JPS63103789A - Pollution preventing device for structure being in contact with sea water - Google Patents

Abstract

PURPOSE:To eliminate the need for repainting a structure by installing an electrically conductive body made of iron, copper, or carbon in the sea opposite to an electrically conductive film which covers the surface of said structure which is brought into contact with sea water and providing a power source for applying a DC current from said film to said electrically conductive body. CONSTITUTION:A DC current 9 is made flow from the positive electrode of an electrically conductive film 4 provided on a structure 1 which is brought into contact with the sea water 2 to the negative electrode 8 of an electrically conductive body installed in the sea water 2, by means of a power source device 6. Due to the electrification of this DC current 9, the surface of the electrically conductive film 4 is covered with a thick film of chlorine, thereby, regulating the rate of elution of a pollution preventing ingredient of a pollution preventing paint coated on the part of the structure 1 which is brought into contact with the sea water 2, eliminating the need for repainting.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an antifouling device for structures in contact with seawater.

[Conventional technology]

BACKGROUND ART Conventionally, as a means for preventing stains on structures that come into contact with seawater, such as ships and marine structures, a method of applying an antifouling paint to the parts of the structure that come in contact with water has been generally employed.

However, such means have the following drawbacks.

(1) Since the elution rate of the antifouling component of the antifouling paint cannot be adjusted, it is not possible to freely respond to changes in seasons, ocean currents, water quality, etc.

(2) There is a limit to the amount of toxic substances in antifouling paint, so approximately 2
Repainting work is required every year.

(3) For structures that cannot be exposed to the atmosphere due to their structure,
It is not possible to change the paint 9 times.

[Problem that the invention seeks to solve]

The present invention was proposed in view of these circumstances, and
The purpose of the present invention is to provide a high-performance and economical antifouling device for structures in contact with seawater, which is capable of adjusting the elution rate of antifouling components and does not require repainting work.

[Means for solving problems]

To this end, the present invention provides an antifouling device for structures in contact with seawater, such as ships and marine structures, in which the surface in contact with water is made of a metal such as carbon, magnetite, manganese dioxide, or white metal, an organic binder, a metal conductive substrate, or an organic conductive substrate. An electrically conductive film that coats the surface of a structure and is made of an insoluble electrical conductor, or whose water contact surface is carbon, magnetite, manganese dioxide,
A mixture of at least two or more metals such as white metal and an organic binder.

An electrically conductive film that covers the surface of a structure and is made of at least two kinds of insoluble electrical conductors such as a metal conductive substrate or an organic conductive substrate, and an electrically conductive film that faces the electrically conductive film and is made of iron.

an electrical conductor made of copper or carbon placed in seawater;
The present invention is characterized by comprising a power supply device that is disposed between the electrically conductive film and the electrical conductor and supplies direct current from the electrically conductive film in the direction of the electrical conductor.

[For production]

With the above configuration, (1) direct current flows from the anode of the electrically conductive membrane attached to the structure in contact with seawater to the cathode in the sea;
The surface of the electrically conductive film is covered with a thick chlorine film to provide an antifouling effect.

(2) If a structure in contact with seawater is used as a cathode and an electrically conductive film attached to the structure is used as an anode, if the electrically conductive film or insulating layer is locally damaged and the steel plate is exposed, the electrically conductive A portion of the direct current flowing out of the protective film flows into the exposed portion of the steel plate, providing cathodic protection.

〔Example〕

Embodiments of the present invention will be explained with reference to the drawings. FIG. 1 is a longitudinal sectional view showing the first embodiment, FIG. 2 is a partially enlarged view showing the operation of FIG. 1, and FIG. 4 is a plan view taken along IV-IV in FIG. 3, FIG. 5 is a longitudinal sectional view showing the second embodiment, and FIG. 6 shows the effect of FIG. 5. FIG.

First, in the first embodiment shown in FIGS. 1 and 2, 1 is a steel plate constituting the outer panel of the steel structure in contact with seawater 2, and 3 is an insulating layer made of resin-based reinforced plastic or the like that covers the outside of the steel plate 1. , 4 is an electrically conductive film made of carbon, magnetite, *metal, etc. and an organic binder that covers the outside of the insulating layer 3, and the electrically conductive film 4 is an electrically conductive film 11, which will be described later. It is connected to one terminal (→ pole) of the DC power supply 6 via the lead wire 5.

