JP2014142265A - Corrosion prevention performance deterioration detection sensor and water circulation system with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrosion prevention performance deterioration detection sensor for preventing a defect from occurring in a corrosion preventive coating in an entire system, and preventing deterioration in a corrosion prevention performance of a corrosion inhibitor from being made unlikely to be detected because of influences of water quality and a water temperature, etc., and a water circulation system with the same.SOLUTION: The corrosion prevention performance deterioration detection sensor comprises: a sensor electrode which is provided within a pipe so as to keep insulation from the pipe and formed from the same material as the pipe; a corrosion preventive coating destruction device for destroying a corrosion preventive coating formed on a surface of the sensor electrode by a corrosion inhibitor; and a corrosion prevention performance deterioration detection device for detecting deterioration in a corrosion prevention performance of the corrosion inhibitor from an impedance change before and after the corrosion preventive coating on the surface of the sensor electrode is destroyed by the corrosion preventive coating destruction device.

Description

  The present invention relates to an anticorrosion performance deterioration detection sensor and a water circulation system including the same.

In water circulation systems such as hot water heating and heating systems and air conditioning systems, a corrosion inhibitor added to the liquid circulating in the water circulation circuit is used to suppress corrosion of metal materials such as conductive piping that forms part of the water circulation circuit of the water circulation system. In addition, an anticorrosive film formed on the inner surface of a conductive pipe or the like has been proposed.
However, if the anticorrosion coating deteriorates due to long-term use, etc., the anticorrosion performance of the inner surface of the pipe will deteriorate, and the corrosion of the metal material will proceed. As the corrosion of the metal material proceeds, pitting corrosion that reaches the through hole occurs in the metal material, and the liquid in the water circulation circuit leaks, so that the heat exchange performance is significantly lowered.

Therefore, in order to prevent deterioration of heat exchange performance due to leakage of liquid in the water circulation circuit in such a water circulation system, an anticorrosion coating formed on a metal material such as a pipe constituting a part of the water circulation circuit of the water circulation system It is necessary to detect the state before the deterioration occurs and take appropriate measures such as replenishing the corrosion inhibitor.
Therefore, a method for detecting a defect portion of the anticorrosion film caused by the deterioration of the anticorrosion film from the frequency characteristic of the impedance between the metal on which the anticorrosion film is applied and the electrode installed in advance has been proposed (for example, Patent Documents). 1). The technique described in Patent Document 1 detects and evaluates the magnitude of peeling of the anticorrosive film and the size of the anticorrosive film defect from the capacitance component of the impedance curve and the electric double layer capacity of the metal, respectively.

  In addition, various corrosion environment factors such as corrosion rate and corrosion inhibitor concentration of metallic materials in conductive corrosion media are continuously measured, and based on these correlations, environmental factors that cause fluctuations in corrosion rate And a corrosion / corrosion prevention monitoring control system is proposed in which the environmental factor is changed to the anticorrosion side (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 63-222253 (for example, refer to claim 1, FIG. 1 on page 4 of the specification) Japanese Examined Patent Publication No. 3-31792 (for example, refer to claim 1, FIG. 1 on page 5 of the specification)

  The technique described in Patent Document 1 detects a defect portion of the anticorrosion film from the frequency characteristic of the impedance between the metal on which the anticorrosion film is applied and the electrode installed in advance. This method can detect defects in the anti-corrosion coating that occurred in the vicinity where the electrode is installed, but in a water circulation system with a large area of metal on which the anti-corrosion coating has been applied, detection of the anti-corrosion coating defect in a portion away from the electrode Was difficult. That is, the technique described in Patent Document 1 has a problem that it is difficult to monitor the anticorrosion film of the entire system.

  Moreover, the technique described in Patent Document 1 detects a state after a defect occurs in the anticorrosion film, and cannot prevent the occurrence of a defect in the anticorrosion film. In particular, in a system with a high corrosion rate, the amount of corrosion damage of the anticorrosion film also becomes large, and therefore it is not possible to cope with re-forming of the anticorrosion film with a corrosion inhibitor flowing in the water circulation circuit. That is, the technique described in Patent Document 1 has a problem in that the occurrence of defects in the anticorrosion film cannot be suppressed in advance.

