TREATING LIQUID FOR SURFACE TREATMENT OF ALUMINUM OR MAGNESIUM BASED METAL AND METHOD OF SURFACE TREATMENT

Title:

TREATING LIQUID FOR SURFACE TREATMENT OF ALUMINUM OR MAGNESIUM BASED METAL AND METHOD OF SURFACE TREATMENT

Document Type and Number:

WIPO Patent Application WO/2003/074761

Kind Code:

A1

Abstract:

A method of surface treatment which comprises contacting aluminum, an aluminum ally, magnesium or a magnesium alloy with a treating liquid comprising (1) a compound (A) containing at least one metal atom of Hf(IV), Ti(IV) and Zr(IV), (2) a fluorine-containing compound in an amount sufficient for causing fluorine to be present in the treating liquid in a molar concentration which is at least five times that of the total metal contained in the compound A, (3) at least one metal ion (B) selected from the group of alkaline earth metals, (4) at least one metal ion (C) selected from the group consisting of Al, Zn, Mg, Mn and Cu, and (5) a nitrate ion, wherein the compound (A) is present in a molar concentration of 0.1 to 50 mmol/L in terms of the at least one metal atom of Hf(IV), Ti(IV) and Zr(IV). The method allows the formation of a surface treatment coating excellent in the corrosion resistance in both a bare state and a painted state, without the production of wastes such as a sludge and without the use of a harmful component.

Inventors:

ISHIKURA KAZUHIRO (JP)
KUROSAWA MICHIRO (JP)
NAKAYAMA TAKAOMI (JP)
SATO HIROYUKI (JP)
MATSUSHITA TADASHI (JP)
OKADA EISAKU (JP)
YOSHIDA FUMIYA (JP)
SHIOTA KATSUHIRO (JP)

Application Number:

PCT/JP2002/005861

Publication Date:

September 12, 2003

Filing Date:

June 12, 2002

Export Citation:

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Assignee:

NIHON PARKERIZING (JP)
TOYOTA MOTOR CO LTD (JP)
DAIHATSU MOTOR CO LTD (JP)
ISHIKURA KAZUHIRO (JP)
KUROSAWA MICHIRO (JP)
NAKAYAMA TAKAOMI (JP)
SATO HIROYUKI (JP)
MATSUSHITA TADASHI (JP)
OKADA EISAKU (JP)
YOSHIDA FUMIYA (JP)
SHIOTA KATSUHIRO (JP)

International Classes:

C23C22/34; C23C22/44; (IPC1-7): C23C22/34; C23C22/56; C23C22/57; B05D3/10

Domestic Patent References:

WO1995014539A1

1995-06-01

Foreign References:

US5449415A	1995-09-12
US4191596A	1980-03-04
JPS5794575A	1982-06-12

Other References: