JP2001200397A - Electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely deposit a sufficient amount of a conductive active material layer of a lead dioxide system on an electrode base material and eventually provide an electrode having high performance and long life. SOLUTION: According to the structure of the electrode 201, even if trouble, such as consumption or damage, occurs in part of electrode segments 211 and 250 by the use of the electrode segments 211 and 250, repair may be easily carried out simply by exchanging only the electrode segments 211 and 250 having the trouble. On the other hand, a net like corrosion resistant base material is used as the base material (electrode base material) of the electrode segments 211 and 250 and since the conductive active material layer composed mainly of the lead dioxide is deposited in the wire-shaped segment forming their mesh, the deposition area per unit weight of the conductive active material increases and eventually the adhesive strength of the conductive active material to the electrode base material may be increased. As a result, the peeling, dislodgment, etc., of the conductive active material during the treatment, such as plating, hardly occurs. Since the deposition amount of the conductive active material layer to the base material surface may be made relatively larger, the electrode life may be extended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode used for applying plating or other electrochemical treatment to a member.

[0002]

2. Description of the Related Art Conventionally, in a technique for plating a steel sheet with a metal such as Zn or Cr, a discharge surface is formed by covering the surface of an electrode substrate with a conductive active material layer mainly composed of insoluble lead dioxide. An electrode having the above structure is used. As the conductive active material layer, a layer mainly composed of Pt can be used, but a layer mainly composed of lead dioxide can exhibit plating performance comparable to that of Pt and is inexpensive. In the case of Cr plating, trivalent chromium is used. Is highly oxidizable to hexavalent chromium, which is advantageous for performing good Cr plating.

[0003]

However, since the lead oxide-based conductive active material layer is mainly composed of a brittle oxide, the following problems are likely to occur. Low adhesion to electrode substrate
If it falls off, for example, when it gets caught between the member to be processed and the feed roll, the member to be processed is likely to have a defect such as a press scratch. When using a plate-shaped electrode substrate, the amount of the conductive active material layer carried on the substrate surface cannot be so large,
The electrode life tends to be short. Moreover, if the local consumption of the conductive active material layer becomes severe, the entire electrode must be replaced even if the consumption of the discharge surface that contributes to plating does not progress so much, which is extremely uneconomical. As a structure to attach the electrode segment to the electrode base,
In many cases, a mounting screw is penetrated from the surface of the plate-shaped segment, that is, from the conductive active material layer side, and is screwed into the electrode substrate. In the case of this structure, since the head of the mounting screw is exposed on the surface of the electrode substrate, there is a concern that the plating current or the like may become non-uniform. In addition, there is a disadvantage that the conductive active material layer is easily peeled off when the seating surface of the screw head bites. Further, in order to reduce the cost, an attempt is made to adopt an electrode base structure in which the mounting base is covered with an inexpensive steel core with a lining of Ti, Nb, Ta or the like. There is a problem that the structure near the mounting screw portion formed on the base side tends to be complicated, and that the sealing structure by the lining is easily broken during repeated attachment and detachment.

[0004] It is an object of the present invention to provide a high-performance, long-life electrode capable of firmly supporting a sufficient amount of a lead dioxide-based conductive active material layer on an electrode substrate. Another object of the present invention is to provide an electrode having a structure in which an electrode segment is easily attached to and detached from an electrode base and is easily attached and detached, and furthermore, the attachment and detachment do not easily damage the conductive active material layer.

[0005]

Means for Solving the Problems and Functions / Effects A first structure of the electrode according to the present invention is that the electrode facing the member to be processed is a front side, and an electrode having a liquid circulating portion from the front side to the back side is formed. The base and the electrode base are each removably attached, and a net-like corrosion-resistant base made of a corrosion-resistant metal mainly composed of any of Ti, Nb, and Ta, and all or a part of a plurality of formed meshes are provided. To the extent that the penetrating state is maintained, the reticulated corrosion-resistant substrate has a structure in which a linear active part forming a mesh of the mesh supports a conductive active material layer mainly composed of lead dioxide, and one surface faces the object to be plated. A plurality of electrode segments attached to the front side of the electrode substrate so as to form a discharge surface, and the electrode segments are provided through a mesh in a penetrating state of the net-like corrosion-resistant base material and a liquid flowing portion formed in the electrode substrate. Discharge surface When, characterized in that having a structure in which flow of fluid between the rear surface side of the electrode substrate it is allowed.

According to the above structure, even if a defect such as wear or damage occurs in some of the electrode segments due to the use of the electrode segments, it is sufficient to replace only the electrode segment that has won the defect, and the repair can be performed. It can be done easily. On the other hand, a reticulated corrosion-resistant base material is used as a base material (electrode base material) of the electrode segment, and a conductive portion mainly composed of lead dioxide is supported on a linear portion forming the mesh. The supporting area per unit weight of the active material can be increased, and the adhesive force of the conductive active material to the electrode substrate can be increased. This makes it difficult for the conductive active material to peel off or fall off during processing such as plating. In addition, since the amount of the conductive active material layer carried on the substrate surface can be relatively large, the electrode life can be extended.

