WO2004016832A1

WO2004016832A1 - Electrode for electroplating

Info

Publication number: WO2004016832A1
Application number: PCT/JP2003/010289
Authority: WO
Inventors: Michiaki Saito; Nobuo Nishi
Original assignee: Sumitomo Shoji Plastics Co., Ltd.
Priority date: 2002-08-13
Filing date: 2003-08-13
Publication date: 2004-02-26
Also published as: JP2004076050A; JP4105502B2; AU2003262233A1

Abstract

An electrode for electroplating comprises long carbon fibers (11), a conductive clamping member (13) for clamping the upper ends of the carbon fibers via a soft metal (12), a first bag body (14) made of cloth or net and covering and shielding the carbon fibers, and a second bag body (15) made of cloth or net and covering and shielding the first bag body. Accordingly, the shape of the electrode can be freely changed according to a complicated shape of an ocject to be treated; a voltage drop in the longitudinal direction can be suppressed; and elution of the constituent metal or adhesion of the sludge can be prevented.

Description

Description Electrode for electrical plating Technical field

TECHNICAL FIELD The present invention relates to an electrode for electric plating which is effective when an inner or outer surface having a complicated shape or a large or long object is electrically plated with metal. Revival technology

Electrodes that are generally used as anodes for electric plating include: 1) sufficient electrical conductivity to maintain a uniform current distribution throughout the electrode, and 2) not being subjected to chemical erosion by the plating bath. In addition to having the characteristics described above, ③ it is required to have flexibility to handle workpieces with complicated shapes.

Conventionally, metal fibers such as stainless steel have been mainly used as flexible electrodes. Carbonaceous materials are widely used because of their excellent electrical conductivity and chemical stability.

In addition, carbon fiber (carbon fiber) is considered to be used as an electrode for electric plating because of its excellent electrical properties, chemical stability, and mechanical properties. Electromechanical electrodes tied together in a bundle have also been proposed. However, when metal fibers such as stainless steel are used in the above-described conventional electrodes for electric plating, the voltage drop in the length direction of the electrodes is remarkable, and phenomena such as elution of metal constituting the electrodes or adhesion of sludge are caused. And there were problems in electrical characteristics and corrosion resistance.

Also, when a carbonaceous material was used, it was not possible to cope with a workpiece having a complicated shape due to lack of flexibility.

In the above-mentioned electrode for electric plating using carbon fiber, carbon fiber was originally developed as a composite material with synthetic resin, and exhibits various physical properties for the first time when used as a composite material When used as a force electrode, the electrical resistance increased, and there was a problem with the connection between the conductor and the terminal. Also, There was a drawback that the dust in the treatment liquid was entangled with the fine carbon fibers and adhered to the surface, increasing the surface resistance and decreasing the electrical conductivity. Further, dust easily adheres to the portion where the carbon fiber is tied, and the dust once adhered cannot be easily removed. This is because carbon fibers are so thin that they cannot exert great stress during cleaning. Furthermore, when carbon fibers are bound and bound in the circumferential direction as in the past, the electrode is repeatedly bent due to the vibration of the device and the shake of the solution due to the insertion and removal of the workpiece, and the fiber on the outer surface with respect to the center of the electrode is However, the fiber was repeatedly subjected to tensile and compressive stresses, causing slippage between the fibers, causing the fibers to break.

In addition, tying in the circumferential direction itself resulted in locally applying a bending load to the fiber. These phenomena increase as the binding becomes tighter, the binding pitch becomes smaller, and the length becomes longer. It should be noted that the strength of binding the carbon fiber will be shifted in the axial direction unless it is bound to a certain extent.

Furthermore, since there is almost no gap between the carbon fibers in the portion bound in the circumferential direction, the contact area between the treatment liquid and the carbon fibers is reduced, and the current-carrying performance is significantly reduced. Also, the cooling effect of the processing liquid was reduced, and when a large current was applied, heat was generated, and there was a possibility that the electric resistance increased.

