JPH10237674A - Plated aluminum electric wire, insulating plated aluminum electric wire and their production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the production of a lightweight plated aluminum electric wire by successively applying an anchor metallic layer by substitution plating and a highly conductive metallic layer by electroplating on the outer circumference of an aluminum material conductor. SOLUTION: On the outer circumference of an aluminum conductor 1 (about 0.5mmϕ), an anchor metallic layer 2 (having about 1μm thickness) is formed by substitution plating. Next, on the anchor metallic layer 2, a strike plating layer 3a (having about 2μm thickness) and a thick plating layer 3b (having about 7μm thickness) are successively formed by electroplating, and a highly conductive metallic layer 3 is applied to produce a plated aluminum electric wire 10. Moreover, as the anchor metallic layer 2, zinc, nickel, copper, gold, silver or alloys consisting essentially of them is used, and as the highly conductive metallic layer 3, copper, gold, silver, nickel, solder or alloys consisting essentially of them is used. Furthermore, the cross-sectional area ratio of the aluminum conductor 1 to the plated aluminum electric wire 10 is regulated to >=85%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plated aluminum electric wire, an insulated plated aluminum electric wire, and a method for producing the same. More specifically, the present invention relates to a plated aluminum electric wire, an insulated plated aluminum electric wire, and a method for producing the same, which are used as wiring materials for electronic device parts such as coils.

[0002]

2. Description of the Related Art In recent years, as electronic devices have become smaller and lighter, there has been an increasing demand for weight reduction of wiring materials such as coils mounted thereon. In order to meet these requirements, a low density aluminum core (hereinafter abbreviated as an aluminum core) is used as a base material at the center of a general wire formed from a copper conductor, and the outer periphery is coated with copper to form. Known copper-clad aluminum wires (hereinafter abbreviated as copper-clad aluminum wires) are known.

[0003]

However, the copper-clad aluminum wire produced by the above-mentioned manufacturing method requires a copper tape to be sewn by welding, so that the tape itself needs to have a certain thickness. Therefore, to reduce the weight,
There is a natural limitation in increasing the cross-sectional area ratio of the aluminum core to the copper-clad aluminum wire, and the processing limit is about 8
5%. For this reason, there is a problem that further weight reduction cannot be achieved.

The present invention has been made to solve the above-mentioned various problems of the prior art, and an object of the present invention is to provide a plated aluminum electric wire, an insulated plated aluminum electric wire, and a method of manufacturing the same, which can reduce the weight. I do.

[0006]

According to a first aspect of the present invention, there is provided a plating method comprising providing an anchor metal layer formed by sequential displacement plating and a good conductive metal layer formed by electroplating on the outer periphery of an aluminum conductor or an aluminum alloy conductor. Located on aluminum wires.

As a second aspect, the present invention resides in a plated aluminum electric wire having a cross-sectional area ratio of an aluminum conductor or an aluminum alloy conductor to a plated aluminum electric wire of 85% or more.

According to a third aspect of the present invention, there is provided a plated aluminum electric wire in which the anchor metal layer is zinc, nickel, copper, gold, silver or an alloy containing these as a main component.

According to a fourth aspect of the present invention, there is provided a plated aluminum electric wire in which the good conductive metal layer is made of copper, gold, silver, nickel, solder or an alloy containing these as a main component.

[0010] As a fifth aspect, the present invention resides in an insulated plated aluminum electric wire further provided with an insulating coating layer on the outer periphery of the plated aluminum electric wire.

According to a sixth aspect of the present invention, there is provided a method for producing a plated aluminum electric wire, comprising: a degreasing step for removing oil from the surface of an aluminum conductor or an aluminum alloy conductor; A film removing step, an anchor metal layer forming step of applying displacement plating to the aluminum conductor or aluminum alloy conductor after the step to form an anchor metal layer, and forming a good conductive metal layer by electroplating on the outer periphery of the anchor metal layer A method of forming a plated aluminum wire by forming a plated aluminum wire base material through a good conductive metal layer forming step, and then drawing the wire base material to a predetermined diameter by a wire drawing process. is there.

According to a seventh aspect of the present invention, there is provided a method for manufacturing an insulated plated aluminum wire, comprising the steps of: applying an insulating paint to an outer periphery of the plated aluminum wire after the wire drawing step; The present invention relates to a method for manufacturing an insulated plated aluminum electric wire to be an insulated plated aluminum electric wire.

