Toyo Kohan Co., Ltd.

Toyo Seikan Group Holdings, Ltd.

Nippon Paint Surf Chemicals Co., Ltd.

Naomi Iida

Masahiko Matsukawa

Wataru Kurokawa

Kunihiro Yoshimura

Shinichi Taya

Seitaro Kanazawa

Miwa Iida

To provide a bath for surface treatment capable of forming a surface-treating film having excellent corrosion resistance by a high-speed electrolytic treatment, and a method of producing a surface-treated steel plate having excellent corrosion resistance and closely adhering property to the coating maintaining good productivity. A bath for surface treatment used for forming a surface-treating film on the surface of a steel plate by cathodic electrolysis, the bath for surface treatment containing Zr and/or Ti, and a polycarboxylic acid.

Bath for surface treatment, method of producing surface-treated steel plate by using the bath for surface treatment, and surface treated steel plate produced by the same method

A surface-treated steel plate obtained by forming, on at least one surface of the steel plate by cathodic electrolysis, a surface-treating film which contains a mixed oxide of an oxide of Fe and at least one of an oxide of Zr or an oxide of Ti, and a polycarboxylic acid, the amount of Zr or Ti, or the total amount of Zr and Ti if both of them are present, being from 3 to 300 mg/mand the amount of C being from 0.1 to 5.0 mg/m.

Surface-treated steel plate

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Kudamatsu, Japan

Naomi Iida