The present invention has been proposed in view of the above circumstances, and can be freely deformed in accordance with the complicated shape of an object to be processed, and at the same time, a voltage drop in a length direction, elution of constituent metals or a phenomenon of sludge adhesion. It is an object of the present invention to provide an electrode for electric plating that does not cause any problem. Disclosure of the invention

The present invention provides an electric plating electrode, comprising: a long carbon fiber; a conductive clamp member for clamping an upper end of the carbon fiber via a soft metal; and a cloth or a net surrounding the outside of the carbon fiber. And a first bag configured.

Further, the electrode for electric plating of the present invention includes a second bag made of a cloth or a net that is coarser than the first bag, further surrounding the outside of the first bag. .

In addition, the long carbon fiber includes a one-way woven fabric. Further, the soft metal is formed by a pair of plates provided with the convex curved surfaces facing each other. Clamping the carbon fibers between the plates.

Further, the soft metal includes a plurality of wires or a plurality of pipe materials. Further, the soft metal includes lead or copper.

Further, the periphery of the conductive clamp member is sealed with a synthetic resin or soft rubber.

In addition, a lower end of the first bag is configured to be openable and closable by a string, and a lower end of the second bag is configured to be openable and closable by a string.

As described above, the electrode for electric plating according to the present invention includes a long carbon fiber, a conductive clamp member that clamps the upper end of the carbon fiber via a soft metal, and surrounds the outside of the carbon fiber. With the configuration including the first bag made of cloth or net, it is not necessary to tie the carbon fiber in the circumferential direction, so that the carbon fiber can be prevented from being broken by an external force, and However, the carbon fiber and the treatment liquid can be uniformly contacted in the longitudinal direction, and there is no unevenness in the current supply. Further, since the carbon fibers are surrounded by the first bag, it is possible to prevent dust in the treatment liquid from adhering to the carbon fiber surfaces and to prevent an increase in electric resistance. Further, since the electrode of the present invention has a possibility, the electrode can be freely deformed corresponding to a complicated shape of an object to be processed, and a voltage drop in a length direction can be reduced.

Other objects and other features of the present invention will become apparent from the following detailed description based on the accompanying drawings. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a partially omitted front view showing an example of an electric plating electrode according to the present invention.

FIG. 2 is a side view in which a part of the electrical connection electrode of FIG. 1 is omitted.

FIG. 3 is an enlarged sectional view of a main part of the electrode for electric plating of FIG. 1.

FIG. 4 is an enlarged sectional view of a main part showing another embodiment of the electrode for electric plating of the present invention.

FIG. 5 (a) is a cross-sectional view showing the conductive clamp member of the electrode for electric plating of the present invention, and FIG. 5 (b) is a stack of carbon fiber woven fabrics each having "!" An example FIG.

FIG. 6 (a) is a cross-sectional view showing an example of the reinforcement of the electrode for electric plating of the present invention, and FIG. 6 (b) shows an example of reinforcement of the electrode for electric plating of FIG. 6 (a). It is a principal part front view.

FIG. 7 (a) is a cross-sectional view showing a reinforced example of the electric plating electrode of the present invention, and FIG. 7 (b) shows a reinforced example of the electric plating electrode of FIG. 7 (a). It is a principal part front view.

FIG. 8 is a front view of a main part showing another embodiment of the electric plating electrode of the present invention.

FIG. 9 is an enlarged front view of a portion A in FIG.

FIG. 10 is a front view of an essential part showing another embodiment of the electric makeup electrode of the present invention.

FIG. 11 is an experimental example showing a comparison between the electric plating electrode of the present invention and a conventional voltage. BEST MODE FOR CARRYING OUT THE INVENTION

The electrode for electric plating according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view, partially omitted, showing an example of an electric plating electrode according to the present invention, FIG. 2 is a side view, partially omitted, of the electric plating electrode of the present invention, and FIG. It is a principal part expanded sectional view of the electrode for electric plating of this invention.

The electrode for electric plating 10 includes a long carbon fiber 11, a conductive clamp member 13 for clamping the upper end 11 a of the carbon fiber 11 via a soft metal 12, and the carbon fiber 1. (1) a first bag body (14) made of cloth or net surrounding the outside of the first bag (14), and a second bag body made of cloth or net further surrounding the outside of the first bag body (14) 15 is provided.