7 is the other terminal of the DC power supply 6 (→ a lead wire connecting the pole and the cathode 8 made of iron and copper).

9 is a direct current flowing between the electrically conductive film 4 and the cathode 8;
Reference numeral 10 denotes a bushing welded to the periphery of the inner end of a through hole drilled in the steel plate 1, and reference numeral 11 denotes a bushing plated with platinum metal to prevent an increase in contact resistance on the surface of the portion in contact with the electrically conductive film 4. In order to prevent Faraday melting due to electric current, it is a plug-shaped current-carrying piece made of niobium, tantalum, titanium, etc., and an external thread 12 is carved at the tip of the current-carrying piece 11.

13 is a plastic washer made of polyethylene, a rubber sheet, a tetrafluoroethylene resin sheet, etc. for insulating the steel plate 1 and the current-carrying piece 11 and keeping water out; 14 and 15 are between the current-carrying piece 11 and the steel plate 1; Bushing 10
16 is a rubber bushing made of natural rubber, neoprene, butyl rubber, etc. inserted between the current-carrying piece 11 and the steel plate 1; 17 is a rubber bushing made of natural rubber, neoprene, butyl rubber, etc.; Electrifying piece 11! = An insulating washer made of polyethylene, a rubber sheet, a tetrafluoroethylene resin sheet, etc. that insulates the M plate L, 18 is the current-carrying piece 1
1 to the steel plate 1, the outer screw 12 of the current-carrying piece 11
The reference numeral 19 designates a current-carrying end protective lid having an internal thread for screwing into the bushing 10 and a lead wire extraction hole 20 in the center.

In such a device, as shown in FIG. 2, when the electrically conductive membrane 4 is used as an anode and a direct current 9 is caused to flow into the seawater 2, stain conductivity occurs due to the reaction of 2 cl−+2 e −+ 2c12. The surface of the chlorine film 4 is covered with a thick chlorine film to prevent marine organisms from adhering to the surface.

The current density of the DC current 9 flowing out from the electrically conductive film 4 at this time has a direct relationship with the chlorine concentration generated at the interface of the electrically conductive film 4, and its magnitude depends on the temperature of the ocean, the flow state, Although it varies depending on the degree of seawater pollution and the 40 types of electrically conductive membranes,
in general,! It is economical to set the diameter to 0.1 A/i or less when the electrically conductive film 4 is made of carbon material, and to 0.01 A/i or less when it is made of platinum material.

Then, the current-carrying pieces 11 (see FIG. 1) are provided at appropriate intervals depending on the thickness of the electrically conductive film 4 by 2 areas, and are connected to a DC current 9.
flows uniformly from the electrically conductive film 4 to the cathode 8.

Next, in the modification shown in FIGS. 3 and 4, 4a is the steel plate 1
A thin wire or net plated with a noble metal of titanium, niobium, tantalum or copper and containing a core of titanium, niobium, tantalum or copper disposed within the electrically conductive film 4 of the invention.

Alternatively, the base end of the conductive wire 4a is connected to the current-carrying piece 11 using an insoluble conductive wire made of carbon fiber or the like.

In such a device, a conductive wire 4a having relatively good conductivity is used.
Since the current is passed through the conductive film 4, even if the current-carrying piece 11, which is a current-carrying terminal, is located at one location and is away from the seawater, the DC current 9 flows out from the electrically conductive film 4 over a sufficiently wide range, and the coating is completed. Parts can be made stain-proof.

As described above, this modified example has the same antifouling effect as the first example, but is useful when used on a ship's outer plate or the like where the current-carrying piece 11 cannot be attached at a level that comes into contact with seawater.

Furthermore, in the second embodiment shown in FIGS.
The same symbols as in the figure indicate the same parts as in the same figure, and 6
Reference numeral a designates a DC power supply in which the DC power supply 6 is provided with an intermediate voltage extraction point 21 for the DC output voltage, 22 a lead wire connecting the DC power supply 6a and the steel plate 1, and 23 an exposed portion of the steel plate.

