JPH1088375A - Corrosion inhibitor, electric wire using the inhibitor and production of the wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a corrosion inhibitor resistant to deterioration and having resistance to corrosive matter for a long period, to prevent the stress corrosion of a conductor with the inhibitor and to obtain an electric wire capable of securing the necessary adhesion between the insulator and conductor when aerially being wired by adding a phenolic antioxidant and a thioetheric antioxidant to the sublimable corrosion inhibitor. SOLUTION: A corrosion inhibitor obtained by adding either the phenolic antioxidant and the thioetheric antioxidant or the thioetheric antioxidant and dimethyl thiopropinate to benzotriazole or its derivative is dissolved in a solvent to prepare the soln. The soln. is applied immediately after the hard-drawn copper wire 2a of an insulatod wire 1 is drawn by a drawing machine to the thickness to be stranded, and the wire is wound on a stranding bobbin. Further, when the plural wires 2a are concentrically stranded, the soln. is again applied on the wires 2a to be drawn out of the bobbin respectively and stranded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrosion inhibitor for a metal conductor of an overhead insulated wire, an electric wire using the corrosion inhibitor, and a method of manufacturing the wire.

[0002]

2. Description of the Related Art In general, conductors of an insulated wire often have a residual stress because they are subjected to a strong stress in a wire drawing process or a stranded wire process. When moisture penetrates into such an insulated wire (between the conductor and its covering insulator), a phenomenon (stress corrosion) in which the corrosion of the conductor by corrosive substances such as sulfide in the moisture is promoted by the residual stress described above occurs. It is known that stress corrosion breakage occurs, in which rust causes corrosion of the conductor to occur intensively, leading to breakage.

Conventionally, in order to prevent this stress corrosion disconnection,
The following measures have been taken. (1) The twisted conductor is rolled and compressed, and the residual stress due to tension and the residual stress due to bending generated during twisting are converted into compressive stress, which alleviates the stress and makes it less likely to cause stress corrosion.

(2) A gap between a conductor and an insulator is filled with a watertight compound to prevent water from entering the gap.

(3) A sublimation corrosion inhibitor such as benzotriazole (hereinafter abbreviated as BTA) or a derivative thereof as a corrosion inhibitor on the conductor surface, or an epoxy, phthalic acid, or phosphoric acid based agent A solution obtained by dissolving a solution to which a plasticizer is added in a solvent is applied.

(4) A sublimation corrosion inhibitor such as benzotriazole or a derivative thereof is added to an insulator covering a conductor.

[0007]

Although the above-mentioned countermeasures have been taken, the above (1) is not effective in preventing corrosion itself, and therefore has low effectiveness. A compression process must be added in addition to the process, which complicates the manufacturing process. Also, in the above (2), the work of filling the watertight compound when the conductor is coated with the insulator is troublesome,
There was a problem that productivity was poor and cost was high.

[0008] On the other hand, the above (3) is highly effective because it directly prevents corrosion of the conductor, but BTA or its derivative alone deteriorates quickly, and even when a plasticizer for protecting the deterioration is added. When the insulator covering the conductor is a general vinyl chloride (PVC) composition, the PVC composition absorbs the plasticizer serving as a corrosion inhibitor due to the good compatibility of the plasticizer, The plasticizer is transferred to the insulator, the sublimation corrosion inhibitor is deteriorated, the resistance of the conductor to sulfide is reduced, and there is a problem that stress corrosion cannot be prevented. In order to ensure resistance to this sulfide, there is a method of using an additive such as an oil that prevents the sublimation corrosion inhibitor from deteriorating, but the adhesion performance between the conductor and the insulator when the insulated wire is laid There was a problem such as insufficiency.

[0009] On the other hand, in the above (4), the sublimation corrosion inhibitor gradually moves to the conductor side in the insulator to form a rust-preventive film on the conductor surface. Depending on the type, the added sublimation corrosion inhibitor migrates to the surface of the insulator and loses its effect in a relatively short period of time, or the corrosive substances generated in the insulator reduce the rust prevention power. There was a problem of. In addition, the rust prevention performance of the conductor depends on the uniformity of the conductor surface.Especially in the case of corrosion in water containing corrosive substances, the electrochemical uniformity of the conductor surface is important. If the treatment is uneven, the surface condition (rust prevention film) is not necessarily improved even if the sublimation corrosion inhibitor is supplied from the insulator when the state of the rust prevention film on the conductor surface changes due to external force or the like. Had the problem of not connecting to

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an anticorrosion agent which is hardly deteriorated and has a long-term resistance to corrosive substances. It is an object of the present invention to provide an electric wire capable of ensuring the necessary adhesion performance between an insulator and a conductor when necessary, and a method of manufacturing an electric wire capable of reliably obtaining the above-described performance.

