US 12,303,933 B2
Graphene-coated steel sheet and method for producing same
Hye-Jin Yoo, Gwangyang-si (KR); Jung-Su Kim, Gwangyang-si (KR); Je-Hoon Baek, Gwangyang-si (KR); and Chang-Se Byeon, Gwangyang-si (KR)
Assigned to POSCO, Pohang-si (KR)
Appl. No. 17/781,921
Filed by POSCO, Pohang-si (KR)
PCT Filed Oct. 20, 2020, PCT No. PCT/KR2020/014340
§ 371(c)(1), (2) Date Jun. 2, 2022,
PCT Pub. No. WO2021/112399, PCT Pub. Date Jun. 10, 2021.
Claims priority of application No. 10-2019-0160826 (KR), filed on Dec. 5, 2019.
Prior Publication US 2023/0001445 A1, Jan. 5, 2023
Int. Cl. B05D 1/18 (2006.01); B05D 3/04 (2006.01); B05D 3/06 (2006.01); B05D 7/00 (2006.01); C23C 28/00 (2006.01)
CPC B05D 1/185 (2013.01) [B05D 3/044 (2013.01); B05D 3/06 (2013.01); B05D 3/062 (2013.01); B05D 7/50 (2013.01); C23C 28/345 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for manufacturing a graphene-coated steel sheet, the method comprising:
surface-modifying a steel sheet to have a negative charge;
forming a first graphene oxide layer having a positive charge on the surface-modified steel sheet;
forming a second graphene oxide layer having a negative charge on the first graphene oxide layer; and
heat-treating the steel sheet on which the first and second graphene oxide layers are formed,
wherein the graphene-coated steel sheet comprises a coating layer coated on the steel sheet,
wherein the coating layer comprises the first graphene oxide layer and the second graphene oxide layer, and
wherein the coating layer has a thickness of 0.5 μm to 5.0 μm.