JPS60177154A - 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, Si and a noble metal to Cu. CONSTITUTION:A golden Cu alloy for ornamentation having superior corrosion resistance, workability and mechanical properties such as fatigue resistance is obtd. by adding 7-45wt% Zn, 0.1-7wt% Si 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 3Qwt% Z n 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 (fatigue resistance), and has a golden color. The purpose is to provide alloys.

The decorative golden copper alloy according to the present invention is Zn7~45iv
t%, S i O, 1-7 wt%, 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-colored copper alloy according to the present invention is that Zn produces a golden color when alloyed with CLJ, and if it is less than 7 wt%, the effect is weak. This is because if it exceeds 45 ivt%, β phase will appear and it will be difficult to process it into a thin plate.

Furthermore, the reason for adding Si is that by alloying with Cu, St refines the crystal grains and improves the fatigue resistance against repeated deformation. This is because if it exceeds this, phases will precipitate and workability will deteriorate.

In addition, the reason for adding precious metals is to further improve the corrosion resistance of the Cu-Zn-5t 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, Pt, p
This includes d, Rh, Ru, l r, and Os.

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

Tests on the color, workability, sweat resistance, and fatigue resistance of the decorative golden-colored copper alloys of Examples 1 to 4 and the decorative golden-colored steel alloys of Conventional Examples 1 and 2 having the compositions shown in Table 1. Then the second
The results shown in the table were obtained.

Table 1 Table 2 Nao, artificial sweat test is N H4Cl 15.51T /
ji.

NaCl20g/C vinegarill 2.5g/I! ,
Urine $5 g/it.

Lactic acid 15g/β, liquid composition I)8 4.7, liquid temperature 40℃
, soaked for 240 hours? Judgment was made after 13 days.

The fatigue test was performed using a Charpy tester, and the impact energy of 15 kg-am was repeatedly applied to the No. 4 test piece, and the test piece was evaluated by the number of times it took to break.

As is clear from the above, the decorative golden-colored copper alloy according to the present invention has excellent sweat resistance, workability, mechanical properties (fatigue resistance), and is superior to conventional decorative golden-colored copper alloys. It can be seen that it has a color.

As detailed above, the decorative golden copper alloy of the present invention is
It has excellent sweat resistance, processability, mechanical properties (-(fatigue resistance)), 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] A decorative golden copper alloy consisting of 7-45t% zinc, 0.1-7wt% silicon, 01-2wt% silicon, and the balance copper.