JP2015137950A - Corrosion detecting electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrosion detecting electric wire capable of detecting a corrosion state in real time.SOLUTION: A corrosion detecting electric wire 1 includes a first conductor 21 made of a first metal, a second conductor 22 which is spaced from the first conductor 21 and is disposed substantially in parallel with the first conductor 21 and is made of a second metal different from the first metal, and an electrically insulating sheath 3 covering the first conductor 21 and the second conductor 22. The corrosion detecting electric wire 1 has, at an electric wire front end part, a corrosion detection part 4 formed by exposing the first conductor 21 and the second conductor 22 to the outside in a state where the first conductor 21 and the second conductor 22 are spaced from each other.

Description

  The present invention relates to a corrosion detection electric wire.

  Conventionally, in the field of vehicles such as automobiles, wire harnesses are used to connect various electric / electronic devices and the like. The wire harness generally has an insulated wire having an inner conductor made of copper or copper alloy, and a connector terminal made of copper or copper alloy electrically connected to the inner conductor of the insulated wire.

  In recent years, from the viewpoint of reducing the weight of a vehicle, aluminum or aluminum alloy that is lighter than copper or copper alloy has been applied as an inner conductor of an insulated wire. Therefore, the chance that a wire harness is used in the situation where the metal which comprises an internal conductor differs from the metal which comprises a connector terminal is increasing. Therefore, corrosion that occurs between different metals becomes a major problem.

  For example, in the field of vehicles, the corrosion status is usually confirmed as follows. First, a wire harness sample is attached to a predetermined portion of a test vehicle that is likely to be corroded by contact with an electrolyte such as water or salt water. Next, the test vehicle is allowed to run for a certain time in a corrosive environment. Next, the running of the test vehicle is stopped, and the corrosion state of the sample is visually confirmed.

  Patent Document 1 preceding this application discloses a technique for detecting corrosion of an overhead power transmission line by measuring the axial force of a bolt that applies a tightening force to a ring attached to the overhead power transmission line with a strain gauge. Has been.

Japanese Patent No. 5290866

  However, as described above, the method of confirming the corrosion state using the wire harness sample has a drawback that it is impossible to accurately grasp at which point the corrosion between different metals has occurred. Note that a technique using a strain meter is not realistic because the configuration becomes complicated.

  The present invention has been made in view of the above background, and an object of the present invention is to provide a corrosion detection electric wire capable of detecting a corrosion state in real time.

One aspect of the present invention includes a first conductor made of a first metal,
A second conductor made of a second metal different from the first metal, disposed substantially parallel to the first conductor in a state of being separated from the first conductor;
An electrically insulating sheath covering the first conductor and the second conductor;
A tip of the electric wire has a corrosion detection part in which the first conductor and the second conductor are exposed to the outside while the first conductor and the second conductor are separated from each other. It is in the corrosion detection wire.

  The said corrosion detection electric wire has the corrosion detection part by which the 1st conductor and the 2nd conductor are exposed outside in the state which the 1st conductor and the 2nd conductor left | separated mutually at the front-end | tip part of an electric wire.

  Therefore, in the corrosion detection electric wire, when the corrosion detection part at the tip of the electric wire is arranged at a portion where the corrosion state is desired to be detected, and an electrolytic solution such as water or salt water contacts the first conductor and the second conductor exposed to the outside, A potential difference is generated between the first conductor and the second conductor. Therefore, it is possible to quantify the corrosive environment based on the potential difference data by measuring this potential difference, for example, on the electric wire base end side.

  Therefore, according to the said corrosion detection electric wire, it becomes possible to detect a corrosion condition in real time by a comparatively simple structure. Moreover, since the said corrosion detection electric wire has an electric wire form, it also has an advantage which is easy to route freely to a wire harness.

It is an external appearance perspective view which shows typically the corrosion detection electric wire of Example 1. FIG. It is II-II sectional drawing of FIG. It is explanatory drawing for demonstrating the corrosion detection method using the corrosion detection electric wire of Example 1. FIG. It is an external appearance perspective view which shows the corrosion detection electric wire of Example 2 typically. It is VV sectional drawing of FIG. It is explanatory drawing for demonstrating the corrosion detection method using the corrosion detection electric wire of Example 2. FIG. It is sectional drawing of the corrosion detection electric wire of Example 3 corresponding to FIG. It is explanatory drawing for demonstrating the corrosion detection method using the corrosion detection electric wire of Example 3. FIG. It is explanatory drawing for demonstrating the result of the corrosion test using the corrosion detection electric wire of Example 2. FIG.

