JPS6096775A - Tabular electric current flowing anode - Google Patents

Abstract

PURPOSE:To prevent the core metal attached to the interior of an anode material from separating from said anode material, in preparing a current flowing anode for electric protection, by embedding a metal net or a reticulated plate made of a metal in the single surface of a tabular electric current flowing anode material piece almost over the entire surface thereof. CONSTITUTION:In preparing a current flowing anode used in electric protection, a metal net or a metal reticulated plate 12 cast in the single surface of a tabular electric current flowing anode material piece 10. Or, the metal net or the metal reticulated plate 12 are superposed to the tabular electric current flowing anode material piece 10 and the whole is rolled to embed said metal net or metal reticulated plate in the tabular electric current anode material piece 10 under pressure. In another method, an insulating sheet 16 comprising an asphalt rubber sheet is adhered to the single side to the tabular electric current flowing anode material piece 10 having the above mentioned metal net or metal reticulated plate 12 embedded therein or the tabular electric current passing anode material piece 10 and the rubber sheet 16 are superposed and the metal net or metal reticulated plate 12 is placed thereon and rolled to penetrate the metal net or metal reticulated plate 12 into the anode material piece through the insulating rubber sheet 16. By this method, the tabular electric current flowing anode wherein the metal net or metal reticulated plate 12 as a core metal is not separated from the anode material piece 10 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a plate anode used for cathodic protection.

BACKGROUND ART Galvanic anodes used for cathodic protection include block galvanic anodes and strip galvanic anodes.Bulky galvanic anodes are generally made by casting an iron core into the center of a block anode abrasive piece. It is used by connecting this core metal to the object to be protected. On the other hand, in the case of plate anodes, some have a thickness of Q, 5 mm, so it is not possible to cast an iron core when manufacturing the plate anode material pieces.
As shown in Fig. 1, a metal strip-shaped core 1 is fixed to a strip anode material piece 2 by spot welding or the like, and electrically conductive, and then, if necessary, the core metal mounting surface 3G is painted. are giving. Note that the core metals 1 are connected to each other through a conductor 4G.

However, since the core metal 1 is small compared to the surface area of such a plate anode material piece 20 and the thickness of the galvanic anode is thin (G), the core metal 1
If the galvanic anode is locally consumed at a location away from the galvanic anode, the ff3 piece of the strip anode material ahead of it will be separated, and no anticorrosion effect can be expected for that part. In addition, since the core metal 1 covers the entire surface of the strip anode material, it is inconvenient to carry and handle.

Purpose of the Invention Therefore, the present invention solves the above-mentioned drawbacks, and provides a method in which each part of the strip anode material is fixed and electrically connected to the core metal regardless of the wear and tear of the strip anode material during use. It is an object of the present invention to provide a strip current anode (without partial separation from the core metal).

According to the present invention, there is provided a plate strip characterized in that a metal wire mesh or a mesh plate is at least partially embedded in substantially the entire surface of one side of a plate strip galvanic anode material piece. A galvanic anode is provided.

In one embodiment of the present invention, the metal wire mesh or mesh plate is a metal wire mesh or mesh plate press-fitted onto almost the entire surface of one side of the plate strip galvanic anode material piece. be.

In the plate strip current anode configured in this way, each part of the metal wire mesh or mesh plate is fixed and electrically connected to each part of the plate strip anode material piece over almost the entire surface of the plate strip anode material piece. . Therefore, regardless of the wear and tear of the plate anode material piece due to use, each part of the plate anode material piece can maintain its fixation and electrical connection to the core metal, and no partial separation from the core metal occurs. do not have.

Furthermore, according to the present invention, a metal wire mesh or a mesh plate is at least partially embedded in substantially the entire surface of one side of the galvanic anode material piece in the strip shape, and There is provided a plate current anode characterized in that one side is covered with an insulating layer. Also in this example,
The metal wire mesh or mesh plate is made of metal and is press-fitted onto almost the entire surface of one side of the strip of galvanic anode material from above the insulating layer covering one side of the strip of galvanic anode material. wire mesh or mesh plate.

EXAMPLES Hereinafter, examples of the plate anode according to the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a schematic perspective view of a first embodiment of the plate anode according to the present invention. As shown, the plate anode according to the present invention is comprised of a piece of plate anode material 10 and a metal gauze or mesh plate 12 at least partially embedded in substantially the entire surface of one side thereof. There is. A leader wire 14 is connected to a part of the metal wire mesh or mesh plate 12.

