JPS62130292A - Electrolytic corrosion preventive energizing device - Google Patents

Abstract

PURPOSE:To permit safe energization of a body to be protected from corrosion immersed in an electrolyte soln. with the titled device which supplies low voltage current via a structural body which is an electrode when energized to said body to be protected. CONSTITUTION:An anode structural body 2 is constituted by integrally combining an insoluble anode 3, a current rectifier 4 and a boosting transformer 5 to make corrosion prevention of, for example, a ship 1 of the type to prevent the sticking of ocean living things. The secondary voltage V2 which is the voltage of the energizing wires passing the hull is thereby maintained at the low voltage safe to the human body, and the high voltage is loaded to the hull so that the current distribution of the outside plate of the hull is maintained uniform by the energization from the far apart anode. For example, a winch 14 to wind up the energizing wires 6, 8 is provided to the stern in order to house the anode part in the stern during anchoring.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a cathodic protection energizing device.

[Conventional technology]

In order to effectively carry out cathodic protection, it is important to uniformly distribute the protective current over the object to be protected, and for this purpose, as shown in the side view in Figure 3, a large number of anodes K are connected to the object S to be protected. Since it is necessary to arrange the device around the device, the device structure becomes complicated.

Therefore, as a means to make the current distribution uniform, as shown in the side view of FIG. 4, the distance between the object S to be protected and the anode is 1. ．． 1.
There is a method of increasing the length of the anode.In this case, the voltage loss increases due to the large underwater resistance between the anode and the object to be protected, but the anode
Only one person is required, and the equipment is simple.

Here, if the distance 4 from the anode K to the surface of the object S to be protected is sufficiently larger than the length L of the object S, as shown in the figure, the current will flow even to the back side of the object S. On the other hand, in the example shown in Figure 3, which uses a large number of anodes, the power supply voltage V can be kept low, and if the anodes are moved far apart, a high voltage can be obtained. is necessary.

In addition, when the object S to be corroded is coated, the resistance between the anode and the object to be corroded is large (this means that the anode is effectively separated from the object S), and the current distribution is easily made uniform.

Therefore, the object to be protected against corrosion is a huge structure like a ship,
Moreover, in the case of no coating, a large number of anodes are required, and a fourth
The method shown in the figure is practical.

Therefore, in order to improve this point, it is possible to increase the anode area, but using a large amount of expensive anode material is not desirable for the same reason as stated in Figure 3. Used at high current densities, in other words:
In practical use, it should be considered that it is used in a state where there is a certain degree of resistance.

For ships, it is effective to coat the submerged parts of the outer skin with copper alloy to prevent the adhesion of marine organisms, but in this type of ships that prevent marine organisms from adhering, it is necessary to minimize the corrosion and wear and tear of the copper alloy material. While reducing the size is economically important, there is a contradictory demand that it is important to corrode the copper alloy and generate a large amount of copper ions on the outer plate surface in order to prevent marine organisms from adhering to it.

In order to resolve these contradictory demands, it is necessary to apply cathodic protection to the outer skin while sailing and to stop cathodic protection when at anchor, but since the ship is huge and unpainted, it is necessary to make the current distribution uniform. For cathodic protection to be effective, the anodes must be placed far apart, as discussed in connection with FIG. 4, which then leads to the supply voltage problem, as discussed earlier.

[Problem that the invention seeks to solve]

The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide a cathodic protection energizing device that can safely and economically energize even large objects to be protected.

[Means for solving problems]

To this end, the present invention provides a cathodic protection energizing device that supplies a low-voltage direct current to an object to be protected immersed in an electrolyte solution via a current-carrying electrode structure, in which the current-carrying electrode structure is connected to a transformer, It is characterized by being constructed as a current-carrying electrode structure formed by integrally combining a rectifier and a current-carrying electrode.

[For production]

With such a configuration, it is possible to obtain a cathodic protection energizing device that can safely and economically energize even a large object to be corroded.

〔Example〕

An embodiment in which the present invention is applied to the corrosion protection of a ship that prevents marine biofouling will be explained with reference to the drawings. Fig. 1 is a side view thereof;
FIG. 2 is an equivalent electrical circuit diagram of FIG. 1.

In the above figure, 1 is a marine biofouling prevention type vessel, 2 is an anode structure, and 3 is an insoluble anode. Rectifier 4. It is constructed by integrally combining step-up transformers 5, and has a watertight structure except that the insoluble anode 3 is immersed in seawater.

In such a device, the voltage of the energized line passing through the hull, that is, the secondary voltage v2, is maintained at a low voltage that is safe for the human body,
A high voltage is applied to the anode structure, and current distribution on the hull skin can be maintained uniformly by energizing from a remote anode.

When the ship is at anchor, the anode section is stored in the stern of the ship. For example, a winch 14 for winding up the current-carrying wire 6.8 is provided at the stern of the ship.

Although the required voltage setting is not shown, it can be automatically controlled using means such as measuring the potential of the hull outer plate.

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

(1) It is possible to reduce the voltage to water between the hull and the anode current-carrying line, increasing the safety of the device.

(2) Free setting of voltage allows cost reduction by reducing the area of the expensive anode.

〔Effect of the invention〕

In short, according to the present invention, in a cathodic protection energizing device that supplies a low voltage direct current to an object to be protected immersed in an electrolyte solution via a energizing electrode structure, the energizing electrode structure is connected to a transformer. By constructing a current-carrying electrode structure formed by integrally combining a rectifier and a current-carrying electrode, a cathodic protection current-carrying device that can safely and economically energize even large objects to be protected is obtained. The invention is extremely useful industrially.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing a known cathodic protection procedure for a marine organism-preventing ship according to the present invention. ■... Ship, 2... Anode structure, 3... Insoluble anode, 4... Rectifier, 5... Step-up transformer, 6,7°... Current-carrying line, 9... AC power supply, 10...corrosion protection current,
11... Earth, 12... Electrolyte solution, 13...
Copper alloy material, 14...Winch, vl...Primary voltage, V2...Secondary voltage, v3...
Anode voltage (vs. water voltage) Sub-agent Patent attorney Masafumi Tsukamoto Figure 3, V Figure 4 Procedural amendment clerk Display of case 1985 Patent application No. 268680 2 Title of invention Cathodic protection energizing device 3 Amendment Relationship with elderly cases Applicant postal code 100 Address 1-1, 2-5 Marunouchi, Chiyoda-ku, Tokyo Name (620) Mitsubishi Heavy Industries, Ltd. 4 Sub-agent postal code 160 Address Odakyu, 5-3 Minamimotomachi, Shinjuku-ku, Tokyo Shinanomachi Condominium No. 205 Room 5 Date of amendment order February 5, 1986 6 Subject of amendment Drawing 7 Contents of amendment The plan is amended as shown in the attached sheet.

Claims (1)

[Scope of Claims] In a cathodic protection energizing device that supplies a low-voltage direct current to an object to be protected immersed in an electrolyte solution through a energizing electrode structure, the energizing electrode structure is connected to a transformer, 1. A cathodic protection energizing device characterized by being configured as a energizing electrode structure formed by integrally combining a rectifier and a energizing electrode.