- 专利标题: Perforative corrosion resistant galvanized steel sheet
- 专利标题(中): 耐腐蚀镀锌钢板
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申请号: US09611723申请日: 2000-07-06
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公开(公告)号: US06322906B1公开(公告)日: 2001-11-27
- 发明人: Hisatada Nakakoji , Kyoko Hamahara , Kazuo Mochizuki , Kazumi Yamashita
- 申请人: Hisatada Nakakoji , Kyoko Hamahara , Kazuo Mochizuki , Kazumi Yamashita
- 优先权: JP11-194645 19990708
- 主分类号: B32B1500
- IPC分类号: B32B1500
摘要:
A galvanized steel sheet includes a galvanized coating layer having a coating weight of from about 20 to about 60 g/m2 formed on at least one surface of the steel sheet, and a zinc phosphate coating layer having a coating weight of from about 0.5 to about 3.0 g/m2 formed on the galvanized coating layer. The zinc phosphate coating layer contains from about 0.5 to about 10.0 percent by weight of magnesium, from about 0.1 to about 2.0 percent by weight of nickel, and from about 0.5 to about 8.0 percent by weight of manganese. However, the manganese content and the nickel content satisfy the following relationship: [Ni]×7.6−10.9≦[Mn]≦[Ni]×11.4 wherein [Mn] represents the manganese content, in percent by weight, and [Ni] represents the nickel content, in percent by weight. This steel sheet exhibits superior perforative corrosion resistance. The steel sheet also exhibits superior press workability by further controlling the magnesium, nickel, and manganese contents.
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