JP3224378B1 - Adsorption type composite current anode - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To facilitate installation in place of means for underwater arc welding of a metal core inserted into a galvanic anode for performing electrolytic protection using a galvanic anode such as a metal fixed structure in water or under the sea. To provide a composite anode with no fear of thermal effects. SOLUTION: An iron plate for supporting a galvanic anode (2) is provided between a galvanic anode (2) and a bond magnet sheet (1) made of a resin and / or rubber sheet containing magnetic particles. 3) An adsorption-type composite galvanic anode characterized by having an integrated joint structure through 3).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a galvanic anode for cathodic protection, which is used for controlling or preventing corrosion of metal structures in a water-corrosive environment such as underwater or seawater. The present invention relates to a structure for attaching a current carrying anode to a steel fixed structure when an object is subjected to electrolytic protection with a current carrying anode.

[0002]

2. Description of the Related Art Steel structures in contact with water or seawater, such as cooling seawater supply pipes, steel pipe piles, various types of ship outer plates or steel sheet piles, are extremely important elements in controlling or preventing corrosion by water or seawater. Needless to say, Today, cathodic protection is an indispensable technology for preventing corrosion of seawater supply pipes and fixed structures installed in water or in seawater.
This cathodic protection includes an external power supply system and a galvanic anode system.
The external power supply system is widely applied to the corrosion prevention of large fixed structures requiring long-term large currents (for example, marine and harbor steel fixed structures) and underground buried objects. There is a risk of power failure or disconnection, and there are many cases where the anticorrosion target structure is installed in an inconvenient area off the street,
Maintenance is not easy.

On the other hand, the galvanic anode method is a corrosion prevention method using a battery action utilizing a potential difference, which does not have the above-mentioned problems in maintenance and maintenance, and is used in water or seawater having a large electric conductivity of the environment. Widely used for anticorrosion. In particular, long life (1
Since the development of a large-scale high-performance aluminum alloy anode (from 0 to 50 years), this galvanic anode method has been used almost as a means for preventing corrosion of fixed structures installed in water or seawater. By the way, in this galvanic anode system, it is necessary to attach the galvanic anode to the metal structure, and as the attaching means, 1) hanging system, 2) stud bolt system, and 3) underwater welding system have been known. ing.
However, 1) In the hanging method, since the fixing in the underwater part is not sufficient, the hanging bracket is easily broken by repeated stress due to wave force. 2) In the stud bolt method, a stud bolt for mounting a galvanic anode is welded on a metal structure (for example, a steel sheet pile, a steel pipe pile) to be protected from corrosion in advance on land, and the metal structure is cast into the sea. In this method, the depth of the metal structure is slightly different depending on the location, so that the position of the stud bolt in the sea is out of plan. For the above reasons, 90% or more of galvanic anodes are currently installed in Japan by 3) underwater welding method. By the way, this 3) underwater welding method is described in FIG. 1 (“Zairyo-to
-Kankyo "Vol. 49, no. 4, p. 522
(Reprinted from FIG. 5) is a method in which a galvanic anode is hung in water and metal fittings attached to both ends of the galvanic anode are attached to a metal structure such as a steel pipe sheet pile by a dive welder.

However, this 3) underwater welding method also has a serious problem of "brittle fracture" as described below. When attaching a galvanic anode to a corrosion-resistant metal structure by underwater welding, the mounting portion of the metal structure is rapidly heated,
It is quenched. As a result, the tensile strength and elongation of the attached portion are reduced, which causes the absorbed energy of external force to be reduced, and increases the probability of brittle fracture of the metal structure. In fact, in the case of the Tohoku and Hokkaido earthquakes, the steel sheet pile at the part where the aluminum alloy anode for galvanic anode was attached by underwater welding on the liquefied steel sheet pile quay in the background was reported by the Ministry of Transport's Port and Harbor Research Institute. The following is introduced in "Material mechanical study on improvement of fracture mechanism and fracture mode of underwater welded steel sheet pile structure" (Marine Institute of Technology, Vol. 36, No. 4, 1997.12). Have been.

