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Title:
HOT-DIP GALVANIZED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2016/159298
Kind Code:
A1
Abstract:
[Problem] To provide a hot-dip galvanized steel sheet that inhibits, in a simple manner, excessive generation of zinc oxide on a surface layer after hot pressing and that has superior corrosion resistance at an unpainted portion. [Solution] A hot-dip galvanized steel sheet according to the present invention comprises a base steel sheet that is a substrate, a hot-dip galvanized layer provided on the base steel sheet, and a surface-treated layer formed on the hot-dip galvanized layer on at least one side, wherein the surface-treated layer contains 0.1-1.2 g/m2 inclusive per side, in terms of metal, of a granular oxide of which the standard free energy of formation (ΔG0) is lower than the standard free energy of formation of zinc oxide (ΔG0 Zn) and larger than the standard free energy of formation of aluminium oxide (ΔG0 Al) at the same temperature in the temperature range of 900-1300 K, and wherein the particle diameter of the granular oxide is 3-100 nm inclusive.

Inventors:
AKIOKA KOJI (JP)
KAWAMURA YASUAKI (JP)
SENGOKU AKIHIRO (JP)
Application Number:
PCT/JP2016/060798
Publication Date:
October 06, 2016
Filing Date:
March 31, 2016
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C23C28/00; C22C38/00; C22C38/58
Domestic Patent References:
WO2012004889A12012-01-12
Foreign References:
JPH11302870A1999-11-02
JP2004270029A2004-09-30
JP2007039780A2007-02-15
Other References:
See also references of EP 3263742A4
Attorney, Agent or Firm:
KAMEYA, Yoshiaki et al. (JP)
Yoshiaki Kameya (JP)
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