JP2016225112A - Wire with terminal and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire with terminal which is capable of suppressing corrosion in an electric contact part between a wire conductor and a terminal fitting, facilitates application of an anticorrosion agent and is capable of surely applying the anticorrosive agent only to a required portion, and a manufacturing method thereof.SOLUTION: When manufacturing a coated wire with terminal comprising an anticorrosive agent application part which applies the anticorrosive agent to a connection part connecting a terminal to an end of a coated wire of which the conductor is coated with an insulator, the application of the anticorrosive agent is performed by bringing the anticorrosive agent into contact with the connection part from a lower side of the connection part and permeating the anticorrosive agent into the connection part. The anticorrosive agent satisfies a formula (1) η/(γ cosθ)≤600 where η is viscosity (mPa s), γ is a surface tension (mN/m) and θ is a contact angle (°).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a terminal-attached electric wire and a method for manufacturing the electric wire.

  2. Description of the Related Art Conventionally, movements to improve fuel efficiency have been accelerated by reducing the weight of vehicles such as automobiles, and there has been a demand for reducing the weight of electric wire materials constituting wire harnesses. Therefore, the use of aluminum for the wire conductor has been studied.

  However, copper or a copper alloy having excellent electrical characteristics is generally used for the terminal fitting. Therefore, it is often used in a combination of an aluminum electric wire and a copper terminal fitting. If the material of the wire conductor and the terminal fitting are different, corrosion due to contact with different metals occurs at the electrical connection portion. This type of corrosion is more likely to occur than when the wire conductor and the terminal fitting are the same material. Therefore, an anticorrosive agent that can reliably prevent the electrical connection portion is required.

  It is desirable that the anticorrosive is present only in the necessary part. For example, if the anticorrosive agent protrudes and is applied to the connection part between the terminals, the connection failure of the terminal is caused. In order to prevent corrosion in the electrical connection part, for example, Patent Document 1 discloses a technique of using two or more kinds of resins having different viscosities and sealing an end part of an electric wire connected to an electric wire conductor ( Patent Document 1).

JP 2011-238500 A

  Specifically, the means described in Patent Document 1 applies a first UV curable resin having a low viscosity before curing to the terminal connection part, allows the resin to penetrate into the gap between the connection parts, and then the viscosity before curing. The second UV curable resin having a high thickness is applied to form an anticorrosive having a sufficient film thickness.

  However, like the above means, using two types of resins with different viscosities and applying anti-corrosion treatment in two stages means preparing two types of resins, increasing the number of processes, etc. There was a problem that the work would be complicated.

  The object of the present invention is to solve the above-mentioned problems of the prior art, and it is easy to apply the anticorrosive agent, and it is possible to apply the anticorrosive agent only to the necessary parts without fail, An object of the present invention is to provide a terminal-attached electric wire and a method for manufacturing the same, which can suppress corrosion of an electrical contact portion of the terminal fitting.

In order to solve the above problems, the electric wire with terminal of the present invention is
An electric wire with a terminal provided with an anticorrosive agent-applied portion in which an anticorrosive agent is applied to a connection portion in which a terminal is connected to an end portion of a covered electric wire whose conductor is covered with an insulator,
Application of the anticorrosive agent is performed by bringing the anticorrosive agent into contact with the connecting portion from below the connecting portion and allowing the anticorrosive agent to penetrate into the connecting portion,
The anticorrosive agent satisfies the following formula 1.
(Formula 1)
η / (γ · cosθ) ≦ 600
In Equation 1, η is the viscosity (mPa · s), γ is the surface tension (mN / m), and θ is the contact angle (°).

  In the electric wire with a terminal of the present invention, it is preferable that the conductor of the covered electric wire is an aluminum-based metal, the terminal fitting is a copper-based metal, and the connecting portion is a dissimilar metal connecting portion.

The manufacturing method of the electric wire with terminal of the present invention is as follows.
A method of manufacturing a coated electric wire with a terminal comprising an anticorrosive agent coating portion in which an anticorrosive agent is applied to a connection portion in which a terminal is connected to an end portion of a covered electric wire whose conductor is covered with an insulator,
Application of the anticorrosive agent is performed by bringing the anticorrosive agent into contact with the connecting portion from below the connecting portion and allowing the anticorrosive agent to penetrate into the connecting portion,
The anticorrosive agent satisfies the following formula 1.
(Formula 1)
η / (γ · cosθ) ≦ 600
In Equation 1, η is the viscosity (mPa · s), γ is the surface tension (mN / m), and θ is the contact angle (°).

