JPH1143790A - Current controller for electrical rust prevention - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a current controller for an electrical rust prevention which supplies an effective safe and harmless rust preventive current to an electrolyte, such as water, in order to protect a metallic member which comes into contact with the electrolyte against rust formation. SOLUTION: The current controller 10 is housed in a main body case 11 and has a power source cord 12 and plural pieces of output wiring 13 to respective electrodes. An operation section 15 in a cap 14 with latching 22 is provided with a power source switch 16, a voltage changeover switch 17, a display section 18, a display switch 19, a channel selector 20, a fuse holder 21, etc., which are bolted by bolt holes 23. A digital or analog output current value may be monitored in the display section 18 and the output current value of every output wiring, the total current value to the entire electrode, etc., may be checked by the channel selector 20. The currents supplied from the current controller to the respective electrodes are as extremely slight as <=350 mA at the most and the controller is entirely safe and harmless to the human and animals. Since the ionization is prevented by replenishing the metallic members with electrons by energization, the generation of the rust is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current control device for electronic rust prevention, and more particularly to a current control device for electronic rust prevention suitable for protecting metal members in contact with an electrolyte such as water from rust. About.

[0002]

2. Description of the Related Art In general, metal members that come into contact with an electrolyte such as water include a large number of metal members used for piping such as water supply and cooling / heating, and steel structures such as steel towers and bridges exposed to the weather. is there. It is known that such metal members rust due to moisture. The mechanism of this rusting is due to an electrochemical reaction, in which electrons contained in the metal
Metal ions are ionized by being deprived by an electrolyte such as water and hydroxide ions OH generated by the deprived electrons
It becomes rust by reacting with ~. In particular, oxygen dissolved in water accelerates these phenomena, and a lot of rust is generated at the corner where the flow of the pipe changes and at the connection part of the parts. Also, if there is a dissimilar metal with a noble potential in contact with water,
Electrons of a metal with a low potential are deprived by a dissimilar metal with a noble potential and are dissolved in the electrolytic solution, so that corrosion of the metal with a low potential proceeds.

By the way, for example, rust and corrosion of water pipes appear as follows. Aging of pipes first appears in water quality, and changes in water color, smell, taste, etc. When rust is generated in the pipe, the water becomes red and cloudy, and the taste becomes astringent. In addition, in hot water supply facilities, bath water appears red, laundry becomes dirty, and water in the washroom becomes dirty.

The mechanism of rust generation is described electrochemically using iron as an example as follows. 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]

Rust-preventive coating is usually applied to steel structures exposed to wind and rain outside, but rust cannot be completely prevented. There are countless small holes and scratches called pinholes on the painted surface, and moisture penetrates from these holes and scratches, and rust begins to progress from the boundary between the paint and the metal. Even the smallest rust is usually several times larger inside the paint.
Especially near the sea and in industrial areas, rust progresses quickly due to salt and chemicals. Rust not only impairs aesthetics, but also affects durability and safety. There is a method of applying or spraying chemicals on rust preventive treatment for painted objects, but there is a risk of peeling off, having a bad effect on the human body and the environment, and painting is important for aesthetics It was hard to say that it was suitable.

[0010] In the case of piping, it is difficult to coat the inner wall of the pipe, and there are the following rust prevention methods, but each has its own problems. The chemical mixing method is a method of injecting a chemical into water to form a film on the inner wall of the pipe and preventing rust by preventing contact with water and metal.However, since the chemical is used every few months, the cost is high. In addition, it is necessary to pay attention to the effect of the medicine on the human body or the influence of the medicine on piping and instruments. The lining method is a method of spraying sand particles etc. into the pipe to remove deposits, forming a film on the inner wall of the pipe, preventing rust by preventing water and metal from contacting, but processing it for threaded parts and pumps No, it is not decisive because rust and water leaks occur from these places. The deaeration method is a method of reducing oxygen dissolved in water and suppressing oxidization reaction to prevent rust. However, since the motor is rotated, electricity cost and maintenance cost are required, and the cost is high.

An object of the present invention is to provide a safe and harmless rust preventive current through an electrolytic solution to protect a metal member which rusts upon contact with an electrolytic solution such as water from rusting. It is to provide a current control device.

[0012]

The above object is achieved as follows. The current control device for electronic rust prevention according to the first aspect of the present invention, through an electrolytic solution such as water contacting the metal member,
The rust prevention current supplied to the metal member is controlled to a weak DC current. According to such a configuration, electrons are supplied to the metal member by the direct current rust prevention current flowing through the electrolytic solution. Rust is generated by the reaction of hydroxide ions OH ~, which are generated by the electrons of the metal with the electrolyte and the metal which is deprived of the electrons, with the metal ionized by the deprived electrons. By replenishing electrons, metal ionization is prevented,
Therefore, rust generation and progress are suppressed. Since this rust preventive current is controlled to a weak DC current, a sanitary rust preventive current that is safe and harmless to humans and animals is supplied. According to the second aspect of the present invention, since the weak DC rust preventive current is obtained by converting a current from an AC power supply, installation work such as installation is simple, cost is low, and maintenance is good.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a current control device for electronic rust prevention of the present invention. The current control device according to the present embodiment is used for preventing rust of a metal water supply pipe or the like of a large-scale condominium or the like. Is converted to and controlled.