The electrode of the present invention is disposed to face a plate surface of a member to be processed such as a steel sheet strip conveyed in the longitudinal direction, and is used for continuously performing an electrochemical treatment such as plating on the member to be processed. Can be used for In this case, according to the above-described first configuration, the following new effects can be obtained. First, in the method of dividing the electrode plate into segments, in the conventional electrode, the electrode is attached to the electrode base in a densely arranged form so that a gap is not formed between adjacent electrode segments as much as possible. However, when such an electrode is used in a continuous plating line using, for example, a steel plate strip as an object to be plated, if the speed of the object to be plated is high, a negative pressure is generated in a gap between the electrode and the object to be plated. In some cases, the object to be plated is attracted to the electrode side, which may cause a short circuit or a trouble such as poor plating.
Further, if the feeding speed of the plating object S is reduced to solve such a problem, the efficiency of the plating process is naturally reduced.

Therefore, in the first configuration of the electrode according to the present invention, the discharge surface side of the electrode segment is connected to the penetrating mesh of the reticulated corrosion-resistant substrate and the liquid flowing portion formed on the electrode substrate. Due to the structure that allows the flow of liquid between the back side of the electrode substrate and the member to be processed such as a steel strip moves at high speed while facing the discharge surface, a liquid flow is generated. However, since a liquid (for example, an electrolytic solution such as a plating solution) can flow between the front surface side and the back surface side of the electrode through the communicating part of the discharge member and the penetrating part of the electrode base, the member to be processed and the electrode And a negative pressure is unlikely to occur. As a result, it is possible to extremely effectively prevent a problem in which a member to be processed and the electrode are attracted and approached by the generation of a negative pressure to cause a trouble such as a short circuit. In addition, since the concern about the occurrence of negative pressure is reduced, it is possible to increase the feed speed of the member to be processed, and to greatly improve the efficiency of electrochemical treatment such as plating and electrolytic pickling using the electrode. be able to. As a result, even when applied to a plating line where the workpiece to be processed moves at high speed,
An electrode having a structure in which a negative pressure is hardly generated in a gap between the electrode and the object to be processed and in which a trouble such as a short circuit does not easily occur, and which can perform a good process with little uneven plating is realized. Furthermore, the use of the net-like corrosion-resistant base material makes it difficult for negative pressure to be generated, thereby making it possible to reduce the distance between the object to be processed and the electrode. As a result, energy can be saved. In addition, the hydrogen gas generated during the processing is released through the mesh, so that the hydrogen gas is hardly attached, which also contributes to a reduction in the processing voltage.

Next, a second configuration of the electrode according to the present invention is that the electrode is attached to the front side of the electrode base, with the side facing the member to be processed facing the front, and Ti, Nb and T
and a back plate composed of a corrosion-resistant metal mainly composed of one of Ti, Nb and Ta and integrated on the back side thereof And a conductive active material layer mainly composed of lead dioxide supported on a linear portion forming a mesh of the mesh-like corrosion-resistant base material, and one side faces the object to be plated when attached to the electrode substrate. And a plurality of electrode segments forming a discharge surface.

According to the above structure, the repair can be easily performed by using the electrode segments as in the first structure. On the other hand, since the mesh-like corrosion-resistant base material is used as the base material of the electrode segment, the supporting area per unit weight of the conductive active material is increased, and thus the adhesion of the conductive active material to the electrode base material is reduced. Can be bigger.
As a result, peeling of the conductive active material during processing such as plating, etc.
Drops and the like hardly occur. In addition, since the amount of the conductive active material layer carried on the substrate surface can be relatively large, the electrode life can be extended. Furthermore, by integrating the back plate on the back surface of the mesh-like corrosion-resistant substrate, the rigidity of the electrode segments is increased, and the conductive active material is peeled off and deformed due to the deformation of the substrate.
Dropping can be made more difficult. In this case, the conductive active material is added to the linear portion forming the mesh of the base material,
The amount of the conductive active material layer carried can be further increased by attaching the base material to the back plate surface side where the base material is overlaid.

In the second configuration, at least one of the following requirements can be further added. Thereby, the above-described second problem of the present invention can be solved at the same time. (1) In the electrode base, a liquid flow portion extending from the front side to the back side is formed on the side facing the member to be processed as a front side, and a through-hole (plate edge or corner) in the thickness direction is formed in the back plate. In the case where a notch is formed, the notch is also regarded as a through hole in a broad sense), and the mesh of the reticulated corrosion-resistant base material of the electrode segment, the through hole of the back plate, and the liquid flowing portion formed in the electrode substrate. , The structure allows the flow of liquid between the discharge surface side of the electrode segment and the back surface side of the electrode base. (2) On the electrode base, a liquid flow portion is formed from the front side to the back side with the side facing the member to be processed as the front side, and a plurality of electrode segments are placed between the electrode bases adjacent to each other. Attach so that a fixed amount of gap is formed,
Through a gap between the electrode segments and a liquid flowing portion formed in the electrode base, a structure is provided in which liquid can flow between the discharge surface side of the electrode segment and the back side of the electrode base. .

