公开(公告)号：EP1199376B1

公开(公告)日：2007-05-09

申请号：EP99961441.5

申请日：1999-12-27

申请人： NIPPON STEEL CORPORATION

发明人： HONDA, Kazuhiko ,  NISHIMURA, Kazumi, Nippon Steel Corporation ,  MORIMOTO, Yasuhide, Nippon Steel Corporation ,  TANAKA, Satoru ,  SUEMUNE, Yoshihiro ,  MAKI, Jun, Nippon Steel Corporation Yawata Works ,  SHINDO, Hidetoshi, Nippon Steel Corporation ,  SUGIYAMA, Masaaki, Nippon Steel Corporation ,  FURUKAWA, Hiroyasu ,  KUROSAKI, Masao, Nippon Steel Corporation ,  NOMURA, Hiromasa, Nippon Steel Corporation ,  KANAI, Hiroshi, Nippon Steel Corporation ,  UEDA, Kohei, Nippon Steel Corporation

IPC分类号： C23C2/06 ,  C23C22/17

CPC分类号： C23C2/02 ,  B05D7/51 ,  C23C2/06 ,  C23C28/00 ,  C23C28/021 ,  C23C28/023 ,  C23C2222/20 ,  Y10S428/926 ,  Y10T428/12569 ,  Y10T428/12799 ,  Y10T428/12937 ,  Y10T428/12944 ,  Y10T428/263 ,  Y10T428/264 ,  Y10T428/273

摘要： A plated steel product having excellent resistance to corrosion, characterized in that it comprises, on a steel product, a Zn alloy plating layer having the composition that Mg: 1 to 10 wt. %, Al: 2 to 19 wt. %, Si: 0.01 to 2 wt. %, balance: Zn and inevitable impurities, with the proviso that the amounts of Mg and Al satisfy the relationship: Mg (%) + Al (%) ≤ 20 %, and having a plating layer structure of, for example, an intermetallic compound containing Mg; and a method for producing the plated steel product. Preferably, the plated product further comprises a Ni plating layer as a ground coat. Also provided is a precoated steel sheet having excellent resistance to corrosion, characterized in that it comprises, on the above plating layer, a chromate coating layer as an intermediate layer, and an organic coating layer as a top coat layer in a thickness of 1 to 100 νm, or it comprises, on the plating layer, a chromate coating layer in a thickness corresponding to 10 to 300 mg in terms of metallic chromium/m2, as a top coat layer. The above Zn alloy plating layer can further comprise one or more of 0.01 to 1 wt. % of In, 0.01 to 1 wt. % of Bi, and 1 to 10 wt. % of Sn.

公开(公告)号：EP1199376A1

公开(公告)日：2002-04-24

申请号：EP99961441.5

申请日：1999-12-27

申请人： Nippon Steel Corporation

发明人： HONDA, Kazuhiko ,  NISHIMURA, Kazumi, Nippon Steel Corporation ,  MORIMOTO, Yasuhide, Nippon Steel Corporation ,  TANAKA, Satoru ,  SUEMUNE, Yoshihiro ,  MAKI, Jun, Nippon Steel Corporation Yawata Works ,  SHINDO, Hidetoshi, Nippon Steel Corporation ,  SUGIYAMA, Masaaki, Nippon Steel Corporation ,  FURUKAWA, Hiroyasu ,  KUROSAKI, Masao, Nippon Steel Corporation ,  NOMURA, Hiromasa, Nippon Steel Corporation ,  KANAI, Hiroshi, Nippon Steel Corporation ,  UEDA, Kohei, Nippon Steel Corporation

IPC分类号： C23C2/06 ,  C23C22/17

CPC分类号： C23C2/02 ,  B05D7/51 ,  C23C2/06 ,  C23C28/00 ,  C23C28/021 ,  C23C28/023 ,  C23C2222/20 ,  Y10S428/926 ,  Y10T428/12569 ,  Y10T428/12799 ,  Y10T428/12937 ,  Y10T428/12944 ,  Y10T428/263 ,  Y10T428/264 ,  Y10T428/273

摘要： Provided are a Zn coated steel material, a Zn coated steel sheet and a painted steel sheet excellent in corrosion resistance, and a method of producing the same. Specifically, there is provided coated steel material excellent in corrosion resistance and a method of producing the same, which coated steel material is characterized in that it has, on the surface of 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 composed of 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. Also provided are a coated Zn coated steel sheet provided on the coating layer with, as an intermediate layer, a chromate film layer, and further with, as an upper layer, an organic coating layer, and a Zn coated steel sheet excellent in corrosion resistance provided on the coating layer with, as an upper layer, a chromate film, formed by coating with a resin chromate bath and drying, at 10 - 300 mg/m 2 as metallic chromium.
The Zn-alloy coating layer according to the present invention 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.
Further provided is a painted steel sheet having on the Zn-alloy coating layer a base metal treatment film layer containing 100 parts by weight of resin as solid content and 0.2 - 50 parts by weight of tannin or tannic acid and on the base metal treatment film layer, as an upper layer, an organic coating layer. Preferably the Zn-alloy coating layer further contains 0.01 - 2 wt% of Si, the base metal treatment film layer further contains 10 - 500 parts by weight of fine-grain silica as solid content, the organic coating layer is composed of an undercoating containing an anti-rust pigment and a colored overcoating, and a Ni coating layer is present under the zn-alloy coating layer. Further provided is a painted steel sheet having a base metal treatment film layer containing 100 parts by weight of resin as solid content and 0.1 - 3,000 parts by weight of a silane coupling agent and on the base metal treatment film layer, as an upper layer, an organic coating layer. The Zn-alloy coating layer can contain 0.01 - 2 wt% of Si and the base metal treatment film layer can further contain, as solid content, one or both of 1 - 200 parts by weight of fine-grain silica and 0.1 - 1,000 parts by weight of an etching fluoride.
Moreover, a structure is present wherein intermetallic compound phase of 1 µm or greater major diameter is dispersed in the Zn-alloy coating layer at a content of 0.1 - 50 vol%.