JPH07268700A - Electrolytic rust removing method of metal and device therefor - Google Patents

Abstract

PURPOSE:To obtain a method and device for electrolytically polishing without using a large electrolytic vessel. CONSTITUTION:An electrolytic solution vessel 17 is formed by connecting another pole of electric source 30, one pole of which is connected to a material 12 to be rust removed, to an electrolytic solution holding tool 15 and holding the electrolytic solution in a water permeable material. The rust is removed by allowing the electrolytic solution vessel 17 to be in contact with a part of the rust of the material 12 to be rust removed and in the device, the electric source 30 is connected to the material to be rust removed at one pole and to the electrolytic solution holding tool at another pole and the electrolytic solution holding tool 15 is formed from the water permeable material to hold the electrolytic solution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rust remover suitable for removing a relatively thin rust formed around a welded portion of metal, mainly stainless steel, and particularly to electrolytically removing the rust. For a simple device for.

[0002]

2. Description of the Related Art Conventionally, in order to remove scales formed on the surface of a metal once heated by casting or heat treatment, these are immersed in an electrolytic cell filled with an electrolytic solution and energized to electrochemically remove rust. There are known methods for removing rust.

[0003]

However, even if the rust of a thick duct or a large-area member used in a flue of a chemical plant or an incinerator is relatively thin and easy to remove, those members are accommodated. It is almost impossible to construct a large-sized electrolytic cell that can be done, and in the end, it has been unavoidable to remove it by a small rust removing means such as a grinder or sandblast.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a method therefor is to provide an electrolytic solution supply port that opens to the outside in an electrolytic solution container that contains the electrolytic solution, and to supply the supply port. A limiting means for limiting the flow of the electrolytic solution is arranged in the flow path leading to, and the electrolytic solution flowing out from the supply port is brought into contact with the rusted portion of the material to be rusted and energized. Connect the material to be rusted to one pole of the power supply, connect the electrode provided in the electrolytic solution container to the other pole, provide a supply port that opens to the outside of the container, and the electrolytic solution in the flow path leading to the supply port. A limiting means for limiting the flow of the electrolyte solution is provided, and if necessary, a tray for the electrolytic solution is provided below the supply port.

[0005]

[Function] When the electrolytic solution container is brought close to the material to be rusted and the internal electrolytic solution is discharged onto the rust, the amount of the electrolytic solution is limited by the restricting means from a relatively wide mouth to a wide area. Supplied. Therefore, the surface of the rust is wetted in a large area by the electrolytic solution, and the wetted surface is in the same state as when it is immersed in the electrolytic solution. When electricity is applied in that state, the rust is ionized from the material to be removed and a current flows between the electrode supported on the holder and the material to be removed, leaving the material to be removed and passing through a thin layer of electrolyte. Attracted to the electrodes in the holder.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, reference numeral 10 is a metal electrolysis rusting device used for carrying out the present invention. The electricity releasing rust device 10 includes an electrolytic solution holder 15 for rubbing and removing rust to be removed, that is, a rust portion generated on the material to be rusted 12, and a DC power source 30 for supplying power thereto. Is equipped with. Electrolyte holder 1
The 5 is made portable so that it can be held and operated by hand. Further, one pole of the DC power source 30 is connected to a stainless member that is the material to be rusted 12, and the other pole is connected to the electrolytic solution holder 15.

The electrolytic solution holder 15 is an insulator having a thickness of about 20 mm, that is, a cylindrical container 17 made of synthetic resin.
And an electrode 19 made of a stainless material inserted coaxially therethrough, and an annular electrolytic solution chamber 20 is formed between them. One end of the container 17 is sharpened outward, and a supply port 21 for discharging the electrolytic solution is opened in the sharpened portion. The other end is sealed by a lid 23, and the rear end of the electrode 19 penetrates through the lid 23 and protrudes to the outside, and is supported by the lid 23.

The tip of the electrode 19 is pointed in a conical shape so that it can move forward and backward so as to face the rear surface of the supply port 21. That is, the male screw 24 is provided at the rear end of the electrode 19.
a is cut, and the male screw 24a is screwed to the female screw formed on the lid 23. Reference numeral 24b is an adjusting knob provided at the rear end of the electrode 19. 23c is the adjusting knob 24b
It is a lock nut for keeping the position locked after adjusting. Thus, by rotating the adjusting knob 24b, the tip end article of the electrode 19 advances and retreats with respect to the rear surface of the supply port 21, and forms a throttle valve T that changes the cross-sectional area of the flow path formed between them. ing. In addition, this throttle valve T
Acts as a limiting means for limiting the flow of the electrolytic solution.

