JPS60177157A - 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 Zn, Mn 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 7-45wt% Zn, 0.1-7wt% Mn and 0.01-2wt% 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.

In general, 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 30 wt% 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 provides a decorative golden-colored copper alloy that is a copper-based alloy and has excellent corrosion resistance, workability, and mechanical properties, and has a golden color. That is.

The decorative golden copper alloy according to the present invention is Zn7~45-1
%, Mn 0.1-7wt%, noble metal 0.01-2
wt%.

This is an alloy with the remainder being Cu.

The reason why Zn is added to the decorative golden copper alloy according to the present invention is that Zn produces a golden color when alloyed with Cu, and if it is less than 7 wt%, the effect is weak. , 451%, β phase appears and it becomes difficult to process into a thin plate.

In addition, the reason for adding Mn is that Mn improves corrosion resistance by alloying with Cu, and also improves tensile strength, hardness,
This is to increase the elongation, and if it is less than 0.1 wt%, the effect will be weak, and if it exceeds 7 wt%, the workability will be significantly reduced.

In addition, the reason for adding precious metals is to further improve the corrosion resistance of the Cu-Zn-Mn alloy by adding a small amount of precious metals, and if it is less than 0.01wt%, the effect is weak,
This is because even if it exceeds t%, no significant change is observed. The precious metals mentioned here are Au, Ag, l) L, P
This includes d, 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 the color, workability, sweat resistance, and mechanical properties of the decorative golden-colored copper alloys of Examples 1 to 4 and the decorative golden-colored copper alloys of Conventional Examples 1 and 2 having the composition shown in Table 1. As a result, the results shown in Table 2 were obtained.

(Margins below) Table 1 Table 2 The artificial sweat test was performed using NH2Ol 15.5. g/j2゜N a C120g/I! ,, ffi: acid 2.5g
/j! , Urine ff15 g/12゜Lactic acid 15 g/L P
Judgment was made after immersion for 240 hours at a liquid temperature of 40° C. with a liquid composition of H4.7.

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 has a 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
Because it has excellent sweat resistance and workability, and has a golden color, 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] A decorative golden copper alloy consisting of 7 to 45 wt% zinc, 0.1 to 7 wt% manganese, 0.01 to 2 wL% of noble metals, and the balance copper.