US 12,305,294 B2
Composition for surface treatment of Mg-containing galvanized steel sheet and Mg-containing galvanized steel sheet surface-treated using same
Young-Jun Park, Gwangyang-si (KR); and Yong-Woon Kim, Gwangyang-si (KR)
Assigned to POSCO CO., LTD, Pohang-si (KR)
Appl. No. 17/271,353
Filed by POSCO, Pohang-si (KR)
PCT Filed Aug. 16, 2019, PCT No. PCT/KR2019/010439
§ 371(c)(1), (2) Date Feb. 25, 2021,
PCT Pub. No. WO2020/045869, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 10-2018-0103752 (KR), filed on Aug. 31, 2018.
Prior Publication US 2021/0348280 A1, Nov. 11, 2021
Int. Cl. C23C 30/00 (2006.01); C08F 2/22 (2006.01); C09D 5/08 (2006.01); C09D 127/16 (2006.01); C09K 15/32 (2006.01); C23C 2/26 (2006.01); C25D 3/56 (2006.01); C25D 5/48 (2006.01); C08F 214/22 (2006.01)
CPC C23C 30/005 (2013.01) [C09D 5/08 (2013.01); C09D 127/16 (2013.01); C09K 15/326 (2013.01); C23C 2/26 (2013.01); C25D 3/56 (2013.01); C25D 5/48 (2013.01); C08F 2/22 (2013.01); C08F 214/225 (2013.01); C23C 2222/10 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A composition for surface treatment of a Mg-containing galvanized steel sheet, the composition comprising a trivalent chromium compound, a carboxylated vinylidene copolymer, and a crosslinking agent,
wherein the carboxylated vinylidene copolymer is included in an amount of 5 wt. % to 10 wt. % based on the composition,
wherein the crosslinking agent is included in an amount of 1 wt. % to 5 wt. % based on the weight of the carboxylated vinylidene copolymer, and
wherein the trivalent chromium compound is included in an amount of 10 wt. % to 20 wt. % based on the composition.