Jfe Steel Corporation

Rie Kaneko

Takeshi Matsuda

Akira Matsuzaki

Takahiro Kubota

Yasuhide Oshima

Nobue Fujibayashi

Kazuhisa Okai

Reona Endo

Fuyuko Ikeda

Disclosed is a method of producing a surface-treated steel sheet for organic resin coating comprising: applying, to a surface of a zinc or zinc alloy coated or plated steel sheet, a surface-treatment solution containing a resin compound having a specific bisphenol skeleton, a cationic urethane resin emulsion, a silane coupling agent having a specific reactive functional group, an organic titanium chelate compound, a tetravalent vanadium compound, a molybdate compound, a fluorine compound, and water in a specific ratio and with a pH of 4 to 5 to form a surface-treatment layer such that a coating weight of the surface-treatment layer per surface after drying of the surface-treatment solution is 0.005 g/mto 1.8 g/m.

Surface-treated steel sheet for organic resin coating and method of producing same, and organic resin coated steel sheet and method of producing same

A method of producing a hot-dip galvanized steel sheet includes applying, to a hot-dip galvanized steel sheet having a Ra of 0.5 to 2.0 &#x3bc;m and a PPI of 150 or more, a predetermined surface treatment agent, i.e., a surface treatment agent containing a specified resin compound, a specified urethane resin having cationy, a specified silane coupling agent having a functional group, a specified organic Ti chelate compound, and a tetravalent vanadyl compound at a specified ratio; and drying the surface treatment agent at a ultimate sheet temperature of 50&#xb0; C. to 180&#xb0; C. to form a surface treatment coating film with a coating weight of 0.2 to 1.0 g/mon the surface of the steel sheet.

Hot-dip galvanized steel sheet and method for producing the same

A zinc or zinc alloy coated steel sheet has a surface-treatment film formed thereon in a coating weight per one surface of 100 to 600 mg/m. The surface-treatment film is obtained by applying, onto a surface of the zinc or zinc alloy coated steel sheet, the surface-treatment solution prepared by mixing the following components at specific ratios, the surface-treatment solution having pH of 8 to 10: a silane compound (A) having a hydrolyzable group, obtained from a silane coupling agent (a1) having a glycidyl group, a tetraalkoxysilane (a2), and a chelating agent (a3); a zirconium carbonate compound (B); a vanadate compound (C); a nitric compound (D); and water, and by subsequently heating and drying the surface-treatment solution thus applied.

Surface-treatment solution for zinc or zinc alloy coated steel sheet and method for manufacturing zinc or zinc alloy coated steel sheet

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Kawasaki, Japan

Rie Kaneko