The "... Japan Sea Central Earthquake (1983)
An example was reported in the Kushiro Earthquake (1993) of a steel sheet pile type quay where the ground behind was liquefied, and a steel sheet pile was damaged at a location where an aluminum alloy anode for electrolytic protection was attached by underwater welding. The main factor was that excessive pressure was applied to the sheet pile due to liquefaction of the ground behind, but it was presumed that embrittlement of the steel sheet pile due to the attachment of the anode by underwater welding was also an indirect cause. However, the phenomenon has not been experimentally confirmed so far, and no countermeasures have been taken in actual construction, so there was concern that similar damage would recur in the future.
Against this background, the Port Technical Research Institute, the Steel Pipe Pile Association, and the Cathodic Protection Industry Association conducted joint research with the aim of examining the following items. (Page 47, “1.
Preface ”)

[6. Conclusion] This report describes the relationship between the fracture mode of steel sheet piles subjected to thermal history by underwater welding and the chemical composition of steel against the background of the damage to steel sheet pile quays during the Japan Sea Central Earthquake and the Kushiro-oki Earthquake. Grasp,
The following conclusions were obtained as a result of conducting a series of material experiments to obtain knowledge on the improvement of the fracture mode. (1) Through a full-scale experiment of underwater welding and aerial welding of steel sheet piles (current JIS standard products and improved chemical components), it was confirmed that underwater welding had a high heat input and tended to be rapidly cooled. (2) The steel sheet piles welded in water have lower tensile strength and elongation than those welded in air, and do not satisfy the JIS standard values. As a result, the absorbed energy of external force decreases, and the probability of brittle rupture sharply increases.・ ・ ・ (8) In consideration of the above, the composition of new steel sheet piles was aimed at not to make the material deterioration of steel materials caused by underwater welding of steel sheet piles harmful. Proposed. ("67. Conclusion" on page 67)

As described above, mounting by underwater welding is as follows.
In addition to the difficulty of undersea work, there is a concern that the material may be deteriorated due to thermal strain on the structure, and it may be difficult to maintain the design strength (JIS standard). Composition) has been proposed. (By the way, installation of a galvanic anode by underwater welding is hardly performed in Europe and the United States because of the problem of "brittle fracture.") However, it is JIS standard to change to a new steel sheet pile component (composition). And the renewal of the manufacturing methods and equipment of the steel maker accompanying this, requires a great deal of cost and energy. Therefore, as a means for fixing the galvanic anode to a metal structure such as a steel sheet pile by a method other than underwater welding without changing the components (composition) of the steel sheet pile, a resin containing magnetic powder and / or Technology using a rubber sheet (hereinafter referred to as a bond magnet sheet)
157002) has been proposed.

[0008]

However, according to the technology disclosed in Japanese Patent Application Laid-Open No. H10-157002,
An adhesive (epoxy resin, acrylic resin, etc.) is used to fix zinc (current-carrying anode) to the bond magnet sheet, and a rolled thin plate having a thickness of 0.1 to 5 mm is used as the zinc. . And, as this specific use mode, it is introduced that the intake pipe is curved and attached to the inner surface thereof.

When a large structure such as a steel sheet pile quay or a seawall is to be protected for a long period of 30 to 50 years, for example, 8.7 m below the water depth × 15 in total length
0 m area, bottom area is 1500 cm ² and thickness is 1
The standard specification is to attach about 80 aluminum alloy anodes having a trapezoidal cross section of 20 mm and a weight of 48 kg. Therefore, even if the bond magnet sheet is to be attached to the structure with the above-mentioned bond magnet sheet, as described later, the bond magnet sheet exerts an attractive force of well over 48 kg on the structure if the area is 1500 cm ^2. However, the support between the aluminum alloy anode and the bond magnet sheet cannot be stably supported and fixed for a long period of time only with an adhesive. Furthermore, when the anode is made of zinc having a much higher specific gravity than the aluminum alloy as in the prior art, it is impossible at all.

