JP2788967B2 - Corrosion protection method for metal member of machine or device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]   The present invention relates to a method for preventing corrosion of corrosive substances. Further details
In other words, the mechanical energy of pressurization and heating is
The piezoelectricity or pyroelectricity generated by
Corrosive substances, especially metal parts of machinery or equipment
To a method for preventing corrosion of steel. [Conventional technology]   Conventionally, as a method of preventing corrosion,
The chemical reaction itself, such as oxygen, pH, dissolved components, etc.
It is the fact that measures are taken taking into account. [Problems to be solved by the invention]   However, measures to prevent such a chemical reaction itself, such as
Even if rust preventive paint is applied, corrosion still progresses
That is the fact.   Accordingly, an object of the present invention is to provide a novel anticorrosion method for corrosive substances.
It is to provide. [Means to solve the problem]   Under such circumstances, the present inventor has investigated the mechanism of corrosion.
After repeated research, substances were pressurized and heated
Subject to all kinds of external stresses,
Mechanical energy due to head stress changes to electrical energy
Which can lead to corrosion, and
The electrical energy that causes corrosion to the material
Low-energy AC electric field (electric field) and / or AC magnetic
Applying a magnetic field (static field) or static magnetic field (magnetic field), or alternating current
Electric field (electric field) and DC electric field (electric field) act simultaneously
Control to prevent corrosion of the goods.
I found it.   The electric circuit shown in Fig. 1-1 is used for this experiment.
Stainless steel seal made to block external electric fields
Sample (2) insulated and fixed in a box (S)
(Glass, rubber, etc. were fixed to ground without fixing
Object, i.e., ground one end of the sample without a resistor
With an oscilloscope at the end) and this circuit
Is 1-3 when the shield box (S) is not used.
It can be replaced as shown in FIG. So
Then, as shown in FIG.
The sample (2) is arranged at a distance d, and an air space is provided in the space d.
Exists. The piezoelectricity and pyroelectricity generated in sample (2)
An electric circuit is formed by propagating through the air layer. Fig. 1-2
In the figure, the space d is illustrated as approaching,
In practice there is considerable distance. This is
The air layer is ionized, resulting in corrosive substances
This means that the generated piezoelectricity and pyroelectricity will be transmitted to the domain,
Oxygen ions are adsorbed by such a biphasic electrical phenomenon.
In addition, the polarity is reversed and hydrogen is released, causing corrosion.
Means to understand. (Note) The electrical phenomena that occur in Figs.
It has been confirmed that this also occurs in FIGS. 1-3 and 1-4.   Further, the present inventor has stated that the piezoelectricity and pyroelectricity
Not only those with a structure but also those with an amorphous structure
I found it to be. The present invention is based on this finding.
Based on piezoelectric and / or pyroelectric
Piezoelectricity generated in corrosive substances that can generate air and / or
Or the corrosive substance characterized by controlling pyroelectricity
The anticorrosion method.   That is, the present invention provides a metal member for a machine or apparatus having the following configuration.
The anticorrosion method. (1) External force and / or heating due to vibration and / or rotation
The external force and / or
Or piezoelectricity generated in the metal member by being heated
And / or by controlling pyroelectricity,
Corrosion occurring on the metal member due to heating and / or heating
In a method for preventing corrosion of a metal member of a machine or device for preventing,
Piezoelectric and / or generated on metal parts of the machine or device
Is a method for controlling pyroelectricity,
AC electric field (electric field), AC magnetic field (magnetic field) or magnetostatic from outside
Apply field (magnetic field), or AC electric field (electric field) and DC electric field
(Electrical field) and simultaneously applying
Corrosion protection method for metal members of equipment. (2) Metal members are silver, iron, steel, stainless steel, copper, true
Brass, nickel silver, phosphor bronze, aluminum, duralumin,
(1) characterized in that it is zinc, lead or solder.
13. A method for preventing corrosion of a metal member of a machine or apparatus according to item 13. (3) The machine or device is a vehicle body.