[0013]

In the plated aluminum electric wire according to the first aspect of the present invention, an anchor metal layer 2 formed by substitution plating and a good conductive metal layer 3 formed by electroplating are sequentially provided on the outer periphery of an aluminum conductor 1. The good conductive metal layer 4 can be formed thin by plating.

The plated aluminum electric wire according to the second aspect of the present invention is reduced in weight because the sectional area ratio of the aluminum conductor or the aluminum alloy conductor to the plated aluminum electric wire is 85% or more.

[0015] In a plated aluminum electric wire according to a third aspect of the present invention, the anchor metal layer is formed of zinc, nickel, copper, or copper.
It can be preferably formed of gold, silver or an alloy containing these as main components.

In the plated aluminum wire according to the fourth aspect of the present invention, the good conductive metal layer can be preferably formed of copper, gold, silver, nickel, solder or an alloy containing these as main components.

The plated aluminum electric wire according to the fifth aspect of the present invention can be wound around a coil or the like since an insulating coating layer is further provided on the outer periphery of the plated aluminum electric wire.

A method of manufacturing a plated aluminum electric wire according to a sixth aspect of the present invention includes a pre-plating treatment step, a displacement plating step of performing displacement plating to form an anchor metal layer, and forming a good conductive metal layer by electroplating. By performing the good conductive metal layer forming step, a plated aluminum electric wire can be easily manufactured. At this time, the plating thickness of the low thermal conductivity metal layer and the good conductive metal layer such as copper can be adjusted to a desired thickness by controlling the electroplating conditions. Therefore, the ratio of the cross-sectional area of the aluminum conductor to the plated aluminum electric wire is 85%.
% Is easily possible, which is preferable for weight reduction. Further, in the manufacturing method of the present invention, the natural oxide film on the surface of the aluminum conductor is removed and activated, and the outermost surface can be changed to a dissimilar metal by displacement plating utilizing a potential difference. Therefore, a good conductive metal layer with good adhesion can be easily manufactured by electroplating.

The plated aluminum electric wire according to the seventh aspect of the present invention is obtained by applying an insulating coating to the outer periphery of the plated aluminum electric wire having a predetermined diameter obtained according to the fifth aspect and baking it. Aluminum wires can be easily manufactured.

[0020]

The present invention will be further described with reference to the following examples. Note that the present invention is not limited by this. FIG. 1 is a sectional view showing one embodiment of a plated aluminum wire of the present invention, FIG. 2 is a sectional view showing one embodiment of an insulated plated aluminum wire of the present invention, and FIG. 3 is a plated aluminum wire and insulated plating of the present invention. It is a flowchart which shows one Example of the manufacturing method of an aluminum electric wire. In these figures, 1 is an aluminum conductor, 2 is an anchor metal layer, 3
Is a good conductive metal layer, 3a is a strike plating layer, 3b is a thick plating layer, 4 is an insulating coating layer, 10 is a plated aluminum wire, and 20 is an insulated plated aluminum wire.

Embodiment 1 Embodiment 1 will be described with reference to FIG. 1 and FIG.
A 0.5 mmφ aluminum alloy wire was used as the aluminum conductor (base material) (1). First, in the degreasing step F1, the aluminum conductor base material (1) is immersed in a 30% KOH aqueous solution at 60 ° C.
Electric current was applied for 20 seconds under the condition of 10 A / dm ² to remove fats and oils on the surface.

Subsequently, in the oxide film removing step F2, the aluminum conductor base material (1) after the above-mentioned step was immersed in a 300 g / l NaOH aqueous solution at room temperature for 15 seconds to remove the natural oxide film, and then an additional 50% The surface was activated by immersion in an aqueous HNO ₃ solution for 15 seconds at room temperature.

Subsequently, in an anchor metal layer forming step F3 by displacement plating, 25 g / l ZnO and 170 g / l
Is immersed in a zinc displacement plating bath made of NaOH at room temperature for 30 seconds to form a zinc film on the surface. Here, in order to form the obtained film more densely and strengthen the adhesion, the zinc film was removed by immersion in an HNO ₃ aqueous solution again, and then immersed again in the zinc displacement plating bath at room temperature for 20 seconds, 1μm thick dense galvanized anchor metal layer
(2) was obtained.