Next, a third configuration of the electrode according to the present invention is that the electrode is attached to the front side of the electrode base, with the side facing the member to be processed facing up, and Ti, Nb and T
(a) an electrode segment having a corrosion-resistant substrate composed of a corrosion-resistant metal mainly composed of any one of (a) and a conductive active material layer mainly composed of lead dioxide covering the surface of the corrosion-resistant substrate; A segment-side mounting support formed on the electrode side, a base-side mounting support formed on the electrode base side, and a coupling member for detachably connecting the segment-side mounting support and the base-side mounting support. A power supply path from the electrode base to each electrode segment is formed through the base-side mounting support, the coupling portion, and the segment-side mounting support, and the electrode base is made of a steel core material and a steel core material. A base-side mounting support portion made of a corrosion-resistant metal mainly composed of one of Ti, Nb and Ta, and a base-side mounting support portion protruding from the outer surface of the core material in a form in which the base end portions are joined, and covering the outer surface of the core material. At the joint between the core material and the base-side mounting support, a corrosion-resistant metal lining mainly made of one of Ti, Nb and Ta is provided so as to cover the base-side mounting support in such a manner as to extend over the outer surface of the base end. It is characterized by including.

According to the above structure, the repair can be easily performed by using the electrode segments as in the first configuration. In addition, since the segment-side mounting support formed on the back side of the electrode segment and the base-side mounting support formed on the electrode base are detachably connected by a connecting member, the electrode segment is penetrated. There are no mounting screws to be used, and the structure is simple. On the other hand, since the screw head and the like are not exposed on the discharge surface formed by the conductive active material layer,
The entire surface side of the segment can be used as a discharge surface, and non-uniform plating current is unlikely to occur. Furthermore, there is no need to worry about a problem such as peeling of the conductive active material layer due to biting of the bearing surface of the screw head. Further, in the electrode substrate, the corrosion-resistant metal lining covering the outer surface of the core material covers the base end of the substrate-side mounting support portion protruding from the substrate so as to extend over the outer surface. A good sealing state due to the lining of the core material can be maintained, and the sealing structure is not easily broken even if electrode segments are repeatedly attached and detached. In this case, it is more effective if the connecting position of the connecting member on the surface of the base-side mounting support is not covered with the corrosion-resistant metal lining.

The third configuration of the electrode according to the present invention can be combined with at least one of the first configuration and the second configuration.

[0015]

Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows a front view of an electrode 201 according to one embodiment of the present invention, together with a plan view and cross-sectional views taken along lines AA and BB. The electrode 201 has an electrode base 202 and a structure in which a plurality of electrode segments 211 and 250 are attached thereto. The electrode segments 211 and 250 are, as shown in FIG.
It has a structure in which the surface of a reticulated corrosion-resistant substrate 230 mainly composed of any one of i, Nb and Ta is covered with a conductive active material layer 231 mainly composed of lead dioxide. In the electrode segments 211 and 250, the conductive active material layer 23
1 forms a discharge surface. The thickness of the conductive active material layer 231 is, for example, about 50 μm to 5 mm (800 in this embodiment).
μm).

As conceptually shown in FIG. 2, the above electrode 2
01 is a steel strip SS as a member to be processed which is continuously conveyed in a longitudinal direction in a plating solution SL as an electrolytic solution.
On the other hand, the discharge surface is disposed so as to face the plate surface to be plated (both surfaces in this embodiment). Further, the electrode segments 211 and 250 forming the discharge surface are provided on the side facing the steel strip SS in the portion immersed in the electrolytic solution L.
(FIG. 1) is arranged. Then, by supplying electricity through the plating solution SL with the electrode side being the anode and the steel strip side being the cathode, metal cations in the plating solution SL are precipitated on the surface of the steel strip SS and are subjected to continuous plating. The steel strip SS is supplied with a plating solution S by a feed roll 51 or a guide roll 50 or the like.
L is transported. In this embodiment, the steel strip SS
Is continuously plated in the longitudinal direction, and chromium plating is performed on the plating bath using the electrolytic solution L. In order to improve plating efficiency, a fluoride bath containing sodium silicofluoride is used. It is used.

In the electrode 201, the reticulated corrosion-resistant substrate 23
The reason why 0 is made of a corrosion-resistant metal mainly composed of one or more of Ti, Nb and Ta is that these metals have excellent resistance to corrosion by an electrolytic solution such as a plating solution. In the present specification, “main component” or “main component” refers to a component having the highest weight content. In the corrosion-resistant metal, the content of a main component metal element composed of one or more of Ti, Nb, and Ta (for example, two of Nb and Ta) is 50% by weight or more, preferably 70% by weight or more. Is desirable from the viewpoint of ensuring corrosion resistance.

