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US 5,849,423 AGranted
Zinciferous plated steel sheet and method for manufacturing same
AssigneeNKK Corporation
InventorsTakayuki Urakawa, Toru Imokawa, Michitaka Sakurai, Jun-ichi Inagaki, Masaaki Yamashita, Shuji Nomura
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Abstract
A method for manufacturing a zinciferous plated steel sheet, comprises: forming a zinciferous plating layer on a steel sheet; and forming an Fe--Ni--O film on the zinciferous plating layer. The Fe--Ni--O film is formed by carrying out electrolysis with the steel sheet as a cathode in an aqueous solution, dipping the steel sheet in an aqueous solution, or spraying a mist on a surface of the zinciferous plating layer.
Claims52
A zinciferous plated steel sheet comprising:
- a steel sheet;
- a zinciferous plating layer which is formed on the steel sheet;
- and
- an Fe--Ni--O film which is formed on the zinciferous plating layer;
- said Fe--Ni--O film having an island form or a mosaic form;
- said Fe--Ni--O film having a coating weight of 10 to 1500 mg/m.sup.2 in terms of the total weight of metallic elements in the Fe--Ni--O film;
- and
- said Fe--Ni--O film having a coverage of surface coating of 30 to 90%.
5 more elements
A zinciferous plated steel sheet comprising:
- a steel sheet;
- a zinciferous plating layer which is formed on the steel sheet;
- and
- an Fe--Ni--O film which is formed on the zinciferous plating layer;
- said zinciferous plating layer being an alloyed zinc dip-plating layer;
- said alloyed zinc dip-plating layer comprising 6 to 11 wt. % Fe and the balance being Zn and inevitable impurities;
- said alloyed zinc dip-plating layer having a surface layer, the surface layer consisting essentially of .zeta. phase;
- and
- said alloyed zinc dip-plating layer having a coating weight of 20 to 100 g/m.sup.2.
6 more elements
A zinciferous plated steel sheet comprising:
- a steel sheet;
- a zinciferous plating layer which is formed on the steel sheet;
- an Fe--Ni--O film which is formed on the zinciferous plating layer;
- said zinciferous plating layer being an alloyed zinc dip-plating layer;
- said alloyed zinc dip-plating layer comprising 9 to 14 wt. % Fe and the balance being Zn and inevitable impurities;
- said alloyed zinc dip-plating layer having a surface layer, the surface layer consisting essentially of .zeta.1 phase;
- and
- said alloyed zinc dip-plating layer having a coating weight of 20 to 100 g/m.sup.2.
5 more elements
Dependencies are inferred from the claim text.