Subsequently, in a good conductive metal layer forming step F4 by electroplating, first, CuSO ₄ .5H ₂ O 75 g /
1 and H ₂ SO _{4 at} 200 g / l were passed through a 30 ° C. strike copper plating bath at 4 A / dm ² for 2 minutes to obtain a 2 μm thick strike copper plating layer (3a). Further, CuSO is formed on the outer periphery of the strike copper plating layer (3a).
₄ · 5H ₂ O 220g / l and H ₂ SO ₄ 50g / l
And a thick copper plating layer having a thickness of 7 μm by applying a current to the thick copper plating bath of 30 ° C. at 10 A / dm ² for 3 minutes.
b) to provide a plated aluminum wire base material (10a) provided with a good conductive metal layer 3.

Subsequently, as a wire drawing step F5, the wire base material (10a) was cold drawn to produce a 0.15 mmφ plated aluminum wire (10). The calculated cross-sectional area ratio of the aluminum conductor (1) to the plated aluminum electric wire (10) was about 97%.

Embodiment 2 Embodiment 2 will be described with reference to FIGS. The 0.15 mmφ plated aluminum wire (1
0), in the insulating coating step F6, a polyurethane insulating coating is applied to the outer periphery of the plated aluminum wire (10) and baked to form a 5 μm thick polyurethane insulating coating (5).
To produce an insulated plated aluminum electric wire (20) having a finish outer diameter of 0.16 mm.

[0027]

According to the plated aluminum electric wire, the insulated plated aluminum electric wire and the method for producing them according to the present invention, the good conductive metal layer can be formed to a desired thickness by electroplating. An extremely lightweight wire can be obtained. Further, since the coiled wire can be formed by applying and baking an insulating coating layer on the surface of the plated aluminum electric wire having the above structure, it is extremely useful for reducing the weight of electronic device parts.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a plated aluminum electric wire of the present invention.

FIG. 2 is a cross-sectional view showing one embodiment of the insulated aluminum wire of the present invention.

FIG. 3 is a flowchart showing one embodiment of a method for producing a plated aluminum wire and an insulated plated aluminum wire according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aluminum conductor 2 Anchor metal layer 3 Good conductive metal layer 3a Strike plating layer 3b Thick plating layer 4 Insulation coating layer 10 Plating aluminum wire 20 Insulation plating aluminum wire

Claims (7)

[Claims] 1. A plated aluminum electric wire comprising an aluminum conductor or an aluminum alloy conductor and an anchor metal layer formed by sequential plating and a good conductive metal layer formed by electroplating on the outer periphery of the aluminum conductor or aluminum alloy conductor. 2. The sectional area ratio of an aluminum conductor or an aluminum alloy conductor to a plated aluminum electric wire is 8
The plated aluminum electric wire according to claim 1, wherein the content is 5% or more. 3. The plated aluminum electric wire according to claim 1, wherein the anchor metal layer is made of zinc, nickel, copper, gold, silver or an alloy containing these as a main component. 4. The plated aluminum electric wire according to claim 1, wherein the good conductive metal layer is made of copper, gold, silver, nickel, solder or an alloy containing these as a main component. 5. An insulated plated aluminum electric wire, further comprising an insulating coating layer provided on the outer periphery of the plated aluminum electric wire according to claim 1, 2, 3 or 4. 6. The method for producing a plated aluminum electric wire according to claim 1, wherein a degreasing step of removing oil from the surface of the aluminum conductor or the aluminum alloy conductor;
An oxide film removing step of removing the natural oxide film following the step, an anchor metal layer forming step of forming an anchor metal layer by subjecting the aluminum conductor or the aluminum alloy conductor after the step to displacement plating, and an outer periphery of the anchor metal layer Forming a highly conductive metal layer by electroplating on the aluminum substrate to form a plated aluminum wire base through a step of forming a well-conductive metal layer, and then drawing the wire base material to a predetermined diameter by a wire drawing process and plating. A method for producing a plated aluminum electric wire, which is an aluminum electric wire. 7. The method for manufacturing an insulated plated aluminum wire according to claim 5, wherein an insulating paint is further applied to the outer periphery of the plated aluminum wire after the wire drawing process according to claim 6 and baked. A method for producing an insulated plated aluminum electric wire, which comprises forming an insulated plated aluminum electric wire by a coating process.