Conductive clamping member 1 3, a terminal plate 1 3 a conductive with fixing holes 1 6, the fixing member ¹ 3 b and two terminal plates 1 having an open lower end and the terminal plate 1 3 _a facing the side surface It is composed of a plurality of fixed ports 17 for fixing 3a and 13b at predetermined intervals. As shown in FIG. 3, between the two terminal plates 13a and 13b, curved convex surfaces are disposed so as to oppose each other, and a pair of carbon fibers 12 are sandwiched between the convex surfaces. A soft metal 12 consisting of a plate is interposed, and a plurality of fixing bolts penetrate. Therefore, by tightening the fixed port 17, the upper end 11 a of the carbon fiber 11 sandwiched between the soft metals 12 is pressed by a force 《a good electrical continuity with the conductive clamp member 13 is obtained. Can be As the soft metal 12, a metal such as lead or copper can be suitably used.

As described above, when the soft metal 12 is configured to have a gentle convex curved surface facing each other, the pressing force can be dispersed at the contact portion between the conductive clamp member 13 and the carbon fiber 11, and the carbon fiber 11 Breakage can be prevented and reliable contact can be obtained. Also, since it is fixed by the fixing bolts 17, it is easy to install and remove, and the exchange work is easy.

Further, the soft metal 12 may be composed of a plurality of wires or pipe materials 18 according to the amount of electricity as shown in FIG. When the soft metal 12 is composed of a plurality of wires or pipe members 18 as described above, the structure of the soft metal 12 can be simplified and can be manufactured at low cost.

The carbon fibers 11 used in the present invention are made of carbonaceous fiber tows produced by firing and carbonizing organic synthetic fibers of acrylic or rayon type. The carbon fiber 11 is cut into arbitrary lengths according to the shape of the material to be processed, and is desirably cut with a light twist or lightly knitted to avoid dispersal and clutter of the single fibers. To form a string. At this time, twisting or knitting too strongly is not preferable because it promotes internal heat generation of the electrode. Also, by connecting a plurality of string-shaped electrodes to a single conductive clamp member 13, an octopus-shaped branch electrode can be formed. In particular, in the case of treating a complex object to be treated, the carbon fiber 11 can be inserted into a porous tube made of a soft synthetic resin having electrical insulating properties or a cloth bag made of glass fiber to form an electrode. Furthermore, a string of a soft synthetic resin or glass fiber can be spirally wound around the electrode to prevent contact between the electrode and the electrode.

The first bag body 14 is made of a cloth or net made of polyethylene, polyester, Teflon (registered trademark) or the like having acid resistance, alkali resistance, and chemical properties. The upper end is sandwiched by the conductive clamp member 13 together with the carbon fiber 11. In addition, the lower end of the first bag body 14 is configured to be openable and closable, and is bound by, for example, a string 19. The second bag 15 is made of a cloth or a net having acid resistance, alkali resistance, and chemical resistance similarly to the first bag 14, and the upper end is formed of the conductive clamp member 13. It is fixed to the outer periphery by a fixing member 20. The lower end of the second bag 15 is also configured to be openable and closable. Further, the second bag body 15 is made of a cloth or a net that is coarser than the first bag body 14, and a fixing cord 22 is attached at an appropriate position, so that the fixing It can be tied to the material.

By attaching the weight 23 to the lower end of the second bag 15, the electrode for electric plating 10 can be stabilized in the processing tank. The periphery of the conductive clamp member 13 is sealed with a synthetic resin or a soft rubber 24. By sealing the periphery of the conductive clamp member 13 with these materials, corrosion by the processing liquid can be prevented.

The carbon fiber 11 used in the present invention is a tow (tows) composed of a bundle of a large number of single fibers having a diameter of several microns, and has a significantly larger surface area than a conventional electrode. Therefore, the electrolysis efficiency during plating is extremely high.

—For example, using the tow-shaped carbon fiber as an electrode, a copper-tin-nickel alloy plating solution, voltage 3 V, current density 2.5 AZ 1 O dm ² , bath temperature 20 degrees, time 2 minutes, Plated with PH 8.5. As a result of the stamping under the above standard conditions, good results were obtained.