The electrolytic solution chamber 20 communicates with an electrolytic solution tank 26 through a passage 25 drawn out through a lid 23, and the electrolytic solution is supplied by a pump 27 during operation. . 29 is a tray for receiving the electrolytic solution flowing down from the supply port 21. The tray 29 is formed integrally with the electrolytic solution tank 26, and is inclined so that the electrolytic solution flows toward the tank 26 side. The receiving tray 29 is not limited to this example, and may be formed integrally with the above-mentioned electrolytic solution holder 15 and connected to the tank 26 through a flexible pipe. In this case, the receiving tray 29 is always electrolytic. Since it moves integrally with the liquid holder 15, even if it is made relatively small, the electrolytic solution can be reliably received.

Next, the DC power supply 30 will be described. The DC power supply 30 has a transformer 32. The primary winding 33 of the transformer 32 is connected to a commercial power source of 100 V or 200 V, and the AC power stepped down to 20 V is taken out to the secondary winding 34 side. A bridge 35 formed by connecting four diodes is connected to the secondary winding 34 side, and the pulsating current rectified by both waves is smoothed by a high-capacity smoothing capacitor 36 of 10000 μF and output as a direct current.
The triac 37 inserted in the primary side is an element for shutting off the primary side when the secondary side is short-circuited. 38 is a DC voltmeter and 39 is a DC ammeter.

Here, a leakage flux type is used for the transformer 32. The leakage flux type transformer 32 is one in which a short-circuited magnetic path m is provided in a magnetic path M connecting a core 33a wound around a primary winding 33 and a core 34a wound around a secondary winding 34. Is. Thus, the leakage flux type transformer 21 has the secondary winding 3
While a normal current is flowing to the 4 side, it does not operate differently from a normal transformer, but once the secondary winding 34 side is short-circuited and the current increases, the magnetic path resistance increases, so The magnetic change generated by the winding 33 passes through the short-circuit magnetic path m, and the voltage induced in the secondary winding 34 drops extremely. That is, when the secondary winding 34 is short-circuited, the impedance of the secondary winding apparently appears to be very high, and damage to the transformer 32 due to overcurrent is prevented. The output voltage drop characteristic of the transformer 32 is as shown by the solid line in FIG. 3, and the broken line shows the range in which the characteristic can be changed.

Next, a method of using the apparatus of the above embodiment will be described. First, a power source is connected to the material to be rusted 12, and then the pump 27 is operated to fill the electrolytic solution chamber 20 of the electrolytic solution holder 15 with the electrolytic solution. In this state, the supply port 2 of the electrolytic solution holder 15
When 1 is flowed toward the rust of the material to be removed 12, current flows through the electrolytic solution, and the rust disappears due to an electrochemical reaction.

At this time, by rotating the adjusting knob 24b forming the throttle valve T, the flow rate of the electrolytic solution is adjusted to the minimum flow rate required to cover the rust range. That is, in this embodiment, the throttle valve T constitutes the electrolytic solution limiting means. Thus, the electrolytic solution discharged from the supply port 21 covers the surface of the rust of the material to be rusted 12, and after electrolytically removing it, a part is evaporated by the heat of reaction but the remaining part is the lower tray 29.
And is collected in the electrolytic solution tank 26.

A large amount of the electrolytic solution discharged from the supply port 21 and recovered from the tray 29 significantly reduces workability. When the adjusting knob 24b is operated to reduce the flow rate of the electrolytic solution, the area covered with the electrolytic solution tends to decrease, and an electrolytic solution holder 15 improved in that respect is shown in FIG.
In FIG. 4, the electrolytic solution holder 15 has a brush-like brush 22 made of a bundle of ceramic fibers including glass fibers, instead of the throttle valve T as a limiting means. It's different. In this embodiment, the rear end of the electrode 19 made of stainless steel is connected to the DC power supply 30 by an electric wire made of copper wire through a connecting fitting. Reference numeral 23a is a rubber cover that covers the connection between the electrode and the electric wire. Also,
Reference numeral 25a is a bolt-shaped lid that closes the electrolyte passage 25 that opens to the side of the container 15.

In this embodiment, when the brush 22 is in contact with the surface of the rusted material 12, the electrolytic solution is supplied to the rust of the rusted material 12 through the brush 22. That is, the electrolytic solution covers the surface of the material to be rusted 12, and a part of the electrolytic solution is consumed there. Along with this, new electrolytic solution is replenished from the brush 22. Further, when the brush 22 is separated from the surface of the material to be rusted 12, the electrolytic solution remains in the brush 22 due to the effect of the surface tension, and the outflow is minimized. Although the area of the supply port is increased and the area of the material to be rusted 12 is increased in this manner, the outflow amount of the electrolytic solution can be limited.

If the limiting means limits the flow rate of the electrolytic solution passing through the supply port, the throttle valve T and the brush 2
The number is not limited to 2, and may be attached to the supply port as a container-shaped thick film made of porous ceramics.