Metal of the machine or device according to the above (1) or (2)
Corrosion prevention method for metal members. (4) The machine or device is an aircraft
The metal of the machine or the device according to the above (1) or (2).
Corrosion protection method for members. (5) The machine or device is a machine tool.
Metal of the machine or device according to the above (1) or (2)
Corrosion prevention method for metal members. (6) The machine or mounting is a motor or an engine
The machine according to the above (1) or (2),
Corrosion protection method for metal members of equipment. (7) The machine or device is a propeller
Metal of the machine or device according to the above (1) or (2)
Corrosion prevention method for metal members. (8) The machine or device is a rotating bearing.
Metal of the machine or device according to the above (1) or (2)
Corrosion prevention method for metal members. (9) The machine or device is a bearing sleeve
Machine or device according to the above (1) or (2)
Corrosion protection method for metal members. (10) The machine or device is the mounting part of the vibration machine
The machine according to the above mode (1) or (2),
Corrosion protection method for metal members of machines or devices. (11) The machine or device is the mounting part of the rotating machine
The machine according to the above mode (1) or (2),
Corrosion protection method for metal members of machines or devices.   When stress is applied to an article, the position change at the molecular level
The momentum converted to electric energy is piezoelectric or pyroelectric.
The present invention is based on the
An AC electric field (electric field) and an AC magnetic field (magnetic
Field) or a static magnetic field (magnetic field) is applied, or an AC electric field
(Electric field) and DC electric field (electric field)
Controls electrical energy and exerts anticorrosion effects
It is.   The order of generation of piezoelectricity or pyroelectricity depends on the coaxial cable from the generator.
And try to observe with an oscilloscope etc.
As a result, the attenuation in the middle is large, and
However, the generated order at the generated center point is actually large
Things. This is described in FIG. 1-1 and FIG.
It can be shown by Figure 2 and also Figures 1-3
And Figure 1-4. Therefore continuous to the center point
Occurs when an external force that can generate typical electricity is applied
Piezoelectricity or pyroelectricity are not negligible and may be corrosive.
It can occur not only on quality surfaces but also deeper. Inside corrosive substances
The generated piezoelectricity or pyroelectricity means that the surface is not corroded.
Generated electricity comes into contact with corrosive substances at their temporary surface.
Ionize the gas, resulting in an electrical reaction and
Reaction occurs and triggers corrosion. At the same time,
Electrical reaction between gas phenomena and constituent molecules of corrosive substances
Or electrochemical reactions occur, which in turn trigger corrosion.
Becomes   In the present invention, corrosive substances include piezoelectricity, pyroelectricity and the like.
Corrosion by the electrical energy of
For example, iron, stainless steel, solder, brass, aluminum
Metals such as aluminum, copper, ceramics such as tiles, glass, etc.
External stresses such as polymers, plastics, paints, etc.
When the constituent molecules are mechanically deformed, electrical energy is generated
What is born. In particular, this time, the present inventor
The material may generate piezoelectricity or pyroelectricity due to external force or heating.
And among such non-crystalline materials,
Apply the method of the present invention to metals that are likely to cause corrosion.
You.   Piezoelectric or pyroelectricity is generated in the above general materials
It was confirmed. Experiments and generated piezoelectric and pyroelectric
Qi causes corrosion, and
The following experiment was conducted to confirm that the corrosion method of the present invention was effective.
Shown in However, experiments on corrosion and anti-corrosion effects
I went only. All experiments were performed at room temperature. A. Confirmation experiment of generation of piezoelectricity   A zinc-plated iron plate (thickness 0.3 mm, length 70 x width 20 mm) was used as the sample.
Then, the measurement circuit shown in FIG.
This ensures that piezoelectricity is generated in the sample.
I accepted. The detailed condition values for configuring this measurement circuit are
It is as follows. The sample is held in a vise, and insulation is provided between the sample and the vise.