When the thickness of the plate anode material piece 10 is 101 or more, the metal wire mesh or mesh plate 12 is embedded in the plate anode material piece 10.
This can also be achieved by casting 2. However, this is difficult when the thickness of the strip anode material piece 10 is less than 10W.

Therefore, as a method that is not affected by the thickness of the plate strip 2 anode material piece 10, for example, a metal wire mesh or a mesh plate 12 is laid on top of the plate strip anode material piece 10 and rolled. A metal wire mesh or mesh plate 12 is press-fitted into 10.

It is thought that such a plate strip anode has almost no difference in anode performance from one in which a strip anode material piece and a metal core plate of approximately the same size are bonded together. However, in order to ensure the bonding between a piece of plate anode material such as zinc and a core metal plate such as iron, it is necessary to ensure the cleanliness of the interface of the joint surface and a large rolling blade, which is costly. The disadvantage is that it is difficult to use due to its high temperature.

On the other hand, a metal wire mesh or mesh plate 12 is stacked on top of the plate anode material piece 10 and rolled, and the plate anode material piece 10 is rolled.
When press-fitting a metal wire mesh or mesh plate 12 into 0,
Since the thin wire rod is simply pushed into the strip anode material piece 10, a small rolling blade is sufficient. In addition, when press-fitting the metal wire mesh or mesh plate 12 into the strip anode material piece 10,
Since the metal wire mesh or mesh plate 12 is rubbed and cleaned by the strip anode material piece 10, each part of the metal wire mesh or mesh plate 12 is reliably electrically connected to the strip anode material piece 10. There is no need to completely clean the metal wire mesh or mesh plate 12 beforehand. Therefore, it can be manufactured easily and inexpensively.

Further, the electrical connection between the metal wire mesh or mesh plate 12 and the strip anode material piece 10 is sufficient if the metal wire mesh or mesh plate 12 is electrically connected at at least one point for each winter of the mesh. Therefore, if the metal wire mesh or mesh plate 12 is press-fitted into the strip anode material piece 10 to the extent that the metal wire mesh or mesh plate 12 is sufficiently mechanically fixed to the strip anode material piece 10; Even if the metal wire mesh or mesh plate 12 is not completely cleaned during press-fitting, sufficient electrical connection between the two can be ensured.

FIG. 3 is a schematic perspective view of a second embodiment of the plate anode according to the present invention. Similar to the first embodiment, this plate anode includes a plate anode material piece 10 and a metal wire mesh or mesh plate 12 embedded at least partially in almost the entire surface of one side of the plate anode material piece 10. Furthermore, the entire surface of the strip anode material piece 10 on the wire mesh or mesh plate 12 side is covered with an insulating layer 16. Similarly, a leader wire 14 is connected to a part of the metal wire mesh or mesh plate 12.

In the plate strip current anode, when the strip anode material piece 10 is consumed from the metal wire mesh or mesh plate 12 of the core metal of the current flow anode, the metal wire mesh or mesh plate 12 of the core metal is removed. If the anode becomes detached, it may not be able to fully demonstrate its anode performance. For this purpose, by providing the insulating layer 16 as in the second embodiment,
Since the metal wire mesh or mesh plate 12 side of the strip anode material piece 10 is insulated, the strip anode material piece 10 from the metal wire mesh or mesh plate 12 side is consumed and the metal wire mesh or mesh plate is insulated. Since the plate 12 does not come off the strip anode material piece 10, the anode performance can be fully exhibited for a long period of time.

Also in the case of this second embodiment, the metal wire mesh or mesh plate 1
When the thickness of the strip anode material piece 10 is 10 or more, the embedding in the strip anode material piece 10 can also be done by casting a metal wire mesh or mesh plate 12 into the strip anode material. However, as a method that is preferably not affected by the thickness of the strip anode material piece 10, for example, a metal wire mesh or mesh plate 12 is rolled over the strip anode material piece 10 and rolled.
Plate anode material - metal wire mesh or mesh plate 12 on piece 10
Press in.

In this way, by press-fitting the metal wire mesh or mesh plate 12 into the strip anode material piece 10, the metal wire mesh or mesh plate 1
2 is one side of the strip anode material piece 10, that is, the insulating layer 16
It can be moved to the side. This is because when the insulation N16 is provided, the plate anode material piece 10 is consumed from the side opposite to the insulating layer 16, so the plate anode material piece 10 is It is possible to ensure electrical connection between the metal wire mesh or the mesh plate 12, which is extremely convenient in practice.