  In the method for manufacturing a terminal-attached electric wire according to the present invention, the anticorrosive agent uses a curable resin, and the anticorrosive agent is preferably applied at room temperature.

  In the present invention, since the anticorrosive agent is applied by bringing the anticorrosive agent into contact with the connecting portion from below the connecting portion and allowing the anticorrosive agent to penetrate into the connecting portion, the anticorrosive agent is applied. It is easy, and it is possible to reliably apply the anticorrosive agent only to the necessary part. In that case, since the anticorrosive agent is configured to satisfy the above (formula 1), the anticorrosive agent can be sufficiently penetrated into a necessary portion, and the anticorrosive agent adheres to an unnecessary portion. In addition, it is possible to prevent a problem that the anticorrosive is not applied to a necessary portion. As a result, corrosion of the electric contact portion of the electric wire conductor of the electric wire with terminal and the terminal fitting can be satisfactorily suppressed. Moreover, according to this invention, it is possible to manufacture the said electric wire with a terminal easily.

FIG. 1 is a front view showing an embodiment of a terminal-attached electric wire according to the present invention. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is an explanatory view showing a method of applying an anticorrosive to the electric wire with terminal.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing an embodiment of a terminal-attached electric wire according to the present invention. As shown in FIG. 1, the terminal-attached electric wire 110 is formed by crimping a terminal 130 on a covered electric wire 120, and the core wire 121 and the terminal 130 of the covered electric wire 120 are made of different metals. Hereinafter, an example of the electric wire 110 with a terminal is shown.

  The covered electric wire 120 is formed by covering a core wire 121 made of an aluminum (or aluminum alloy) wire as a conductor with a covering material 124 formed of an insulator such as a resin. Here, the core wire 121 is formed by twisting a plurality of aluminum (aluminum alloy) wires. And the edge part of the covered electric wire 120 is processed so that the coating | coated material 124 may be peeled off and the core wire 121 may be exposed. Hereinafter, the portion of the core wire 121 where the coating material 124 is peeled off and exposed is sometimes referred to as a core wire end portion.

  The insulated wire 120 can be an insulated wire used in a wire harness for automobiles. The core wire 121 of the covered electric wire 120 can be composed of a stranded wire formed by twisting a plurality of strands. The stranded wire may be composed of one type of metal strand, or may be composed of two or more types of metal strand. Moreover, the twisted wire may contain the strand etc. which consist of organic fibers other than a metal strand. Note that “consisting of one type of metal strand” means that all the metal strands constituting the stranded wire are made of the same metal material, and “consisting of two or more types of metal strands” This means that the wire contains metal wires made of different metal materials. The stranded wire may include a reinforcing wire (tension member) for reinforcing the covered electric wire.

  Examples of the material of the metal wire constituting the core wire 121 include copper, copper alloy, aluminum, or a material obtained by applying various platings to these materials in addition to the aluminum alloy. Moreover, as a material of the metal strand as a reinforcement wire, a copper alloy, titanium, tungsten, stainless steel etc. can be illustrated. Examples of the organic fiber as the reinforcing wire include Kevlar. As a metal strand used for the core wire 121, it is preferable to use aluminum or aluminum alloy from the point of weight reduction of an electric wire.

  The material of the covering material 124 used for the covered electric wire 120 is not particularly limited, and examples thereof include rubber, polyolefin, vinyl chloride resin (PVC), and thermoplastic elastomer. These may be used alone or in admixture of two or more. Various additives may be appropriately added to the material of the covering material 124. Examples of the additive include a flame retardant, a filler, a colorant and the like.

  The terminal 130 is formed long in one direction, and has a terminal fitting portion 112, a core wire crimping portion 114, and a covering crimping portion 116 in that order from the distal end side to the proximal end side in the longitudinal direction. The terminal fitting portion 112, the core wire crimping portion 114, and the covering crimping portion 116 of the terminal 130 are formed so as to be separated from each other. The terminal 130 is integrally formed by punching a metal plate such as a copper plate or a tin-plated copper plate, bending it, or the like. Here, a case where the terminal 130 is a female terminal will be described. The terminal 130 may be a male terminal.

