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Title:
SURFACE TREATED TIN-PLATED STEEL SHEET AND CHEMICAL TREATMENT SOLUTION
Document Type and Number:
WIPO Patent Application WO/2002/038830
Kind Code:
A1
Abstract:
A surface treated tin-plated steel sheet which has (1) an alloy layer formed on the surface of a steel sheet, (2) a tin plating layer being formed on said alloy layer with a remaining exposed portion of the alloy layer having an area of 3.0 % or more of that of said alloy layer and, formed on said tin plating layer and said exposed portion of the alloy layer, (3) a coating film containing P and Si in an amount of 0.5 to 100 mg/m?2¿ and 0.1 to 250 mg/m?2¿, respectively; and a chemical treatment solution for use in preparing the steel sheet which comprises a phosphate ion, a tin ion and a silane coupling agent and has a pH of 1.5 to 5.5. The surface treated tin-plated steel sheet is free from chromium which causes problems from an environmental view point, and also is excellent in adhesion with a paint, corrosion resistance after being coated, rust resistance, and formability.

Inventors:
SHIGEKUNI TOMOFUMI (JP)
NAKAKOJI HISATADA (JP)
MOCHIZUKI KAZUO (JP)
KATO CHIAKI (JP)
Application Number:
PCT/JP2001/009424
Publication Date:
May 16, 2002
Filing Date:
October 26, 2001
Export Citation:
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Assignee:
KAWASAKI STEEL CO (JP)
SHIGEKUNI TOMOFUMI (JP)
NAKAKOJI HISATADA (JP)
MOCHIZUKI KAZUO (JP)
KATO CHIAKI (JP)
International Classes:
C25D5/26; C22C38/00; C22C38/08; C23C2/08; C23C22/07; C23C22/08; C23C28/00; C25D5/50; C25D7/00; C25D5/48; (IPC1-7): C23C28/00
Foreign References:
JPH04346676A1992-12-02
Other References:
See also references of EP 1270764A4
None
Attorney, Agent or Firm:
Ochiai, Kenichiro c/o Tokyo, Head Office (KAWASAKI STEEL CORPORATION Hibiya Kokusai Building 2-, Uchisaiwaicho 2-chome Chiyoda-ku Tokyo, JP)
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