  The technique described in Patent Document 2 continuously measures various corrosion environment factors such as the corrosion rate and corrosion inhibitor concentration of a metal material in a conductive corrosion medium, and based on these correlations, The causal environmental factor is identified, and the environmental factor is changed to the anticorrosion side, and corrosion and anticorrosion monitoring control is performed. This method requires continuous monitoring of various corrosion environment factors such as corrosion inhibitor concentration. However, in corrosion media with increased resistance due to the addition of corrosion inhibitors or antifreeze, the concentration of corrosion inhibitor is reduced. Therefore, it is difficult to measure the variation of the corrosion inhibitor concentration. That is, the technique described in Patent Document 2 has a problem that depending on the water quality of the water circulation circuit, it is difficult to measure the variation in the concentration of the corrosion inhibitor, and the anticorrosion film cannot be monitored more reliably.

  Further, the resistance value of the corrosion medium to which a salt such as a corrosion inhibitor is added has temperature dependence. Specifically, even in a corrosive medium having the same concentration, the resistance of the corrosive medium decreases as the temperature increases, and the resistance increases as the temperature decreases. Therefore, when monitoring corrosion / corrosion prevention monitoring while detecting the resistance change of the corrosive medium, it is necessary to install a resistance compensation function corresponding to the temperature of the corrosive medium, without considering the cost and installation space involved in the installation. There was a problem that it should not be.

  The present invention has been made in order to solve the above-described problems, and suppresses the occurrence of defects in the anticorrosion film of the entire system, and the anticorrosion performance of the corrosion inhibitor due to the influence of water quality and water temperature. It aims at providing the anti-corrosion performance degradation detection sensor which realizes suppressing that it becomes difficult to detect degradation of water, and a water circulation system provided with the same.

  The anticorrosion performance deterioration detection sensor according to the present invention is an anticorrosion performance deterioration detection sensor that detects deterioration of the anticorrosion performance of a corrosion inhibitor that is added to a liquid flowing through a conductive pipe and forms an anticorrosion coating on the inner surface of the pipe. Is provided in the pipe so as to maintain insulation, the sensor electrode made of the same material as the pipe, the anti-corrosion film destruction apparatus for destroying the anti-corrosion film formed on the surface of the sensor electrode by the corrosion inhibitor, and the anti-corrosion film destruction apparatus And an anticorrosion performance deterioration detecting device for detecting deterioration of the anticorrosion performance of the corrosion inhibitor by impedance change before and after destroying the anticorrosion coating on the surface of the sensor electrode.

  According to the anticorrosion performance deterioration detection sensor according to the present invention, since it has the above-described configuration, it is possible to suppress the occurrence of defects in the anticorrosion film of the entire system, and to prevent the corrosion inhibitor from being affected by water quality and water temperature. It can suppress that it becomes difficult to detect deterioration of anticorrosion performance.