  As the metal plate used for the terminal 130, for example, metal plates of various copper alloys such as brass and copper alloy can be used in addition to the copper plate. In addition to tin, various metal platings such as nickel, gold, and silver can be used for plating.

  A male terminal (not shown) is inserted and connected to the terminal fitting portion 112 of the terminal 130 in a fitting manner. Here, it is formed in a cylindrical shape (more specifically, a rectangular tube shape) penetrating along the longitudinal direction of the terminal 130. A contact piece 113 for contacting a male terminal is provided inside the terminal fitting portion 112.

  The proximal end portion of the terminal 130 with respect to the terminal fitting portion 112 is such that the core crimping portion 114 and the covering crimping portion 116 are connected to the terminal 130 from a part of the bottom 118 extending from a part of the terminal fitting portion 112 in the longitudinal direction of the terminal 130. It is formed so as to protrude toward one side orthogonal to the longitudinal direction. More specifically, in a state where the core wire crimping portion 114 and the covering crimping portion 116 are not crimped to the electric wire 120, the end of the electric wire 120 can be disposed from one side (the protruding side of the core wire crimping portion 114 and the covering crimping portion 116). Thus, it is formed in the cross-sectional view substantially U shape which the said one side opens.

  In the terminal-attached electric wire 110, the end portion of the core 120 of the electric wire 120 is disposed between two facing portions of the core wire crimping portion 114 in the bottom portion of the terminal 130, and the covering material 124 is opposed to the covering crimping portion 116. In this state, the core crimping portion 114 is crimped so as to cover the outer periphery of a part of the core wire end portion in the longitudinal direction, and the covering crimping portion 116 is the core wire end side portion of the covering material 124. It is configured to be crimped to. Here, the intermediate portion of the core wire end portion of the electric wire 120 is crimped to the core wire crimping portion 114, and the tip end portion 122 a and the base end portion 122 b are the one side of the bottom portion 118, and the core wire crimping portion in the longitudinal direction of the terminal 130. 114 is exposed to the outside from both sides.

  In addition, the electric wire 110 with a terminal shown in FIG. 1 is an example in which the core wire crimping portion 114 of the terminal 130 is crimped to the core wire end portion exposed by peeling off the covering material 124 at the end portion of the electric wire 120. Although demonstrated, the electric wire with a terminal of the present invention is not restricted to this. For example, the terminal-attached electric wire has a configuration in which the terminal is crimped so as to connect the exposed core wires to the plurality of electric wires in which the covering material 124 is peeled off in the middle in the longitudinal direction and the core wires are exposed. There may be.

  As described above, here, the core wire 121 of the covered electric wire 120 is made of aluminum (aluminum alloy), and the terminal 130 is made of a copper (or copper alloy such as brass, or a tin plating thereof), and between the two metals. Then, the standard electrode potential of the core wire is lower than that of the terminal 130. Thereby, if water (electrolyte aqueous solution) adheres to the contact portion between the core wire crimping portion 114 and the core wire end portion, the core wire exposed portion 122 may be corroded (electric corrosion). Hereinafter, an example in which anticorrosion treatment is performed on the core wire exposed portion 122 will be described on the assumption that the core wire 121 and the terminal 130 have the above relationship.

  The surface of the core wire exposed part 122 is covered with the anticorrosive agent 80 in the coated electric wire 110 with a terminal. The anticorrosive agent 80 reaches every corner of the core wire exposed portion 122 of the terminal-attached electric wire, and also adheres to the core wire crimping portion and the bottom surface of the terminal 130 adjacent thereto. 1 to 3 show the anticorrosive agent 80 as seen through for convenience.

  FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 and shows a portion of the core wire exposed portion 122b. As shown in FIG. 2, the anticorrosive agent 80 at the core wire exposed portion 122 b covers the entire periphery of the core wire 121 without any gaps. FIG. 3 is a cross-sectional view taken along the line BB in FIG. 1 and shows a portion of the core wire exposed portion 122a. As shown in FIG. 3, the anticorrosive agent 80 in the portion of the core wire exposed portion 122 a covers the periphery of the core wire 121 on the core wire exposed portion 122 a side. The core wire exposed portion 122 is completely covered with the anticorrosive agent 80 so that it is not exposed to the outside.