  As for the said corrosion detection electric wire, the 1st conductor and the 2nd conductor are exposed outside in the corrosion detection part of an electric wire front-end | tip part. Specifically, for example, the corrosion detection electric wire can be configured such that the front end surface of the first conductor and the front end surface of the second conductor are exposed to the outside in the corrosion detection unit at the front end of the electric wire. In this case, it is difficult for the first conductor and the second conductor to be short-circuited due to accidental contact with the conductive member present in the corrosive environment, and the electrolyte is reliably in contact with the first conductor and the second conductor. There are advantages that can be made.

  Corrosion between dissimilar metals in a wire harness having an insulated wire having an inner conductor made of a first metal and a connector terminal electrically connected to the inner conductor and having a second metal as a base material. It can be suitably used for detecting. The connector terminal may have one or more plating layers made of a metal different from the first metal and the second metal on the surface of the base material.

  In the corrosion detection electric wire, specifically, aluminum or an aluminum alloy can be used as the first metal. Moreover, specifically, copper or a copper alloy can be used for the second metal.

  In this case, between the dissimilar metals in the wire harness having an insulated wire having an inner conductor made of aluminum or an aluminum alloy and a connector terminal electrically connected to the inner conductor and having copper or a copper alloy as a base material. A corrosion detecting wire useful for detecting corrosion in real time can be obtained.

  The said corrosion detection electric wire can be set as the structure by which the electric insulator is coat | covered on the outer periphery of any one of a 1st conductor or a 2nd conductor. Or the said corrosion detection electric wire can be set as the structure by which the outer periphery of both the 1st conductor and the 2nd conductor is each coat | covered with the electrical insulator.

  In these cases, since an electrical insulator is interposed between the first conductor and the second conductor, the electrical insulation between the first conductor and the second conductor is ensured. Therefore, the potential difference between the first conductor and the second conductor can be measured with high accuracy, and a corrosion detection electric wire capable of detecting the corrosion state with high accuracy in real time can be obtained. In addition, since the electrical insulator is interposed between the first conductor and the second conductor, the sheath is easily covered with the first conductor and the second conductor being reliably separated from each other. Therefore, the corrosion detection electric wire excellent in manufacturability is obtained.

  The corrosion detection electric wire may include a plurality of first conductors and a plurality of second conductors, and the first conductor and the second conductor may be alternately arranged in one direction perpendicular to the electric wire axial direction. it can.

  In this case, since the first conductor and the second conductor are alternately arranged on the same plane and these conductors are covered with the sheath, a flat-shaped corrosion detection electric wire is obtained. Therefore, the corrosion detection electric wire which can detect the corrosion condition in real time by arranging the corrosion detection part at the tip of the electric wire in a relatively narrow space such as a gap can be obtained. In this case, since a plurality of conductor pairs composed of the adjacent first conductor and second conductor are formed, the potential difference can be measured using a plurality of conductor pairs. Therefore, a corrosion detection electric wire capable of detecting the corrosion state with high accuracy in real time can be obtained. In this case, the area where the electrolytic solution can be attached increases, which is advantageous for the measurement of the potential difference.

  In the above case, a groove may be formed on the surface of the sheath positioned between adjacent conductor pairs. In this case, a plurality of corrosion detection parts can be formed by partially dividing the corrosion detection electric wire along the groove part from the wire tip side. For this reason, it is possible to dispose a plurality of divided corrosion detection units in a plurality of portions where it is desired to detect the corrosion status, and detect the corrosion status in real time.

  In the corrosion detecting electric wire, examples of the material of the electrical insulator include, for example, various resins and rubbers (including elastomers) usually used for the electric wire. Specifically, the electrical insulator can be composed of an ultraviolet curable resin. The electrical insulator may contain one or more various additives generally applied to electric wires.