It has been experimentally confirmed that the electric plating electrode configured as described above has a small voltage drop in the length direction and a substantially uniform current distribution over the whole. It is presumed that the reason depends on the graphite crystal orientation of the carbon fibers constituting the electrode. In other words, it is considered that graphite crystallites are oriented parallel to the fiber axis direction in the process of calcining and carbonizing the raw yarn, and the electrical conductivity in the length direction is significantly improved. This orderly crystal orientation is promoted by heat treatment while applying tension to the yarn.

FIG. 5 shows another embodiment of the electrode of the present invention. FIG. 5 (a) is a cross-sectional view showing a conductive clamp member of the electrode for electric plating of the present invention. b) is FIG. 3 is a plan view showing an example in which one to four woven fabrics (carbon cloths) made of carbon fibers are stacked. Woven fabric (carbon cloth) 25 is a belt-shaped woven fabric using carbon fibers as the warp and synthetic fibers such as polyethylene for the weft. Further, a woven cloth 25 may be used by laminating a required number of these carbon cloths.

In the case of the above configuration, the carbon powder is more flexible than electrodes sintered with carbon powder, so the broken or worn carbon powder is dispersed in the processing solution, which adversely affects the finish of the product There is no fear. In addition, because it is flexible, it can be transported and stored in a wound state, so that it is easy to handle.

Depending on the conditions of use, only the first bag 14 is sufficient and can be used as an electrode for electric plating.

FIG. 6 shows another embodiment of the electrode of the present invention. FIG. 6 (a) is a cross-sectional view showing an example of a reinforced electrode for electric plating of the present invention, and FIG. FIG. 3 is a front view of a main part showing an example in which the electrode for electric plating of the present invention is reinforced. In the present embodiment, the reinforcing material 26 in the form of a nip is arranged along the woven fabric 25 and is fixed by a fixing member 27 at an appropriate position. With this configuration, it is possible to prevent the electrode for electric plating from being carelessly deformed in the processing liquid.

FIG. 7 shows another embodiment of the electrode of the present invention. FIG. 7 (a) is a cross-sectional view showing an example of a reinforced electrode for electric plating of the present invention, and FIG. FIG. 3 is a front view of a main part showing an example in which the electrode for electric plating of the present invention is reinforced. In the present embodiment, the reinforcing material 28 in the form of a tube is arranged along the woven fabric 25 and is fixed by the fixing cord 29 at an appropriate position. With this configuration, it is possible to prevent the electrode for electric plating from being carelessly deformed in the processing liquid.

FIG. 8 is a main part front view showing another embodiment of the electrode of the present invention. In the present embodiment, a metal plating 30 is applied to the upper end 11 a of the carbon fiber 11. As shown in an enlarged view in FIG. 9, a metal plating is performed on a portion of the upper end portion of the carbon fiber 11 where the conductive clamp member 13 is to be attached.

With such a configuration, the electrical contact between the conductive clamp member 13 for supplying current and the carbon fiber 11 is improved, and the conductivity at the connection portion can be significantly improved. FIG. 10 is a front view of an essential part showing another embodiment of the electric makeup electrode of the present invention. In the present embodiment, the metal plating 30 is applied to the upper end 11 a of the carbon fiber 11, and the metal plating 30 is simultaneously applied to the conductive clamp member 31. With this configuration, the contact between the upper end 11a of the carbon fiber 11 and the conductive clamp member 31 can be further improved.

FIG. 11 is an experimental example showing a comparison between the electric plating electrode of the present invention and a conventional voltage. The example shown by the solid line as S-1 is the electrode for electric plating according to the present invention. No abnormality is observed even when a voltage of 5 V to 15 V is applied, and even when a voltage of 15 V or more is applied. There was a proportional increase in current. In contrast, the electrode connected to the conventional pressure terminal shown by the broken line emitted smoke when a voltage of 12 to 15 V was applied. Also, even if the same voltage is applied to the conductive clamp member having a large contact resistance, the current flowing through the electrode is extremely small.