  In the electric wire with terminal 110 shown in FIGS. 1 to 3, the anticorrosive agent 80 covers the upper surface and the side surface of the connecting portion with a predetermined thickness along the shape of the outer periphery of the terminal 130 and the covered electric wire 120. The outside of the bottom surface of the terminal 130 is not covered with the anticorrosive 7 and the metal of the terminal 130 is exposed to the outside.

  The end portion on the terminal 130 side of the covered electric wire 120 is covered so that the anticorrosive agent 80 protrudes slightly from the tip of the core wire 121 to the terminal fitting portion 112 side of the terminal 130. Further, the end portion of the terminal 130 on the side of the covered electric wire 120 is covered so that the anticorrosive agent 80 protrudes slightly toward the covering material 124 side.

  The anticorrosive agent 80 at the connection portion between the core wire 121 and the terminal 130 preferably has a thickness in the range of 0.01 to 3 mm. If the thickness of the anticorrosive agent 80 becomes too thick, application may be difficult. Further, if the thickness of the anticorrosive agent 80 becomes too thin, the anticorrosion performance may be insufficient.

  FIG. 4 is an explanatory view showing a method of applying an anticorrosive to the electric wire with terminal. As shown in FIG. 4, the anticorrosive agent 80 is applied in a state where the terminal 130 is turned upside down and the core wire exposed portion 122 where the core wire of the connecting portion is exposed is directed downward. The anticorrosive agent is brought into contact with the core wire exposed portion 122 and the anticorrosive agent 80 is infiltrated into the core wire exposed portion 122 from below. The anticorrosive agent 80 is applied to the terminal-attached electric wire 110 while being held in a posture in which the core wire exposed portion 122 faces downward.

  As a specific method for applying the anticorrosive to the connecting portion, the method described in Japanese Patent No. 5299210 can be used. Hereinafter, an example of the coating method will be described. As shown in FIG. 4, a device for applying a composition of the anticorrosive agent 80 (hereinafter sometimes referred to as the anticorrosive agent 80) in the vicinity of the contact portion between the core wire exposed portion 122 and the terminal 130 is used. The apparatus shown in FIG. 4 includes a jet part 30 and is formed so that an anticorrosive can be jetted from the jet part.

  The jet part 30 is composed of two nozzles 30a and 30b each having an opening that opens upward. The nozzles 30a and 30b are configured to open upward and be able to guide the anticorrosive agent 80 upward. The nozzle 30a is disposed corresponding to the core wire exposed portion 122a of the terminal-attached electric wire 110. The nozzle 30b is disposed corresponding to the core wire exposed portion 122b on the coated crimping portion 116 side of the electric wire 110 with terminal.

  The jet part 30 immerses the core wire exposed part 122 of the terminal-attached electric wire in the jetted anti-corrosive agent 80, whereby the anticorrosive agent 80 comes into contact with the connection part of the terminal-attached electric wire 110, and the composition of the anticorrosive agent is applied to the core wire exposed part. Applied. When the anticorrosive agent 80 is applied, the anticorrosive agent 80 is preferably applied to the core wire exposed portion 122 and the core wire crimping portion 114 and the bottom portion 118 of the terminal 130 adjacent to the core wire exposed portion 122.

  The jet part 30 includes a jet mechanism part or the like for allowing the anticorrosive agent 80 stored in the anticorrosive tank or the like to jet from the jet part 30 toward the core wire exposed parts 122a and 122b of the terminal-attached electric wire 110. .

  In the method of applying the anticorrosive agent 80 to the terminal-attached electric wire 110, first, the electric wire with terminal 110 is attached and held on a holding member or the like, and the anticorrosive agent 80 is jetted. Next, the core wire exposed portions 122a and 122b of the terminal-attached electric wire 110 are moved to positions facing the jet portions 30a and 30b. The terminal-attached electric wire 110 is moved downward in a direction approaching the jet part 30 from a state where it is maintained at a position separated from the jet part 30. And in the state where the core wire exposed portions 122a and 122b of the terminal-attached electric wire 110 are immersed in the anticorrosive agent 80 jetted from the jet portions 30a and 30b, the movement is stopped, and the terminal-attached electric wire 110 is held at this position. Immerse for about 1.5 to 2 seconds to infiltrate the anticorrosive agent, and apply the anticorrosive agent 80 to the core wire exposed portions 122a and 122b.