When the electrode 201 is applied to Cr plating,
It is desirable to use the above-mentioned fluoride bath as a plating solution. However, when using such a plating solution containing fluorine, it is particularly necessary to select a corrosion-resistant metal containing Nb or Ta as a main component. Is desirable. In this embodiment, the net-like corrosion-resistant substrate 230 is made of, for example, a net material of Nb. As shown in FIG. 5, the conductive active material layer 2 mainly composed of lead dioxide is formed in a linear portion forming the net 211p.
31 is carried. Such a conductive active material layer 23
1 can be formed, for example, by a method of electrodeposition on a reticulated corrosion-resistant substrate 230 from a lead nitrate bath or a lead monoxide bath. Note that in order to enhance the adhesion of the conductive active material layer 231, a base layer mainly composed of a Pt group metal such as Pt, Ir, or Ru or an oxide thereof may be formed.

As shown in FIG. 6, the state in which the conductive active material layer 231 is supported by the net-like corrosion-resistant substrate 230 is such that all or part of the plurality of meshes 211p maintain a penetrating state, in other words, The conductive active material layer 231 grown by electrodeposition or the like does not block the entire mesh 211p, and has a through hole 231a that allows liquid flow. Although the conductive active material layer 231 easily grows in the in-plane direction of the mesh, the closed area ratio of the conductive active material layer 231 in each mesh is preferably, for example, about 1% to 50%. Further, an electrode segment 211 composed of a reticulated corrosion-resistant substrate 230 and a conductive active material layer 231 carried on the substrate.
(Or 250) has an opening area ratio of 0.03 to 0.3.
5, preferably 0.1 to 0.35.
On the other hand, when it is not necessary to particularly consider the flow of a liquid for the purpose of suppressing the generation of negative pressure, as in the case of static plating, for example, the closed area ratio of the conductive active material layer 231 of each mesh and the electrode segment 211 ( Alternatively, the opening area ratio of (250) may be even smaller than the lower limit of the above numerical range.

As shown in FIG. 6, in this embodiment, the reticulated corrosion-resistant base material 231 is formed of a corrosion-resistant metal plate in which a plurality of cuts penetrating in the thickness direction are formed in a zigzag pattern on the entire surface. A diamond-shaped mesh formed by deforming in a crossing direction and opening a cut in the deformation direction is used. This is a so-called expanded metal, which has an advantage that it can be manufactured relatively inexpensively by cutting and expanding a plate-shaped material. In addition, there are the following specific advantages in carrying the slightly brittle conductive active material layer 231 mainly composed of lead dioxide. In other words, in the case of ordinary nets manufactured by knitting wires, the vertical and horizontal wires are essentially non-bonded at the intersections, and slide slightly with each other due to expansion and contraction when exposed to temperature changes. I do. When such sliding is repeated, cracks and the like are likely to occur in the conductive active material layer carried at the intersection of the wires, and in some cases, the conductive active material layer 231 may be easily peeled off. . However, in the expanded metal as described above, since the linear portions forming the mesh are all inseparably joined together, the above-described inconvenience is unlikely to occur.

It is to be noted that the interval D of the diamond-shaped mesh is determined by the average value of the long diagonal dimension T and the short diagonal dimension S (≡ (T +
As defined in S) / 2), D is 1.5 to 50 mm
It should be adjusted to. When D is less than 1.5 mm, the liquid circulation effect becomes insufficient. On the other hand, if it exceeds 50 mm, it becomes difficult to secure a sufficient discharge surface area, and the consumption of the conductive active material layer may be accelerated to shorten the life. D is more preferably adjusted to 2 to 24 mm. On the other hand, the cross-sectional diameter of the linear portion forming the mesh (the circular equivalent diameter of the cross-section of the linear portion at a substantially central position in the longitudinal direction is defined as the cross-sectional diameter) is 0.3 to
It is preferable that the distance is adjusted to 3 mm. 0.3 mm cross section diameter
If it is less than the above, it is difficult to secure the strength as a reticulated corrosion-resistant substrate. If the cross-sectional diameter exceeds 3 mm, the mesh interval D must be considerably large to sufficiently achieve the liquid circulation effect, and the current density tends to be excessive. Become.

Next, as shown in FIG. 1, a liquid flow portion 235 is formed on the electrode base 201 from the front side where the electrode segments 211 are attached to the back side.
Here, the electrode substrate 201 is formed in a frame shape, and only the surface layer portion is made of a corrosion-resistant metal mainly composed of Nb or Ta.

Specifically, the electrode substrate 202 is
A substantially U-shaped main body 2 is formed by connecting upper ends of vertical frames 202a, 202a, which are arranged substantially parallel to each other in the vertical direction on both sides in the width direction, by a horizontal frame 202b.
02m. In the vertical frames 202a, 202a,
Both ends of a horizontally long beam-shaped electrode segment support 204 arranged at a predetermined interval in the vertical direction are attached. The gap formed between the electrode segment supports 204 serves as a liquid flowing portion 235.

On the other hand, the lower ends of the vertically long suspension supports 202c, 202c are connected to the longitudinally intermediate portion of the horizontal frame 202b, while the suspension supports 202c, 202c are connected to the lower ends thereof.
A horizontal power supply unit 203 is coupled to an upper end of the power supply terminal c, and a power receiving terminal unit 203a is formed at one end thereof. Further, hooks 202d, 202d for suspending the electrode 202 on an electrode support beam or the like (not shown) are provided on the back side of the suspension support portions 202c, 202c.