Accordingly, the present inventor has developed a method for fixing a large current-carrying anode to a metal structure such as a steel sheet pile in water or seawater for a long period of time using a bonded magnet sheet. We have been conducting various researches and experiments. As a result, they succeeded in developing an extremely innovative method, and completed the present invention.

Hereinafter, the present invention will be described. The first invention is
An iron plate (3) for supporting the galvanic anode (2) is provided between the galvanic anode (2) and the bonded magnet sheet (1) made of a resin and / or rubber sheet containing magnetic powder particles. Is an adsorption-type composite galvanic anode with an integrated joint structure.
And the galvanic anode (2) has a built-in core (4),
By joining (4) with the iron plate (3), the galvanic anode
An adsorption-type composite galvanic anode characterized in that (2) and an iron plate (3) are integrated with each other . The second invention is that the core metal (4) is made of a plurality of filaments and thin rods. A protrusion (c) formed by joining the galvanic anode (2) and the iron plate (3) by joining the protrusion (c) to the iron plate (3). 1 invention,

A third invention is the first or second invention, characterized in that the joining means is welding, and a fourth invention is a method of connecting an iron plate (3) and a galvanic anode (2). An adhesive layer (5) is provided between the iron plate (3) and the bond magnet sheet (1).
The fifth invention is any one of the first to fourth inventions, characterized in that the iron plate (3) is a steel plate. The bond magnet sheet (1) according to any one of the first to fifth inventions, wherein the bond magnet sheet (1) is an anisotropic single-sided or double-sided multipolar magnetized sheet containing ferrite-based powder anisotropic particles. The invention according to a seventh aspect is the invention according to any one of the first to sixth aspects, wherein the galvanic anode (2) is made of aluminum, zinc, magnesium or an alloy based on these metals.
The invention of any one of the first to seventh aspects, wherein the bottom area of the galvanic anode (2), the surface area of the iron plate (3), and the surface area of the bond magnet sheet (1) are substantially equal to each other. .

Next, each component of the present invention will be described in detail. -Bond magnet sheet (1) The bond magnet sheet is formed by mixing 30 to 90 parts by weight of magnetic powder particles with 100 parts by weight of resin and / or rubber, forming a sheet, and magnetizing the sheet. It is a 5 mm plate. The magnetic powder may be any permanent magnet powder such as rare earth, alnico, ferrite, etc., but ferrite powder is preferred from the viewpoint of easy availability including cost. Ferrite-based particles include anisotropic particles and isotropic particles. Anisotropic particles have the property of being magnetized only in the direction of the axis of easy magnetization, and by arranging the particles in the product magnetization direction by a magnetizing operation, the magnetic force is two to three times as large as that of the non-aligned one. Are obtained, so that the anisotropic particles are more excellent.

The resin may be either a thermoplastic resin or a thermosetting resin. Among them, those excellent in weather resistance, corrosion resistance and workability are preferable, and for example, chlorinated polyethylene, nylon and the like are preferable. The rubber may be either natural rubber or synthetic rubber. Similarly, those excellent in weather resistance, corrosion resistance and workability are desirable, and for example, acrylic rubber, nitrile rubber, silicone rubber and the like are preferable. If the resin and the rubber are compatible, they may be used as a mixture.

According to the magnetizing method, if the area of the bond magnet sheet is increased, a sufficiently large attracting force (supporting force) can be obtained even with single-sided (multipolar) magnetizing, but in the present invention, an iron plate for supporting the galvanic anode is used. Considering the following, double-sided (multi-pole) magnetization is advantageous for the following reasons. When an iron piece is placed in a magnetic field, the magnetic flux tends to pass through the iron piece having as high a magnetic permeability as possible. Therefore, as shown in FIG. 2, when the iron plate (3) is attached to the back surface of the bond magnet sheet (1), the magnetic flux that has protruded outward passes through the iron plate (3), as if the iron plate (3). Acts to form a closed circuit of the magnetic flux, and the magnetic flux is inverted on the surface of the bond magnet sheet (1). As a result, the magnetic flux density increases on the surface of the bond magnet sheet (1), and the attraction force increases. In addition, in the field of bond magnet technology, an iron plate exhibiting this function is particularly called an “iron yoke”. In the case where the iron yoke is provided, the attraction force is increased by 30 to 50% in the double-sided magnetization with respect to the single-sided magnetization. Therefore, in the present invention, double-sided magnetization is desirable because an iron plate for supporting the galvanic anode is used in combination.