  The ultraviolet curable resin can have a relatively low viscosity. Therefore, in this case, the electrical insulator can be very thinly extruded and covered on the outer periphery of the first conductor and / or the second conductor. Therefore, a corrosion detection electric wire is obtained in which the outer circumference of the first conductor and / or the second conductor is covered with a relatively thin electrical insulator. Moreover, according to this corrosion detection electric wire, the electrical insulation between a 1st conductor and a 2nd conductor is ensured reliably. In addition, as described above, since it is possible to extrude and coat the electrical insulator, the distance between the peripheral surface of the first conductor and the peripheral surface of the second conductor is shortened, and the first conductor and the second conductor The electrolyte easily adheres to both of the conductors. Therefore, it is advantageous for the measurement of the potential difference.

  In the corrosion detection electric wire, examples of the material of the sheath include various resins and rubbers (including elastomers) usually used for the electric wire. Specifically, the sheath can be composed of an ultraviolet curable resin. The sheath may contain one or more various additives that are generally applied to electric wires.

  As described above, the ultraviolet curable resin can have a relatively low viscosity. Therefore, in this case, the sheath can be extremely thinly extruded and covered around the outer periphery of the first conductor and the second conductor. Therefore, a thin corrosion detection electric wire in which the first conductor and the second conductor are collectively covered by a relatively thin sheath can be obtained.

  Specifically, as the ultraviolet curable resin, for example, a urethane acrylate ultraviolet curable resin can be suitably used from the viewpoint of extrusion coverage, electrical insulation, and the like.

  In the corrosion detection electric wire, the first conductor and the second conductor are arranged substantially parallel to each other while being separated from each other. In the corrosion detection electric wire, the first conductor and the second conductor are not in direct contact with each other and are electrically insulated from each other, and the electrolytic solution adheres to the corrosion detection portion in a corrosive environment. In this case, the first conductor and the second conductor need only be separated to such an extent that the electrolyte solution can contact the first conductor and the second conductor. Note that “substantially parallel” includes not only the case of being completely parallel but also a range that is recognized as being substantially parallel.

  In the corrosion detection electric wire, the distance between the peripheral surface of the first conductor and the peripheral surface of the second conductor (the shortest distance between both surfaces) is specifically within a range of 10 to 80 μm. preferable.

  In this case, electrical insulation between the first conductor and the second conductor can be ensured. In addition, when the electrolytic solution adheres to the corrosion detection unit in a corrosive environment, the electrolytic solution easily comes into contact with the first conductor and the second conductor, and the corrosion state is easily detected in real time.

  The distance between the peripheral surface of the first conductor and the peripheral surface of the second conductor is preferably 20 μm or more, more preferably 30 μm or more, and even more preferably 40 μm or more from the viewpoint of ensuring electrical insulation. be able to. In addition, the distance between the peripheral surface of the first conductor and the peripheral surface of the second conductor is preferably from the viewpoint that the electrolytic solution easily contacts both the first conductor and the second conductor in the corrosion detector. May be 75 μm or less, more preferably 70 μm or less, still more preferably 65 μm or less, and even more preferably 60 μm or less.

  In the corrosion detection electric wire, the conductor diameters of the first conductor and the second conductor are preferably 100 μm or more, more preferably 120 μm or more, and further preferably 150 μm or more, from the viewpoint of securing the area of the portion to be brought into contact with the electrolytic solution. can do. Further, the conductor diameters of the first conductor and the second conductor are preferably 300 μm or less, more preferably 280 μm or less, and further preferably 250 μm or less from the viewpoint of reducing the diameter of the corrosion detecting electric wire.

  In the corrosion detection electric wire, the thickness of the electrical insulator is preferably 5 μm or more, more preferably 10 μm or more, further preferably 15 μm or more, and even more preferably 20 μm or more, from the viewpoint of ensuring reliable electrical insulation. can do. In addition, the thickness of the electrical insulator is preferably 40 μm or less, more preferably 35 μm or less, and still more preferably from the viewpoint that the electrolytic solution can easily come into contact with both the first conductor and the second conductor in the corrosion detector. Can be 30 μm or less.

  In the corrosion detection electric wire, the thickness of the sheath (the shortest distance between the peripheral surface of the conductor and the peripheral surface of the sheath) is preferably 20 μm or more, more preferably 30 μm or more, from the viewpoint of manufacturing restrictions. Preferably, it can be 40 μm or more. In addition, the thickness of the sheath is preferably 80 μm or less, more preferably 70 μm or less, and even more preferably 60 μm or less, from the viewpoint of restriction of detection sensitivity.

  In addition, each structure mentioned above can be arbitrarily combined as needed, in order to acquire each effect etc. which were mentioned above.