The main body 202m of the electrode base 202, the electrode segment support 204, and the suspension supports 202c, 202
c, the power supply portion 203 (excluding the terminal portion 203a) is configured such that only the surface layer portion is made of the above-described corrosion-resistant metal, and the surface of a core material made of a steel material such as carbon steel is coated with a corrosion-resistant metal lining (hereinafter, simply referred to as “metal lining”). (Also called lining). Taking the electrode segment support 204 as an example, as shown in FIG.
b or Ta mainly: for example, Nb)
Core material 204a,
A configuration is provided in which the periphery of 204b is covered, and the joint portion of the lining 226 is sealed and sealed with a welded portion (not shown).

Here, the electrode segments 250, 211
For mounting, a horizontally long base-side mounting plate as a base-side mounting support (also made of corrosion-resistant metal)
205 is divided into core members 204a, 204 divided in the thickness direction.
b, and the bolts 222 are screwed into the second divided core material 204a from the side of the first divided core material 204b, through the base plate-side mounting plate 205, and they are integrally connected. Then, the head 222a of the bolt 222 is accommodated in a counterbore 204c formed on the first divided core member 204b, and the outside is wrapped in the circumferential direction with a lining 226, and the edge of the lining 226 is Both sides of the end are welded and sealed. As a result, the outer surfaces of the core members 204a and 204b are
26, and at the joint between the cores 204a, 204b and the base-side mounting support (base-side mounting plate) 205, the lining 226 is attached to the base-side mounting support 2
A structure that covers the outer surface of the base end portion 05 is provided.

The electrode segments 211 and 250 are detachably attached to the electrode base 202 by a coupling member 270 having at least a surface layer made of a corrosion-resistant metal mainly composed of Nb or Ta. In this embodiment, a horizontally long corrosion-resistant metal plate is bent at an intermediate position in the width direction so as to have an L-shaped cross section, and one side thereof is fixed in the width direction of the back surface side of the segments 211 and 250, and the segment side mounting support portion 236 is formed.
Is formed. Then, the segment side mounting portion 23
6 is superimposed on the base-side mounting plate (base-side mounting support) 205, and the nut 22 is attached to the bolt 223 passing therethrough.
4 (all are made of corrosion resistant metal)
To conclude. That is, the bolt 223 and the nut 2
24 constitutes the coupling member 270. The insertion hole 205h of the bolt 223 of the base-side mounting plate (that is, the coupling position of the coupling member 270) is provided in the corrosion-resistant metal lining 22.
Not covered by 6. Reference numerals 225 and 225 denote washers made of corrosion-resistant metal.

As shown in FIG. 2, the electrode 201 has a main discharge surface on one side of the metal strip SS while transporting a metal strip (eg, a steel strip) in the plating bath in the longitudinal direction. 240 is used as a plating electrode for plating it with facing it. At this time, from the electrode substrate 206, the substrate-side mounting support portion 205,
A power supply path to each of the electrode segments 211 and 250 via the coupling portion 270 and the segment-side mounting support portion 236 is formed. As shown in FIG. 3, a plurality of electrode segments 250 are arranged in the feeding direction of the metal strip SS, and a plurality of electrode segments 211 are arranged in the feeding direction and the width direction of the metal strip SS.

The butt edge (reference numeral 250i or 211s) of the electrode segment 250 and the electrode segment 211 generated in the feeding direction of the metal strip SS is:
It is formed inclined with respect to the feed direction. The abutting edge as described above is a portion where the plating current density is likely to be slightly non-uniform. However, by inclining the plating current density in the feed direction of the metal strip SS, the plating current density is not uniform in the strip width direction. The disadvantage that the positions are always the same is eliminated, which is advantageous for performing uniform plating.

When replacing the electrode segments,
If the shape and size of the exchanged segment were different depending on the position on the electrode, it would be necessary to prepare many types of spare electrode segments, which would be uneconomical. In the case where a failure occurs, there is also a problem that the repair cannot be performed immediately. Therefore, it can be said that it is advantageous to make the shape and size of all the electrode segments the same. When the inclined butted edge is formed as described above, it is desirable that at least the electrode segment 211 is formed in a parallelogram having substantially the same dimensions and substantially the same shape as shown in FIG. In this case, the first pair of sides 211p, 2
11p is located along the width direction of the metal strip SS,
The second opposite sides 211s, 211s are arranged so as to form a butted edge inclined with respect to the feeding direction of the metal strip SS.

On the other hand, regarding the electrode segment 250,
Although it may be formed on the same parallelogram as the electrode segment 211, in order to align the edges of the sub-discharge surface 250 on both sides in the electrode width direction in a straight line, as shown in FIG. It is desirable to do. That is, each electrode segment 250 has substantially the same size and substantially the same shape, the first pair of sides 250p, 250p are substantially parallel to each other, and one of the second sides is the first pair of sides 250p, 250p.
It is formed in a trapezoidal shape that is an orthogonal edge 250v substantially orthogonal to p and the other is an oblique edge 250i obliquely oblique to the first pair of sides 250p, 250p. Then, the oblique edge 250i is arranged so as to form an inclined butted edge with the second opposite side 211s of the electrode segment 211. In this manner, the electrode discharge surface, which is entirely rectangular, is formed on the electrode segment 25 despite the inclined butted edge.
0,211 can reasonably fill up. In addition, as shown in FIG. 4, the butting edge of the electrode segment 211 and the electrode segment 250 can be formed in a staggered manner in the width direction of the metal strip SS. Here, each of the segments 250 and 211 is formed in a rectangular shape.