As shown in FIG. 1, a current control device 10 according to the present embodiment is housed in a main body case 11 and is connected to a power supply cord 12 connected to an AC power supply. Wiring 1 to each electrode to energize
3 are provided. A lid 14 made of a transparent resin is provided on the upper part of the main body case 11, and an operation unit 15 in the lid 14 is provided with power switches 16 and 100 for turning on power.
Voltage switch 17 for switching between V, 200 V, 220 V, etc., and a display unit 1 for displaying an output current value, an input voltage, etc.
8, a display switch 19, a channel selector 20 for detecting an output current value to each wiring, etc., a fuse holder 21 provided with a fuse for protecting the device from overvoltage or overcurrent, and a lid 14 can be easily opened. A lock 22 provided so as not to be provided, a bolt hole 23 for fixing a bolt so that the main body case 11 does not move, and the like are provided.

The current control device according to the present embodiment is devised as follows. A display unit 18 for monitoring a digital or analog output current value is mounted on the main body case 11. It is indicated by an on / off switch to prevent power consumption. The channel selector 20 is provided, and the output current value for each output wiring can be checked, and the total current value to all the connected electrodes can be checked. The power supply indicator lamp 24 is mounted so that it is always possible to confirm that the power is turned on. An indicator lamp can be built into the power switch. The fuse holder 21 is attached to the operation unit 15 so that the fuse can be easily replaced without disassembling the main body case when the fuse is broken. A lockable lid-attached main body case 11 is employed to protect the output current display monitor, switches, fuse holder, etc. of the operation unit 15.

In this embodiment, 1 to 20 electrodes can be attached to one output wiring as required. As a result, the number of wires can be reduced, and construction costs and material costs for on-site installation work can be reduced. Although not shown, the current control device 10 can be reliably connected to a ground from a pipe. The rust preventive current supplied to each electrode is at most 350 mA at most, and is extremely weak, and is completely safe and harmless to humans and animals.
Further, the illustrated example is an example, and the shape and size are not limited to those shown in the drawings as long as functions are provided as needed.

Next, the rust prevention effect of the current control device of the present embodiment will be described. FIG. 2 is an explanatory diagram showing an example in which the present device is applied to a water supply pipe. As shown in FIG.
The current controller 10 includes an electrode unit 31 that supplies a weak DC current to water in the inside, a current control device 10 that supplies a weak current to the electrode unit 31, and an earth 32 connected to the pipe 30. It is connected to a general AC power supply 33, and the ground 32 is also connected. The electrode part 31 is attached to an arbitrary pipe connection part, and in this example, the electrode terminal is brought into contact with water in a water passage hole at the center of the disc-shaped insulated electrode holder sandwiched between the pipe connection parts. It is exposed and attached to. Further, a plurality of output wirings 13 are provided according to the scale of the piping equipment.

In this embodiment, a general alternating current from a power supply is controlled by a current controller to a weak direct current of at most 350 mA and supplied to the electrodes. In the electrodes, the supplied current is reduced by a limiter to a weak current of several mA to several tens mA depending on the electrolytic solution and other conditions, and the current is supplied to the water. The electrons move in the direction opposite to the flow direction of the weak current, the electrons are supplied to the pipe via the ground, and the ionization of the metal is prevented. Therefore, rust generation and progress are suppressed. Further, the rust preventive current to be supplied is an extremely weak current, and is a current value that can be completely ignored in reality, and does not have any adverse effect on the human body in work and in real life.

FIG. 3 is a diagram for explaining the effects of another application of the present apparatus. This example compares the durability between the method of passing a weak rust-preventive current by the current control device of the present embodiment to a steel material exposed to the wind and rain in a salty coastal area, and the conventional method using only painting. FIG.
The horizontal axis shows the service life and the vertical axis shows the durability of the coating in percentage. Although the durability of the coating varies depending on the environment in which it is used, as shown in the figure, the durability decreases with the number of years, and it is said that the normal coating A alone takes about 2 to 5 years. It is necessary to change the coating every certain period. However, according to the coating B to which the method of the present invention is applied, the durability is improved, and as shown in the figure, the service life is almost doubled, so that the cost is reduced. It can be seen that maintenance is also improved.

[0020]

As described above, according to the present invention, in order to protect a metal member that rusts when it comes into contact with an electrolyte such as water from rust, the current supplied to the electrode is at most 350 m.
Since the current is controlled to a very weak current of A or less, it is a current value that can be completely ignored in reality.
Has no adverse effect on the human body. In addition, a single AC power supply can supply a weak current to a large number of electrodes, and a current control device for electronic rust prevention excellent in maintenance, construction work, running cost, safety, and the like can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a current control device for electronic rust prevention of the present invention.

FIG. 2 is an explanatory diagram showing an example in which the device of the present invention is applied to a water supply pipe.

FIG. 3 is a diagram for explaining an effect of another application example of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Current control device for electronic rust prevention 11 Main body case 12 Power cord 13 Output wiring 14 Lid 15 Operation part 16 Power switch 17 Voltage switch 18 Display part 19 Display switch 20 Channel selector 21 Fuse holder 22 Locking 23 Bolt hole 24 Power supply lamp 30 Piping 31 Electrode part 32 Earth 33 General AC power supply

Claims (2)

[Claims] 1. A current control device for electronic rust prevention, wherein a rust prevention current applied to said metal member is controlled to a weak DC current through an electrolyte such as water which comes into contact with the metal member. . 2. The current control device for electronic rust prevention according to claim 1, wherein the weak DC rust prevention current is obtained by converting a current from an AC power supply.