However, the entire surface of one side of the strip anode material piece 10 is covered with an insulating layer 1 in advance.
6 is formed, and the insulating layer 1 of the strip anode material piece 10 is
Even if a metal wire mesh or mesh plate 12 is rolled over the 6 side and the metal wire mesh or mesh plate 2 is press-fitted into the strip anode material piece 10 by piercing the insulating layer 16, this It is also possible to make a plate current anode according to the second embodiment.

The strip current anode as described above can be used in the same manner as a conventional strip current anode. For example, as shown in FIG. 4, the plate anode of the first embodiment is stacked on the metal body 18 to be protected, and the lead wire 14 of the plate anode is welded to the metal body 18 to be protected. Connect by brazing, screwing, etc., or the exposed gold B of the plate current electrode anode! ! ! The wire mesh or mesh plate 12 is directly connected to the corrosion-protected metal body 18 by welding or the like.

Further, the plate anode of the second embodiment is, for example, as shown in FIG. The lead wire 14 is connected to the corrosion-protected metal body 18 placed in the metal body 18 by welding, brazing, screwing, etc.

The strip anode material piece 10 of the plate strip anode of the present invention is made of zinc or its alloy, A2 alloy, M
Although a g-alloy is preferable, a composition deviating from known compositions may be used in order to ensure workability.

The thickness of the strip anode material piece 10 is naturally determined by the need for press-fitting the metal wire mesh or mesh plate 12 and economic efficiency, and is preferably about 0.5 to 15 mm thick.
It is not limited to this value.

Furthermore, the metal wire mesh or mesh plate 12 can be used by cutting a commercially available rolled wire mesh made of steel when the plate strip current electrode anode is in the form of a plate. When it is in the form of a strip, it may be used as it is in a roll. The weave, mesh, and wire diameter may be arbitrary, but they should be selected with emphasis on economic efficiency.

As the press-in method, a cold rolling method is preferable, but other processing methods such as press molding may be used for small-sized products. The press-fitted state may be such that the outer surface of the wire mesh substantially matches or slightly protrudes from the outer surface of the metal body that produces the galvanic action.

The area that the metal wire mesh or mesh plate 12 covers the strip anode material piece IO occupies about 75% or more of the area of one side of the strip anode material to which the metal wire mesh or mesh plate 12 is to be attached. It is desirable that the portion not covered by the metal wire mesh or mesh plate 12 be separated from the metal wire mesh or mesh plate 12 by at most 20 degrees.

Hereinafter, specific examples of the plate current anode of the present invention will be described.

A commercially available hexagonal wire mesh (mesh size 16, wire diameter 0.55 m) of the same shape was placed on a pure zinc plate with a thickness of 1.5 mm, a length of 1000+A+, and a medium size of 350 μm, and rolled in a two-high rolling machine to form a wire mesh. A press-fitted zinc plate with a thickness of 0.9 mm was obtained. The wire mesh of this press-fit plate was completely press-fit into the zinc plate and could not be easily peeled off. Then, zero on the wire mesh side of the obtained zinc plate.
．． An asphalt rubber sheet with a thickness of 5 days was pasted and cut into a predetermined size. The cutting was done in a short fan shape, and 14 pieces were arranged in a circular shape and laid under the bottom plate of a heavy oil tank to form a galvanic anode for preventing corrosion of the tank bottom plate. When the condition of this galvanic anode was observed one year later, it was found that the zinc melting was uniform and in good condition.

A galvanic anode was prepared by press-fitting a commercially available woven wire mesh with a wire diameter of 0.1!1 lfl14 mesh into a zinc plate with a thickness of 0.6 nm using a rolling method. After this, I applied acrylic baking paint to the wire mesh side.

Wire diameter Q, 5+ on zinc plate coated with epoxy baking coating with two thicknesses
A wire mesh of n was press-fitted. As a result of the wire mesh being press-fitted with the paint pushed in, the inside of the wire mesh was electrically connected to the zinc, and the outside of the wire mesh appeared to be sticking out from the painted surface. This was used as an experimental anode in artificial seawater, a steel plate was placed as a counter electrode, and a current corresponding to 1 mA/(anode area c11+) was forcibly passed between the two for 20 days. As a result, the zinc melted from the opposite side of the wire mesh, but neither the iron wire mesh nor the coating film exposed on the outer surface of the wire mesh side was affected.

Effects of the Invention As is clear from the above, the strip anode according to the present invention is such that each part of the metal wire mesh or mesh plate is fixed to each part of the strip anode material over almost the entire surface of the strip anode material. Because they are electrically connected, each part of the strip anode material can maintain its fixation and electrical connection to the core metal regardless of the wear and tear of the strip anode material piece, and also the partial release from the core metal. There are no words that cause separation.