The above-mentioned bond magnet sheet is generally widely sold, for example, commercially available under the trade name of “Plastic magnet FP MagX” (manufactured by Magex Co., Ltd.), and has a thickness of 2 to 4 mm. In the case of single-sided magnetization, the attraction force is 900 to 1300 (Kg / m
² ) Or, in the case of double-sided magnetization, the attraction force is 1000 to 140
Those of about 0 (Kg / m ² ) are easily available. Regarding the galvanic anode (2) The galvanic anode may be zinc, aluminum, magnesium or an alloy based on these metals.
It is desirable to insert a mandrel in advance at the time of manufacture, whereby the following two functions can be expected. When the galvanic anode is consumed non-uniformly during use, a part of the anode may fall off. This fall can be prevented. The galvanic anode can be firmly joined (for example, welded) to an iron plate (also serving as a yoke made of iron) via the metal core.

Further, it is preferable that the cored bar has a plurality of projections made of filaments and thin rods, and the projections are joined to an iron plate. Specifically, the metal core may be a plate-like, strip-like, mesh-like or lattice-like shape carrying a plurality of filaments or thin rods protruding from the surface thereof. Or, using a thin rod, means such as welding and bolting, and if necessary, a combination thereof, and bonding to the iron plate with an adhesive. (If the galvanic anode is thin, the galvanic anode can be joined to the iron plate with only an adhesive, regardless of the presence or absence of the cored bar.) The galvanic anode is usually used in shape. It is preferable that the cross-sectional area of the current flowing anode is 1 to 5 times, preferably 2 to 4 times, and the cross section is a trapezoidal or rectangular long rectangular material. If the bottom area is designed to be larger, the area of the bond magnet sheet is set to an area corresponding to the area, so that the force (adsorption force) for supporting the galvanic anode can be increased.

Regarding the iron plate (3) Since the iron plate primarily supports the galvanic anode, it has a strength capable of supporting the galvanic anode and, secondly, the action of the iron yoke. Since it plays, any iron member having a magnetic permeability as large as possible may be used. Preferably, a flexible sheet made of steel (for example, having a thickness of 1 to 5 m)
m). The adsorption-type composite galvanic anode of the present invention described above can be used, if necessary, in the above-mentioned bond magnet sheet (1).
In order to further improve the corrosion resistance of the edge portion and the helicopter portion, a protective layer made of a material having excellent corrosion resistance may be provided on the portion.

[0018]

The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the invention. (Reference Example 1) "Adsorption force of ferrite-based bond magnet sheet" Adsorption force and thickness of a commercially available anisotropic single-sided or double-sided magnetized bond magnet sheet containing ferrite-based powder anisotropic particles. The effect of attaching a polished steel plate (iron yoke) with a thickness of 0.9 mm and seawater immersion (420
Day) was investigated. The results are shown in Table 1 below.
Each adsorption force represents a numerical value (Kg) converted per 1 m ^{2 of} the bond magnet sheet. According to the results shown in Table 1, as the thickness of the bond magnet sheet increases, the attraction force increases. When the thickness is 3 mm (hereinafter, “thickness” is abbreviated as t), both the attraction force and the up ratio are high, and at 4 mmt, the attraction force increases, but the up ratio is almost constant. Compared to the case without a polished steel plate (iron yoke), the magnetization on one side is increased by about several% and the magnetization on both sides is increased by 25% or more. In addition, although there was a fear that the magnetic force (adsorptive force) was reduced by immersion in seawater, there was almost no difference before and after immersion. Based on this result, considering a case in which a normal aluminum alloy anode having a weight of 48 kg and a bottom area of 1500 cm ² is joined with a bond magnet sheet having the same area, a bond magnet sheet of 2 mmt with single-side magnetization is obtained as follows.
Approximately 2.8 times the anode weight (896 × 0.15 / 48 =
For a bonded magnet sheet with a double-sided magnetized and polished steel plate (iron yoke) with a suction force of 2.8) of 2 mmt, the suction force of about 4 times the anode weight is about 5.4 times at 3 mmt. When the force is also 4 mmt, about 5.7 times the suction force can be obtained respectively.

