Title:
GALVANIZED STEEL SHEET SUBJECTED TO CHEMICAL CONVERSION TREATMENT BY ELECTROLYSIS AND PRODUCTION THEREOF
Document Type and Number:
Japanese Patent JPS63100194
Kind Code:
A
Abstract:
PURPOSE:To produce the titled galvanized steel sheet having superior corrosion resistance in an unpainted state and superior adhesion to a paint film by cathodically electrolyzing a galvanized steel sheet under specified conditions in a bath contg. molybdate ion, silica sol and fluoride each at a specified concn. CONSTITUTION:A galvanized steel sheet is immersed in a bath contg. 5-150g/l in total of one or more among molybdate ion, tungstate ion and vanadate ion, 0.05-50g/l (expressed in terms of oxide) in total of one or more among silica sol, alumina sol, titania sol and zirconia sol, and 0.05-5g/l (expressed in terms of F) fluoride. In the bath, the steel sheet is cathodically electrolyzed with 1-100C/dm<2> electricity at 1-50A/dm<2> current density to form a film contg. oxide and/or hydroxide of one or more among Mo, W and V as the principal component by 10-300mg/m<2> in a short time of <=about 10sec. The amount of one or more among silica, alumina, titania and zirconia in the formed film is about 1/20-1/2 of the total amount of one or more among Mo, W and V.
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Inventors:
KIMURA HAJIME
NAKAHARA YUKI
OKANO SHINOBU
NAKAHARA YUKI
OKANO SHINOBU
Application Number:
JP24610686A
Publication Date:
May 02, 1988
Filing Date:
October 16, 1986
Export Citation:
Assignee:
KAWASAKI STEEL CO
International Classes:
C25D9/08; C25D11/00; (IPC1-7): C25D9/08; C25D11/00
Attorney, Agent or Firm:
Watanabe Noboru Minoru