It is a figure which shows an example of the anticorrosion performance degradation detection sensor which concerns on Embodiment 1 of this invention. It is explanatory drawing of an example of the anti-corrosion film destruction apparatus in the anti-corrosion performance degradation detection sensor which concerns on Embodiment 1 of this invention. It is a figure showing an example of the shape of the rotary body in the anticorrosion performance degradation detection sensor which concerns on Embodiment 1 of this invention. It is a figure showing an example of the rotation control mechanism of the rotary body of the anticorrosion film destruction apparatus in the anticorrosion performance degradation detection sensor which concerns on Embodiment 1 of this invention. It is a figure which shows the time-dependent change of the impedance before and after destruction of the anticorrosion film measured in the liquid in the pipe line where the corrosion inhibitor is not deteriorated by the anticorrosion performance deterioration detection sensor according to Embodiment 1 of the present invention. It is a figure which shows the time-dependent change of the impedance before and behind destruction of the anticorrosion film measured in the liquid in the pipe line in which the corrosion inhibitor has deteriorated by the anticorrosion performance deterioration detection sensor according to Embodiment 1 of the present invention. It is a figure which shows an example of schematic structure of the water circulation system provided with the anti-corrosion performance degradation detection sensor which concerns on Embodiment 2 of this invention. It is a flowchart of anticorrosion performance degradation determination by the water circulation system provided with the anticorrosion performance degradation detection sensor which concerns on Embodiment 2 of this invention. It is explanatory drawing of an example of the anti-corrosion film destruction apparatus in the anti-corrosion performance degradation detection sensor which concerns on Embodiment 3 of this invention. It is explanatory drawing of an example of the anti-corrosion film destruction apparatus in the anti-corrosion performance degradation detection sensor which concerns on Embodiment 4 of this invention. It is explanatory drawing of an example of the anti-corrosion film destruction apparatus in the anti-corrosion performance degradation detection sensor which concerns on Embodiment 5 of this invention. It is a figure showing an example of the control mechanism of the flow of the liquid in a pipe line by the valve in the anticorrosion performance degradation detection sensor concerning Embodiment 6 of the present invention. It is explanatory drawing of an example of the anti-corrosion film destruction apparatus in the anti-corrosion performance degradation detection sensor which concerns on Embodiment 6 of this invention. It is a figure showing an example of the anticorrosion performance degradation detection sensor which concerns on Embodiment 7 of this invention. It is a figure showing an example of the anticorrosion performance degradation detection sensor which concerns on Embodiment 8 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a diagram illustrating an example of a schematic configuration of the anticorrosion performance deterioration detection sensor 100 according to the first embodiment. The anticorrosion performance deterioration detection sensor 100 is provided in a conductive pipe of a water circulation system such as a hot water heating / heating system or an air conditioning system provided with a heat exchanger, and the anticorrosion coating applied to the inner surface of the pipe is deteriorated. It detects the previous state.

[Configuration of Anticorrosion Performance Degradation Detection Sensor 100]
As shown in FIG. 1, the anticorrosion performance deterioration detection sensor 100 is provided in the conductive pipe 1 through which the liquid in the pipe line to which the corrosion inhibitor is added flows. And the anti-corrosion performance degradation detection sensor 100 is installed in the pipe line through the insulating member 4 so as to maintain the insulation from the pipe 1 but in contact with the liquid 2 in the pipe line, and the anti-corrosion coating 3 by the corrosion inhibitor. Sensor electrode 5 "," corrosion protection film destroying device 6 for destroying the corrosion protection film 3 formed on the surface of the sensor electrode 5 by the corrosion inhibitor added to the liquid 2 in the pipeline ", and" one terminal AC power supply 8 having a terminal taken from pipe 1 connected to the other terminal and a terminal taken from sensor electrode 5 connected to the other terminal via ammeter 7, “impedance measuring instrument 9”, and “corrosion due to impedance change” The anti-corrosion performance deterioration detecting device 10 ”for determining the presence or absence of deterioration of the anti-corrosion performance of the inhibitor.
In the first embodiment, the anticorrosion performance deterioration detection sensor 100 is described as having the AC power supply 8, but is not limited thereto, and for example, an external power supply or the like instead of the AC power supply 8. Alternatively, a voltage obtained by taking a voltage and converting it to a predetermined frequency and voltage may be used.

  The pipe 1 is a conductive pipe made of copper, stainless steel, or the like, and generally forms a pipe line for circulating a coolant or the like in a water circulation system such as a hot water supply / heating system. In addition, the liquid 2 in the pipe flowing through the pipe 1 is a coolant flowing in the pipe formed by the pipe 1, and a corrosion inhibitor is added to form the anticorrosive coating 3 on the inner surface of the pipe 1. As the in-pipe liquid 2, a liquid added with a salt other than a corrosion inhibitor such as an antifreeze can be used depending on the application.