With glass for sheeting (sheet thickness 6.8mm, dimensions 40 × 65mm)
Was interposed. The holding state of the sample by the vice
Of the total length of 70 mm, 40 mm is pinched, and the remaining 30 mm is free tip
In this state, the projection protrudes from the clamp surface of the vise. Electromagnetic and electrical signals from outside that cause measurement errors
In order to eliminate species disturbance as much as possible, shield box
(SUS430, thickness 1.0mm, dimensions 450 × 210 × 255mm)
The experiment was performed. The shield box is grounded to the ground
Have been. The vice holding the sample is inside the shield box.
It is fixed to the wall with an L-shaped bracket, and it is conducted and becomes the same potential.
ing. The oscilloscope electrode is 20 mm from the side of the sample.
It was installed with an air gap.   In the connection state of the measurement circuit to the sample as described above,
From the protruding and free end of the sample, in the direction of extension of the longitudinal axis
From a distance of 50 mm, place a glass lot on the end face of the sample.
Apply a force of about 1.5kgf to 1.7kgf using a rod (300mm x 9mm)
When struck so as to give instantly, the
The oscilloscope voltage waveform at the moment of impact
After standing up, it attenuated monotonously in about 2 msec.   According to the above experiment, the zinc-plated iron plate was
(Piezoelectricity).
For other general materials, pressurized by similar experiments.
Generation of electricity was confirmed. B. Experiment to confirm generation of pyroelectricity   A silicon steel plate (sheet thickness 1.0 mm, length 250 x width 20 mm) was used as a sample.
Then, the measurement circuit shown in FIG. 1-2 was formed, and the sample was heated.
This ensures that piezoelectricity is generated in the sample.
I accepted. A detailed description of this measurement circuit follows.
You. The sample is held in a vise, and insulation is provided between the sample and the vise.
With glass for sheeting (sheet thickness 6.8mm, dimensions 40 × 65mm)
Was interposed. The holding state of the sample by the vice
50mm of the total length of 250mm is pinched, and the remaining 200mm is free to tip
With the vice protruding from the clamp surface of the vise.
You. Shield box specifications, vise shield box
Is the same as in Experiment A above. The value of success is r₁= 1 Ω to 1 MΩ, r_Two= 1 MΩ.   In the connection state of the measurement circuit to the sample as described above,
At the protruding free end of the sample, propane gas / acid
About 1500 ℃ using a portable mini torch
Instantaneously applied heat, as shown in Fig. 12,
For about 0.7 seconds from the moment, the oscilloscope voltage waveform is ±
After oscillating violently in the range of 40mV, it is monotonic for about 0.4sec
Decayed.   According to the above experiment, the silicon steel plate
(Pyroelectricity).
In addition, other common materials were focused on by similar experiments.
Generation of electricity was confirmed. C. Confirmation experiment that piezoelectricity causes corrosion   A silicon steel plate (sheet thickness 1.0 mm, length 120 x width 20 mm) was used as a sample.
And holding the sample in a vise as in Experiment A above.
2 sets, and only one sample has very slight curvature
Plastic deformation, giving continuous vibration to the free end,
Generated electricity. As a result,
Corrosion occurred on the sample. D. Confirmation experiment that the method of the present invention prevents corrosion   A sample holding the same sample as in Experiment C above
Prepared, and both samples have very slight plasticity
Deformation and continuous vibration at the free end
Only for this, an alternating current of 20 mV, 100 μA was applied to both ends. So
As a result, the sample to which no AC was applied was the same as the above-mentioned experiment C.
But the sample to which AC was applied did not corrode
Was.   The piezoelectrics generated in general materials by the experiments of C and D
Is the cause of corrosion.
It was confirmed that the anticorrosion method was effective.   As external stress that causes pyroelectricity, piezoelectricity, etc.
Means bridges, architectural structures, structures, transportation equipment, etc.
For example, the following are exemplified.   The load, vibration and running vibration of passing vehicles affect the ground.
