JPS60177143A - Golden copper alloy for ornamentation - Google Patents

Abstract

PURPOSE:To obtain a golden Cu alloy for ornamentation having superior corrosion resistance, workability and mechanical properties by adding specified amounts of Al, Sn and a noble metal to Cu. CONSTITUTION:A golden Cu alloy for ornamentation having superior corrosion resistance, workability and mechanical properties is obtd. by adding 2-10wt% Al, 0.1-8wt% Sn and 0.01-1.8wt% noble metal such as Au, Ag, Pt, Pd, Rh, Ru, Ir or Os to Cu.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a golden copper alloy used as a substitute for decorative gold alloys.

With the recent efforts to save resources, golden alloy materials are required as a substitute for decorative gold alloys.

Generally speaking, one of the requirements for decorative items is to have good corrosion resistance and mechanical properties.

Furthermore, since these ornaments are subjected to complex processing for decorative purposes, they are also required to be easy to process and to have a color close to golden yellow.

By the way, as an alloy used as a decorative golden-colored material, there is a brass alloy consisting of 30ht% Zn and the balance Cu, but this alloy has poor corrosion resistance and poor mechanical properties.
The drawback was that it was difficult to process into complex shapes.

The present invention was made in order to eliminate the above-mentioned drawbacks, and is a copper-based alloy that has excellent corrosion resistance, workability, mechanical properties,
It is an object of the present invention to provide a decorative golden copper alloy having a golden color.

The decorative golden copper alloy according to the present invention is A12~10wt.
%, S n O, 1-8 wt%, noble metal 0.01-1
．． It is an alloy consisting of 8snt% and the balance Cu.

The reason for adding At in the decorative golden copper alloy according to the present invention is A! This is because when alloyed with Cu, a stable oxide film is created on the surface, improving corrosion resistance and producing a golden-colored alloy.If it is less than 2wt%, the effect is weak, and if it exceeds 10wt%, it will become a metal. This is because interlayer compounds are formed, making it difficult to process into thin plates.

In addition, the reason for adding Sn is that when Sn is alloyed with Cu, it forms a stable oxide film on the surface, improving corrosion resistance, and the Cu-3n alloy forms a metal Jul compound, improving mechanical properties. This is because if the content is less than 0.1 wt%, the effect is low, but if it exceeds 8 wt%, the workability is significantly reduced.

In addition, the reason for adding noble metals is to further improve the corrosion resistance of the Cu-Al alloy by adding a small amount of noble metals, and if the amount is less than 0.01 wt%, the effect will be weak.
This is because even if the content exceeds wt%, no significant change is observed. The precious metal referred to here is Au.

This includes Ag, Pt+'Pd, Rh, Ru, Ir, and Os.

Examples and conventional examples will be described below in order to clarify the effects of the decorative golden copper alloy according to the present invention.

Tests on color, workability, sweat resistance 9 mechanical properties of decorative golden copper alloys of Examples 1 to 4 and conventional examples 1.2 and 1.2 having the composition shown in Table 1 As a result, the results shown in Table 2 were obtained.

Table 1 Table 2 In addition, the artificial sweat test is NH2O115.5g/β.

NaCl20g/L acetic acid 2.5g/ji! Judgment was made after immersion for 240 hours at a liquid temperature of 40°C with a liquid composition of , urea 5g/4° lactic acid 15g/Il, pH 4.7.

Further, the tensile test was conducted at room temperature after 30% processing.

As is clear from the above, the decorative golden-colored copper alloy according to the present invention has excellent sweat resistance, workability, mechanical properties, and golden color compared to conventional decorative golden-colored copper alloys. I know that there is.

As detailed above, the decorative golden copper alloy of the present invention is
It has excellent sweat resistance and processability (5) and has a golden color, so it can be said to be an epoch-making product that can replace conventional decorative golden copper alloys.

Applicant Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] 2 to 10 wt% aluminum, 0.1 to 8 wt% tin. A decorative golden-colored copper alloy consisting of 0.01 to 1.8 wt% of precious metals and the balance copper.