In such a device, as shown in FIG.
Since the electrically conductive film 4 and the electrically conductive film 4 were made to have a potential of (←) and the electrically conductive film 4 to a potential of (→), the electrically conductive film 4 and the insulation M3 were locally damaged and the steel plate When the exposed portion 23 is formed, if the position of the intermediate voltage extraction point 21 of the DC power source 6a is properly positioned, a part of the DC current 9 flowing out from the electrically conductive film 4 flows into the steel plate exposed portion 23, and as a result, , which is cathodic protected.

This corrosion protection strength is determined by determining the position of the intermediate voltage extraction point 21 (
If it is shifted to the → side, the applied voltage between the electrically conductive film 4 and the exposed steel plate portion 23 increases, so it can be increased.

As described above, the second embodiment has the same antifouling effect as the first embodiment, but it can also provide an even more anticorrosion effect. Also,
It is also possible to obtain antifouling effects for structures whose outer panels are not made of steel plates.

According to such a device, the following effects can be achieved.

(1) Since the elution rate of antifouling components can be adjusted according to the season, ocean currents, and water quality, antifouling performance and economic efficiency are improved.

(2) Since the antifouling component has a permanent lifespan, there is no need to change the coating nine times, making it economical.

〔Effect of the invention〕

In short, according to the present invention, in an antifouling device for structures in contact with seawater such as ships and marine structures, the water contact surface is made of a metal such as carbon, magnetite, manganese dioxide, or white metal, an organic binder, a metal conductive substrate, or an organic conductive substrate. An electrically conductive film that coats the surface of a structure and is made of an insoluble electrical conductor such as, or a mixture of at least two or more metals such as carbon, magnetite, manganese dioxide, white metal, etc., and an organic binder, a metal conductor, etc. an electrically conductive film that covers the surface of the structure and is composed of at least two types of insoluble electrical conductors such as a base or an organic conductive substrate; an electrical conductor installed in seawater, and a power supply device that supplies direct current from the electrically conductive film installed between the electrically conductive film and the electrical conductor in the direction of the electrical conductor; The present invention is industrially extremely useful because it provides a high-performance and economical antifouling device for structures in contact with seawater, which allows the elution rate of antifouling components to be adjusted and does not require repainting. It is something.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, FIG. 2 is a partially enlarged view showing the operation of FIG. 1, and FIG. 3 is a longitudinal sectional view showing a modification of FIG. 1. Figure 4 shows r'/- of Figure 3.
FIG. 5 is a longitudinal sectional view showing the second embodiment, and FIG. 6 is a longitudinal sectional view showing the operation of FIG. 5. 1... Steel plate, 2... Seawater, 3... Insulating layer, 4... Electrically conductive film, 4a... Conductor wire, 5... Lead wire, 6, 6a...
DC power supply, 7.Lead wire, 8.Cathode, 9.DC current, 10.Pu, sing, 11.Conducting piece, 12.
・External thread, 13...Plastic washer, 14.1
5. Insulating filler, 16. Rubber bushing, 17.
Insulating washer, 18... Nut, 19... Current-carrying end protective cover, 20... Lead wire outlet hole, 21... Intermediate voltage outlet point, 22... Lead wire, 23... Steel plate exposed part sub-agent
Patent Attorney Masa Tsukamoto Figure 3 Figure 4 Figure 5a Figure 6

Claims (1)

[Scope of Claims] In an antifouling device for structures in contact with seawater such as ships and marine structures, the surface in contact with water comprises a metal such as carbon, magnetite, manganese dioxide, or white metal, an organic binder, a metal conductive substrate, an organic conductive substrate, etc. an electrically conductive film that covers the surface of a structure, or a mixture of at least two or more metals such as carbon, magnetite, manganese dioxide, white metal, an organic binder, and a metal conductive substrate. or an electrically conductive film that covers the surface of the structure and is made of at least two or more insoluble electrical conductors such as an organic electrically conductive substrate, and an electrically conductive film that is made of iron, copper, or carbon and that faces the electrically conductive film. an electrical conductor installed in seawater, and a power supply device that supplies direct current from the electrically conductive film installed between the electrically conductive film and the electrical conductor in the direction of the electrical conductor. An antifouling device for structures in contact with seawater.