Title:
SURFACE-TREATED STEEL SHEET EXCELLENT IN SEAM WELDABILITY, ADHESIVE STRENGTH OF PAINT AND APPEARANCE AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3670805
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To produce a surface-treated steel sheet excellent in seam weldability, adhesive strength of paint and scratch resistance by applying a moniliform granular tin plating under specified conditions and then conducting ordinary chromium plating or chromium plating and chromating.
SOLUTION: Tinning is conducted by using an acidic tinning bath prepared by adding an additive as a brightener to be generally used by 0.05-0.20 g/l to coat a steel sheet with moniliform tin having 0.4-2.4 μm grain diameter at 2-20% area rate, and further chromium plating or chromium plating and chromating are performed to deposit 30-150 mg/m2 metallic chromium and 2-40 mg/m2 chromium oxide as chromium. A surface-treated steel sheet having the excellent appearance, adhesive strength of paint and coated corrosion resistance of the conventional tin-free steel sheet and exhibiting stabilized weldability is produced at a low cost.
Inventors:
Shinichi Yamaguchi
Shigeru Hirano
Tetsuhiro Fuchigami
Shigeru Hirano
Tetsuhiro Fuchigami
Application Number:
JP17557997A
Publication Date:
July 13, 2005
Filing Date:
July 01, 1997
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C25D11/38; C23C28/00; C25D5/14; C25D5/26; (IPC1-7): C25D11/38; C25D5/14; C25D5/26
Domestic Patent References:
| JP2016397B2 | ||||
| JP5230695A | ||||
| JP2159386A | ||||
| JP7243093A |
Attorney, Agent or Firm:
Shiina Akira
Ning Yoshishima
Ning Yoshishima
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