Title:
COATED STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE AND ALKALI RESISTANCE
Document Type and Number:
WIPO Patent Application WO/2012/001981
Kind Code:
A1
Abstract:
Disclosed is a coated steel sheet which can keep corrosion resistance even under strongly alkaline corrosive environments and has excellent corrosion resistance and alkali resistance. The coated steel sheet comprises a steel sheet, a chemical-conversion-treated coating film formed on the surface of the steel sheet, a primer coating film formed on the surface of the chemical-conversion-treated coating film, and a top coating film formed on the surface of the primer coating film. The chemical-conversion-treated coating film comprises a fluoride of titanium or a fluoride of zirconium, an oxide or hydroxide of titanium, and an oxide or hydroxide of zirconium. The primer coating film comprises an organic resin, an anti-corrosive pigment comprising one or two compounds independently selected from the group consisting of magnesium phosphate and zirconium phosphate, and barium sulfate.
Inventors:
OKUBO KENICHI
OWA KATSUMI
UEDA KOICHIRO
OWA KATSUMI
UEDA KOICHIRO
Application Number:
PCT/JP2011/003750
Publication Date:
January 05, 2012
Filing Date:
June 30, 2011
Export Citation:
Assignee:
NISSHIN STEEL CO LTD (JP)
OKUBO KENICHI
OWA KATSUMI
UEDA KOICHIRO
OKUBO KENICHI
OWA KATSUMI
UEDA KOICHIRO
International Classes:
C23C22/34; B32B15/08; C23C28/00
Foreign References:
| JP2006116736A | 2006-05-11 | |||
| JP2003010774A | 2003-01-14 | |||
| JP2009078263A | 2009-04-16 | |||
| JP2003094557A | 2003-04-03 | |||
| JP2005186288A | 2005-07-14 | |||
| JP2005186287A | 2005-07-14 |
Attorney, Agent or Firm:
WASHIDA, KIMIHITO (JP)
Koichi Washida (JP)
Koichi Washida (JP)
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Claims:
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