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Title:
METHOD FOR MANUFACTURING ELECTROGALVANIZED STEEL SHEET
Document Type and Number:
Japanese Patent JP2016094640
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing an electrogalvanized steel sheet, capable of: manufacturing an electrogalvanized steel sheet having a high degree of whiteness without degrading characteristics of an electrogalvanized layer and without reducing a current efficiency when electrogalvanized; and stably maintaining a high degree of whiteness even when continuously operated.SOLUTION: The method for manufacturing an electrogalvanized steel sheet comprises steps of: forming an electrogalvanized layer on a steel sheet by an electrogalvanizing method; contacting the steel sheet having the electrogalvanized layer for 0.5 seconds or more with an acidic aqueous solution including 0.002-0.05 mol/L of at least one kind of a nitrate ion, an iodate ion, a bromate ion and a chlorate ion in total, including a zinc ion of 0.3-1.5 mol/L and having a pH of 1-3; and forming a chemical conversion coating on the surface of the electrogalvanized layer.SELECTED DRAWING: Figure 1

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Inventors:
IMOKAWA TORU
OKAI KAZUHISA
OKANO TATSUKI
KANEKO RIE
MATSUZAKI AKIRA
Application Number:
JP2014230884A
Publication Date:
May 26, 2016
Filing Date:
November 13, 2014
Export Citation:
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Assignee:
JFE STEEL CORP
International Classes:
C23C22/78; C23C28/00; C25D5/48
Domestic Patent References:
JP2011038167A2011-02-24
JPH05339746A1993-12-21
JPH01283385A1989-11-14
JP2012021175A2012-02-02
JP2009174047A2009-08-06
JPH0949086A1997-02-18
JP2000054186A2000-02-22
JP2006257491A2006-09-28
JP2006265578A2006-10-05
JPH0754193A1995-02-28
JP2012193419A2012-10-11
Foreign References:
WO2013051268A12013-04-11
US4486241A1984-12-04
US4943453A1990-07-24
Attorney, Agent or Firm:
Kenji Sugimura
Kengo Yoshida



 
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