Invention Grant
- Patent Title: Method for manufacturing zinc-based coated steel sheet
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Application No.: US16082632Application Date: 2017-02-16
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Publication No.: US10443116B2Publication Date: 2019-10-15
- Inventor: Katsuya Hoshino , Shinichi Furuya , Takeshi Matsuda , Kazuaki Tsuchimoto , Akira Matsuzaki
- Applicant: JFE Steel Corporation
- Applicant Address: JP Tokyo
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: RatnerPrestia
- Priority: JP2016-047816 20160311
- International Application: PCT/JP2017/005604 WO 20170216
- International Announcement: WO2017/154495 WO 20170914
- Main IPC: C23C22/06
- IPC: C23C22/06 ; C23C22/53 ; C23C22/83 ; C23C2/06 ; C23C22/34 ; C23C2/26 ; C23C22/82

Abstract:
Provided is a method for manufacturing a zinc-based coated steel sheet having excellent press formability. The method includes an oxide layer-forming step of bringing the zinc-based coated steel sheet into contact with an acidic solution, holding the zinc-based coated steel sheet for 1 second to 60 seconds, and then water-washing the zinc-based coated steel sheet and a neutralization step of holding a zinc-based oxide layer formed in the oxide layer-forming step for 0.5 seconds or more in such a state that a surface of the zinc-based oxide layer is in contact with an alkaline aqueous solution, water-washing the zinc-based oxide layer, and then drying the zinc-based oxide layer. The acidic solution contains HF2Na and/or HF2K in a total amount of 0.10 g/L to 5.0 g/L.
Public/Granted literature
- US20190093206A1 METHOD FOR MANUFACTURING ZINC-BASED COATED STEEL SHEET Public/Granted day:2019-03-28
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