[0017]

As described above, according to the present invention, the material to be rusted 12 is removed.
Discharge the electrolytic solution from the electrolytic solution holder 15 on the rust of
Material to be removed rust 1 because it removes rust electrochemically
No need for a large electrolyte bath or electrolyte for dipping 2
The cost required for rust removal can be significantly reduced. Further, since the electrolytic solution limiting means is provided in the portion of the electrolytic solution holder 15 where the electrolytic solution is discharged, the electrolytic solution is temporarily held in that part, so that the flow rate of the electrolytic solution can be reduced.
In addition to improving the operability of No. 5, the electrolytic solution does not scatter around the workplace, and the environment can be kept clean.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electric release rust device showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part showing another embodiment.

FIG. 3 is a circuit diagram of a power supply.

FIG. 4 is a characteristic diagram showing the output voltage characteristic.

FIG. 5 is an external view showing a conventional rust removal method.

[Explanation of symbols]

 10 ... ・ Electrolytic release rust device 12 ・ ・ ・ ・ ・ ・ Rusted material 15 ・ ・ ・ ・ Electrolyte holder 17 ・ ・ ・ ・ Cylindrical container 19 ・ ・ ・ ・ ・ ・ Electrode 20 ・ ・ ・ ・ ・ ・ Electrolyte chamber 21 ... Supply port 22 ... Brush 23 ... Lid 23a ... Cover 23c ... Lock nut 24a ... Male screw 24b ... Adjusting knob 25 ... Passage 26 ...・ ・ ・ Electrolyte tank 27 ・ ・ ・ ・ Pump 29 ・ ・ ・ ・ ・ ・ Sauce 30 ・ ・ ・ ・ DC power supply 32 ・ ・ ・ ・ Transformer 33 ・ ・ ・ ・ ・ ・ Primary winding 33 a ・ ・ ・ Primary winding core 34・ ・ ・ Secondary winding 34a ・ ・ ・ Secondary winding core 35 ・ ・ ・ ・ Bridge 36 ・ ・ ・ ・ Smoothing capacitor 37 ・ ・ ・ ・ Triac 38 ・ ・ ・ ・ ・ ・ DC voltmeter 39 ・ ・ ・ ・ ・ ・ DC Ammeter M: Magnetic path m: Short circuit magnetic path T: Throttle valve

[Procedure amendment]

[Submission date] August 11, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electric release rust device showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part showing another embodiment.

FIG. 3 is a circuit diagram of a power supply.

FIG. 4 is a characteristic diagram showing the output voltage characteristic.

[Explanation of reference numerals] 10 ... Electrolytic release rust device 12 ... Rust-removed material 15 ... Electrolyte holder 17 ... Cylindrical container 19 ... Electrode 20 ...・ ・ Electrolyte chamber 21 ・ ・ ・ ・ Supply port 22 ・ ・ ・ ・ ・ ・ Brush 23 ・ ・ ・・ ・ Passage 26 ・ ・ ・ ・ Electrolyte tank 27 ・ ・ ・ ・ Pump 29 ・ ・ ・ ・ Saucet 30 ・ ・ ・ ・ DC power supply 32 ・ ・ ・ ・ ・ ・ Transformer 33 ・ ・ ・ ・ ・ ・ Primary winding 33a ・ ・ ・ Primary Winding core 34 ... Secondary winding 34a ... Secondary winding core 35 ... Bridge 36 ... Smoothing capacitor 37 ... Triac 38 ... DC voltmeter 39・ ・ ・ ・ DC ammeter M ・ ・ ・ Magnetic path m ・ ・ ・ Short-circuit magnetic path T ・ ・ ・ Throttle valve

Claims (6)

[Claims] 1. An electrolytic solution supply port that opens to the outside is provided in an electrolytic solution container that contains the electrolytic solution, and a restricting means that restricts the flow of the electrolytic solution is provided in a flow path leading to the supply port. Electrolytic release rust method of metal in which the electrolytic solution flowing out of the metal is brought into contact with the rusted part of the material to be rusted to carry electricity. 2. A material to be rusted is connected to one pole of a DC power source, an electrode provided in a container of an electrolytic solution is connected to the other pole, and a supply port that opens to the outside is provided in the container and the supply port is provided at the supply port. A metal electrolytic rusting device provided with a restricting means for restricting the flow of an electrolytic solution in a communicating channel. 3. The metal electro-release rust device according to claim 2, wherein the limiting means is made of a porous member. 4. The metal de-corrosion apparatus according to claim 2, wherein the electrolytic solution container is provided below the supply port with a tray for receiving the electrolytic solution flowing out from the supply port. 5. The metal electrolysis rusting device according to claim 1 or 2, wherein the electrolytic solution holder is made of a heat-resistant material such as fine ceramic fibers or metal in a brush shape. 6. The metal electrolysis rusting device according to claim 1 or 2, wherein the electrolytic solution holder is made of a porous material in a container shape.