Vibration transmitted from the ground   Wind pressure (ignoring the loading load and considering only its own fixed load
Affected by wind pressure)   Machine vibration of machine tools, processing industry, manufacturing industry, etc.   Cavitation in the atmosphere   Pressure change under atmospheric pressurized condition   Vibration or heat of motor, engine, etc.   In the present invention, the types of corrosion include, for example,
Examples are:   General corrosion   Local corrosion (including pitting)   Mechanical action corrosion   Therefore, in each of these cases, piezoelectricity,
Electricity is involved in corrosion, and the relationship between these electrical phenomena and corrosion phenomena.
Entrance is always unity.   In general, the electrical state of a corroded
The relationship between the corrosion voltage and current and the resistance of the corrosion circuit
I and anode potential E_A, Cathode potential E_CBetween the potential differences
Between the existing resistance R and the metal specific resistance r I (R + r) = E_A−E_C   Becomes   Corrosion proceeds under such electrical procedures
Yes, but the most corrosive environmental conditions
As it is, water and humidity-rich air (this is the amount of corrosion
The presence of oxygen is a prerequisite
Electrochemical reactions occur at the interface between these environments and the metal.
This forms a corrosion cell. Generally more than the form of corrosion
Oxygen consumption type and hydrogen generation type are available.
Considering the cross-section as shown in Fig. 3, a certain gold
Stress where corrosion has not yet formed in the cross-section of the metal
When piezoelectricity or pyroelectricity is generated due to thermal stress (more
However, these have uneven stress distribution due to uneven metal materials.
In the event of piezoelectricity or pyroelectricity
However, this electrical phenomenon occurs at the critical surface of the metal and the metal.
This results in a potential difference between the contacting gas.   As a result, it is not yet corroded,
Also, the generated piezoelectric and pyroelectric pole extreme values are
It is very high in location even if small. This is an oscilloscope
Observation was performed using a circuit as shown in FIG. this
Therefore, piezoelectricity and pyroelectricity contact the critical surface of the source metal.
Involved in the ionization of the gas of the contacting
A chemical reaction occurs, ie, triggers corrosion.   The synergy between this and the environment can lead to further corrosion.
Results.   Considering the phenomenon of Fig. 1-2 by replacing it with a concrete example,
For example, as shown in Fig. 2, a long metal body
When piezoelectricity and pyroelectricity are generated at an arbitrary point P on the metal body of
In the vicinity of the area, relative to the generated piezoelectricity and pyroelectricity
Contacts with critical surfaces, such as gas
Corrosion begins when the body is ionized. That is, contact
I suppose that the ionization of the body starts at infinity and corrosion begins.
No.   This time, the cutting of the metal that has already
Considering in terms of surface, the figure shows the same
FIG. 3 shows the metal surface and inner cross section described above with reference to FIG.
The potential difference between points A and B for corrosion of the relationship
And Ev = E_A−E_BOr Ev = E_B−E_A And reversible (except for how they engage
And of course, another piezoelectricity, pyroelectric
Happens).   Also, the cross section of the material has a cross sectional relationship as shown in FIG.
There is a cavity in the vicinity of stress potential point B including non-uniform material
In such cases, there are many corrosion points generated on the surface.
In many cases, the corrosion progresses toward this cavity and eventually
When this cavity is reached, a stress limit occurs in the cross section of the material,
A breakage accident will occur.   Another embodiment will be described. Corrosion due to stress and thermal stress
In the case of eating, the following cases are exemplified. (A) Propeller, etc. (B) Rotary bearing part, sliding part, bearing sleeve part (C) Vibration machine, rotating machine mounting part   In these cases, there is residual stress at the time of manufacture, and the
Contraction and tension are working, but in a state that stimulates this further
As a result of operating stress, compressive and tensile stresses are reduced in cross-section.
In a state of amplification. This results in piezoelectricity
You.   In cases (b) and (c), simple rotational vibrations or very
Corrosion is caused by radial rotation.
Has spread to the surrounding area. Again, the shadow of piezoelectricity and pyroelectricity
It seems to be affected.   The above places have been frequent and frequent occurrences of corrosion
It has been reported as. And in these places
Piezoelectricity and pyroelectricity exist simultaneously and are involved in corrosion
doing.   Piezoelectric and pyroelectric for rubber, plastic, painted steel plate, etc.
