JP3380985B2 - Electrodes in cathodic protection system with external power supply - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an electrode in an external power supply type cathodic protection system. 2. Description of the Related Art A cathodic protection system using an external power source, that is, a method for suppressing corrosion of a metal, includes a method in which the direction of a galvanic current in a corrosion battery is reversed by an external current. In other words, when direct current is applied to the anode made of platinum, graphite, cast iron, aluminum, and other economically advantageous materials, galvanic current flows back from the steel, and the steel acts as a protective cathode to suppress metal corrosion. But
The anode electrode here is usually attached to the surface of the target structure (steel) via a double-sided adhesive. [0003] In the above-mentioned anode electrode, situations often occur in which a basic cathodic protection effect cannot be obtained. That is, although it is a structural problem, the electrode mounting position becomes more convex than the surface of the anticorrosion object construction,
The water film generated on the surface of the electrode from the surface water film of the anticorrosion object or the electrode base itself does not have a water retention ability due to a water repellent material (surface cover body) or the like, and the water film does not dry quickly, so that the anticorrosion current becomes difficult to flow and the electrode The water film remaining on the surface of the anticorrosion object structure that has been cut off becomes an electrolyte and corrosive action occurs. (Generally, when metal corrosion starts, moisture and other substances that become the electrolyte react electrochemically to corrode. In the case of atmospheric corrosion, the relative humidity increases due to condensation, rainfall, fog, etc., and the corrosion rate increases when a water film of 1 μm or more exists as a water film). SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electrode in which a break in a water film on the electrode side is eliminated so that an electrolytic protection effect can be reliably maintained. To provide. In order to achieve the above object, the electrode in the external power supply type cathodic protection system of the present invention is made of an insulating porous material and has a large surface area and a water-retaining board-like body. The upper surface of the front cover body and the receiving member of the same shape made of an insulating water-repellent material made of a disc-like body, between the lower confronting members, where the center of the front cover body is waterproofed to a through-hole. A current controller with a lead wire and a connector is embedded and fitted, and a linear platinum-titanium electrode led from the current controller is inserted into a guide groove engraved on the opposed peripheral edge of the upper and lower facing members. It is to be sandwiched along the uniform circumference. Since the power supply unit is always energized from the power supply unit to the platinum titanium electrode through the lead wire connector and the current controller, the anticorrosion object structure and the platinum titanium electrode become wet due to dew condensation, rainfall, fog and the like. When this occurs, a water film is formed on the surface of the electrode, which is continuous with the surface of the anticorrosion object structure, and an anticorrosion current flows from the platinum titanium electrode. Since the surface cover body of the electrode is porous and has a large surface area, the water retention capacity is secured, and the electrode cover body does not dry faster than the surface of the anticorrosion object building. There is a water-repellent material receiving member on the lower side, and a water film is formed that passes through the platinum-titanium electrode wrapped around the perimeter without water soaks and connects to the surface of the anticorrosion purpose building, so that the anticorrosion current flows and the anticorrosion purpose is continuously achieved Is done. An embodiment of the present invention will be described with reference to FIGS. An electrode 1 according to the present invention comprises a surface cover 2 made of an insulating porous material and made of a disk-shaped body having a large surface area and having a water-retaining ability, and a receiving member made of a disk-shaped body made of an insulating water-repellent material. 3
A current controller 6 with a lead wire and a connector 5 having been waterproofed in a through hole 4 perforated in the center of the front cover body 2 is embedded and fitted between the upper and lower facing members 2 and 3, and A linear platinum-titanium electrode 7 led from the current controller 6 is uniformly circumscribed along guide grooves 8 and 9 formed on the opposing peripheral side edges of the upper and lower opposing members 2 and 3. It is intended to be sandwiched. For easy attachment to the anticorrosion object structure 11, a double-sided adhesive layer 12 is provided on the lower surface of the receiving member 3 required for this type, and the upper and lower opposing members 2, 3
It has mounting holes 13 penetrating vertically on the left and right. Since the present invention is configured as described above, it is possible to eliminate anticorrosion failure due to loss of a water film from an electrode, which is extremely significant in anticorrosion of a structure (steel).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view of an electrode of the present invention. FIG. 2 is a longitudinal sectional view of the electrode of the present invention. FIG. 3 is a development explanatory view of the electrode of the present invention. FIGS. 4A and 4B are explanatory diagrams showing the relationship between the electrode of the present invention and a connection member of a current controller, and the relationship between the electrode and a receiving member. DESCRIPTION OF SYMBOLS 1; electrode 2; surface cover 3; receiving member 4; through hole 5; lead wire connector 6; current controller 7; platinum titanium electrodes 8 and 9; guide groove 10; Object construction 12; double-sided adhesive layer 13; mounting hole

Claims (1)

(57) [Claims] 1. A surface cover body made of an insulating porous material and made of a disk-shaped body having a large surface area and a water retention ability, and a disk-shaped body made of an insulating water-repellent material having the same shape as this. A current controller with a lead wire and a connector which has been waterproofed in a perforated hole in the center of the front cover body is fitted between the upper and lower confronting members with the receiving member. A linear platinum-titanium electrode led from a container is sandwiched around a uniform circumference along a guide groove cut on the opposite peripheral side edge of the upper and lower facing members. Electrodes in cathodic protection system using power supply material.