JP2001026830A - High corrosion resistant aluminum alloy conducting wire, and high corrosion resistant composite conducting wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high corrosion resistant conductor single wire usable without any particular corrosion protecting treatment in a atmospheric environment where moisture which contains corrosive matter such as chlorine ion is present. SOLUTION: The high corrosion resistant aluminum alloy conducting wire is composed of an aluminum alloy 12 which has a composition consisting of 0.3 to 4.3 wt.% Mn and the balance Al with inevitable impurities and in which an Al-Mn intermetallic compound is dispersedly precipitated. The desired conductor single wire can be obtained by using, as a coating material for a wire 11 or a composite wire, the above aluminum alloy 12 or an aluminum alloy which has a composition consisting of, by weight, 0.3 to 4.3% Mn, 0.05 to 6.0% Mg, and the balance Al with inevitable impurities and in which an Al-Mn intermetallic compound is dispersedly precipitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly corrosion-resistant aluminum alloy wire and a composite wire for use as a conductor element of a transmission line or a railway feeder line constructed between steel towers.

[0002]

2. Description of the Related Art Overhead transmission lines and railway feeder lines installed between steel towers are required to be lightweight in order to reduce the construction costs of the steel towers and other facilities. Therefore,
Aluminum or aluminum alloy wires that are lightweight and have relatively high conductivity among conductors are used as conductors for overhead transmission lines and railway feeders.

[0003] By the way, such overhead power lines and electric wires for electric trains are exposed to natural environments such as sunlight, wind and rain, and snow, and are required to have excellent environmental resistance.
Aluminum or aluminum alloy wire is used without any anticorrosion treatment because it has relatively good corrosion resistance in such a normal natural environment.

[0004]

However, such an aluminum or aluminum alloy wire having excellent corrosion resistance is also used in a region close to the ocean because a large amount of steam containing salt in the seawater is present in the atmosphere. There is a problem that corrosion progresses due to ions and the like, and the life of the electric wire is significantly reduced. Furthermore, in areas other than those near the ocean, in recent years, corrosion of aluminum and aluminum alloy wires has progressed due to rainwater in which air pollutants such as sulfur oxides and nitrogen oxides, which are substances that cause acid rain, are dissolved. However, there is a problem that corrosion is further promoted due to heat generation or the like due to a decrease in conductivity, thereby causing disconnection.

Therefore, anticorrosion measures such as applying grease to the metal surface have been taken for overhead transmission lines and the like used in areas exposed to such severe corrosive environments. Grease has a problem that it deteriorates in the atmospheric environment. That is, since the grease is composed of a polymer compound, there is a problem that the grease is degraded by ultraviolet rays or heat by sunlight, cracks or the like, peels off, and loses corrosion resistance. For this reason, anticorrosion overhead transmission lines that have been subjected to anticorrosion treatment using grease are regularly monitored according to the environment in which they are laid,
It is necessary to perform maintenance inspections such as replenishing grease, but even if such maintenance inspections are performed, corrosive aqueous solution penetrates through cracked gaps as described above, and rapid In some cases, corrosion may progress, so that it is difficult to perform complete maintenance. Further, there is a problem that the connection work becomes troublesome when replacing the wire using such grease.

[0006] The present invention has been made in view of the above problems, and dissolves corrosive substances such as sulfur oxides and nitrogen oxides which cause chlorine-containing water and acid rain in marine areas. To provide a highly corrosion-resistant aluminum alloy wire for conductive use and a composite aluminum alloy wire having excellent corrosion resistance and conductivity that does not need to be subjected to anticorrosion treatment with grease when exposed to corrosive environments such as rainwater. Aim.

[0007]

The inventors of the present invention have conducted intensive experiments and researches to solve the above-mentioned problems.
By using an aluminum alloy on which a Mn-based intermetallic compound is precipitated as a wire or a coating, a highly corrosive environment in which high conductivity and moisture containing chlorine ions that require the above-described anticorrosion treatment are present. In, found that a conductor strand having extremely excellent corrosion resistance can be obtained,
The present invention has been reached.

That is, the aluminum alloy wire according to claim 1 of the present invention contains 0.3 to 4.3% by weight of Mn, the balance has Al and inevitable impurities, and Al- It is characterized by comprising an aluminum alloy in which a Mn-based intermetallic compound is dispersed and precipitated.

The conductive high corrosion-resistant aluminum alloy wire according to claim 2 is characterized in that Mn contains 0.3 to 4.3% by weight, and Mg contains 0.04% by weight.
An aluminum alloy containing 5 to 6.0% by weight, the balance being Al and unavoidable impurities, and comprising an Al-Mn intermetallic compound dispersed and precipitated. It is.

