Toyota Jidosha Kabushiki Kaisha

Nihon Parkerizing Co., Ltd.

Michiro Kurosawa

Eisaku Okada

Hiroyuki Sato

Tadashi Matsushita

Takaomi Nakayama

Kazuhiro Ishikura

Fumiya Yoshida

Katsuhiro Shiota

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

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Tokyo, Japan

Michiro Kurosawa