Electrogalvanized steel sheet having superb whiteness and method for manufacturing same

Abstract

The present invention provides an electrogalvanized steel sheet and a method manufacturing same, the electrogalvanized steel sheet having superb whiteness, and an attractive exterior surface due to reduction in surface scale.

1 . A method for manufacturing an electrogalvanized steel sheet having excellent whiteness, comprising operations of:
 preparing a base steel sheet having a grain size of 10 to 20 μm in an internal structure;   forming a nickel coating layer having an adhesion amount of 50 to 300 mg/m 2 on the base steel sheet by electroplating; and   forming a galvanized layer on the nickel coating layer by electroplating,   wherein the galvanized layer is formed by using a galvanizing bath containing Fe ions in a concentration of less than 500 ppm; and Na, Ca, and Mg ions at a combined concentration of 50 to 150 ppm.   
     
     
         2 . The method for manufacturing an electrogalvanized steel sheet having excellent whiteness of  claim 1 , further comprising:
 forming a single layer or a plurality of resin layers on the galvanized layer.   
     
     
         3 . The method for forming an electrogalvanized steel sheet having excellent whiteness of  claim 1 , wherein the electroplating is performed using a sulfuric acid bath.