[0019]

[Table 1] (Reference Example 2) “About the bottom area of the galvanic anode and the attraction force of the bond magnet sheet” Since the bottom area of the galvanic anode and the area of the bond magnet sheet are substantially equal, if the area of the bottom area of the galvanic anode is enlarged. The attraction force of the bond magnet sheet will also increase. Then, the adsorption force of the bond magnet sheet when the bottom area of the galvanic anode was enlarged was investigated according to (Reference Example 1). That is, 0.9 m is applied to a bonded magnet sheet having an area corresponding to the bottom area of the galvanic anode and a predetermined thickness.
A sheet to which a m-thick polished steel plate (iron yoke) was stuck and a sheet to which it was not stuck were prepared, and the absolute value of the adsorption force according to the magnitude of the adsorption area of the sheet (that is, the bottom area of the galvanic anode) was compared.
Table 2 shows the results.

According to the results shown in Table 2, the unit adsorbing power tends to increase somewhat as the adsorbing area increases, but no significant difference is observed. As the suction area increases, the absolute value of the suction force increases proportionally. Based on this result, weight 4
Considering the case where the bottom area of a normal aluminum alloy anode having a bottom area of 8 kg and 1500 cm ² is enlarged and bonded, a bond magnet sheet with a 2 mmt single-sided magnetization is:
If the bottom area is the standard 1500 cm ² , 135K
When the bottom area is doubled, the adsorption power is 270/48 = 5.6 times, and when the bottom area is tripled, 8.4 times when the bottom area is doubled. The bond area of a bonded magnet sheet with a 2 mmt double-sided magnetized and polished steel plate (iron yoke) is 150 mm based on the base area.
In the case of 0 cm ² , about four times the suction force is obtained, and in the case where the bottom area is three times, about 12 times the suction force, respectively.

From the above, it can be seen that the adsorbing power of 10 times or more of the weight of 48 kg of the aluminum alloy anode (in order to cope with an accident in seawater, the safety factor is 5 times, preferably 10 times the weight of the anode). (A) If a single-sided magnetized bond magnet sheet is used, the thickness of the aluminum alloy anode should be 3 mm or more regardless of the presence or absence of a polished steel plate (iron yoke). It is necessary to make the bottom area of the anode three times (4500 cm ² ) or more. (B) When a double-sided magnetized bond magnet sheet is used, the bottom area of the anode is 3 mmt with a polished steel plate (iron yoke). It may be doubled (3000 cm ^2), if a 3-fold the bottom area of the anode (4500cm ^2), the thickness of the sheet can be accomplished in 2 mmt.

[0022]

[Table 2]

[0023]

Example 1 "Manufacture of adsorption type composite galvanic anode with iron yoke" Based on Reference Examples 1 and 2, adsorption composed of a galvanic anode of the present invention + polished steel plate (iron yoke) + bond magnet sheet A composite anode was fabricated. An example of the specific structure and manufacturing method will be described below with reference to FIGS. First, FIG. 3 ((a): plan view, (b): BB ′ longitudinal sectional view)
As shown in (1), the vertical member (a) and the horizontal member (b) were welded, and a vertical thin rod (c) was welded to the vertical member (a) so as to protrude therefrom, thereby forming a metal core (4). This cored bar (4) is placed in a mold (not shown) having a cavity whose bottom area is three times larger than that of a normal current-carrying anode and whose height is designed to be lower by the vertical rod ( C) is arranged so that a part of it is exposed outside the cavity, an aluminum alloy for a galvanic anode is poured, and a galvanic anode (2) having a flat rectangular cross section [weight: 48 kg, dimensions:
(90mm (top width) + 110 x 3mm (bottom width)) x 57
mm (height) x 1360 mm (length)].

