JPH1150277A - Electronic rust-prevention system of inner wall of tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic rust-prevention system in a tank which protects generation of rust inside a metallic tank for water, realizes the durability and long service life of the tank, and is harmless for human body. SOLUTION: A steel plate 2 of an inner wall of a steel water storage tank 1 is easy to generate rust with water 3. Electrodes 5 are mounted on electrically- insulating resin pipes 6, and an insulation-covered connection wire 7 is arranged for each electrode in the pipes. The resin pipes 6 are detached from the inner wall of the tank by support pieces 8 to avoid the electric short-circuit of the electrodes 5 to the steel plate 2. The electrodes 2 are connected to a current controller 9, and the current controller 9 is connected to an AC power source 11 through a timer 10. A grounding 12 is provided on the steel plate 12. When the timer 10 is operated, the current from the AC power source 11 is regulated to a weak DC current by the current controller 9, and further weakened by the electrodes 5 so as to be energized in water, and electrons are supplied to the steel plate 2. Generation of iron ion from the steel plate 2 is suppressed, and generation and progress of rust are suppressed thereby. A timer may be dispensed with.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic rust prevention system for a tank inner wall, and more particularly to a tank inner wall suitable for protecting the inner wall of a metal tank such as a water storage tank for storing an electrolyte from rust. Electronic rust prevention system.

[0002]

2. Description of the Related Art It can be said that the inner wall of a tank for storing an electrolyte such as water is in a state where rust is particularly likely to occur. The mechanism by which the electrolyte rusts inside the metal tank is due to an electrochemical reaction, and electrons contained in the metal such as a steel plate used for the tank are taken away by the electrolyte such as stored water. As a result, the metal is ionized and generated by reacting with hydroxide ion OH ~ generated by the deprived electrons.

Further, if there is a foreign metal having a noble potential in contact with water, electrons of a metal having a low potential are robbed by the foreign metal having a noble potential and are dissolved in an electrolytic solution. By the reaction of 3 or less, corrosion of a metal having a low potential proceeds. For this reason, a joint with a dissimilar metal or the like is likely to rust. In particular, oxygen dissolved in the electrolyte accelerates these phenomena.

[0004] As an example, the mechanism of rusting of iron in contact with water will be described electrochemically. Metals such as iron have electrons. When water and oxygen are present, the electrons of the metal are deprived and become hydroxyl ions. The iron ions that have lost the electrons and the hydroxide ions combine to form ferrous hydroxide. When water and oxygen are further supplied to ferrous hydroxide, it becomes ferric hydroxide. This is the so-called red rust. The above-mentioned mechanisms are represented by the following chemical formulas.

[0005]

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[0006]

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[0007]

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[0008]

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[0009]

There are several methods for protecting the metal inner wall of such a water storage tank from the occurrence of rust, but all have problems and cannot be said to be a definitive rust prevention method.

[0010] That is, the conventional tank inner wall is usually treated according to the use such as plating or epoxy coating, but it was not possible to completely prevent rust completely. Electrolyte penetrates through only slight scratches on the plated surface and tiny pinholes on the painted surface,
Rust occurs at the border between paint and metal. Even the smallest rust is usually several times larger inside the paint. In particular, when salt or a chemical substance is contained due to the nature of the electrolytic solution stored in the tank, the rust progresses faster due to the influence. Rust reduces the durability of the tank,
In drinking water tanks, etc., it also affects human safety.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and protects the inside of a metal tank for storing an electrolytic solution such as industrial water, disaster water, drinking water, etc. from rusting, and provides a tank. It is an object of the present invention to provide an electronic rust prevention system for the inner wall of a tank which is not harmful to the human body, while increasing the durability of the tank and extending the service life.

[0012]

In order to solve the above-mentioned problems, an electronic rust prevention system for a tank inner wall according to the present invention is made of a metal such as a steel plate and has a metal inner wall of a tank for storing an electrolyte such as water. A rust prevention system comprising rust prevention means for preventing rust, wherein the rust prevention means comprises an electrode for supplying a weak DC current to the electrolyte, and a current control for supplying the weak current to the electrode. And a ground connected to the tank. According to the present system, electrons are supplied to the inner wall of the tank by applying a weak current to the inner wall of the tank via the electrolytic solution. Rust is generated because the electrons held by the metal are deprived by the electrolytic solution and the metal is ionized, and the ionized metal reacts with hydroxide ions OH ~ generated by the deprived electrons. By supplying electrons to the metal inner wall of the tank,
The ionization of the metal is prevented, so that the generation and progress of rust on the inner wall of the tank are suppressed.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a longitudinal sectional view and a transverse sectional view of a tank equipped with an embodiment of the system of the present invention. Tank 1 equipped with this rust prevention system
This is a steel plate storage tank for storing industrial water. The steel plate 2 on the inner wall of the tank is constantly exposed to water 3 which is an electrolytic solution, so that rust is easily generated. Also,
The water level in the tank can also be improved by distributing water or refilling the tank with water.
It moves up and down and is not constant. Therefore, the electrodes 5 for applying the weak current 4 to the water in the tank are also arranged at the bottom of the tank so as to always contact the increasing or decreasing water, and an arbitrary number of the electrodes 5 are arranged in the vertical direction according to the depth of the tank. Has been installed.