[0011]

The corrosion inhibitor according to the present invention is obtained by adding a phenolic antioxidant and a thioether antioxidant to a sublimable corrosion inhibitor. As described above, in the present invention, by adding two antioxidants, a phenolic antioxidant and a thioether antioxidant, to a sublimable corrosion inhibitor, those antioxidants exhibiting remarkable antioxidant properties when used in combination. The oxidizing agent effectively protects the sublimation corrosion inhibitor, significantly reduces the deterioration of the sublimation corrosion inhibitor, and ensures the rust prevention performance for a long period of time.

Further, the corrosion inhibitor according to the present invention contains dilauryl thiodipropionate as required. As described above, in the present invention, by adding dilauryl thiodipropionate, which exhibits remarkable antioxidant properties in combination with a thioether-based antioxidant, a plurality of antioxidants act on each other to cause sublimation corrosion. The inhibitor can be effectively protected, the deterioration of the sublimable corrosion inhibitor can be significantly reduced, and the rust prevention performance can be secured for a long period of time.

The corrosion inhibitor according to the present invention is obtained by adding a thioether antioxidant and dilauryl thiodipropionate to a sublimation corrosion inhibitor. As described above, in the present invention, by adding two antioxidants, a thioether-based antioxidant and dilauryl thiodipropionate, these antioxidants which exhibit remarkable antioxidant properties when used in combination can cause sublimation corrosion. This effectively protects the inhibitor and prevents deterioration, thereby ensuring rust prevention performance over a long period of time.

The corrosion inhibitor according to the present invention, if necessary, is one wherein the sublimable corrosion inhibitor is benzotriazole or a derivative thereof. As described above, in the present invention, by using benzotriazole or a derivative thereof having an effective anticorrosion property particularly for copper and copper alloys, a high rust prevention effect can be obtained when used for electric wires using copper as a conductor. Can be demonstrated.

Further, the electric wire according to the present invention is obtained by applying a solution obtained by dissolving any of the above-mentioned corrosion inhibitors in a solvent to the surface of a conductor. As described above, in the present invention, by applying a solution containing a sublimable corrosion inhibitor and two antioxidants having a property of exhibiting remarkable antioxidant property in combination with the conductor surface, two antioxidant substances are applied. The sublimation corrosion inhibitor, which is protected from deterioration by the excellent antioxidant function of the agent, ensures the rust prevention performance of the conductor for a long period of time, does not generate stress corrosion, and hardly causes disconnection.

Further, the electric wire according to the present invention may be
The conductor to which the solution of the corrosion inhibitor is applied is coated with an insulator to which a predetermined amount of the corrosion inhibitor is added. As described above, in the present invention, even when the state of the corrosion inhibitor film on the conductor surface changes due to external force, the sublimation corrosion inhibitor in the insulator is bonded to the conductor surface to maintain the corrosion resistance, and to prevent the stress corrosion. For a long time. Further, the sublimation corrosion inhibitor and the antioxidant do not deteriorate the adhesion performance between the conductor and the insulator, and maintain the strength of the electric wire even in an aerial state.

Further, in the method for manufacturing an electric wire according to the present invention, the solution prepared by dissolving the corrosion inhibitor described in any of the above in a solvent is used immediately before the twisting step of twisting a plurality of copper wires in the wire manufacturing process. It is applied to the surface of each copper wire and the surface of the stranded wire immediately after the twisting step. As described above, in the present invention, the conductor surface is uniformly applied to the conductor before and after the stranded wire to form a uniform rust preventive film. The sublimation corrosion inhibitor, which is protected from deterioration by the excellent antioxidant function of the two antioxidants, ensures the conductor's rust prevention performance over a long period of time. It can be a difficult electric wire.