  Hereinafter, the corrosion detection electric wire of an Example is demonstrated using drawing. In addition, about the same member, it demonstrates using the same code | symbol.

Example 1
The corrosion detection electric wire of Example 1 is demonstrated using FIGS. 1-3. As shown in FIGS. 1 to 3, the corrosion detection electric wire 1 of the present example is disposed substantially parallel to the first conductor 21 in a state of being separated from the first conductor 21 and the first conductor 21 made of the first metal. And a second conductor 22 made of a second metal different from the first metal, and an electrically insulating sheath 3 covering the first conductor 21 and the second conductor 22.

  Here, in the corrosion detection electric wire 1 of the present example, the first conductor 21 and the second conductor 22 are exposed to the outside while the first conductor 21 and the second conductor 22 are separated from each other at the tip of the electric wire. It has the corrosion detection part 4 which becomes. This will be described in detail below.

  Specifically, the corrosion detection electric wire 1 has one first conductor 21 and one second conductor 22 respectively. Specifically, the first metal constituting the first conductor 21 is aluminum or an aluminum alloy, and the second metal constituting the second conductor 22 is specifically copper or a copper alloy. In addition, both the 1st metal and the 2nd metal are softened by performing the annealing process. The conductor diameters of the first conductor 21 and the second conductor 22 are both 200 μm. The distance t between the peripheral surface of the first conductor 21 and the peripheral surface of the second conductor 22 is 50 μm.

  In the corrosion detection electric wire 1, the front end surface of the first conductor 21 and the front end surface of the second conductor 22 are exposed to the outside in the corrosion detection unit 4 at the front end of the electric wire. In addition, as for the electric wire base end part of the corrosion detection electric wire 1, a part of the sheath 3 is peeled off, and the base end parts of the first conductor 21 and the second conductor 22 are exposed. When measuring the potential difference between the first conductor 21 and the second conductor 22 at the exposed base end of the first conductor 21 and the exposed base end of the second conductor 22, the potential difference measuring device 9. Is connected.

  The sheath 3 is made of urethane acrylate-based ultraviolet curable resin. The sheath thickness s is 50 μm. The sheath 3 is formed by extruding and coating a low-viscosity UV curable resin on the outer periphery of the first conductor 21 and the second conductor 22 that are arranged in parallel in a state of being separated from each other, and then irradiating and curing the UV light. Has been.

  The corrosion detecting electric wire 1 is a dissimilar metal in a wire harness having an insulated electric wire having an inner conductor made of aluminum or an aluminum alloy and a connector terminal electrically connected to the inner conductor and made of copper or a copper alloy as a base material. Used to detect corrosion during.

  Next, the effect of the corrosion detection electric wire 1 of this example is demonstrated.

  The corrosion detection electric wire 1 of this example has the above configuration. In particular, the corrosion detection electric wire 1 is a corrosion detection unit in which the first conductor 21 and the second conductor 22 are exposed to the outside while the first conductor 21 and the second conductor 22 are separated from each other at the tip of the electric wire. 4.

  Therefore, the corrosion detection electric wire 1 is provided with the corrosion detection portion 4 at the tip of the electric wire at a portion where the corrosion state is desired to be detected, and an electrolytic solution such as water or salt water is applied to the first conductor 21 and the second conductor 22 exposed to the outside. Upon contact, a potential difference is generated between the first conductor 21 and the second conductor 22. Therefore, the corrosive environment can be quantified based on the potential difference data by measuring this potential difference on the electric wire base end side using the potential difference measuring device 9. Therefore, according to the corrosion detection electric wire 1, it becomes possible to detect a corrosion condition in real time with a relatively simple configuration.

  Moreover, since the corrosion detection electric wire 1 has an electric wire form, it also has the advantage that it is easy to arrange a wire harness freely. Therefore, when the corrosion detection electric wire 1 is applied to, for example, a test vehicle, a tester of the test vehicle can accurately know the corrosion state of the wire harness based on the measurement result of the potential difference. Therefore, the tester can grasp the timing of replacing the parts of the wire harness with high accuracy.

  Further, the corrosion detecting electric wire 1 uses an ultraviolet curable resin for the sheath 3. Therefore, the corrosion detecting electric wire 1 can cover the outer periphery of the first conductor 21 and the second conductor 22 by extruding the sheath 3 in an extremely thin manner at the time of manufacture. Therefore, the corrosion detection electric wire 1 can be configured as a thin electric wire in which the first conductor 21 and the second conductor 22 are collectively covered by the relatively thin walled sheath 3.

