SUPPLEMENT AND METHOD FOR PRODUCING SURFACE-TREATED STEEL SHEET

Title:

SUPPLEMENT AND METHOD FOR PRODUCING SURFACE-TREATED STEEL SHEET

Document Type and Number:

WIPO Patent Application WO/2013/080325

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide a supplement which is capable of supplying Zr ions to a metal surface treatment solution, while suppressing an increase in the HF concentration in the metal surface treatment solution, so that a chemical conversion coating film can be continuously formed on a steel sheet by electrolysis. A supplement of the present invention is a supplement which is used for the purpose of supplying zirconium ions to a metal surface treatment solution that contains zirconium ions and fluorine ions, and the supplement contains (A) zirconium hydrofluoric acid or a salt thereof and/or (B) hydrofluoric acid or a salt thereof and (C) a fluorine-free zirconium compound. The total concentration (g/l) of zirconium ions derived from the components (A) and (C) is 20 or more, and the ratio of the total molar amount (MF) of the fluorine ions derived from the components (A) and (B) relative to the total molar amount (MZr) of the zirconium ions derived from the components (A) and (C), namely MF/MZr is 0.01 or more but less than 4.00.

Inventors:

YOSHIDA YUTA (JP)
SUNADA HIROKI (JP)
YAMAMOTO SHIGEKI (JP)
YAMAGUCHI HIDEHIRO (JP)

Application Number:

PCT/JP2011/077639

Publication Date:

June 06, 2013

Filing Date:

November 30, 2011

Export Citation:

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Assignee:

NIHON PARKERIZING (JP)
YOSHIDA YUTA (JP)
SUNADA HIROKI (JP)
YAMAMOTO SHIGEKI (JP)
YAMAGUCHI HIDEHIRO (JP)

International Classes:

C25D9/10

Foreign References:

JP2009084623A	2009-04-23
JP2005344186A	2005-12-15
JP2006161067A	2006-06-22
JP2009084623A	2009-04-23

Other References: