Title:
PRODUCTION OF GALVANIZED STEEL SHEET
Document Type and Number:
Japanese Patent JP3191647
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To further form a film excellent in press formability, spot weldability, and adhesion on the surface of a plating layer of a galvanized steel sheet.
SOLUTION: A galvanized steel sheet is immersed in an aqueous solution of 20-70°C and pH1.0-3.5, which contains either or both of ferrous sulfate and ferrous nitrate and either or both of Ni sulfate and Ni nitrate and in which the sum of Fe content and Ni content is regulated to (0.1 to 3.0)mol/l and also the ratio of Fe content (mol/l) to the sum of Fe content (mol/l) and Ni content (mol/l) is regulated to 0.004-0.9. By this procedure, an Fe-Ni-O film is formed on the surface of the plating layer of the galvanized steel sheet.
Inventors:
Toru Imokawa
Michitaka Sakurai
Takayuki Urakawa
Junichi Inagaki
Masaaki Yamashita
Michitaka Sakurai
Takayuki Urakawa
Junichi Inagaki
Masaaki Yamashita
Application Number:
JP30313295A
Publication Date:
July 23, 2001
Filing Date:
November 21, 1995
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
C25D5/26; C23C2/06; C23C2/26; C23C22/53; C23C28/00; C25D5/48; (IPC1-7): C25D5/26; C23C2/06; C23C2/26; C23C28/00; C25D5/48
Domestic Patent References:
| JP441683A | ||||
| JP941186A | ||||
| JP8158066A | ||||
| JP5530596B2 | ||||
| JP450387B2 |
Attorney, Agent or Firm:
Yasuo Ishikawa