Further, the high corrosion resistant composite wire for electric conduction according to claim 3 is:
A core material of aluminum for conductive use or aluminum alloy for conductive use contains the alloy according to claim 1, that is, 0.3 to 4.3% by weight of Mn, the balance being Al and unavoidable impurities, and An alloy in which an Al-Mn intermetallic compound is dispersed and precipitated is coated.

In a fourth aspect of the present invention, there is provided a high corrosion resistant composite wire for conductive use, wherein the core material of conductive aluminum or a conductive aluminum alloy contains 0.3 to 4.3% by weight of the alloy according to claim 2, that is, Mn. From 0.05 to 6.0% by weight, with the balance being Al
And unavoidable impurities, and Al-
It is characterized by being coated with an aluminum alloy in which a Mn-based intermetallic compound is dispersed and precipitated.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention uses a heat treatment of an aluminum alloy containing a specific amount of Mn to disperse and precipitate an Al-Mn intermetallic compound as a coating material for a wire or a composite wire. The present invention is to obtain a conductor having high conductivity of 50% IACS or more and excellent corrosion resistance in an environment where water containing chlorine ions and the like having high corrosivity exists.

In the above aluminum alloy, Al-
If the Mn-based intermetallic compound is not sufficiently dispersed and dispersed, that is, if the concentration of Mn dissolved in aluminum is high, it is impossible to obtain a material having both excellent corrosion resistance and conductivity. Further, it is preferable that the precipitated Al-Mn intermetallic compound is in a fine and uniform state. For such a purpose, it is effective to add a predetermined amount of Mg. Furthermore, by using aluminum or an aluminum alloy for conductivity as a core material and forming a composite wire coated with the aluminum alloy in which an Al-Mn intermetallic compound is dispersed and deposited, the conductivity, corrosion resistance, and tensile strength are improved. A conductor having more excellent properties such as strength and heat resistance can be obtained.

In this case, the coverage of the coating layer can be appropriately selected and used according to the intended use. Usually, when high conductivity is required, the coverage is 15 to 60% by volume. A range is preferred. 60Vol coverage
%, It is difficult to obtain a high conductivity, and the effect of improving properties such as heat resistance cannot be obtained. If it is less than 15 Vol%, the core material is exposed at the time of wire drawing. As a result, the desired corrosion resistance may not be obtained.

Here, the reasons for limiting the composition of the alloy used for the conductive high corrosion-resistant aluminum alloy wire and the composite wire of the present invention will be described. Mn: Mn is an important alloy component for imparting corrosion resistance in the present invention, and precipitates as an Al-Mn intermetallic compound depending on the amount of Mn.
If the added amount of Mn is more than 4.3% by weight, a coarse Mn compound is formed at the time of casting, and the subsequent processing becomes difficult, and the conductivity and the corrosion resistance are undesirably reduced. When the added amount of Mn is less than 0.3% by weight, Al-
Insufficient amount of Mn-based intermetallic compound precipitates and disperse state are caused, and sufficient corrosion resistance cannot be obtained, which is not preferable.

The main Al-Mn intermetallic compound precipitated here is Al ₆ Mn, Al ₁₂ Mn, or the like.

Mg; Mg is not an essential element in the present invention, but promotes the precipitation of an Al—Mn intermetallic compound. Therefore, when the addition amount of Mn is relatively small, the above-mentioned precipitation state is obtained. To contribute. However, if the added amount of Mg is less than 0.05% by weight, such an effect cannot be sufficiently obtained, and if it exceeds 6.0% by weight, the conductivity, castability and workability are reduced. As 0.05 ~
Preferably, it is 6.0% by weight.

In addition to the above, it is preferable to add 0.003 to 0.2% by weight of Ti in order to refine the cast crystal structure. If the amount is less than 0.003% by weight, the intended effect cannot be obtained, and if it exceeds 0.2% by weight, a Ti-Al-based coarse intermetallic compound is generated. When Ti and B or Ti and C are added in combination, the refinement of the crystal is further promoted. When compounding Ti and B, Ti should be 0.003 ~
It is preferable to add 0.1 wt% and B at 0.0001 to 0.05 wt%. On the other hand, when Ti and C are added in combination, Ti is 0.003-0.1% by weight, and C is 0.0001-0.1%.
It is preferable to add 0.05% by weight.

To further improve the strength, Cr, V, Zr
Is desirably added in the range of 0.03 to 0.15% by weight, respectively. In order to prevent oxidation of the molten metal during casting, Be is added in an amount of 0.01% by weight.
It is desirable to contain less than.

Further, in the alloy used as a wire or coating material of the highly corrosion-resistant aluminum alloy wire for electric conduction and the composite wire of the present invention, the content of Fe is 0.2% by weight or less and the content of Si is 0.1% by weight or less.
The effect of the present invention is not substantially changed even if the impurity element is contained in the range of 4% by weight or less and Zn in the range of 0.3% by weight or less.

