Coinage-used golden yellow copper alloy material and preparation method thereof

A copper alloy and golden yellow technology is applied in the fields of gold-yellow copper alloy materials for coinage, coinage blanks and various decorative materials, which can solve the problems of high raw material cost, increased difficulty in casting and high Al content, and achieves low raw material, Low manufacturing cost and good ingot quality

Active Publication Date: 2013-01-30
CHINA BANKNOTE PRINTING & MINTING +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 1096545A discloses a copper-bronze-based alloy material for imitation gold decoration and its manufacturing and processing technology, which consists of Al 3-9%, Sn 1-4%, In 0.1-1.60%, Ni 0.1-1.2%, Fe 0.01- 1, 0%, Cr 0.01-0.7%, rare earth 0.01-0.8% and copper composition, the raw material cost of this material is high, and the Al content is high, and the difficulty of melting and casting increases
[0006] The discoloration resistance of imitation gold alloy is a concept different from the corrosion resistance. To investigate its discoloration resistance, it is necessary to test it in salt spray, high humidity, H 2 S, SO 2 Assess its anti-tarnish performance in different environments, none of the above-mentioned patents has any description in this regard

Method used

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  • Coinage-used golden yellow copper alloy material and preparation method thereof
  • Coinage-used golden yellow copper alloy material and preparation method thereof
  • Coinage-used golden yellow copper alloy material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: The components are respectively: Cu: 76.0wt%, Al: 1.8wt%, Ni: 0.4wt%, B: 0.005wt%, Ce: 0.05wt%, Si: 0.1wt%, Fe: 0.06wt% , Pb: 0.01wt%, the balance is Zn 1# alloy and Cu: 75.0wt%, Al 2.0wt%, Ni: 0.5wt%, B: 0.003wt%, Ce: 0.08wt%, Si: 0.2wt% , Fe: 0.02wt%, Pb: 0.05wt%, and the 2# alloy whose balance is Zn is smelted and cast according to the above-mentioned preparation method step a to obtain the alloy ingot of the above two components, and then according to step b to obtain the surface-free The ingot with defects was directly cold-rolled, and the deformation amount of one cold-rolling was 60%. The macroscopic appearance of the rolled slab showed no cracks on the surface and edge of the two-component alloy, indicating that the above-mentioned alloy ingot Tissue cold working performance is good. The base cake processed from the two alloys in this example and the existing coinage HSn72-1-1 plate is polished and then tested for gold color with a color difference m...

Embodiment 2

[0037] Example 2: The components are respectively: Cu: 76.0wt%, Al: 1.8wt%, Ni: 0.8wt%, B: 0.005wt%, Ce: 0.003wt%, Si: 0.1wt%, Fe: 0.02wt% , Pb: 0.03wt%, the balance is Zn and unavoidable impurities 1# alloy and Cu: 75.0wt%, Al 2.4wt%, Ni: 0.2wt%, B: 0.01wt%, Ce: 0.1wt%, 2# alloy of Si: 0.2wt%, Fe: 0.01wt%, Pb: 0.01, and the balance is Zn, respectively, according to the above steps a-i to make plates with a thickness of 2mm. The above two kinds of plates and the existing coinage HSn72-1-1 plates are wire-cut into small rectangular pieces with a length of 50 mm and a width of 20 mm, and then processed according to the following process: cold rolling 40% → measuring Vickers hardness (HV) → cold Rolling 20% ​​→ measuring Vickers hardness (HV) → cold rolling 20% ​​→ measuring Vickers hardness (HV), until about 0.5mm.

[0038] Two kinds of alloys in this embodiment and the base cake processed from the HSn72-1-1 sheet material used for coinage in the present embodiment are processe...

Embodiment 3

[0043] Example 3: The components are respectively: Cu: 76.0wt%, Al: 1.9wt%, Ni: 0.3wt%, B: 0.007wt%, Ce: 0.02wt%, Si: 0.15wt%, Fe: 0.001wt% , Pb: 0.003wt%, the balance is Zn 1# alloy and Cu: 77.0wt%, Al 2.0wt%, Ni: 0.5wt%, B: 0.009wt%, Ce: 0.008wt%, Si: 0.18wt% %, Fe: 0.04wt%, Pb: 0.03wt%, and the balance is Zn 2# alloy, respectively according to the steps a-i in the above preparation method to make a plate with a thickness of 2mm. The above-mentioned two kinds of 1# alloy plate and 2# alloy plate, and the existing HSn72-1-1 plate for coinage are processed into blank cakes, and after polishing, the color difference measuring instrument (model: 6801) produced by Germany BYK-GARDNER GMBH company is used. Carry out gold degree test, obtain three kinds of alloy gold degree test comparison data, test result is shown in Table 3.

[0044] table 3:

[0045]

[0046] It can be seen from Table 3 that the color difference dE between HSn72-1-1 alloy and gold * =25.65, while the colo...

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Abstract

The present invention discloses a yellow copper alloy, and particularly relates to a coinage-used golden yellow copper alloy material having high resistance to discoloration and good cold processability. The material is mainly applied to coinage billets and various decorative materials. The coinage-used golden yellow copper alloy material is composed of the following components by weight: 75.0-77.0 wt% of Cu, 1.8-2.4 wt% of Al, 0.2-0.8 wt% of Ni, 0.003-0.01 wt% of B, 0.10-0.20 wt% of Si, no more than 0.1 wt% of Ce, no more than 0.06 wt% of Fe, no more than 0.05 wt% of Pb, and the balance being Zn. Compared with the conventional coinage material of HSn 72-1-1 alloy, the alloy produced by the invention has higher golden color and excellent discoloration resistance under the condition of high humidity, artificial sweat, salt spray, SO2, H2S and other hot and humid environments. At the same time, the alloy is excellent in cold processing performance, the cold processing amount per pass is up to 60%, the processing hardening rate and rigidity both satisfy the requirements of coinage technology, and the alloy has the characteristics of golden color and low cost of raw materials and manufacturing.

Description

technical field [0001] The invention relates to a yellow copper alloy, in particular to a golden yellow copper alloy material for coinage with high resistance to discoloration and good cold working performance, and is mainly used for coinage blanks and various decorative materials. Background technique [0002] In recent years, 24K gold, with its magnificence and magnificence, is gradually replacing the status of chrome-plated bright silver, which has been popular for decades, and has become an international fashionable color. Gold has a beautiful golden yellow color, good chemical stability, does not change color when heated, and has excellent oxidation resistance. Therefore, gold has been used to make jewelry all the time, and is very popular among people. The modern consumer consciousness attaches great importance to novel styles and refurbished designs and colors. The concept of value preservation of gold jewelry is gradually replaced by cheap, beautiful and various imit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04C22F1/08
Inventor 梁军陈景林刘志刚赖茂明张晓男康今哲刘强刘爽范学良仉喜祥
Owner CHINA BANKNOTE PRINTING & MINTING
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