JPS60177142A - 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, 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 2-10wt% Al, 0.1-7wt% Mn 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.

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.
G) It had the disadvantage that it was difficult to process into complex shapes.

The present invention was made in order to eliminate the above-mentioned drawbacks, and it 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 such a golden color.

The decorative golden copper alloy according to the present invention is A12~10wt.
%, MnO, 1-7 wt%, noble metal 0.01-
It is an alloy consisting of 1.8 wt% and the balance Cu.

In the decorative golden copper alloy according to the present invention, 1. The reason for adding AI is that when alloyed with Cu, AI forms a stable oxide film on the surface, improves corrosion resistance, and produces a golden yellow color. This is because an alloy can be obtained, and if it is less than 2wt%, the effect is weak, and if it exceeds 10wt%, it will create an intermetallic compound,
This is because 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 0.11%, the effect will be weak, and if it exceeds 7wt%, the workability will be significantly reduced.

In addition, the reason for adding precious metals is to further improve the corrosion resistance of the Cu-Al alloy by adding a small amount of precious metals, and if the amount is less than 0.01 ivt%, 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.

(Margin below) Table 1 Table 2 Nao, the artificial sweat test was NH2Ot 15.5g/j! .

NaCl 20g/C acetic acid 2.5g/A, urea 5
g/12.

Milk M15g/CP'H4,7 (7) liquid composition, liquid temperature 40℃
, after 240 hours of immersion.

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

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

As detailed above, the decorative golden copper alloy of the present invention is
Since it has excellent sweat resistance and workability (9) 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] Aluminum 2-10 int%, manganese 0.1-7%
A decorative golden copper alloy consisting of 1t%, precious metals 0.01 to 1.8wt%, and the balance copper.