In the method for producing an electric wire according to the present invention, if necessary, a solution prepared by dissolving the corrosion inhibitor in a solvent may be applied to the surface of the copper wire immediately after the copper wire drawing step in the electric wire manufacturing process. It is to be applied. As described above, in the present invention, the coating process is performed on the copper wire surface immediately after the wire drawing to form a uniform rust-proof film, so that the copper wire surface from the wire drawing process to immediately before the twisting process is slightly reduced. In addition, it is possible to prevent the conductor from deteriorating and prevent the conductor from being corroded more reliably, so that the electric wire is less likely to be disconnected due to stress corrosion.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

(One Embodiment of the Present Invention) One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic configuration diagram of an insulated wire according to the present embodiment, and FIG. 2 is an explanatory diagram of a process of applying a corrosion inhibitor to the insulated wire according to the present embodiment.

In each of the above figures, an insulated wire 1 according to the present embodiment comprises a twisted conductor 2 in which a plurality of hard copper wires 2a are twisted and a PVC composition coated on the twisted conductor by a known extrusion molding. And an insulating jacket 3.

On the surface of the twisted conductor 2, benzotriazole (BTA) or a derivative thereof, a phenolic antioxidant and a thioether antioxidant, or a thioether antioxidant and dilauryl thiodipropionate are used. Corrosion inhibitor to which one of the two combinations was added,
A solution formed by dissolving in a solvent such as trichloroethane, isopropyl alcohol and 1-bromopropane is applied,
Rust is prevented to prevent stress corrosion.

In the method of manufacturing the insulated wire 1, the hard copper wire 2a is drawn to a thickness (φ2.0 mm) to be stranded by drawing by a wire drawing machine 10 after passing through a known pre-process. The solution is applied and wound around a bobbin 21 for stranded wire. The first application prevents the hard copper wire 2a from being oxidized before twisting. Next, when a plurality of the hard copper wires 2a are concentrically twisted by the twisting machine 20, the solution is applied again to the hard copper wire 2a before being pulled out from each of the twisting bobbins 21 and twisted. Each of the applied hard copper wires 2a is twisted into a twisted conductor 2. The solution is further applied to the outer periphery of the twisted conductor 2. The application of this solution is performed by changing the state of the single-core hard copper wire 2a before twisting and the twisting conductor 2 after twisting.
By doing so in each state, the surface of each twisted wire is surely covered with the coating film. An insulating compound prepared by kneading BTA with the twisted conductor 2 is extruded at a temperature of 200 ° C. onto the twisted conductor 2 at a thickness of 2.5 mm at 200 ° C. to coat the twisted conductor 2 with an insulating jacket. 3 is assumed.

As described above, the insulated wire according to the present embodiment is provided with a phenolic antioxidant and a thioether on a conductor surface, in particular, benzotriazole or its derivative having an effective corrosion inhibitory effect on copper and copper alloy. By applying a corrosion inhibitor containing two antioxidants based on thioether, or two antioxidants based on thioether and dilauryl thiodipropionate, a significant antioxidant effect is obtained when used in combination. These antioxidants effectively protect the sublimation corrosion inhibitor, reduce the deterioration of the sublimation corrosion inhibitor, and secure high rust prevention performance for the copper conductor for a long period of time to prevent stress corrosion. Further, the sublimation corrosion inhibitor and each antioxidant do not deteriorate the adhesion performance between the conductor and the insulator, and secure the strength of the electric wire even in an aerial state. In addition, by adding BTA to the insulation jacket, even if the conductor surface condition changes due to external force, etc., the sublimation corrosion inhibitor in the insulator is bonded to the conductor surface to maintain corrosion resistance, and to maintain stress corrosion resistance. For a long time. In addition, the addition of a thioether-based antioxidant improves thermal oxidation deterioration prevention performance, reduces the deterioration of the rust prevention film (corrosion inhibitor) even under heat, and promotes rust prevention performance in various environments. Will be done.

The solvent for dissolving the corrosion inhibitor according to the above embodiment may be any solvent that can dissolve the sublimation corrosion inhibitor and the antioxidant. Time), the boiling point is 85
Use a solvent having a temperature of not more than ℃. Further, the corrosion inhibitor according to the embodiment can be used as a rust inhibitor for general copper or copper alloy products such as copper plates and copper wires, not limited to insulated wires.