In addition, the plate anode of the present invention, in which a metal wire mesh or a mesh plate is embedded in a piece of plate anode material, is easy to attach the core bar to the piece of plate anode material, and is highly reliable. Suitable for corrosion protection of objects with a large surface area that are not always used as an electrolyte or whose entire surface is not wetted, such as corrosion protection of oil tank bottom plates, and splash zones such as piers of offshore structures and steel piles. It is.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a plate anode using a conventional method for attaching a core metal, FIG. 2 is a perspective view of a first embodiment of the plate anode of the present invention, and FIG. The figure is a perspective view showing the second embodiment of the plate current anode of the present invention, with the insulating layer partially peeled off. FIG. 51 is a sectional view showing a state in which a strip current anode is used, and a 51st sectional view showing a state in which a plate strip current anode according to the second embodiment of the present invention is installed on a tank bottom plate. (Main reference numbers) 1: core metal, 2: strip anode material piece, 4: conductor, 10: strip anode material piece, 12: metal wire mesh or mesh plate, 14: leader wire, 16: insulation Layer 18 is a metal body to be protected from corrosion. Applicant Mitsui Kinzoku Mining Co., Ltd. Nakagawa Anticorrosion Industry Co., Ltd. Agent Patent Attorney Arai Diagram 1 Diagram 4 1/'1 Procedure? City official document (voluntary) 1. Display of the case Patent Application No. 204402 of 1982 2, Title of the invention Plate current electrode anode 3, Person making the amendment Relationship to the case Name of the patent applicant (618) Mitsui Kinzoku Mining Co., Ltd. Name Nakagawa Corrosion Industry Co., Ltd. 4. Address of the agent ■ 703 New Belle Mode Building, 3-3 Kojimachi, Chiyoda-ku, Tokyo (1) A metal wire mesh or mesh plate is at least partially covered on almost the entire surface of one side of a strip of galvanic anode material. A plate current anode characterized by being embedded in a plate. (2) The metal wire mesh or mesh plate is press-fitted into substantially the entire surface of one side of the galvanic anode material piece of the plate strip, as set forth in claim 1. Plate current anode. (3) A metal wire mesh or a mesh plate is at least partially embedded in almost the entire surface of one side of the strip of galvanic anode material, and one side of the strip of galvanic anode material is insulated. A plate anode characterized in that it is covered with a layer. (4) The metal wire mesh or mesh plate is press-fitted into substantially the entire surface of one side of the strip of galvanic anode material. Plate current anode. (5) The insulating layer is an insulating paint applied to one side of the plate-like galvanic anode material in which a metal wire mesh or a mesh plate is embedded. The plate anode according to item 3 or 4. (6) The insulating layer is an insulating sheet glued to one side of the strip-like galvanic anode material having a metal wire mesh or a mesh plate embedded therein. The plate anode according to item 3 or 4. (7) The plate anode according to claim 6, wherein the insulating sheet is an asphalt rubber sheet or the like. (8) The metal wire gauze or mesh plate is press-fitted onto an insulating layer covering one side of the strip of galvanic anode material. 4. Plate current anode according to item 1 or 4.

Claims (8)

[Claims] (1) A plate-shaped current anode characterized in that a metal wire mesh or a mesh plate is at least partially embedded in substantially the entire surface of one side of a plate-shaped current current anode material piece. (2) The metal wire mesh or mesh plate is press-fitted into substantially the entire surface of one side of the galvanic anode material piece of the plate strip, as set forth in claim 1. Plate current anode. (3) A metal wire mesh or a mesh plate is at least partially embedded in almost the entire surface of one side of the strip of galvanic anode material, and one side of the strip of galvanic anode material is insulated. A plate anode characterized in that it is covered with a layer. (4) The metal wire mesh or mesh plate is press-fitted into substantially the entire surface of one side of the strip of galvanic anode material. Plate current anode. (5) The insulating layer is an insulating paint applied to one side of the plate-like galvanic anode material in which a metal wire mesh or a mesh plate is embedded. The plate anode according to item 3 or 4. (6) The insulating layer is an insulating sheet glued to one side of the strip-like galvanic anode material piece in which a wire mesh or mesh plate made of gold N is embedded. The plate anode according to item 3 or 4. (7) The plate anode according to claim 6, wherein the insulating sheet is an asphalt rubber sheet or the like. (8) The metal wire mesh or the wedge-shaped plate is press-fitted onto an insulating layer covering one side of the strip-shaped galvanic anode material piece, and the strip-shaped galvanic anode is characterized in that: .