  In this state, the terminal-attached electric wire 110 is disposed at a position where the inclined tip portion of the jet portion 30a is disposed in the space between the terminal fitting portion 112 and the core wire exposed portion 122a. And the anticorrosive 80 jetted from the nozzle 30a is bathed in the core line exposed part 122a mainly toward diagonally upward by the inclination shape of the front end side part. Moreover, the anticorrosive agent 80 jetted from the nozzle 30b is poured on the core wire exposed part 122b toward the upper side. Further, the anticorrosive agent 80 jetted from the nozzles 30a and 30b flows in a coupled manner between both the nozzles 30a and 30b, and is also applied to part or all of the exposed surface of the core wire crimping portion 114 of the terminal 130. It is bathed and applied.

  After the electric wire with terminal 110 is immersed in the anticorrosive agent 80, the electric wire with terminal is raised and moved in a direction away from the jet part 30. When the electric wire with terminal 110 is gradually moved away from the jet part 30, the anticorrosive agent 80 jetted from the nozzle 30b and the anticorrosive agent 80 attached to the electric wire with terminal 110 are separated by the action of gravity and surface tension. The anticorrosive 80 jetted from the nozzle 30a and the anticorrosive 80 adhering to the terminal-attached electric wire 110 are separated.

  In general, when the melted anticorrosive agent 80 is applied to the core wire exposed portion 122a with the core wire exposed portion 122 of the electric wire with terminal 110 facing upward (see FIG. 1), the anticorrosion applied to the core wire exposed portion 122a. There is a risk that the agent 80 flows to the terminal fitting part 112 side through the bottom part 118 of the terminal 130. On the other hand, as described above, the core wire exposed portion 122 is applied by applying the anticorrosive 80 jetted to the core wire exposed portion 122a in a posture in which the core wire exposed portion 122 of the electric wire 110 with terminal is directed downward. The anticorrosive agent 80 applied to the inner surface of the core exposed portion 122 is likely to gather on the opposite side of the bottom portion 118, and the anticorrosive agent 80 applied to the terminal fitting portion 112 side can be prevented from flowing in and adhering thereto. .

  However, it has been found that when the above coating method is used, there are the following problems. For example, when the anticorrosive agent 80 is applied from the upper surface side (upper side in the drawing) of the terminal in FIG. 2, the anticorrosive agent 80 contacts and penetrates from the upper 80 b side of the core wire 121. It will be. At this time, if the anticorrosive agent 80 does not sufficiently permeate, the portion may be a gap without penetrating into the portion 80 c below the core wire 121. Further, in the present invention, as shown in FIG. 4, the terminals are inverted, and the anticorrosive agent 80 is applied so that the anticorrosive agent 80 comes into contact with the connecting portion from below the connecting portion, and the anticorrosive agent 80 penetrates into the connecting portion. As a result, a gap is easily formed in the portion 80 c below the core wire 121. If voids are formed in a state where the anticorrosive agent does not penetrate into the portion 80c, corrosion easily proceeds from there.

Therefore, it has been found that the present invention allows the anticorrosive to penetrate reliably by configuring the anticorrosive so that the viscosity, surface tension, and contact angle have the relationship shown in the following (formula 1). .
(Formula 1)
η / (γ · cosθ) ≦ 600
In Equation 1, η is the viscosity (mPa · s), γ is the surface tension (mN / m), and θ is the contact angle (°).

  When η / (γ · cos θ) in Formula 1 is 600 or less, the anticorrosive agent can be sufficiently permeated into the gap between the coating tips of the caulking portions, and moisture can permeate through the gap. It is possible to prevent and exhibit the anticorrosive performance of the anticorrosive. η / (γ · cos θ) is preferably 300 or less from the viewpoint of further infiltrating the anticorrosive agent and exhibiting better anticorrosive performance.

The viscosity η (mPa · s) is a value measured with an E-type viscometer.
The surface tension γ (mN / m) is a value measured by the Wilhelmy method.
The contact angle θ (°) is a value measured by the θ / 2 method.

  In a general application method, when the anticorrosive agent is dropped from above the connecting portion, the anticorrosive agent penetrates by its own weight, and therefore the degree of penetration can be managed only by the viscosity. However, when the anticorrosive agent is jetted from below the connecting portion and brought into contact with the connecting portion as described above, it penetrates from the gaps between the core wires by capillarity. Therefore, if only the viscosity of the anticorrosive agent is defined, it cannot be penetrated well. Therefore, by using the relationship of the above (formula 1), the degree of penetration can be controlled and the anticorrosive can be surely penetrated into a predetermined portion.