(If there is piezoelectricity, pyroelectricity means electrical properties
Rust-proof material, aesthetically-finished material
The paint used itself also has piezoelectricity inside the metal,
Piezoelectricity, pyroelectricity, occurs separately from pyroelectricity. Here the painted skin
If there are pinholes or cracks in the film,
It will further promote corrosion.   Conversely, even if there is no damage on the painted surface
We believe that corrosion will occur.   These delicate piezoelectric and pyroelectric developments will eventually
In preparation for full-scale corrosion at a later date, so-called triggers,
Will work as an agent. Original rust-preventive paint has increased corrosion
He said he would work as an auxiliary, but this was never
There is no side.   That is, the piezoelectricity and pyroelectricity that occur between them are related to each other.
The electrical standpoint of paint is related to the work function of metal.
In this case, there is an anticorrosion effect if working in the direction of control.
Therefore, the piezoelectricity and pyroelectricity, which are opposite to metal, also exist in the paint itself.
Metal and paint, rather than happening separately and doing completely different things
The electrical function is always in the anti-corrosion direction
is necessary. In the same way, the effect of magnetizing the paint is also effective.
Will be.   Oxidation is accelerated at places where oxidation has already progressed.
Is not recognized, that is, there is a history of oxidation
It is a place where the current situation is stable after making such a coating
However, there is a phenomenon in which oxidation is suddenly restarted one time. this
The recurrence phenomenon is thought to involve piezoelectricity and pyroelectricity.
You.   Locations that have a history of oxidation and are now electrically stable
Oxide film formed by changing mechanical and thermodynamic environmental conditions
The relationship between the piezoelectric film and pyroelectricity
As a result of electrical operation, it reaches the outer critical surface of the same coating
It will diffuse and restart oxidation.   According to the piezoelectric and / or pyroelectric control method of the present invention,
Does not require any particular restrictions, for example, the generated piezoelectricity, pyroelectricity
Cancel (eg, the piezoelectric and / or pyroelectric
To apply an AC electric field from outside to control
Method, method of applying AC magnetic field, application of magnetic paint
Or the attachment of a magnetic material).
You.   At least one circuit for applying an AC electric field
And it may be increased or decreased as appropriate depending on the number of electricity generation sources, generation location, etc.
I just need. If the number of sources is unknown, assume several locations in advance
And install it. External when using multiple application devices
The power supply must be equal pressure, and if there is a potential difference,
A potential difference appears at both ends of the power supply. External AC power
Anti-corrosion even if the power source and DC external power supply are applied simultaneously
It will be effective. In this case,
The source need not be isobaric in that respect and
The distribution number of the source depends on the AC
Since the target is different, the distribution number of each applied power source may be different.   The AC power supply used has a frequency of 10 Hz to 6000 Hz and a voltage of 0.01.
V-600V, preferably voltage 0.01V-1 at frequency 10Hz-600Hz
Flow V. One aspect of applying AC from outside is
This is carried out using an apparatus as shown in FIG.   AC power output applied in the electric circuit shown in FIG.
Is continuously changed from a small state to a large state, and
Oscilloscope while hitting the sample steel body and applying heat during
Observation shows that the pressure on the applied AC waveform
Electric and pyroelectric waveforms can be observed, but the applied power
Then, the piezoelectricity and pyroelectricity disappear and the applied AC waveform
Only observation results.   For the applied AC power output, the stress generated in the rigid metal
Of course, it is necessary to change the relative
The relationship between the voltage and current of the AC power supply
Therefore, it is necessary to respond to increase or decrease
is there.   In addition, piezoelectric, pyroelectric,
Corrosion occurs due to air, and does not serve as rust preventive paint
Become. For such paints, the application of magnetic paint or magnetic paint
It is preferable to attach a sex substance. Mix magnetic powder with paint
And the amount of contamination increases or decreases according to the stress of the metal body.
do it. [Action / Effect]   The present invention is not limited to the surface of steel
Corrosion can be prevented by controlling pressure and piezoelectricity. This
Is a large plan with many opportunities to generate piezoelectricity and pyroelectricity
Building, civil engineering work, bridges, etc., vehicle bodies, aircraft, passing
Corrosion due to mechanical or thermodynamic effects such as load and steel frame
It is effective for things. [Example]   As mentioned above, piezoelectric or pyroelectric
Shown in Fig. 1-2, Fig. 1-3 or Fig. 1-4
Can be equally replaced on the electric circuit.