In the corrosion inhibitor according to the above embodiment, two antioxidants of a phenolic antioxidant and a thioether antioxidant, or two antioxidants of a thioether antioxidant and dilauryl thiodipropionate are used. Two antioxidants are added, but if the ratio of addition is adjusted, dilauryl thiopropionate may be added in the former case, or a phenolic antioxidant may be added in the latter case. The antioxidant performance is enhanced by the synergistic effect of a plurality of antioxidants, and the deterioration of the sublimable corrosion inhibitor is suppressed, whereby the rust prevention performance is improved.

[0026]

The evaluation results of the insulated wire using the corrosion inhibitor according to the present invention and the insulated wire using only the sublimable corrosion inhibitor in the same manner as in the prior art in comparison with the conductor corrosion will be described. The corrosion inhibitors according to the present invention were compared with each other by using different combinations of sublimation corrosion inhibitors and antioxidants. As a first example, 1- [N, N-bis (2-ethylhexyl) aminomethyl] benzotriazole (hereinafter referred to as sample 1), which is a benzotriazole derivative, is used as a sublimable corrosion inhibitor. 3,9-bis [2- {3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy} -1,1-dimethylethyl] -2,4-as a phenolic antioxidant
8,10-Tetraoxaspiro [5,5] undecane (hereinafter referred to as sample 2) was converted to bis [2-methyl-4- {3-n-alkyl (C) as a thioether antioxidant.
12 or C14) thiopropionyloxy {-5-tert-butylphenyl] sulfide (hereinafter referred to as sample 3) was added, and a solution was obtained using trichloroethane as a solvent. The mixing ratio of each sample was 1.0 by weight.
%, 0.4% for sample 2, 0.4% for sample 3, and 98.2% for trichloroethane.

Next, as a second embodiment, a solution is prepared by using dilauryl thiodipropionate (hereinafter abbreviated as DLTP) instead of sample 2 which is a phenolic oxidizing agent in the first embodiment. Obtained. The mixing ratio is 1.0% for sample 1, 0.4% for sample 3, 0.4% for DLTP, and 98.2% for trichloroethane in weight ratio.

Next, as a third embodiment, a solution was obtained by replacing only the solvent in the first embodiment with 1-bromopropane. The mixing ratio is 1.0% for sample 1, 0.4% for sample 2, 0.4% for sample 3, and 98.2% for 1-bromopropane by weight ratio, respectively. Next, as a fourth embodiment, the second
A solution was obtained by substituting only 1-bromopropane for the solvent in the example of (1). The mixing ratio of each sample was 1.0 by weight.
%, 0.4% for sample 3, 0.4% for DLTP, and 98.2% for 1-bromopropane.

Next, as a fifth embodiment, a solution was obtained by changing the solvent in the first embodiment to isopropyl alcohol and changing the mixing ratio of each solute and solvent. The mixing ratio is 1.5% for sample 1, 0.6% for sample 2, 0.6% for sample 3, and 97.3% for isopropyl alcohol in weight ratio.

Next, as a sixth embodiment, a solution was obtained by using 1,2,3-benzotriazole (hereinafter abbreviated as BTA) instead of sample 1 in the first embodiment. The mixing ratio of BTA was 1.0%, that of Sample 2 was 0.4%, that of Sample 3 was 0.4%, and that of trichloroethane was 98.2% by weight.

Next, as a seventh embodiment, the ratio of the sample 2 in the first embodiment was halved and the DL was reduced by the reduced amount.
TP was added to obtain a solution. The mixing ratio was 1.0% for sample 1, 0.2% for sample 2, and 0.4% for sample 3 by weight.
%, DLTP 0.2%, trichloroethane 98.2
%. As a first comparative example, a solution was obtained by dissolving only BTA, which is a sublimable corrosion inhibitor, in a solvent, trichloroethane, as in the conventional case. The mixing ratio is B by weight.
TA is 0.5% and trichloroethane is 99.5%.

As a second comparative example, a solution was obtained by increasing the proportion of BTA in the first comparative example. The mixing ratio of BTA is 1.0% and trichloroethane is 99.0% by weight, respectively. Next, as a third comparative example, the first comparative example
In Comparative Example 2, the solvent was changed to isopropyl alcohol, and the mixture ratio of the solute and the solvent was changed to obtain a solution. The mixing ratio is BTA of 5.0% and isopropyl alcohol of 95.0% by weight, respectively.

Next, as a fourth comparative example, a solution was obtained using Sample 1 instead of BTA in the second comparative example.
The mixing ratio was 1.0% for sample 1 and 99.0% for trichloroethane in weight ratio. Table 1 summarizes the contents of the coating solutions and the mixing ratios in the above Examples and Comparative Examples.

