Kansai Paint Company, Ltd.

Jfe Steel Corporation

Shingo Amaki

Kaoru Sato

Masaaki Yamashita

Akira Matsuzaki

Takahiro Kubota

Naoto Yoshimi

Reijiro Nishida

Shoichi Tanaka

Hisato Noro

Haruo Nakamichi

Masahiro Murata

Hiroyasu Matsuki

Yoshikazu Morohoshi

Okai Kazuhisa

Mika Yamazaki

Kazuaki Keicho

An aqueous coating material composition, includes: a polyolefin resin aqueous dispersion (A) containing a polypropylene (a1); a crosslinking agent (B) having a functional group that reacts with a carboxyl group; and a polyester resin aqueous dispersion (C) having a resin acid value of 3 mgKOHg to 100 mgKOH/g, and with respect to a total solid content of the polyolefin resin aqueous dispersion (A), a solid content of the crosslinking agent (B) is 0.1 mass % to 20 mass %, and a solid content of the polyester resin aqueous dispersion (C) is 0.5 mass % to 30 mass %.

Aqueous coating material composition

The invention is to provide a surface-treated steel sheet of good white rust resistance with no chromium in its surface treatment film, and it has realized a surface-treated steel sheet of higher-level corrosion resistance by forming a reaction layer of plating metal with a barrier layer effective for anticorrosion not in a two-layered film but in a single-layered film. The surface-treated steel sheet is fabricated by applying a surface-treating composition that contains:

Surface-treated steel sheets of good white rust resistance, and method for producing them

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Hiratsuka, Japan

Shingo Amaki