According to the electrode 201, the conductive active material layer 2 mainly composed of lead dioxide is formed on the linear portions of the electrode segments 211 and 250 forming the mesh of the mesh-like corrosion-resistant substrate 230.
Since 31 is carried, the carrying area per unit weight of the conductive active material 231 can be increased. As a result, the adhesive force of the conductive active material 231 to the base material is increased, and the conductive active material 231 is less likely to be peeled or dropped. In addition, the amount of the conductive active material 231 carried on the substrate surface can be relatively large, so that the electrode life can be extended. On the other hand, as shown by the dashed arrow in FIG. 5, the electrode segment 211 (25) is passed through the mesh 211p (231a) in the penetrating state of the mesh-like corrosion-resistant base material 230 and the liquid flowing portion 235 on the electrode substrate side.
The flow of the liquid between the discharge surface side of 0) and the back surface side of the electrode base 206 is allowed. As a result, in FIG. 2, even if the steel strip SS moves at a high speed while facing the discharge surface and a liquid flow is generated, a negative pressure is generated between the steel strip SS and the electrode 206 due to the flow of the liquid. Hateful. As a result, it is possible to effectively prevent a problem that the steel strip SS and the electrode 206 are attracted and approach to each other due to the generation of a negative pressure to cause a trouble such as a short circuit. Further, when a problem such as wear or damage occurs in the electrode segments 211 and 250, it is sufficient to replace only the damaged electrode segment and the repair can be easily performed.

FIG. 7 shows a modification of the electrode segment (the same reference numerals are given to the parts common to FIG. 5 and the detailed description is omitted). In the electrode segment 260,
The back plate 240 made of the above-described corrosion-resistant metal is integrated with the back surface of the mesh-like corrosion-resistant substrate 230. Thereby, the rigidity of the electrode segments 211 and 250 can be increased. In this embodiment, the reticulated corrosion-resistant substrate 230 is
Back plate 240 at multiple locations by spot welding
It is stuck to. Also, the segment side mounting support portion 23
6 is joined to the back surface side of the back plate 240 by spot welding. Note that the conductive active material layer 231 is
In order to increase the amount of the base material 230 carried, the back plate 24
0 can be attached so as to also straddle the surface side.

As shown in FIGS. 8 and 9, in the back plate 240, a through-hole can be formed to penetrate the back plate 240 in the plate thickness direction in order to secure the above-mentioned liquid flow.
FIG. 8 shows an example in which the square through holes 240h are arranged and formed in a matrix. On the other hand, FIG.
This is an example in which a round through hole 240h is formed in a shape corresponding to 30 meshes.

When the suction of the steel strip SS is not a problem (for example, when the conveying speed of the steel strip SS is low), it is not particularly necessary to secure the liquid circulation, and the back plate 240 is It may be configured as a plate having no holes. On the other hand, while configuring the back plate 240 with a plate material having no through hole,
When liquid distribution is desired to be ensured, as shown in FIG. 10, a predetermined amount of gap G is formed between adjacent ones of the electrode segments 211 and 250 within a range that does not cause a problem such as uneven plating. The liquid may be circulated through the gap G by mounting. The gap G does not necessarily need to be formed between all adjacent edges of the electrode segments 211 and 250, and intersects the transport direction of the steel strip SS, which has little influence on plating unevenness, for example, as shown in FIG. It can also be formed only between the edges of the orientation.

Hereinafter, the reference invention will be described. In order to uniformly apply continuous plating to the entire surface of the steel strip, the discharge surface should be set slightly larger than the width of the steel strip so that the surface to be plated of the steel strip is completely included in the discharge surface of the electrode. Always. However, the discharge surface forming portion (hereinafter, referred to as a region outside the plate passing) located outside the plate passing region of the steel sheet strip basically does not contribute to the progress of plating, and thus has a potential lower than the discharge surface and becomes a cathode. There is a drawback that the discharge surface made of the conductive active material layer is easily consumed in the region outside the passing plate. For example, if the work is changed over to a wide steel strip, both edges in the width direction of the new work may overlap the outside area of the previous work, but the wear in the outside area of the work sheet progresses. If it is too much, it may cause defects such as poor plating. Further, as a problem that occurs when the entire electrode plate is integrally formed, when the consumption in the region outside the passage plate excessively progresses, even if the consumption of the discharge surface contributing to plating does not progress so much, the electrode may be damaged. They have to be exchanged and become extremely uneconomical.