[0034]

[Table 1]

A method of manufacturing an electric wire using each of the examples and comparative examples is as follows. First, a solution prepared by dissolving a sublimation corrosion inhibitor and each antioxidant in each solvent in the composition shown in Table 1 is first used as φ2.
A 0 mm hard copper wire is drip-coated, and when the 19 hard copper wires are further concentrically twisted, the solution is drip-coated at the time of the center 7-twist and the time of the outer layer 12-twist. φ
Table 2 shows a combination of a solution to be applied to the 2.0 mm hard copper wire and a solution to be applied when the 19 wires are concentrically twisted.

[0036]

[Table 2]

The insulator was coated on the stranded conductor (60 mm ² hard copper stranded wire) coated with the solution by a known extrusion molding to obtain an insulated wire. As the insulator, two types of OW electric wires and OE electric wires are manufactured by coating each of the PVC composition and the PE composition.

With respect to each of the insulated wires obtained as described above,
Corrosion resistance tests A and B and insulator pull-out test C shown below
Was carried out. In the corrosion resistance test A, 1
A sample having a length of 00 mm was cut and collected, and the stranded conductor after stripping the insulator was immersed in a 100 ppm aqueous solution of sodium sulfide for 30 seconds, 1 minute, 3 minutes, and 5 minutes. The discolored state was visually observed. The evaluation was performed with a mark ○ without discoloration, a mark Δ with slight discoloration, and a mark X with clear discoloration.

In the corrosion resistance test B, 3
A sample having a length of 00 mm was cut and collected.
200mm immersion depth in 0ppm ammonia solution
(A) One port, immersion depth 100 mm (b) Dry and wet with 1 cycle of 6 days, heat cycle of 8 hours at 60 ° C and 16 hours at room temperature for 1 week, replace with new ammonia aqueous solution Performed for a total of 8 weeks, and the middle of the sample was 100 mm
The average film thickness of copper oxide formed on the stranded conductor of (ab) was observed. The evaluation was performed with a circle having a thickness of less than 0.1 μm, a triangle having a thickness of 0.1 to 0.2 μm, and a cross having a thickness exceeding 0.2 μm.

The insulator pull-out test C was performed by cutting a sample having a length of 3 m from an insulated wire and collecting the cut sample.
At this point, the insulator was peeled off by 100 mm, the degree of withdrawal of the insulator when a load of 1000 kgf was applied to the insulator at the other end was observed, and the adhesion between the conductor and the insulator was evaluated. The evaluation was made on the assumption that the mark “○” was difficult to pull out, the mark “△” was slightly pulled out, and the mark “X” was largely drawn out. Table 3 shows the evaluation results for the OW wires in each test.
Table 4 shows the evaluation results of the OE wires.

[0041]

[Table 3]

[0042]

[Table 4]

In the corrosion resistance test A, discoloration was identified in the comparative example, but in each of the examples, no abnormality such as discoloration of the conductor was observed. It can be seen that the rust prevention performance of each example is significantly improved as compared with the comparative example. Further, in the corrosion resistance test B, in Comparative Example 1 in which the amount of BTA was small, the formation of copper oxide could be determined, but in each of the remaining Examples and Comparative Examples, the formation of copper oxide was confirmed as the film thickness. Could not.

Further, in the insulator pull-out test C, only the comparative example 3 in which the proportion of BTA was higher than the others showed a slight pull-out in the case of the OW wire, and resulted in a large pull-out in the case of the OE wire. The rest were confirmed to be difficult to pull out. Thus, even if the composition and solvent of the insulator are different, the corrosion inhibitor obtained by adding a plurality of antioxidants to the sublimable corrosion inhibitor ensures the resistance of the conductor to corrosive substances and prevents corrosion. In addition, it was confirmed that the adhesion performance between the conductor and the insulator was not impaired.