Then, a polished steel plate (3) of 0.9 mmt having a size substantially corresponding to the bottom area [(110 × 3 mm) × 1360 mm] of the galvanic anode (2) is prepared. A number of holes (6) (FIG. 4) for inserting the thin rods (c) of the core metal (4) projecting from 2) were formed. Next, an epoxy-based adhesive having excellent corrosion resistance and adhesiveness is uniformly applied to the bottom surface of the galvanic anode (2) or one surface of the polished steel plate (3) to form an adhesive layer (5 ₁ ). did. Subsequently, the two are closely adhered and integrated via the adhesive layer (5 ₁ ), and at the same time, a thin rod (c) of a metal core (4) projecting from the galvanic anode (2) is provided on the polished steel plate (3). Into the hole (6),
The thin rod (c) was welded and joined to the polished steel plate (3), the excess protruding portion was cut, and polished so as to be flush with the surface of the polished steel plate (3). Subsequently, as shown in FIG. 4, the other side of the polished steel plate (3) is partially peeled off between the steel plate (3) and the bond magnet sheet (1) by an unexpected external impact. to suppress, the epoxy adhesive partially (especially near the suction surface) thinner or the entire surface may be formed an adhesive layer was uniformly applied (5 _2). (However, this adhesive layer (5 ₂ ) is not always necessary.) Thereafter, anisotropic double-sided magnetization of 2 mmt ferrite-based powder anisotropic particles blended to the polished steel plate (3) is substantially the same size. bond magnet sheet (adsorption force unit area per m ² without iron yoke: 974Kg)
(1) is adsorbed / adhered to the metal structure at 577K
g (12 times the weight of the galvanic anode (2)) to obtain an adsorption-type composite galvano anode with an iron yoke.

[0025]

Example 2 "Production of adsorption type galvano anode with iron yoke for mounting steel sheet pile" FIG. 5 ((a): front view, (b): As shown in the plan view (c): side view), the width of the polished steel plate (3) and the bond magnet sheet (1) is larger than the width of the bottom surface of the galvanic anode (2) and protrudes on both sides thereof. Then, this protruding part is shown in FIG.
As shown in (1), the tide barrier steel sheet pile (8) (FIG. 6) was curved so that it could be sucked along the end of the projection. At this time, an electrically insulating shadow mask (7) provided with a hole for adjusting the generated current, if necessary, on the surface of the galvanic anode (1) of the adsorption type composite galvano anode with an iron yoke. And a headless bolt (contact terminal) (10) for establishing electrical continuity with the steel sheet pile (8) [FIG.
FIG. 4B is a sectional view taken along line cc ′ of FIG. ). ]
Can also be provided. (In addition, this headless bolt (10)
By projecting or retracting, the adsorption-type composite galvanic anode with an iron yoke can be attached to the steel sheet pile (8) by gradually adsorbing it, or can be made to function to be gradually peeled off and removed. 6.) The adsorption type composite galvanic anode with an iron yoke was mounted on an actual tide bank 8 as shown in FIG. The tide barrier steel sheet pile (8) has a total length of about 150 m and a water depth of 8.7 m below the LWL. Twenty-eight adsorption-type composite anodes with an iron yoke were attached to a steel sheet pile of about 34 m out of 150 m.

According to this mounting method, more than 28 wires could be mounted in half a day. Therefore, the number of working days is 0.1.
It was less than five days. In addition, since there was no heat work, the necessary auxiliary equipment could be greatly reduced. In addition, the adverse effect of thermal deterioration of the structural material due to underwater welding could be avoided 100%. About 2.5 years have passed since the installation, but no damage was observed as well as the anticorrosion effect.

[0027]

[Comparative Example 1] (90 mm (upper surface width) + 1)
10 (bottom width) mm) x 120 mm (height) x 1360 mm
(Length)], and a general-purpose aluminum alloy anode weighing 48 kg was used, and the core was cast in advance during the production of the anode and was directly joined to the steel sheet pile (8) by underwater welding.
The installation does not work as expected by welding work underwater,
The number of installations was less than 20 per day, and the number of working days also took 1.5 days or more. In addition, special equipment was required for underwater welding. After installation, about 2.
Although the anticorrosion effect has been exhibited as expected even after 5 years, there is a serious concern about the breakage of steel sheet piles due to thermal deterioration of structural materials due to underwater welding in the future.

