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US 12,497,708 B2Granted
Electrogalvanized steel sheet having superb whiteness and method for manufacturing same
AssigneePosco
InventorsMoon-Jae Kwon, Su-Young Kim, Chan-Seok Bang
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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.
Claims3
An electrogalvanized steel sheet having excellent whiteness, comprising:
- a base steel sheet having a grain size of 10 to 20 μm in an internal structure;
- a nickel coating layer having an adhesion amount of 50 to 300 mg/m2 provided on the base steel sheet;
- and
- a galvanized layer provided on the nickel coating layer,
- wherein the galvanized layer is formed from a galvanizing bath that includes 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, and
- wherein a whiteness L value is 88.0 or more measured by a Minolta CR-400 colorimeter, and the whiteness is measured based in the galvanized layer.
3 more elements
Dependencies are inferred from the claim text.