The alloy wire and the composite wire of the present invention are shown in FIG.
(B) As shown in (a), an alloy wire formed entirely of a highly corrosion-resistant aluminum alloy for conduction 12 according to the present invention, and FIG.
As shown in FIG. 2, a composite wire in which a normal aluminum or aluminum alloy wire 11 is coated with a highly corrosion-resistant aluminum alloy 12 for conductivity according to the present invention. In the above drawings, the round wire is shown, but the cross-sectional shape can be arbitrarily selected from a rectangular wire, a tape shape, a pipe type and other irregular shapes other than the round wire.

[0022]

Next, a high corrosion-resistant aluminum alloy wire and a composite wire for power transmission according to the present invention will be specifically described in comparison with comparative examples.

Example 1 Mn: 0.3% by weight, Fe: 0.1% by weight, Si: 0.
05% by weight, Zn: 0.05% by weight, Cu: 0.02% by weight, Ti: 0.02% by weight, Cr: 0.03% by weight,
V: 0.02% by weight, Zr: 0.02% by weight, balance Al
9.5mmφ in a hot press
Was obtained. Then, at 400 ° C in a reducing atmosphere,
After heat treatment for 2 hours, the wire was drawn by a continuous wire drawing machine to precipitate an Al-Mn intermetallic compound of 3.2 m.
An mφ aluminum alloy wire was obtained.

Example 2 An Al-Mn intermetallic compound was precipitated in the same manner as in Example 1 except that an aluminum alloy wire having the same composition as in Example 1 was used except that Mn was changed to 1.6% by weight. 3.2mm
A φ aluminum alloy wire was obtained.

Example 3 An Al—Mn intermetallic compound was precipitated in the same manner as in Example 1 except that an aluminum alloy wire having the same composition as in Example 1 was used except that Mn was 4.3% by weight. 3.2mm
A φ aluminum alloy wire was obtained.

Comparative Example 1 An Al-Mn intermetallic compound was precipitated in the same manner as in Example 1 except that an aluminum alloy wire having the same composition as in Example 1 was used except that Mn was 0.1% by weight. 3.2mm
A φ aluminum alloy wire was obtained.

Comparative Example 2 An Al—Mn intermetallic compound was deposited in the same manner as in Example 1 except that an aluminum alloy wire having the same composition as in Example 1 was used except that Mn was 4.8% by weight. 3.2mm
A φ aluminum alloy wire was obtained.

Example 4 A 9.5 mmφ rough wire having the same composition as in Example 1 was prepared except that 0.5% by weight of Mg was added, and then drawn and heat-treated in the same manner as in Example 1. And Al-M
A 3.2 mmφ aluminum alloy wire on which an n-type intermetallic compound was precipitated was obtained.

Example 5 An ingot having the same composition as in Example 2 was heat-treated in a reducing atmosphere at 400 ° C. for 10 hours, and then hot-rolled and cold-rolled to precipitate an Al-Mn intermetallic compound. 2.8m thick
m of aluminum alloy tape was obtained. Next, this tape is longitudinally attached to a 9.5 mmφ conductive aluminum core material, and the edges are welded while being formed into a tubular shape, and a composite wire coated with an aluminum alloy on which an Al-Mn intermetallic compound is dispersed and deposited. I got Thereafter, the composite wire was drawn by a continuous wire drawing machine to obtain a 3.2 mmφ composite wire in which the aluminum alloy coating material and the core material were completely integrated.

Example 6 An ingot having the same composition as in Example 2 was hot- and cold-rolled to produce a tape having a thickness of 0.9 mm. A composite wire of 0.2 mmφ was obtained.

Example 7 An ingot having the same composition as in Example 2 was hot- and cold-rolled to produce a tape having a thickness of 0.4 mm. A composite wire of 0.2 mmφ was obtained.

Conventional Example 1 A hard aluminum wire having a diameter of 3.2 mm was produced from an aluminum ingot for electric use specified in JIS H 2110.

Conventional Example 2 Si and Mg are added to an aluminum aluminum bar specified in JIS H 2110, and 3.2 mmφ is specified in JEC-3405, a standard of the Institute of Electrical Engineers of Japan.
No. 1 aluminum alloy wire was manufactured.

Conventional example 3 A heat-resistant aluminum alloy wire of 3.2 mmφ defined by the Institute of Electrical Engineers of Japan and JEC-3406 standardized by the Institute of Electrical Engineers of Japan is prepared by adding Zr or the like to an aluminum aluminum ingot specified by JIS H 2110. did.

