Nippon Steel Sumitomo Metal Corporation

Nihon Parkerizing Co., Ltd.

Nippon Steel & Sumikin Coated Sheet Corporation

Tomokazu Sugitani

Hitoshi Kikuchi

Hiroshi Kanai

Nobuyuki Shimoda

Nobuki Shiragaki

Ichiro Oura

Hiroyuki Oyokawa

Satoru Yonetani

The aluminum-zinc plated steel sheet according to the present invention includes a plated steel sheet and a covering film that covers the plated steel sheet. The covering film contains a basic compound of transition metal other than cobalt and chromium, and metallic cobalt, or metallic cobalt and a cobalt compound. An amount of the covering film per one side is within a range of 0.01 to 0.8 g/m. An amount in terms of mass of transition metal other than cobalt in the covering film per one side of the plated steel sheet is within a range of 4 to 400 mg/m. An amount in terms of mass of cobalt in the covering film per one side of the plated steel sheet is within a range of 0.1 to 20 mg/m.

Aluminum-zinc plated steel sheet and method for producing the same

A surface-coated aluminum and zinc plated steel sheet in accordance with the present invention includes: a plated steel sheet; a composite coating film formed by applying an aqueous surface treatment agent on the plated steel sheet and drying the aqueous surface treatment agent. The aqueous surface treatment agent contains a water dispersible resin (A), a cobalt compound (B), and water, and has a pH within a range of 7.5 to 10. The composite coating film contains the water dispersible resin (A) and the cobalt compound (B). A percentage by mass of the water dispersible resin (A) in the composite coating film is 90% or more. A mass of the composite coating film per one surface of the plated steel sheet falls within a range of 0.5 to 3.5 g/m.

Surface-coated aluminum and zinc plated steel sheet and method of preparing same

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Osaka, Japan

Tomokazu Sugitani