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Title:
PRODUCTION OF GALVANIZED STEEL SHEET
Document Type and Number:
Japanese Patent JP3191648
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: An Fe-Ni-O film is formed by performing electrolysis in an aqueous solution in which the total concentration of nickel sulfate, ferrous sulfate, and ferric sulfate in the aqueous solution is (0.3 to 2.0)mol/l and the ratio of the concentration (mol/l) of Fe3+ to the total concentration (mol/l) of Fe2+ and Fe3+ is regulated to 0.5-<1.0 and also pH is regulated to 1.0-2.0. In this method, a galvanized steel sheet, having a plating layer consisting of galvannealing layer of 7-15wt.% Fe content, electrogalvanizing layer, or hot dip galvanizing layer, is used.


Inventors:
Urakawa, Takayuki
Imokawa, Toru
Sakurai, Michitaka
Inagaki, Junichi
Yamashita, Masaaki
Application Number:
JP1995000304072
Publication Date:
July 23, 2001
Filing Date:
November 22, 1995
Export Citation:
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Assignee:
NKK CORP
International Classes:
C25D11/34; C25D3/56; C25D5/26; C25D5/48; C25D9/10; (IPC1-7): C25D3/56; C25D5/26; C25D5/48
Attorney, Agent or Firm:
石川 泰男