US 11,897,229 B2
Aluminum alloy-plated steel sheet having excellent workability and corrosion resistance and method for manufacturing same
Suk-Kyu Lee, Gwangyang-si (KR); Hyeon-Seok Hwang, Gwangyang-si (KR); and Myung-Soo Kim, Gwangyang-si (KR)
Assigned to POSCO, Pohang-si (KR)
Appl. No. 17/784,729
Filed by POSCO, Pohang-si (KR)
PCT Filed Dec. 18, 2020, PCT No. PCT/KR2020/018692
§ 371(c)(1), (2) Date Jun. 13, 2022,
PCT Pub. No. WO2021/125888, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 10-2019-0172362 (KR), filed on Dec. 20, 2019.
Prior Publication US 2023/0012544 A1, Jan. 19, 2023
Int. Cl. B32B 15/01 (2006.01); C23C 2/28 (2006.01); C22C 21/02 (2006.01); C22C 21/10 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/14 (2006.01); C23C 2/12 (2006.01); C23C 2/40 (2006.01); C23C 2/26 (2006.01)
CPC B32B 15/012 (2013.01) [C22C 21/02 (2013.01); C22C 21/10 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/14 (2013.01); C23C 2/12 (2013.01); C23C 2/26 (2013.01); C23C 2/261 (2022.08); C23C 2/29 (2022.08); C23C 2/40 (2013.01); B32B 2307/718 (2013.01); B32B 2307/732 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An aluminum alloy-plated steel sheet comprising:
a base steel sheet;
an alloy-plated layer formed on the base steel sheet; and
an unalloy-plated layer formed on the alloy-plated layer,
wherein the alloy-plated layer contains, by wt %, 35 to 50% of Fe, 1 to 20% of Zn, 0.1 to 1.5% of Si, and a balance of Al and unavoidable impurities,
the unalloy-plated layer contains, by wt %, 1 to 30% of Zn, 0.1 to 1.8% of Si, and a balance of Al and unavoidable impurities, and
an interface roughness Ra, between the alloy-plated layer and the base steel sheet is 2.5 μm or less.