Title:
MG-COMPRISING HOT-DIP GALVANIZED STEEL SHEET MANUFACTURING METHOD AND MANUFACTURING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2020/040360
Kind Code:
A1
Abstract:
The present invention relates to a strip-type hot-dip Zn-Al-Mg coated steel sheet manufacturing method, and to a hot-dip metal coated steel sheet manufacturing method and manufacturing apparatus, the hot-dip metal coated steel sheet having excellent corrosion resistance, having a beautiful surface without linear defects, and being usable for a vehicle body, home appliances, construction materials and the like. A hot-dip galvanizing apparatus comprises: a plating pot (1) into which a plating solution (3) for plating a steel sheet (8) is fed; a sink roll (2) for upwardly changing the direction of the inserted steel sheet; a wiping device (4) for adjusting the thickness of the plating solution applied to the steel sheet; and a top roll (7), wherein an oxidation chamber (5) for oxidizing the steel sheet having passed through the wiping device and an air cooling facility (6) for cooling the oxidized steel sheet are provided between the wiping device and the top roll. According to the present invention, after the surplus molten plating solution stuck to the surface of the steel sheet is uniformly removed and before a plated layer starts to be solidified, an oxide has a thickness of 0.1-0.3 ㎛, and thus linear defects can be prevented.
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Inventors:
KIM SANG-HO (KR)
Application Number:
PCT/KR2018/015644
Publication Date:
February 27, 2020
Filing Date:
December 11, 2018
Export Citation:
Assignee:
KIM SANG HO (KR)
International Classes:
C23C2/06; C23C2/00; C23C2/20; C23C2/26; C23C2/40; C23C8/12; C23C8/40; C23C22/53
Foreign References:
| JPH05320854A | 1993-12-07 | |||
| KR20020053633A | 2002-07-05 | |||
| KR20150073036A | 2015-06-30 | |||
| JP2010174262A | 2010-08-12 | |||
| KR20080080416A | 2008-09-03 |
Attorney, Agent or Firm:
HONG, Sung-Chul (KR)
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