[0028]

According to the present invention, in performing electrolytic protection using a galvanic anode such as a metal fixed structure underwater or in the sea, a core inserted into the galvanic anode is replaced by a conventional means for arc welding underwater.
Since it is possible to provide a composite galvanic anode that is easy to install and is not subject to thermal effects, it greatly contributes to the industry.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an underwater welding method.

FIG. 2 (a) is a diagram showing a distribution of magnetic field lines of a single-sided magnetized bond magnet sheet alone, and FIG. 2 (b) is a diagram showing a magnetic field line distribution of the bond magnet sheet with an iron yoke.

FIG. 3 (a) is a plan view of a core metal with a built-in galvanic anode,
(B) is a sectional view taken along the line BB 'of FIG.

FIG. 4 is a cross-sectional view of an adsorption-type composite flow anode with an iron yoke, which is composed of a galvanic anode + a core metal + an adhesive layer + a polished steel plate (iron yoke) + bond magnet sheet.

5A is a front view of an adsorption-type galvanic anode with a polished steel sheet (iron yoke) for mounting a steel sheet pile, and FIG. 5B is a plan view of the same.
(C): It is the same side view.

FIG. 6 is a diagram in which an adsorption-type galvanic anode with a polished steel plate (iron yoke) is attached to a tide protection steel sheet pile.

FIG. 7 is an enlarged sectional view taken along the line cc ′ of FIG. 6B.

[Explanation of symbols]

1: Bond magnet sheet 2: Galvanic anode (aluminum alloy) 3: Polished steel plate (iron yoke) 4: Core bar A: Core bar vertical bar B: Core bar horizontal bar C: Core bar thin bar D: Welded part 5 ₁ : adhesive layer 5 _2: adhesive layer 6: hole 7: shadow mask 8: sheet pile 9: tie rod, 10: headless bolt (contact terminals) 11: zinc paste (filler)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C23F 13/00-13/22 H01F 7/02

Claims (8)

(57) [Claims] 1. An iron plate for supporting a galvanic anode (2) between a galvanic anode (2) and a bonded magnet sheet (1) made of a resin and / or rubber sheet containing magnetic particles. Adsorption type composite flow with integrated structure through (3)
Electro-anode, current-carrying anode (2) with built-in core (4)
Then, by joining the metal core (4) with the iron plate (3),
An adsorption-type composite galvanic anode characterized in that the galvanic anode (2) and the iron plate (3) are integrated . 2. The core metal (4) includes a plurality of projections (c) formed of a plurality of filaments and thin rods, and the projection (c) is joined to an iron plate (3) to form a galvanic anode (3). 2. The adsorption-type composite galvanic anode according to claim 1, wherein the iron plate (2) and the iron plate (3) are integrated. 3. The adsorption-type composite galvanic anode according to claim 1, wherein the joining means is welding. 4. Between the iron plate (3) and the galvanic anode (2) and / or the iron plate (3) and the bond magnet sheet (1).
The adsorption type composite galvanic anode according to any one of claims 1 to 3, wherein an adhesive layer (5) is provided between the anode and the substrate. 5. The adsorption-type composite galvanic anode according to claim 1, wherein the iron plate (3) is a steel plate. 6. The bond magnet sheet (1),
An anisotropic single-sided or double-sided multipolar magnetized sheet containing ferrite-based powder anisotropic particles, characterized by the above-mentioned.
5. The adsorption-type composite galvanostatic anode according to any one of 5. 7. The adsorption-type composite current collector according to claim 1, wherein the current collector anode (2) is made of aluminum, zinc, magnesium or an alloy based on these metals. anode. 8. The method according to claim 1, wherein a bottom area of the galvanic anode, a surface area of the iron plate, and a surface area of the bond magnet sheet are substantially equal to each other. Adsorption type composite galvanic anode.