公开(公告)号：US20170314138A1

公开(公告)日：2017-11-02

申请号：US15526140

申请日：2015-11-09

Applicant: JFE STEEL CORPORATION

Inventor： Katsuya Hoshino ,  Shoichiro Taira ,  Shinichi Furuya

IPC: C23C22/83 ,  C23C22/60

CPC classification number: C23C22/83 ,  C23C22/53 ,  C23C22/60 ,  C23C22/78 ,  C23G1/20

Abstract: A steel sheet coated with a zinc-based coating layer having a reaction layer on the surface of the steel sheet is manufactured by a method that includes bringing a steel sheet coated with a zinc-based coating layer into contact for 1.0 second or more with an alkaline aqueous solution containing one or more chelating agents selected from among sodium gluconate, sodium glucoheptonate, sodium citrate, tartaric acid, arabonic acid, galactonic acid, sorbit, mannite, glycerin, EDTA, and sodium tripolyphosphate in a total amount of 0.050 mass % or more and having a pH of 10.0 or more as a pre-treatment before a formation of the reaction layer, and forming the reaction layer being an oxide layer containing a crystal-structured substance expressed by Zn4(SO4)1-X(CO3)X(OH)6.nH2O.

公开(公告)号：US20170306507A1

公开(公告)日：2017-10-26

申请号：US15507601

申请日：2015-08-12

Applicant: JFE Steel Corporation

Inventor： Hiroyuki Masuoka ,  Shoichiro Taira ,  Shinichi Furuya

IPC: C23G1/00 ,  C23G1/08 ,  C22C38/32 ,  C22C38/16 ,  C21D9/46 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/14 ,  C23G1/19

CPC classification number: C23G1/00 ,  C21D9/46 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/32 ,  C22C38/34 ,  C23G1/08 ,  C23G1/081 ,  C23G1/085 ,  C23G1/086 ,  C23G1/19 ,  C23G3/02

Abstract: A cold-rolled steel sheet has excellent chemical convertibility and excellent corrosion resistance after coating. A method of manufacturing a cold-rolled steel sheet includes first pickling applied to a steel sheet which is continuously annealed after cold rolling, second pickling applied to the steel sheet subsequently and, thereafter, neutralizing treatment applied to the steel sheet using an alkaline solution.

公开(公告)号：US20160369406A1

公开(公告)日：2016-12-22

申请号：US15121589

申请日：2015-02-27

Applicant: JFE STEEL CORPORATION

Inventor： Katsuya Hoshino ,  Shoichiro Taira ,  Masayasu Nagoshi ,  Kazutoshi Hanada

IPC: C23C22/50 ,  C23C2/26 ,  C23C22/83 ,  C23C22/62 ,  C23C22/78 ,  C23C2/06 ,  C23C2/40

CPC classification number: C23C22/50 ,  C23C2/06 ,  C23C2/26 ,  C23C2/40 ,  C23C22/53 ,  C23C22/62 ,  C23C22/78 ,  C23C22/83 ,  C23C28/3225 ,  C23C28/345

Abstract: A method for producing a galvanized steel sheet includes an oxide layer forming step of bringing a galvanized steel sheet into contact with an acidic solution containing sulfate ions, then holding the galvanized steel sheet in contact for 1 to 60 seconds, and then washing the galvanized steel sheet with water; and a neutralization treatment step of holding a surface of an oxide layer, which has been formed in the oxide layer forming step, in contact with an alkaline aqueous solution for 0.5 seconds or longer, and then performing washing with water and drying. The alkaline aqueous solution contains P ions at a P concentration of 0.01 g/L or more and carbonate ions at a carbonate ion concentration of 0.1 g/L or more.

Abstract translation: 镀锌钢板的制造方法包括使镀锌钢板与含有硫酸根离子的酸性溶液接触的氧化物层形成工序，然后将镀锌钢板保持1〜60秒，然后洗涤镀锌钢板 水表; 和在氧化物层形成工序中形成的氧化物层的表面与碱性水溶液接触0.5秒以上，然后用水洗涤并干燥的中和处理工序。 碱性水溶液含有P浓度为0.01g / L以上的P离子和碳酸根离子浓度为0.1g / L以上的碳酸根离子。