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 (())
大久保 謙一 (())
OWA, Katsumi (())
大久保 謙一 (())
OWA, Katsumi (())
Application Number:
JP2011/003750
Publication Date:
January 05, 2012
Filing Date:
June 30, 2011
Export Citation:
Assignee:
NISSHIN STEEL CO., LTD. (3-4-1, Marunouchi Chiyoda-k, Tokyo 66, 〒1008366, JP)
日新製鋼株式会社 (〒66 東京都千代田区丸の内三丁目４番１号 Tokyo, 〒1008366, JP)
OKUBO, Kenichi (())
大久保 謙一 (())
日新製鋼株式会社 (〒66 東京都千代田区丸の内三丁目４番１号 Tokyo, 〒1008366, JP)
OKUBO, Kenichi (())
大久保 謙一 (())
International Classes:
C23C22/34; B32B15/08; C23C28/00
Attorney, Agent or Firm:
WASHIDA, Kimihito (8th Floor, Shinjuku First West Bldg. 1-23-7, Nishi-Shinjuku, Shinjuku-k, Tokyo 23, 〒1600023, JP)
Claims:
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