Nippon Mining & Metals Co., Ltd.

Nippon Mining Co., Ltd.

Yasunori Yamamoto

Eiji Nishimura

Hiroshi Tasaki

A method for producing a brown coated article, wherein an iron substrate is dipped at a temperature of from 430.degree. to 600.degree. C. in a molten Zn plating bath containing from 0.05 to 1% by weight of Mn, so as to zinc hot-dip galvanize the same, a heat treatment is carried out to convert the Zn-Mn phase formed by the zinc hot-dip galvanizing to a Zn-Mn-Fe phase, and subsequently the zinc hot-dip galvanizing layer is brought into contact with an acidic aqueous solution containing an oxidizing agent.

Method for producing a color-coated article

A brown coated article which exhibits stable color is provided by the composition and structure of a zinc hot-dip galvanizing layer. The zinc hot-dip galvanizing layer consists essentially of from 1 to 15% by weight of Fe and from 0.05 to 1% by weight of Mn, and balance of Zn. A brown Zn-Mn-Fe oxide layer is present on the surface of the zinc hot-dip galvanizing layer.

Color-coated article and method for producing the same

There is provided a high-strength, easily-castable zinc alloy consisting substantially of, by weight, from 1 to 30 percent aluminum, from 1 to 20 percent copper, from 0.01 to 1 percent titanium, from 0.01 to 1 percent zirconium, and the balance zinc, and also is provided a high-strength, easily-castable zinc alloy further including from 0.01 to 0.1 percent magnesium. These alloys are useful in the manufacture of molds for injection molding of plastics or also useful as die casting products.

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Kanagawa, Japan

Yasunori Yamamoto