  In order to make η / (γ · cos θ) 600 or less in the anticorrosive agent, the resin type, viscosity, etc. may be appropriately selected so as to be within the above range. The type of resin of the anticorrosive agent 80 is not particularly limited as long as it is a material capable of forming an anticorrosive coating film, but it is preferable to use a curable resin composition containing a curable resin that can be cured at room temperature. The curable resin is preferably one capable of applying the anticorrosive agent at room temperature. The anticorrosive is preferably room temperature curable. If the anticorrosive agent can be applied at room temperature, a heating device or the like is unnecessary as compared with a hot-melt resin.

  The curing means for the curable resin is not particularly limited, and various curing means such as a photo-curing type such as ultraviolet curing, a heat curing type, a moisture curing type, and an anaerobic curing type can be used.

  As the anticorrosive agent 80, for example, an acrylic resin, an epoxy resin, a silicone resin, or the like can be used. These various curable resins are used.

  The viscosity η of the anticorrosive agent 80 is not particularly limited, but is preferably 500 (mPa · s) or more because it can be reliably held.

  The method for manufacturing a terminal-attached electric wire according to the present invention uses the above-mentioned anticorrosive agent having a specific property of η / (γ · cosθ) of 600 or less, and when applying the anticorrosive agent, the anticorrosive agent is applied from below the connecting portion. There is a great feature in the point of contact and penetration. In order to manufacture the electric wire 110 with a terminal, the terminal 130 and the covered electric wire 120 are prepared. The covered electric wire 120 peels off the covering material 124 of the terminal to expose the core wire 121 by a predetermined length. Next, the terminal 130 is crimped to the end of the covered electric wire 120 to crimp the core wire crimping portion 114 and the coated crimping portion, and the core wire 121 and the terminal 130 are connected. Next, the composition of the anticorrosive agent 80 is applied to the conductor (core wire 121), the terminal 130, and the core wire exposed portion 122 of the connecting portion, and the anticorrosive agent 80 is cured under predetermined conditions, whereby the electric wire 110 with terminals is obtained.

  As described above, the method of applying the anticorrosive agent 80 to the core wire exposed portion 122 is performed by bringing the anticorrosive agent into contact with the connecting portion from below the connecting portion and allowing the anticorrosive agent to penetrate into the connecting portion. When applying the anticorrosive agent 80, the composition of the anticorrosive agent may be adjusted in temperature by heating, cooling, or the like, but as described above, it is preferably performed at room temperature. For curing the anticorrosive agent 80, for example, a curing device such as an ultraviolet irradiation device or a heating device can be used.

  The terminal-attached electric wire 110 can be used as a wire harness by bundling a single or a plurality of covered electric wires.

Examples of the present invention and comparative examples are shown below.
In Examples 1-1 to 1-5 and Comparative Example 1, a corrosion inhibitor containing an acrylic resin as a curable resin was used. In Examples 2-1 to 2-3 and Comparative Examples 2-1 to 2-3, an anticorrosive containing a silicone resin as a curable resin was used. In Examples 3-1 to 3-5 and Comparative Example 3-1, an anticorrosive agent containing an epoxy resin as a curable resin was used. As shown in Tables 1-3, the viscosity is adjusted by changing the amount of fumed silica (product name “Aerosil” manufactured by Nippon Aerosil Co., Ltd.) as a thickener, and the value of η / (γ · cos θ) To change. Tables 1 to 3 show the type, viscosity, surface tension, contact angle, and η / (γ · cos θ) of the anticorrosive used.

  Using the anticorrosive shown in Tables 1 to 3 above, using the jet device described in Japanese Patent No. 5299910, as shown in FIG. 4, the end of the covered electric wire using an aluminum core wire is made of tin-plated copper plate The anticorrosive agent 80 is jetted from the jet portion 30 to the connecting portion to which the terminal of the anticorrosive terminal is connected, the anticorrosive agent is brought into contact with the connecting portion for 60 seconds, and the anticorrosive agent is infiltrated into the connecting portion, and then the anticorrosive agent is appropriately cured and tested. Created the body. Using the prepared specimen, a salt spray test was performed to evaluate the performance. The evaluation results are shown in Tables 1-3. Details of the anticorrosive, curing conditions, and salt spray test method are as follows.