In order to solve the above problem, the following electrode configuration is effective. That is, the electrode has a structure in which the surface of an electrode substrate and a corrosion-resistant base plate mainly composed of Ti, Nb or Ta are covered with a conductive active material layer mainly composed of lead dioxide. The active material layer is attached to the electrode base such that the main electrode plate forms a main discharge surface by the conductive active material layer, and the main electrode plate is formed separately from Ti, Nb, and Ta. And a noble metal-based coating layer mainly composed of a Pt group metal covering the surface of the corrosion-resistant base plate mainly composed of any one of the above. And attached to the electrode base so that
And a sub-electrode plate that forms a sub-discharge surface with the noble metal-based coating layer.

For example, when a metal strip as an object to be plated is transported in the longitudinal direction and a main discharge surface is opposed to one surface of the metal strip to be used as a plating electrode for plating the metal strip, an area outside the passing plate may be used. Due to the above-described cathodic formation, an environment where wear is likely to proceed is exposed. Therefore, by forming the discharge surface portions adjacent to both sides in the width direction of the main discharge surface, which are the outer regions of the passing plate, as the above-mentioned sub-discharge surface composed of a noble metal-based coating layer mainly composed of a Pt group metal, It is possible to extremely effectively prevent or suppress the consumption on the sub-discharge surface.

An example of the above-mentioned electrode can be configured to have the same form as that of FIG. 1. In this case, the electrode segments can be arranged as shown in FIG. 11, for example. In this example, the same electrode segments as those shown in FIG. 1 and the like are employed as main discharge segments (main electrode plates) 211 as the electrode segments corresponding to the passing regions of the steel sheet strip SS. The main discharge segment 211 forms a main discharge surface 340 by the lead-based coating layer 231 described above. On the other hand, those located in the area outside the passing plate are the electrode segments 21 in FIG.
Instead of 1, one having the following configuration is adopted as the sub-discharge segment (sub-electrode plate) 210.

That is, as shown in FIG. 12, the surface of the corrosion-resistant base plate 220 mainly composed of one of Ti, Nb and Ta is formed of a noble metal-based metal mainly composed of a Pt group metal (for example, Pt). It has a structure covered with a coating layer 221 (the same reference numerals are given to the same parts as in FIG. 5 and the detailed description is omitted). And the main discharge surface 34
The noble metal based coating layer 221 is attached to the electrode base 202 on both sides in the width direction of 0 (FIG. 11) such that the noble metal-based coating layer 221 is exposed. As shown in FIG.
0 is the sub-discharge surface 35 due to the noble metal-based coating layer 221 described above.
0 is formed. The thickness of the noble metal based coating layer 221 is, for example, about 1 to 400 μm (about 4.5 μm in this embodiment). The noble metal based coating layer 221 is made of, for example, the corrosion-resistant base plate 2.
30 can be formed by plating a Pt group metal such as Pt, Ir, Ru or the like, but a clad plate obtained by pressing (or welding) a thin plate of these metals onto a corrosion-resistant base plate can also be used (in this embodiment, this embodiment is not limited to this). Pt foil cladding).

By forming the sub-discharge surface 350 as described above with a noble metal-based coating layer, the consumption of the sub-discharge surface 350 can be effectively prevented or suppressed.
Further, even if a problem such as wear or damage occurs on the sub-discharge surface 350, the sub-electrode segment 210 forming the sub-discharge surface 350 is formed separately from the main electrode segment 211 forming the main discharge surface 340. Therefore, it is sufficient to replace only the sub-electrode segment 210, and the repair can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view, a plan view, a bottom view, and a side view showing one embodiment of an electrode of the present invention.

FIG. 2 is a schematic view showing an example of a use form of the electrode of FIG.

FIG. 3 is a front view extracting and showing an arrangement form of electrode segments in the electrode of FIG. 1;

FIG. 4 is a front view showing a modification of the shape and arrangement of electrode segments.

5 is a side sectional view showing an example of a structure for attaching the electrode segments of FIG. 1 to an electrode substrate.

FIG. 6 is an enlarged front view of a mesh corrosion-resistant base material.

FIG. 7 is a side sectional view showing an example of an electrode segment having a back plate together with a mounting structure thereof.

FIG. 8 is a schematic diagram showing an example of a form of forming a through hole in a back plate.

FIG. 9 is a schematic view showing a modified example of the same.

FIG. 10 is a front view showing an example in which a gap is formed between adjacent electrode segments.

FIG. 11 is a front view showing an example of the arrangement of electrode segments according to the reference invention.

FIG. 12 is a side sectional view showing an example of a structure for attaching the electrode segments of FIG. 11 to an electrode substrate.

