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US 2023/0027626 A1Published application
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.
Claims5
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 a whiteness L value is 86.5 or more.
2 more elements
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/m2 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.
3 more elements
Dependencies are inferred from the claim text.