As described above, in the present invention, the contact resistance between the conductive clamp member and the carbon fiber is small, and a current proportional to the voltage applied to the conductive clamp member flows. Also, even if the applied voltage is 12 to 15 V, there is no possibility that a smoke phenomenon occurs at the connection portion. On the other hand, the conventional electrode generated smoke and was not usable. Industrial applicability

As described above, the electrode for electric plating according to the present invention includes a long carbon fiber, a conductive clamp member that clamps the upper end of the carbon fiber via a soft metal, and surrounds the outside of the carbon fiber. And a first bag made of cloth or net. With such a configuration, it is not necessary to bind the carbon fibers in the circumferential direction, so that the carbon fibers can be prevented from being broken by an external force. In addition, the carbon fiber and the treatment can be uniformly contacted in the longitudinal direction, and there is no unevenness in current supply. Further, since the carbon fibers are surrounded by the first bag, it is possible to prevent dust in the treatment liquid from adhering to the carbon fiber surface and to prevent an increase in electric resistance. In addition, the object can be freely deformed in accordance with the complicated shape of the object to be processed, and the voltage drop in the length direction can be reduced.

The electrode of the present invention is constituted by a cloth or a net further enclosing the outside of the first bag body. Since the second bag body is provided, the first bag body and the second bag body can prevent dust in the treatment liquid from adhering to the carbon fiber surface, thereby preventing an increase in electric resistance. In addition, the workpiece can be freely deformed in accordance with the complicated shape of the workpiece, and the voltage drop in the length direction can be reduced.

Further, since the second bag is made of a cloth or a net that is coarser than the first bag, the outer second bag is clogged first by dust in the processing liquid. Can be prevented.

Moreover, since the electrode of the present invention is composed of a pair of unidirectional woven fabrics, the carbon fiber is rich in flexibility and does not bend or wear.

Further, in the electrode of the present invention, the soft metal clamps the carbon fiber between the opposing gentle convex curved surfaces, so that the pressing force at the holding portion is dispersed to prevent the carbon fiber from breaking. can do.

Further, when the soft metal is constituted by a plurality of wires or a plurality of pipe materials, the structure is simple and the carbon fibers can be reliably held according to the amount of electricity. Further, when the soft metal is made of lead or copper, it is possible to prevent the carbon fiber from breaking while maintaining the electrical conductivity with the conductive clamp member. Further, since the periphery of the conductive clamp member is sealed with a synthetic resin or soft rubber, it is possible to prevent the conductive clamp member itself from being corroded by the processing liquid.

In addition, since the lower end of the first bag is configured to be opened and closed by a string, when the first bag is clogged or contaminated by dust or the like, the lower end of the bag is opened and fresh water is blown into the bag. It can be easily removed by washing and the normal filter function can be restored. In addition, maintenance and inspection of carbon fiber can be carried out directly. Further, since the lower end of the second bag is configured to be openable and closable by a string, when the bag is clogged or contaminated with dust or the like, the lower end of the bag is opened and fresh water is blown into the bag. Normal filter function can be easily restored by washing.Carbon fiber maintenance and inspection can be performed directly by opening the bag.

Claims

The scope of the claims

1. A long bag made of a long carbon fiber, a conductive clamp member for clamping an upper end of the carbon fiber via a soft metal, and a cloth or a net surrounding the outside of the carbon fiber. And an electrode for electric plating.

2. The electrode according to claim 1, further comprising a second bag formed of a cloth or a net further enclosing the outside of the first bag.

3. The electrode according to claim 2, wherein the second bag is made of a cloth or a net that is coarser than the first bag.

4. The electrode according to claim 1, wherein the long carbon fiber is formed of a unidirectional woven fabric.

5. The electrode according to claim 1, wherein the soft metal comprises a pair of plates having convex curved surfaces facing each other.

6. The electrode according to claim 1, wherein the soft metal is a plurality of wires.

7. The electrode according to claim 1, wherein the soft metal is a plurality of pipe members.

8. The electrode according to any one of claims 1 to 4, wherein the soft metal is lead. '

9. The electrode for electric plating according to any one of claims 1 to 4, wherein the soft metal is copper.

10. The electrode according to claim 1, wherein the periphery of the conductive clamp member is sealed with a synthetic resin or soft rubber.

11. The electrode according to claim 1, wherein a lower end portion of the first bag body is configured to be opened and closed by a cord.

12. The electrode according to claim 2, wherein a lower end of the second bag is configured to be opened and closed by a cord.