[Explanation of symbols]

 201 electrode 202 electrode base 205 substrate-side mounting plate (substrate-side mounting support) 211,250 electrode segment 211p mesh 230 reticulated corrosion-resistant substrate 231 conductive active material layer 231a through hole 235 liquid flow part 236 segment-side mounting support 240 Main discharge surface 250 Sub discharge surface 270 Coupling member

Claims (11)

[Claims] 1. A side facing a member to be processed is defined as a front side.
An electrode substrate having a liquid flowing portion extending from the front side to the back side; and a reticulated corrosion resistance which is detachably attached to the electrode substrate and is made of a corrosion-resistant metal mainly composed of one of Ti, Nb and Ta. To the substrate, to the extent that all or a part of the plurality of formed meshes maintain a penetrating state, a conductive active material layer mainly composed of lead dioxide is formed in a linear portion forming the mesh of the mesh-like corrosion-resistant base material. A plurality of electrode segments attached to the front side of the electrode base so that one surface forms a discharge surface facing the object to be plated, and a mesh in a penetrating state of the reticulated corrosion-resistant substrate. And a structure in which liquid flow between the discharge surface side of the electrode segment and the back surface side of the electrode base is allowed through a liquid flow portion formed in the electrode base. Features Electrode. 2. A reticulated corrosion resistance which is attached to a front side of an electrode base and the electrode base with a side facing a member to be processed facing up, and which is made of a corrosion-resistant metal mainly composed of Ti, Nb or Ta. The substrate is integrated with the back side,
a back plate composed of a corrosion-resistant metal mainly composed of any one of i, Nb, and Ta; and a conductive active material layer mainly composed of lead dioxide supported on a linear portion forming a mesh of the mesh-like corrosion-resistant substrate. And a plurality of electrode segments, one of which forms a discharge surface facing the object to be plated when attached to the electrode base. 3. The reticulated corrosion-resistant base material of the electrode segment deforms a corrosion-resistant metal plate in which a plurality of cuts penetrating in a plate thickness direction are formed in a zigzag pattern over the entire surface in a direction intersecting the cut forming direction. The electrode according to claim 1, wherein a diamond-shaped mesh is formed by opening the cut in the deformation direction thereof. 4. When the interval D of the diamond-shaped mesh is defined by an average value of a dimension T of a long diagonal line and a dimension S of a short diagonal line, the D is adjusted to 1.5 to 50 mm. The electrode according to claim 3. 5. The electrode according to claim 3, wherein a cross-sectional diameter of the linear portion forming the mesh is adjusted to 0.3 to 3 mm. 6. The electrode base has a liquid flow portion extending from the front side to the back side with the side facing the member to be processed facing the front side, and the back plate has a through-hole in the thickness direction. Is formed, the mesh of the mesh-like corrosion-resistant base material of the electrode segment, the through-hole of the back plate, and the discharge surface side of the electrode segment via the liquid flowing portion formed in the electrode base. The electrode according to any one of claims 2 to 5, wherein the electrode has a structure that allows a liquid to flow between the electrode substrate and the back surface side. 7. The electrode base has a liquid flow portion extending from the front side to the back side, with the side facing the member to be processed facing the front side. Attached so that a predetermined amount of gap is formed between adjacent ones, the gap between the electrode segments, and through the liquid flowing portion formed in the electrode base, the discharge surface side of the electrode segment, The electrode according to any one of claims 2 to 6, wherein the electrode has a structure that allows a liquid to flow between the electrode substrate and the back surface side. 8. A segment-side mounting support formed on the back side of each electrode segment, a base-side mounting support formed on the electrode base, a segment-side mounting support, and a base-side mounting support. A coupling member for detachably coupling the electrode base, and a power supply path from the electrode substrate to each electrode segment through the substrate-side mounting support, the coupling portion, and the segment-side mounting support. 8. The electrode according to any one of 1 to 7. 9. An electrode base comprising: a steel core; a base end coupled to the core;
The base-side mounting support portion made of a corrosion-resistant metal mainly composed of one or more of b and Ta, and an outer surface of the core material, and a connecting portion between the core material and the base-side mounting support portion Ti, Nb and T, which cover the base-side mounting support part so as to extend over the outer surface of the base end part.
9. The electrode according to claim 8, comprising a corrosion-resistant metal lining mainly composed of any one of (a) and (c). 10. An electrode substrate and a corrosion-resistant substrate which is attached to the front surface of the electrode substrate with the side facing the member to be processed facing up, and is made of a corrosion-resistant metal mainly composed of Ti, Nb or Ta. An electrode segment having a material and a conductive active material layer mainly composed of lead dioxide covering the surface of the corrosion-resistant substrate; a segment-side mounting support formed on the back side of each electrode segment; And a connecting member for detachably connecting the segment-side mounting support and the base-side mounting support to the substrate-side mounting support, the substrate-side mounting support from the electrode base, A power supply path to each electrode segment is formed through the member and the segment-side mounting support, and the electrode base has a steel core and a base end with respect to the core. The base-side mounting support portion made of a corrosion-resistant metal mainly composed of any of Ti, Nb, and Ta, and is arranged so as to protrude from the outer surface of the core material in a combined form, and covers the outer surface of the core material, At the joint between the core material and the base-side mounting support, Ti, Nb and T cover the base-side mounting support so as to extend over the base end outer surface.
a. A corrosion-resistant metal lining mainly composed of any one of (a) and (b). 11. The processing method according to claim 1, wherein the processing object is disposed so as to face a plate surface of the processing object conveyed in the longitudinal direction, and is used to continuously perform an electrochemical process on the processing object. The electrode as described.