌钢板特别适合用于汽车的外部,底侧和封闭结构。
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