The electrode 5 is mounted on an insulating resin pipe 6 with its terminal exposed so that it can come into contact with water. In the pipe, a connection wire 7 coated with insulation for each electrode is provided. Further, the resin pipe 6 is attached by a support 8 so as to be separated from the tank inner wall so that the electrode 5 does not contact the steel plate 2 or the like on the tank inner wall to cause an electrical short circuit. According to the diameter of the tank 1, in FIG. 2, three resin pipes 6 are provided. In this example, the connection line 7 for each electrode drawn out of the resin pipe 6 is connected to one current controller 9.
, And the current controller 9 is connected to an AC power supply 11 via a timer 10. An earth 12 is provided on the steel plate 2 of the tank.

When the timer 10 operates, the AC power supply 11
Current is supplied to the current controller 9 by a weak DC current (35
(0 mA or less) and sent to each electrode 5. Electrode 5
Is provided with a limiter, and a weaker current (several tens of mA or less) is supplied depending on conditions, and electricity is supplied from the electrode terminal in contact with water to the water. The weak current 4 that has been supplied to the water flows through the steel plate 2 that is grounded, and as a result, the steel plate 2
Will be replenished with electrons. Therefore, generation of iron ions from the steel sheet 2 is suppressed, and generation and progress of rust are suppressed.

In the present system, the time for supplying the weak current can be appropriately adjusted by the timer, and the weak current can be supplied only at night. However, originally, the current is extremely weak, so without a timer,
It may be energized at all times. As a power source, general alternating current, AC 100 V, AC 200 V, AC 220 V, or the like can be used. The current from the current controller is at most 3
The current is about 50 mA, and the current flowing from the electrode into the tank is several mA to several tens mA. The average standard that can be covered by one electrode is approximately 10 to 15 m ² , but cannot be said unconditionally due to installation conditions and environment. In this example, 1
Although 12 electrodes are arranged in each current controller, it is needless to say that they can be arbitrarily selected depending on the installation conditions.

According to the present system, the following operational effects are obtained. (1) Metal corrosion occurred on the inner wall of the tank, etc., due to scratches and pinholes in the conventional plating. However, this system can supply electrons to the plating scratches and the pinholes in the coating, and the metal ion Since the occurrence is suppressed, the occurrence of rust can be suppressed. (2) Rust prevention treatment using chemicals and chemicals could harm workers' health and pollute the work environment.
According to this system, rust prevention treatment is performed using a very weak electric current, so that no harm is caused to the human body and the environment. (3) The present system basically requires only relatively small electrodes and a current controller, so that the mounting operation is easy, and once mounted, it is maintenance-free for many months and the cost is low. (4) The present system is used to remove the inner wall of a metal tank for storing an electrolyte such as industrial water, disaster water, or drinking water.
Protects against deterioration due to rusting and has a wide range of applications.

[0018]

As described above, according to the present invention, the inside of a metal tank for storing an electrolyte such as water is protected from rust, the durability of the tank is increased, and the life of the tank is extended, and An electronic rust prevention system in the tank that is harmless to the human body can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a tank equipped with an embodiment of the system of the present invention.

FIG. 2 is a cross-sectional view of a tank equipped with an embodiment of the system of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water storage tank 2 Steel plate 3 Water 4 Weak current 5 Electrode 6 Resin pipe 7 Connection line 8 Support 9 Current controller 10 Timer 11 AC power supply 12 Earth

Claims (1)

[Claims] 1. A rust prevention system made of a metal such as a steel plate and provided with rust prevention means for preventing rust on a metal inner wall of a tank for storing an electrolyte such as water. An electronic rust prevention system for an inner wall of a tank, comprising: an electrode for supplying a weak DC current to the electrolyte; a current controller for supplying the weak current to the electrode; and an earth connected to the tank.