And observable piezoelectricity and pyroelectricity show biphasic, space
Is propagated. Because of this, acids present in the environment
Hydroxides, carbonates, nitrites, sulfites
When generated piezoelectricity and pyroelectricity are in the positive region
Is O from the environment_Two ^-Adsorbs (-) ions and negative
When in the area, H_ThreeO⁺(+) Ion such as, hydronium
Will be adsorbed. The mechanism of natural corrosion has been
Depending on the environmental conditions, the oxygen consumption type or hydrogen release
Corrosion due to appearance, etc. is widely recognized. So this study
As soon as piezoelectricity or pyroelectricity is generated as in
That is to be money.   Therefore, by controlling this piezoelectricity or pyroelectricity,
Corrosion can be prevented.   Hereinafter, an example of the anticorrosion method of the present invention will be described. Example 1   Controlled times for a single source of piezoelectric or pyroelectricity
The road is shown in FIG. E₁Is the source, L₁Is a circuit, M is a metal plate
Is shown. Electricity source (E₁) Generates electricity in the circuit (L₁)
Controlled by the current applied by the AC power supply
Is controlled. Example 2   FIG. 7 shows a control circuit in the case of two sources.
E₁, E_TwoIs the source, L₁, L_TwoIndicates a circuit, and M indicates a metal plate. Electric
Air source (E₁) And (E_TwoThe electricity generated by the
(L₁) And (L_Two) Depending on the AC power supply
It is controlled by the applied current. In this case,
Pressures are equal. If the number of sources is n, build n circuits
Good. Example 3   FIG. 8 shows a control circuit in the case of three sources.   E₁, E_Two, E_ThreeIs the source, L₁Is a circuit, R is a resistor, M is a metal
Show the board. Contact (A)₁), (A_Two), (A_Three)
And the corresponding contact (A ′₁), (A '₂),
(A '₃Take). A circuit as shown in FIG.₁)
The current applied by the AC power supply
(E₁), (E_Two), (E_Three) To control the electricity generated. Departure
If the source is n, place A on the metal plate (M).₁~ A_nThat of the contacts
A 'corresponding to₁~ A '_nA 'corresponding to that of the contact
₁~ A '_nContact. Example 4   If the source is locally scattered, it is shown in Fig. 9.
Such a circuit can be assembled and controlled. E₁, E_TwoDeparts
Source, L₁, L_TwoDenotes a circuit, R denotes a resistor, and M denotes a metal plate. Example 5   When applying a magnetic field to the source, see Fig. 10-1
And the generated electricity is controlled as shown in Fig. 10-2.
You. Depending on the source, the coil (5) is wound directly and the alternating current
To create a magnetic field in the source body (Fig. 10-1)
reference). Alternatively, a permanent magnet (6) is attached to the source.
(See Fig. 10-2). Reference Example 1   The circuit shown in Fig. 5 was prepared, and the sample steel strip was pressed or pressed.
Oscilloscope shows how piezoelectric or pyroelectricity is generated when heated
I checked it in the loop. The results are shown in the table below. M in the figure is a sample
Steel piece, R is resistance, OSC is oscilloscope, in table
A mark indicates that piezoelectricity or pyroelectricity was generated. In addition,
Pressure should be applied with a medical diagnostic rubber hammer (continuous
Pressing is performed by hitting continuously with a hammer).
Was carried out by heating to 100-1500 ° C. [Brief Description of the Drawings] FIG. 1-1, FIG. 1-2, FIG. 1-3 and FIG.