・ Acrylic resin: TB3062E manufactured by ThreeBond
-Curing conditions for acrylic resin: irradiation intensity 500 mW / cm ² 10 s
・ Silicone resin: Momentive TSE3995
・ Curing condition of silicone resin: Leave at room temperature for 1 week ・ Epoxy resin: TB2280E manufactured by ThreeBond
-Curing conditions for epoxy resin: 120 ° C for 120 minutes

[Salt spray test method]
In the salt spray test, a neutral salt spray test was performed with reference to JISZ2371. The test conditions were a temperature of 35 ° C. and an evaluation time of 240 hours. After the test, the terminal was disassembled, and the appearance of the connection part was visually observed. The case where there was no corrosion of the aluminum and the anticorrosive was sufficiently penetrated to the bottom was judged as excellent (◎), and there was no corrosion of the aluminum. The anticorrosive agent also penetrates to the bottom, but if the gap is partly seen as good (○), the anticorrosive phase penetrates to the bottom, but the gap is partly seen and the corrosion of the aluminum The case where it occurred was regarded as slightly defective (Δ), and the case where corrosion of aluminum occurred and the anticorrosive did not substantially penetrate to the bottom surface was regarded as defective (x).

  As shown in Tables 1 to 3, Examples 1-1 to 1-5, Examples 2-1 to 2-3, and Examples 3-1 to 3-5 are all η / (γ · cos θ). Is 600 or less, the result that salt sprayability was favorable or excellent was obtained. On the other hand, Comparative Examples 1-1, 2-1 to 2-3, and 3-1 all have η / (γ · cos θ) exceeding 600, and the result of the salt spray test is somewhat poor or poor. there were. In addition, as shown in Tables 1 to 3, it can be seen that if only the viscosity is defined, the degree of penetration varies depending on the type of resin and the like, and thus the anticorrosion performance may not always be satisfied. On the other hand, by setting η / (γ · cos θ) to 600 or less, it is possible to maintain the anticorrosion performance even when the type of resin is different.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 30 Jet part 30a Nozzle of jet part 30b Nozzle of jet part 110 Electric wire with terminal 112 Terminal fitting part 113 Contact piece 114 Core wire crimping part 116 Cover crimp part 118 Bottom 120 Covered electric wire 121 Core wire 122 Core wire exposed part 122a Fit of core wire exposed part A portion 122b exposed from the joint portion side A portion 124 exposed from the coating portion side of the core wire exposed portion 124 Coating material 130 Terminal

Claims (4)

An electric wire with a terminal provided with an anticorrosive agent-applied portion in which an anticorrosive agent is applied to a connection portion in which a terminal is connected to an end portion of a covered electric wire whose conductor is covered with an insulator,
Application of the anticorrosive agent is performed by bringing the anticorrosive agent into contact with the connecting portion from below the connecting portion and allowing the anticorrosive agent to penetrate into the connecting portion,
The said anticorrosive agent satisfies the following formula 1, The covered electric wire with a terminal characterized by the above-mentioned.
(Formula 1)
η / (γ · cosθ) ≦ 600
In Equation 1, η is the viscosity (mPa · s), γ is the surface tension (mN / m), and θ is the contact angle (°).   The electric wire with a terminal according to claim 1, wherein the conductor of the covered electric wire is an aluminum-based metal, the terminal fitting is a copper-based metal, and the connecting portion is a dissimilar metal connecting portion. A method of manufacturing a coated electric wire with a terminal comprising an anticorrosive agent coating portion in which an anticorrosive agent is applied to a connection portion in which a terminal is connected to an end portion of a covered electric wire whose conductor is covered with an insulator,
Application of the anticorrosive agent is performed by bringing the anticorrosive agent into contact with the connecting portion from below the connecting portion and allowing the anticorrosive agent to penetrate into the connecting portion,
The said anticorrosive satisfies the following formula 1, The manufacturing method of the covered electric wire with a terminal characterized by the above-mentioned.
(Formula 1)
η / (γ · cosθ) ≦ 600
In Equation 1, η is the viscosity (mPa · s), γ is the surface tension (mN / m), and θ is the contact angle (°).   The method of manufacturing an electric wire with a terminal according to claim 3, wherein the anticorrosive agent uses a curable resin, and the anticorrosive agent is applied at room temperature.

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