Toyota Jidosha Kabushiki Kaisha

Nihon Parkerizing Co., Ltd.

Daihatsu Motor Company, Ltd.

Katsuhiro Shiota

Eisaku Okada

Takaomi Nakayama

Tadashi Matsushita

Fumiya Yoshida

Hiroyuki Sato

Kazuhiro Ishikura

Tetsuo Ootsuki

Michiro Kurosawa

A composition for surface treatment of aluminium, aluminum alloys, magnesium or magnesium alloys and the treating solutions being diluted to the desired concentration are defined. The composition contains (1) compound A containing at least one metal element selected from the group consisting of Hf(IV), Ti(IV) and Zr(IV), (2) a fluorine-containing compound of sufficient amount to make fluorine exist in the composition in an amount of at least 5 times the molarity of the total molarity of the metal contained in the above-mentioned 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) nitric ion and the mol concentration of compound A is 0.1-50 mmol/L as the metal element of Hf(IV), Ti(IV) and Zr(IV). A metal treated with the treating method of the present invention solution has an excellent resistance to various corrosive environments.

Surface treating solution for surface treatment of aluminum or magnesium metal and a method for surface treatment

The present invention is the method for surface treatment of a metal material containing iron and/or zinc, containing component (A) and component (B); where

Treating solution for metal surface treatment and a method for surface treatment

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Ikeda, Japan

Katsuhiro Shiota