Nihon Parkerizing Co., Ltd.

Nippon Steel & Sumikin Coated Sheet Corporation

Eisuke Kudo

Daisuke Shimizu

Hiromasa Nomura

Tomohiro Iko

Shigeki Yamamoto

Hiroyuki Oyokawa

Yoshikazu Namai

An aqueous surface treatment composition for coated steel sheet securing sufficient working adhesion while causing the formation of a surface treatment layer imparting excellent overhang corrosion resistance even without containing chrome, that is, a surface treatment composition containing a specific organic silicon compound, hexafluorometallic acid, a urethane resin having specific cationic groups, a vanadium compound, and an aqueous medium and sufficiently securing working adhesion while imparting excellent overhang corrosion resistance by the urethane resin having cationic groups and a total amine value of specific values is provided.

Surface treatment composition for coated steel sheet, surface treated plated steel sheet and method of production of same, and coated plated steel sheet and method of production of same

Provided is a surface treatment agent for a metal material with which it is possible to produce a surface-treated metal material that has excellent initial anti-rust properties without being coated with an anti-rust oil, excellent lubrication properties, and excellent anti-corrosion and adhesion properties in a coating film for which phosphate-based chemical conversion treatment, zirconium-based chemical conversion treatment, or other coating underlay processing is omitted. This surface treatment agent for a metal material contains: a zirconium compound; an aqueous epoxy resin having in the skeleton thereof a carboxyl-group-containing polymer that includes a repeated unit derived from a carboxyl-group-containing vinyl monomer, said aqueous epoxy resin also having an acid value of 5-50 mg KOH/g; and a hydroxycarboxylic acid.

Surface treatment agent for metal material and production method for surface-treated metal material

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Tokyo, Japan

Eisuke Kudo