[0045]

As described above, according to the present invention, by adding two antioxidants, a phenolic antioxidant and a thioether antioxidant, to a sublimable corrosion inhibitor, a remarkable antioxidant effect is obtained when used in combination. These antioxidants exhibit the effect of effectively protecting the sublimation corrosion inhibitor, significantly reducing the deterioration of the sublimation corrosion inhibitor, and ensuring the rust prevention performance for a long period of time. Further, in the present invention, by adding dilauryl thiodipropionate, which exhibits remarkable antioxidant properties in combination with a thioether-based antioxidant, a plurality of antioxidants act on each other to prevent sublimation corrosion. This has the effect of effectively protecting the agent, significantly reducing the deterioration of the sublimable corrosion inhibitor, and ensuring the rust prevention performance over a long period of time. Also, in the present invention, by adding two antioxidants, a thioether-based antioxidant and dilauryl thiodipropionate, these antioxidants, which exhibit remarkable antioxidant properties in combination, can be used to prevent sublimation corrosion. This has the effect of effectively protecting the agent, preventing deterioration and ensuring rust prevention performance over a long period of time. In addition, in the present invention, by using benzotriazole or a derivative thereof having an effective corrosion inhibitory effect particularly on copper and copper alloys, a high rust prevention effect can be obtained when used for electric wires using copper as a conductor. It has the effect that it can be demonstrated. Further, in the present invention, the conductor surface is coated with a solution containing two antioxidants having the property of exhibiting remarkable antioxidant properties in combination with a sublimable corrosion inhibitor, thereby providing two antioxidants. The sublimation corrosion inhibitor, which is protected from deterioration by its excellent antioxidant function, has the effect of ensuring the rust prevention performance of the conductor for a long period of time, preventing stress corrosion from occurring and preventing disconnection. Further, in the present invention, even if the state of the corrosion inhibitor film on the conductor surface changes due to external force, the sublimation corrosion inhibitor in the insulator is bonded to the conductor surface to maintain the corrosion resistance performance and reduce stress corrosion. It has the effect of preventing over a long period of time. Further, the sublimation corrosion inhibitor and the antioxidant have the effect of maintaining the strength of the electric wire even in an aerial state without deteriorating the adhesion performance between the conductor and the insulator. Also, in the present invention, by performing a uniform coating treatment on the conductor surface before and after the stranded wire, and forming a uniform rust prevention film, the uniformity of the conductor surface state can be maintained, the rust prevention performance of the conductor The sublimation corrosion inhibitor, which is promoted and protected from deterioration by the excellent antioxidant function of the two antioxidants, secures the rust prevention performance of the conductor for a long time, does not cause stress corrosion and does not easily break. It has the effect that it can be an electric wire. Also,
In the present invention, the coating treatment is performed on the surface of the copper wire even immediately after drawing to form a uniform rust-proof film.
This also has the effect of preventing a slight deterioration of the surface of the copper wire from the wire drawing process to immediately before the stranded wire process, ensuring the prevention of corrosion of the conductor, and making the wire less likely to be broken by stress corrosion.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an insulated wire according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a manufacturing process of the insulated wire according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulated electric wire 2 Twisted conductor 2a Hard copper wire 3 Insulated jacket 10 Drawing machine 20 Twisting machine 21 Twisting bobbin 30 Coating mechanism

Claims (8)

[Claims] 1. A corrosion inhibitor characterized by adding a phenolic antioxidant and a thioether antioxidant to a sublimable corrosion inhibitor. 2. The corrosion inhibitor according to claim 1, wherein dilauryl thiodipropionate is added. 3. A corrosion inhibitor characterized by adding a thioether antioxidant and dilauryl thiodipropionate to a sublimable corrosion inhibitor. 4. The corrosion inhibitor according to claim 1, wherein the sublimable corrosion inhibitor is benzotriazole or a derivative thereof. 5. An electric wire, wherein a solution obtained by dissolving the corrosion inhibitor according to any one of claims 1 to 4 in a solvent is applied to the surface of a conductor. 6. The electric wire according to claim 5, wherein the conductor to which the solution of the corrosion inhibitor is applied is coated with an insulator to which a predetermined amount of the corrosion inhibitor is added. 7. A surface of each copper wire immediately before a twisting step of twisting a plurality of copper wires in a wire manufacturing process, using a solution obtained by dissolving the corrosion inhibitor according to any one of claims 1 to 4 in a solvent. And a method for producing an electric wire, wherein the method is applied to the surface of a stranded wire immediately after the twisting step. 8. The method of manufacturing an electric wire according to claim 7, wherein a solution obtained by dissolving the corrosion inhibitor in a solvent is applied to the surface of the copper wire immediately after the copper wire drawing step in the electric wire manufacturing process. A method of manufacturing an electric wire.