JPH07292427A - Corrosion resisting copper alloy sheet with high strength - Google Patents

Abstract

PURPOSE:To provide high strength and superior corrosion resistance by specifying the contents of Zn, Ni, Mn, and P in a Cu alloy sheet. CONSTITUTION:An alloy, having a composition consisting of, by weight, 35.5-40% Zn, 7-15% Ni, 0.5-2% Mn, 0.001-0.015% P, and the balance Cu with inevitable impurities, is used. A Cu alloy of this composition is cast, hot-rolled, cold-rolled, intermediate-rolled, and finish-rolled, by which the Cu alloy sheet combining high strength with corrosion resistance can be obtained. Zn in the alloy composition improves strength and Ni improves corrosion resistance. Mn improves strength to a greater extent by its coexistence with Zn. P acts as a potent deoxidizer and reduces oxygen content in the sheet. This Cu alloy sheet can reduce the thickness of various structural members and can contribute to the miniaturization and weight reduction of various kinds of machinery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Cu alloy sheet material having high strength and excellent corrosion resistance.

[0002]

2. Description of the Related Art Conventionally, for example, various Cu alloy plate materials have been used for manufacturing structural members of electric and electronic equipment such as cap materials for crystal oscillators, spring materials for terminals and connectors, and various decorative members and key materials. It is well known that (including strips) is used.

[0003]

On the other hand, in recent years, miniaturization and weight reduction of the above-mentioned electric and electronic devices and other mechanical devices have been remarkable, and accordingly, thinning of these structural members is strongly required. In addition, the usage environment is diversified,
Since there is a tendency to be forced to use in a severe corrosive environment, therefore, the Cu alloy sheet used for manufacturing these is required to have high strength for thinning and good corrosion resistance. Among the plate materials, those having high strength are inferior in corrosion resistance, and those having good corrosion resistance are inadequate in strength at present.

[0004]

Therefore, the present inventors have
From the above viewpoint, as a result of research to develop a Cu alloy sheet material having strength and corrosion resistance, as a result, Zn: 35.5 to 40%, N: 35.5 to 40% by weight% (hereinafter,% indicates weight%)
i: 7 to 15%, Mn: 0.5 to 2%, P: 0.
It was obtained that the Cu alloy sheet material containing 001 to 0.015% and the balance of Cu and unavoidable impurities has both high strength and good corrosion resistance.

The present invention was made on the basis of the above research results, and the reason why the composition of the Cu alloy sheet material is limited as described above will be explained below. (A) Zn The Zn component has an effect of improving strength, but if the content is less than 35.5%, desired high strength cannot be secured, while if the content exceeds 40%. Since the cold rolling property is deteriorated, its content is 35.
It was set at 5 to 40%. Incidentally, the content of 36 to 39% is desirable.

(B) Ni The Ni component has a function of improving the corrosion resistance, but if the content thereof is less than 7%, the desired excellent corrosion resistance cannot be secured, while the content thereof is 15%. If it exceeds, the hot rolling property will be deteriorated, so the content was set to 7 to 15%. It should be noted that the content is preferably 8 to 14%.

(C) Mn The Mn component has the effect of further improving the strength in the coexistence with Zn and also improving the corrosion resistance, but if its content is less than 0.5%, the desired strength improving effect is obtained. On the other hand, if the content exceeds 2%, the castability and hot rollability will deteriorate, so the content was defined as 0.5-2%. In addition, desirably 1 to 1.8%
Is included.

(D) The P P component acts as a strong deoxidizing agent to reduce the oxygen content in the plate material, so that Zn and Mn can sufficiently improve the strength and Ni can effectively improve the corrosion resistance. But the content is 0.001
If it is less than 0.1%, deoxidation becomes insufficient, and desired excellent strength and corrosion resistance cannot be secured, while if its content exceeds 0.015%, hot rolling property deteriorates. , Its content is 0.001-0.015%
I decided. It should be noted that the content of 0.002 to 0.01% is desirable.

[0009]

EXAMPLES Next, the Cu alloy sheet material of the present invention will be specifically described by way of examples. A Cu alloy melt having the composition shown in Table 1 was prepared in a normal medium frequency coreless melting furnace, and the thickness was 150 mm and the width was 450 by the semi-continuous casting method.
mm × length: cast into an ingot having dimensions of 2400 mm, and a hot rolling start temperature: a predetermined temperature within a range of 800 to 900 ° C., a hot rolling end temperature: 400 ° C. or more in the ingot It is necessary to cold-roll under normal conditions, after hot-rolling it into a hot-rolled sheet with a thickness of 11 mm, cooling it with water and then chamfering the upper and lower surfaces by 0.5 mm each. According to the above, an intermediate annealing is applied, and finally after annealing, finish rolling is performed at a rolling ratio of 10% to obtain a Cu alloy sheet 1 to 9 of the present invention and a comparative Cu alloy sheet 1 to 2.8 mm in thickness. 4 were each manufactured.

For the comparative Cu alloy sheet materials 1 to 4, the content of any one of the constituent components (marked with * in Table 1)
Have a composition outside the scope of the present invention. Regarding the various Cu alloy plate materials obtained as a result,
A tensile test and a corrosion test were performed to evaluate strength and corrosion resistance. The corrosion test is performed as a corrosion acceleration test, and as specified in JIS L0848D method, disodium phosphate (8 g), sodium chloride (8 g) and acetic acid (5 g) are dissolved in distilled water (11) to adjust the pH to about. 4.5
Cu with the gauze soaked with this corrosive liquid
The alloy plate test piece was wrapped, sealed in a vinyl bag, kept at a temperature of 50 ° C., and the time until rust was generated on the test piece was measured. The results of these tests are shown in Table 1.
It was shown to.

[0011]

[Table 1]

[0012]

From the results shown in Table 1, it is clear that each of the Cu alloy sheet materials 1 to 9 of the present invention has high strength and excellent corrosion resistance, while the comparative Cu alloy sheet materials 1 to 4 are used.
As can be seen from the above, even if the content of any one of the constituent components deviates from the scope of the present invention to the lower side, it is clear that at least one of the properties of strength and corrosion resistance becomes inferior. . As described above, since the Cu alloy sheet material of the present invention has high strength and excellent corrosion resistance, it enables thinning of various structural members manufactured by using the Cu alloy sheet material, which reduces the size of various mechanical devices and It not only contributes to weight reduction, but also has industrially useful properties such as a further extension of service life even under severe operating environments.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuyoshi Narita 128-7 Ogimachi, Aizuwakamatsu, Fukushima Prefecture Wakamatsu Works, Mitsubishi Shindoh Co., Ltd.

Claims (1)

[Claims] 1. By weight%, Zn: 35.5-40%, Ni: 7-15%, Mn: 0.5-2%, P: 0.001-0.01
Corrosion resistant Cu having high strength, characterized in that it has a composition containing 5% and the balance of Cu and unavoidable impurities.
Alloy plate material.