METHOD FOR PRODUCING SURFACE-TREATED STEEL PLATE

WIPO Patent Application WO/2016/013561

A1

Provided is a method for producing a surface-treated steel plate which involves immersing a steel plate (1) in an electrolytic treatment solution (31) containing Zr ions and F ions, continuously performing an electrolytic treatment (31), and as a result, forming a film having a ZrO compound as the principal component thereof on the steel plate (1), in a manner such that the amount of Zr in the film is 30mg/m2 or more, the method for producing the surface-treated steel plate being characterized in that: the concentration of Zr ions in the electrolytic treatment solution (31) is 3,000-10,000 wt ppm; the pH is 2-4; and the electrolytic treatment solution (31) is continuously supplied with a first supply fluid having a pH of 5 or less and containing a zirconium fluoride compound (A) in an amount such that the Zr ion concentration thereof is in the range of 10,000-250,000 wt ppm, and a second supply fluid having a pH of 5 or less and containing a non-fluorinated zirconium compound (B) in an amount such that the Zr ion concentration thereof is in the range of 10,000-200,000 wt ppm.

YOSHIMURA KUNIHIRO (JP)
HARADA SATOKO (JP)
YOSHIDA KEISUKE (JP)
MATSUKAWA MASAHIKO (JP)
UCHIKAWA MIWA (JP)

PCT/JP2015/070780

January 28, 2016

July 22, 2015

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TOYO KOHAN CO LTD (JP)
NIPPON PAINT SURF CHEMICALS CO LTD (JP)

C25D9/10; B01D61/02; B01D69/02; C25D21/14; C25D21/18

WO2011149047A1

2011-12-01

JP4996409B2	2012-08-08
US20110259756A1	2011-10-27
JP5215509B1	2013-06-19
JP2007262577A	2007-10-11

TOKOSHIE PATENT FIRM (JP)
It can exceed and is a patent business corporation. (JP)

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