US 9,809,884 B2
Method for manufacturing galvanized steel sheet
Katsuya Hoshino, Fukuyama (JP); Shoichiro Taira, Tokyo (JP); Wataru Tanimoto, Fukuyama (JP); and Masayasu Nagoshi, Kawasaki (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 14/761,133
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Jan. 14, 2014, PCT No. PCT/JP2014/000104
§ 371(c)(1), (2) Date Jul. 15, 2015,
PCT Pub. No. WO2014/112347, PCT Pub. Date Jul. 24, 2014.
Claims priority of application No. 2013-005389 (JP), filed on Jan. 16, 2013.
Prior Publication US 2016/0024660 A1, Jan. 28, 2016
Int. Cl. C23C 8/80 (2006.01); B08B 3/08 (2006.01); C23C 22/60 (2006.01); C23C 22/07 (2006.01); C23C 22/83 (2006.01); C23C 22/53 (2006.01); C23C 2/06 (2006.01); C23C 2/26 (2006.01); C23C 22/78 (2006.01); C23C 28/00 (2006.01)
CPC C23C 22/07 (2013.01) [C23C 2/06 (2013.01); C23C 2/26 (2013.01); C23C 22/53 (2013.01); C23C 22/60 (2013.01); C23C 22/78 (2013.01); C23C 22/83 (2013.01); C23C 28/321 (2013.01); C23C 28/345 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for manufacturing a galvanized steel sheet that includes an oxide layer on the surface thereof, comprising:
an oxide layer forming step of bringing a galvanized steel sheet into contact with an acidic solution for 1 to 60 seconds, and then washing the galvanized steel sheet with water; and
a neutralization treatment step of bringing a surface of an oxide layer, formed in the oxide layer forming step, into contact with an alkaline aqueous solution for 0.5 seconds or more, washing the surface of the oxide layer with water, and drying the surface of the oxide layer;
wherein the alkaline aqueous solution contains 0.01 g/L or more of P ions and 0.01 g/L or more of colloid dispersed particles.