Experimental equipment to confirm the electrical phenomena that cause corrosion
Schematic diagrams, FIGS. 2 and 3 show piezoelectric and pyroelectric
FIG. 4 is a schematic view showing a state where the occurrence has occurred, and FIG.
Electricity to check the generation of piezoelectricity and pyroelectricity
Circuit diagram, Fig. 5 shows the generation of piezoelectricity and pyroelectricity in the sample steel
Electric circuit diagram for examining the situation, Fig. 6
Control circuit diagram when there is one source of a certain electrical phenomenon, FIG.
The figure shows the case where there are two sources of electrical phenomena, which are factors of corrosion.
Control circuit diagram, Fig. 8 shows the occurrence of electrical phenomena which is the cause of corrosion
Control circuit diagram for three sources, FIG. 9 shows factors of corrosion
When the source of electrical phenomena varies locally
The control circuit diagram and Fig. 10-1 show the electrical phenomena that cause corrosion.
Circuit diagram controlled by the magnetic field of the alternating current passed through the il,
Fig. 10-2 shows that the electrical phenomenon,
FIG. 2 shows a circuit diagram for controlling by a magnetic field. Fig. 11 shows the results of an oscilloscope
FIG. 3 is a diagram showing a waveform of piezoelectricity shown in FIG.
The vertical scale is 2.5mV and the horizontal scale is
Is 5 msec. Fig. 12 shows the results of an oscilloscope
FIG. 3 is a diagram showing a pyroelectric waveform shown in FIG.
The vertical scale of the graph is 20mV, the horizontal scale is 1
Is 0.2 sec. M: sample metal E₁, E_Two, E_Three:Generation source R: resistance L₁, L_Two:circuit

Claims (1)

(57) [Claims] By controlling the piezoelectricity and / or pyroelectricity of a metal member of a machine or a device that is subjected to external force and / or heating due to vibration and / or rotation by receiving the external force and / or heating. In a method for preventing corrosion of a metal member of a machine or a device for preventing corrosion generated in the metal member due to the external force and / or heating, a piezoelectricity and / or a pyroelectricity generated in a metal member of the machine or a device are controlled. As a control method, an AC electric field (electric field), an AC magnetic field (magnetic field) or a static magnetic field (magnetic field) is applied to the metal member from the outside, or an AC electric field (electric field) and a DC electric field (electric field) are simultaneously applied. A method for preventing corrosion of a metal member of a machine or apparatus. 2. Metal members are silver, iron, steel, stainless steel, copper, brass,
The method for preventing corrosion of a metal member of a machine or apparatus according to claim 1, wherein the metal member is nickel silver, phosphor bronze, aluminum, duralumin, zinc, lead or solder. 3. 3. The method for preventing corrosion of a metal member of a machine or a device according to claim 1, wherein the machine or the device is a vehicle body. 4. The method for preventing corrosion of a metal member of a machine or a device according to claim 1, wherein the machine or the device is an aircraft. 5. The method for preventing corrosion of a metal member of a machine or a device according to claim 1 or 2, wherein the machine or the device is a machine tool. 6. The method for preventing corrosion of a metal member of a machine or a device according to claim 1 or 2, wherein the machine or the mounting is a motor or an engine. 7. 3. The method for preventing corrosion of a metal member of a machine or a device according to claim 1, wherein the machine or the device is a propeller. 8. The method for preventing corrosion of a metal member of a machine or a device according to claim 1 or 2, wherein the machine or the device is a rotary bearing. 9. The method for preventing corrosion of a metal member of a machine or a device according to claim 1 or 2, wherein the machine or the device is a bearing sleeve. 10. The method for preventing corrosion of a metal member of a machine or a device according to claim 1 or 2, wherein the machine or the device is a mounting portion of a vibration machine. 11. The method for preventing corrosion of a metal member of a machine or a device according to claim 1 or 2, wherein the machine or the device is a mounting portion of a rotating machine.