Tarnish-resistant gold imitation copper alloy material and preparation method thereof

Abstract

The invention relates to a tarnish-resistant gold imitation copper alloy material, which comprises the following ingredients including 79 to 83 weight percent of Cu, 1.5 to 2.5 weight percent of Al, 0.5 to 1.0 weight percent of Ni, 0.3 to 1.0 weight percent of Sn, 0.2 to 0.5 weight percent of Fe, 0.01 to 0.05 weight percent of Ce and the balance of Zn and unavoidable impurities. The color and luster is golden yellow; the color and luster requires the brightness value L to be greater than or equal to 80, the red-green value a to be 1 to 4 and the blue-yellow value b to be 19 to 26. Compared with copper alloy such as the existing alloy HSn72-1-1, the produced alloy produced by the invention has the advantages that the tarnish-resistant performance and the corrosion-resistant performance are more excellent; the alloy ingredients are reasonable; the production process is simple; the alloy performance is excellent; the alloy can be applicable to the fields of various building decoration materials, commemorative coins, energy engineering, ocean engineering and the like.

Description

technical field [0001] The invention relates to a copper alloy, in particular to a multi-element copper alloy material with imitation gold appearance, corrosion resistance and discoloration resistance, which is mainly used in coinage blanks, various decorative materials, energy engineering, marine engineering and other fields. Background technique [0002] In recent years, as people have higher and higher requirements on the corrosion resistance of copper alloys, copper alloys are also required to have a beautiful and pleasing appearance and resist discoloration. The anti-tarnish imitation gold copper alloy has excellent golden color, anti-tarnish and corrosion resistance, and is a very valuable copper alloy material. The alloy products can be involved in circulation currency, commemorative coins, architectural decoration, tourist souvenirs, arts and crafts products, etc.; at the same time, the alloy product has good corrosion resistance and anti-marine biological pollution ...

AI Technical Summary

Problems solved by technology

[0003] CN102899526B patent discloses a golden yellow copper alloy material for coinage. The alloy is exposed to high humidity, artificial sweat, salt spray, SO 2 and H 2 S and other hot and humid environments show good anti-tarnish performance, its composition is: Cu: 75.0-77.0wt%, Al: 1.8-2.4wt%, Ni: 0.2-0.8wt%, B: 0.003-0.01wt%, Si: 0.10~0.20wt%, Ce: ≤0.1wt%, Fe: ≤0.06wt%, Pb: ≤0.05wt%, the balance is Zn, but the alloy has insufficient corrosion resistance in seawater

[0004] None of the above materials meet the performance requirements of gold imitation, discoloration resistance, and corrosion resistance. At the same time, the above materials are not milled on four sides after hot rolling, and their product quality and final yield are low in industrial production.

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