(Example 2)
The corrosion detection electric wire of Example 2 is demonstrated using FIGS.

  The corrosion detection electric wire 1 of this example has a plurality of first conductors 21 and a plurality of second conductors 22. The first conductors 21 and the second conductors 22 are alternately arranged in one direction perpendicular to the wire axis direction. The outer circumferences of both the first conductor 21 and the second conductor 22 are covered with electrical insulators 211 and 222, respectively.

  Specifically, the corrosion detection electric wire 1 has two first conductors 21 and two second conductors 22. The conductors 21 and 22 are alternately arranged in the order of the first conductor 21, the second conductor 22, the first conductor 21, and the second conductor 22 in one direction perpendicular to the wire axis direction.

  The electrical insulators 211 and 222 are both made of the same urethane acrylate-based ultraviolet curable resin. The thicknesses of the electrical insulators 211 and 222 are both 25 μm. In this example, the peripheral surface of the electrical insulator 211 is in contact with the peripheral surface of the electrical insulator 222. Therefore, the distance t between the peripheral surface of the first conductor 21 and the peripheral surface of the second conductor 22 is 50 μm. Other configurations are the same as those of the first embodiment.

  In addition, the corrosion detection electric wire 1 of this example can be manufactured as follows, for example. The outer periphery of the first conductor 21 is covered with an electrical insulator 211 by extruding and coating a low-viscosity ultraviolet curable resin and irradiating and curing the ultraviolet ray. Similarly, the outer periphery of the second conductor 22 is covered with an electric insulator 222 by extruding and coating a low-viscosity ultraviolet curable resin and irradiating and curing the ultraviolet ray. Next, the first conductor 21 covered with the electrical insulator 211 and the second conductor 22 covered with the electrical insulator 222 are alternately arranged in a state where the electrical insulator 211 and the electrical insulator 222 are in contact with each other. Next, a low-viscosity ultraviolet curable resin is extruded and coated on the outer periphery of the arrangement body and cured by irradiating with ultraviolet rays to form the sheath 3.

  Next, the effect of the corrosion detection electric wire 1 of this example is demonstrated.

  In the corrosion detection electric wire 1 of this example, since the electrical insulators 211 and 222 are interposed between the first conductor 21 and the second conductor 22, electrical insulation between the first conductor 21 and the second conductor 22 is ensured. It will be something. Therefore, the corrosion detection electric wire 1 can measure the potential difference between the first conductor 21 and the second conductor 22 with high accuracy, and can detect the corrosion state with high accuracy in real time. . In addition, since the electrical insulators 211 and 222 are interposed between the first conductor 21 and the second conductor 22, it is easy to cover the sheath 3 in a state where the first conductor 21 and the second conductor 22 are reliably separated from each other. Become. Therefore, the corrosion detection electric wire 1 is excellent in manufacturability.

  Moreover, the corrosion detection electric wire 1 has a plurality of first conductors 21 and second conductors 22 respectively, and the first conductors 1 and the second conductors 22 are alternately arranged in one direction perpendicular to the electric wire axial direction. Yes. Therefore, the corrosion detection electric wire 1 of the present example has a flat shape because the first conductors 21 and the second conductors 22 are alternately arranged on the same plane, and the conductors 21 and 22 are covered with the sheath 3. Can do. Therefore, the corrosion detection electric wire 1 can detect the corrosion state in real time by disposing the corrosion detection unit 4 at the tip of the electric wire in a relatively narrow space such as a gap. Moreover, since the corrosion detection electric wire 1 is formed with a plurality of conductor pairs 23 including the first conductor 21 and the second conductor 22 adjacent to each other, it is possible to measure a potential difference using the plurality of conductor pairs 23. Become. Therefore, the corrosion detection electric wire 1 can detect the corrosion state with high accuracy in real time. In addition, the corrosion detecting electric wire 1 of this example is advantageous in measuring the potential difference because the area on which the electrolytic solution can be attached increases.

