JPH0961395A - Reference electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably hold the natural potential of an electrode body without separately providing a power source by covering the liquid contact surface of the electrode body with an insulating material-made lid having a number of openings. SOLUTION: The reference electrode 11 is formed out of a disc type supporting insulator 12, a silver-silver chloride electrode body 13 fixed to the central part of the surface of the insulator 12, and an insulating material-made lid 16 having a number of small hole-like openings 16a, the lid being integrally provided so as to cover the electrode body 13. Since the liquid contact surface of the electrode body 13 is covered with the insulating material-made lid 16 having a number of openings 16a, the flow of seawater on the electrode body surface within the lid is moderated, compared with the outer surface of the lid, and the dropping-out of the silver chloride film can be thus prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reference electrode used in an automatic cathodic protection system for a metal structure such as a ship outer plate.

[0002]

2. Description of the Related Art As shown in FIGS. 1 and 2, a reference electrode 1 generally used in the above-mentioned automatic cathodic protection system is, for example, a disk-shaped supporting insulator 2 and this insulator 2.
The electrode body 3 made of silver-silver chloride having a diameter of about 50 mm, which is fixed to the central portion of the front surface of the above, the mounting bracket 4 having the male screw integrally projected on the central portion of the rear surface of the insulator 2, and the electrode body 3 It is composed of a connected insulated wire 5 that is connected and that extends from the insulator 2 through the mounting bracket 4 to the outside. A waterproof resin is filled in the mounting bracket 4.

[0003]

By the way, when the conventional reference electrode 1 is attached to the hull outer plate, a large dynamic pressure due to the flow velocity of seawater is directly applied to the surface of the electrode body 3 during navigation of the ship. Since the silver chloride film on the surface of the electrode body 3 is partially removed by dynamic pressure and the silver surface of the underlying silver chloride is exposed, the intrinsic potential of the electrode body 3 fluctuates in the base potential direction, resulting in an error in the measured value. Was occurring.

In order to prevent such a measurement error, it was necessary to separately prepare a power source and supply a weak current to the electrode body 3 to compensate for the loss of the silver chloride film.

Further, as shown in FIG. 3, there is also a reference electrode in which a groove 2a is provided in the inclined surface of the insulator 2, for example, in the vertical and horizontal planes, and a means for relaxing the dynamic pressure on the surface of the electrode body 3 is provided. However, this is not enough to prevent the silver chloride film on the surface of the electrode body 3 from partially falling off, and as described above, the intrinsic potential of the electrode body 3 fluctuates in the base potential direction, resulting in an error in the measured value. Therefore, it was necessary to separately prepare a power source and flow a weak current to the electrode body 3.

FIG. 4 shows the electrode body 3 of the first conventional example (FIG. 1).
4 is a graph showing the fluctuation of the potential in FIG. 4 and the fluctuation of the potential in the electrode body 3 of the second conventional example (FIG. 3).

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the problems of the above-mentioned conventional reference electrode, and the gist of the present invention is to fix the electrode body on the surface of the supporting insulator. In the collation electrode integrally configured as described above, the liquid contact surface of the electrode body is covered with an insulating lid having a large number of openings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 5 shows a first reference electrode of the present invention.
FIG. 6 is a front view showing an embodiment, and FIG. 6 is a vertical sectional view of FIG.
The reference electrode 11 comprises a disk-shaped supporting insulator 12, an electrode body 13 made of silver-silver chloride having a diameter of about 50 mm fixed to the center of the surface of the insulator 12, and the center of the back surface of the insulator 12. A mounting bracket 14 having a male screw integrally projecting to the electrode, an insulated wire 15 for connection, which is connected to the electrode body 13 and is pulled out from the insulator 12 through the mounting bracket 14 to the outside. body
On the surface of 12, an insulating lid 16 having a large number of small hole-shaped openings 16a is integrally provided so as to cover the electrode body 13. The fitting 14 is filled with waterproof resin. FIG. 7 is a front view showing a second embodiment of the matching electrode of the present invention. An insulator lid having openings 26a in a grid pattern on the surface of the insulator 22 of the matching electrode 21.
26 may be provided, and FIG. 8 is a front view showing a third embodiment of the matching electrode of the present invention. Insulation having mesh openings 36a on the surface of the insulator 32 of this matching electrode 31. Product lid
36 may be provided, and these openings are not limited to each embodiment, and various shapes such as a slit-shaped opening may be adopted outside the scope without changing the gist of the present invention. You can

[0009]

According to the reference electrode of the present invention described above,
Since the liquid contact surface of the electrode body is covered with an insulating lid having a large number of openings, the flow of seawater on the surface of the electrode body inside the lid is gentler than that on the outer surface of the lid, and thus chloride Since it is possible to prevent the silver film from falling off, it is possible to stably maintain the intrinsic potential of the electrode body without separately preparing a power source as in the conventional case. This stable holding state of the intrinsic potential is also shown in the graph of FIG.

[Brief description of drawings]

FIG. 1 is a front view showing a reference electrode of a first conventional example.

FIG. 2 is a vertical cross-sectional view of the reference electrode shown in FIG.

FIG. 3 is a front view showing a reference electrode of a second conventional example.

FIG. 4 is a graph showing a change in potential in each electrode body of the first conventional example, the second conventional example, and the embodiment of the present invention.

FIG. 5 is a front view showing a reference electrode according to the first embodiment of the present invention.

6 is a vertical cross-sectional view of the reference electrode shown in FIG.

FIG. 7 is a front view showing a reference electrode according to a second embodiment of the present invention.

FIG. 8 is a front view showing a reference electrode according to a third embodiment of the present invention.

[Explanation of symbols]

11, 21, 31 Reference electrode 12, 22, 32 Supporting insulator 13, 23, 33 Electrode body 14 Mounting bracket 15 Insulated wire for connection 16, 26, 36 Insulator lid 16a, 26a, 36a Open

Claims (1)

[Claims] 1. A collation electrode in which an electrode body is fixed to a surface of a supporting insulator to be integrally formed, and a liquid contact surface of the electrode body is covered with an insulating lid having a large number of openings. Characteristic matching electrode.