Next, the electrical conductivity and tensile strength of the thus obtained wires of Examples, Comparative Examples and Conventional Examples were measured, and corrosion resistance was evaluated by performing the following corrosion tests. (1) Corrosion test Each wire cut to a length of 100 mm was 2N-HC
1H aqueous solution and 2N-HNO3 aqueous solution for 100 hours, and the corrosion loss after the test was measured. Next, the corrosion amount (mg) per unit surface area (cm ² ) of the wire was calculated from the corrosion loss. Table 1 summarizes the test results.

[0036]

[Table 1]

As shown in Table 1, Example 1 of the present invention
No. 7 to No. 7 all have a high electrical conductivity of 50% IACS or more, and the corrosion rate in an aqueous solution containing a highly corrosive chlorine ion in the corrosion resistance is the current conductivity. It has excellent corrosion resistance of several tenths compared to the aluminum wires and alloy wires of Conventional Examples 1 to 3 which are used, and also about 1/2 which is resistant to oxidizing acids such as nitrate ions. ing. Further, as shown in Examples 5 to 7, in the case where a composite wire is formed by using highly conductive aluminum for the core material, the conductive material required most often in the current aluminum-based conductor material is used. A conductor having a high conductivity of 55% IACS or more can be obtained.

On the other hand, in the alloy wires of Comparative Examples 1 and 2 deviating from the alloy composition of the present invention, Comparative Example 1 having a high Mn content was used.
Shows that the conductivity and the corrosion resistance in an aqueous solution containing chloride ions are rapidly reduced. In Comparative Example 2 where the content of Mn is low, the conductivity shows good characteristics, but the corrosion resistance in an aqueous solution containing chloride ions sharply decreases as in Comparative Example 1.

[0039]

As described in detail above, the conductive high corrosion-resistant aluminum alloy wire and the composite wire according to the present invention are obtained by heat-treating an alloy containing a predetermined Mn to disperse and deposit an Al-Mn intermetallic compound. Because it is an alloy wire made of a dispersed alloy or a composite wire obtained by coating such an alloy with various conductive aluminum and aluminum alloy wires, in a highly corrosive environment where water containing chlorine ions and the like is present, A conductor strand having extremely excellent corrosion resistance and a high conductivity of 50% IACS or more can be obtained.

In the present invention, a conductor material having excellent conductivity, strength, heat resistance and the like is used as the core material of the composite wire, and the above-mentioned alloy is used as the coating material. Since it is possible to obtain conductor wires having characteristics such as high strength and high heat resistance, the conductor wires of the present invention can be used for various purposes such as transmission lines exposed to highly corrosive environments. A stranded wire such as a transmission line that can be applied can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention.

[Explanation of symbols]

 11 Aluminum wire 12 High corrosion resistant aluminum alloy for electric conduction

Continued on the front page (72) Inventor Koichi Saruwatari 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Inventor Shoji Amimura 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Co., Ltd. ( 72) Inventor Shinji Katayama 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Inventor Yutaka Nagata 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Inventor Toshiaki Kumeda 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Inventor Mamoru Matsuo 1-2-1, Kinshi, Sumida-ku, Tokyo 20F Sky Aluminum Co., Ltd. (72) Inventor Yoshikazu Suzuki Tokyo 1-2-1 Kinshi, Sumida-ku Alca Central Building 20F Sky Aluminum Co., Ltd.

Claims (4)

[Claims] 1. An aluminum alloy containing 0.3 to 4.3% by weight of Mn, with the balance being Al and unavoidable impurities, and in which Al-Mn intermetallic compounds are dispersed and precipitated. A highly corrosion-resistant aluminum alloy wire for electric conduction, characterized by being made of an alloy. 2. A composition containing 0.3 to 4.3% by weight of Mn and 0.05 to 6.0% by weight of Mg, with the balance being Al and unavoidable impurities, and Al-Mn. A highly corrosion-resistant aluminum alloy wire for electrical conductivity, comprising an aluminum alloy in which a systemic intermetallic compound is dispersed and precipitated. 3. A core material of conductive aluminum or conductive aluminum alloy containing 0.3 to 4.3% by weight of Mn, the balance being composed of Al and unavoidable impurities. A highly corrosion-resistant composite wire for electric conduction, characterized by being coated with an aluminum alloy in which a Mn-based intermetallic compound is dispersed and precipitated. 4. A conductive aluminum or conductive aluminum alloy core material comprising: 0.3 to 4.3% by weight of Mn;
Of 0.05 to 6.0% by weight, with the balance being Al and unavoidable impurities, and coated with an aluminum alloy in which Al-Mn intermetallic compounds are dispersed and precipitated. A highly corrosion-resistant composite wire for electric conduction characterized by the above-mentioned.