  Moreover, the corrosion detection electric wire 1 uses ultraviolet curable resin for the electrical insulators 211 and 222. Therefore, the corrosion detection electric wire 1 can be coated with the electrical insulator 211 on the outer periphery of the first conductor 21 and the electrical insulator 222 on the outer periphery of the second conductor 22 with a very thin extrusion. Therefore, the corrosion detection electric wire 1 can be an electric wire in which the outer circumferences of the first conductor 21 and the second conductor 22 are respectively covered with relatively thin walled electrical insulators 211 and 222. Other functions and effects are the same as those of the first embodiment.

(Example 3)
The corrosion detection electric wire of Example 3 is demonstrated using FIG. 7, FIG.

  In the corrosion detecting electric wire 1 of the present example, the groove portion 5 is formed on the surface of the sheath 3 located between the adjacent conductor pairs 23 and 23. In this example, the groove 5 is formed on both flat surfaces of the sheath 3. The groove portion 5 may be formed only on one surface of the sheath 3. Further, the terminal pair 23 is in a separated state. Other configurations are the same as those of the second embodiment.

  Next, the effect of the corrosion detection electric wire 1 of this example is demonstrated.

  As illustrated in FIG. 8, the corrosion detection electric wire 1 of this example includes a plurality of corrosion detection units 4 (in this example, by partially dividing the corrosion detection electric wire 1 from the wire tip end side along the groove portion 5. 2) can be formed.

  Therefore, the corrosion detection electric wire 1 can arrange | position the some corrosion detection part 4 divided | segmented in the some part which wants to detect a corrosion condition, respectively, and can detect a corrosion condition in real time. Other functions and effects are the same as those of the second embodiment.

<Experimental example>
Hereinafter, it demonstrates more concretely using an experiment example.
A corrosion test was performed using the corrosion detection electric wire having the configuration of Example 2. Specifically, the corrosion detector was immersed in 5% saline or 10% saline, and the potential difference between the first conductor and the second conductor was measured with a potentiometer. For comparison, the potential difference between the first conductor and the second conductor was measured with a potentiometer without immersing the corrosion detector in saline. The first conductor is specifically made of soft aluminum, and the second conductor is specifically made of soft copper. The potentiometer is GL220 Ver. Manufactured by GRAPHTEC Corporation. 1.02 was used, and the potential difference measurement interval was 1 second. The result is shown in FIG.

  As shown in FIG. 9, the potential difference between the first conductor and the second conductor is zero when no salt solution is in contact with the corrosion detection unit. On the other hand, when salt solution contacts a corrosion detection part, it turns out that a potential difference arises between the 1st conductor and the 2nd conductor. Therefore, according to this result, it can be said that the corrosive environment can be quantified based on the potential difference data. Therefore, according to the said corrosion detection electric wire, it can be said that a corrosion condition can be detected in real time.

  As mentioned above, although the Example of this invention was described in detail, this invention is not limited to the said Example, A various change is possible within the range which does not impair the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Corrosion detection electric wire 21 1st conductor 22 2nd conductor 3 Sheath 4 Corrosion detection part

Claims (7)

A first conductor made of a first metal;
A second conductor made of a second metal different from the first metal, disposed substantially parallel to the first conductor in a state of being separated from the first conductor;
An electrically insulating sheath covering the first conductor and the second conductor;
A tip of the electric wire has a corrosion detection part in which the first conductor and the second conductor are exposed to the outside while the first conductor and the second conductor are separated from each other. Corrosion detection wire. The first metal is aluminum or an aluminum alloy,
The corrosion detection electric wire according to claim 1, wherein the second metal is copper or a copper alloy. The outer circumference of either the first conductor or the second conductor is covered with an electrical insulator, or
The corrosion detection electric wire according to claim 1 or 2, wherein the outer circumferences of both the first conductor and the second conductor are respectively coated with an electrical insulator. A plurality of the first conductor and the second conductor,
The corrosion detection electric wire according to any one of claims 1 to 3, wherein the first conductor and the second conductor are alternately arranged in one direction perpendicular to the electric wire axial direction.   The corrosion detection electric wire according to any one of claims 1 to 4, wherein the electrical insulator is made of an ultraviolet curable resin.   The corrosion detection electric wire according to any one of claims 1 to 5, wherein the sheath is made of an ultraviolet curable resin.   The distance between the peripheral surface of the said 1st conductor and the peripheral surface of the said 2nd conductor shall be in the range of 10-80 micrometers, The any one of Claims 1-6 characterized by the above-mentioned. Corrosion detection wire.

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