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AssigneeNippon Steel Corporation
InventorsKazuhiko Honda, Kazumi Nishimura, Yasuhide Morimoto, Satoru Tanaka, Yoshihiro Suemune, Jun Maki, Hidetoshi Shindo, Masaaki Sugiyama, Hiroyasu Furukawa, Masao Kurosaki, Hiromasa Nomura, Hiroshi Kanai, Kohei Ueda
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A coated steel material excellent in corrosion resistance and a method of producing the same, wherein a coated steel material has on the surface of the steel sheet a Zn-alloy coating layer containing 1-10 wt % of Mg, 2-19 wt % of Al and 0.01-2 wt % of Si, where Mg and Al satisfy Mg (%)+Al (%)≦20%, the balance being 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. The coated Zn-alloy coated steel sheet may have provided on the coating layer, as an intermediate layer, a chromate film layer, and, as an upper layer, an organic coating layer. The Zn-alloy coating layer 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. The coated steel material may be painted.
A Zn coated steel material excellent in corrosion resistance characterized in having, on a surface of a steel material, a Zn-alloy coating layer containing 2-19 wt % of Al, 1-10 wt % of Mg, 0.01-2 wt % of Si and the balance of Zn and unavoidable impurities.
In a method of producing a Zn-alloy coated steel material having, on a surface of a steel material, a Zn-alloy coating containing 3-10 wt % of Mg, 4-19 wt % of Al, 0.01-2 wt % 6 of Si and the balance of Zn and unavoidable impurities, the method of producing the Zn-alloy coated steel material excellent in corrosion resistance comprising:
Dependencies are inferred from the claim text.