| 摘要 |
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 |