The anticorrosion coating 3 blocks the conduction of current between the pipe 1 and the liquid 2 in the pipe line, and suppresses corrosion on the inner surface of the pipe 1. The anticorrosion coating 3 is an insulating coating formed by a corrosion inhibitor added to the liquid 2 in the pipe line. The anticorrosion coating 3 is also formed on the surface of the sensor electrode 5 in addition to the pipe 1 and the like.
The insulating member 4 is installed between the two conductors in order to connect the two conductors in an electrically insulated state. Specifically, a synthetic resin such as polyester or epoxy resin, or an insulator such as polyethylene, polyvinyl chloride, or natural rubber can be used.
The sensor electrode 5 is in contact with the liquid 2 in the pipe line, but is installed in the pipe line via the insulating member 4 so as to keep insulation from the pipe 1. The sensor electrode 5 is an electrode made of the same material as the pipe 1. That is, if the pipe 1 is made of copper, the sensor electrode 5 is also made of copper. An anticorrosive coating 3 is formed on the surface of the sensor electrode 5 by a corrosion inhibitor added to the liquid 2 in the pipe line.

The anticorrosion coating destruction device 6 has a rotating body 6a (see FIG. 2), and is an apparatus for destroying the anticorrosion coating 3 formed on the surface of the sensor electrode 5 by the rotation of the rotating body 6a. In the structure of the rotating body 6a, a part of the surface parallel to the rotation axis is convex. Thereby, the rotating body 6a can destroy the anticorrosion film 3 when the convex portion contacts the anticorrosion film 3 on the surface of the sensor electrode 5 during rotation. In the first embodiment, the flow of the liquid 2 in the pipeline is used as the rotational power of the rotating body 6a. Moreover, since the anticorrosion film destruction apparatus 6 contacts with the liquid 2 in a pipe line, it is comprised from the metal which has high electrochemical stability and is hard to corrode. Specifically, it may be composed of an electrochemically noble metal such as gold, platinum, titanium, copper, and stainless steel.
The anticorrosion film destruction apparatus 6 will be described in detail with reference to FIG.

  The ammeter 7 is for detecting a current flowing through the circuit when an AC voltage is applied to a circuit composed of the pipe 1, the liquid 2 in the pipe line, the anticorrosion coating 3, and the sensor electrode 5. Specifically, an ammeter that obtains a current value by a voltage drop in a resistor connected between two points after opening a circuit at a measurement location, a clamp meter that can measure a current value without opening the circuit, and the like can be used.

The AC power supply 8 applies an AC voltage to a circuit composed of the pipe 1, the liquid in the pipe 2, the anticorrosion coating 3, and the sensor electrode 5.
About the alternating voltage applied by the alternating current power supply 8, since the sensitivity of an electric current response improves so that a voltage value is large, on the other hand, since electrode reaction advances easily, it needs to be optimized. That is, the larger the voltage value, the better the sensitivity, but the elution of the metal constituting the pipe 1 and the like is likely to proceed due to the electrode reaction, so that it should be optimized. In order to achieve both current response sensitivity and suppression of electrode reaction progress, the applied voltage is preferably 10 mV to 50 mV. Moreover, in order to reduce the influence on the impedance by the temperature change of the liquid 2 in the pipe line, the frequency is preferably set to a medium frequency of 1 Hz to 100 Hz.

  The impedance measuring device 9 issues a command to apply a predetermined AC voltage to the AC power supply 8, obtains a detected current value for the command from the ammeter 7, and calculates the impedance by dividing the AC voltage value by the detected current value. .

The anti-corrosion performance degradation detection device 10 issues a command to destroy the anti-corrosion coating 3 on the surface of the sensor electrode 5 to the anti-corrosion coating destruction device 6 and issues an instruction to the impedance measuring device 9 to measure the impedance at regular intervals before and after the destruction. The presence or absence of deterioration of the anticorrosion performance of the corrosion inhibitor is determined using the ability to re-form the anti-corrosion film 3 as an index from the impedance change accompanying the film destruction and the film re-formation after destruction.
If the corrosion inhibitor deterioration determination interval by the anticorrosion performance deterioration detection device 10 is too long, water leakage or the like may occur due to corrosion in the piping accompanying the deterioration of the corrosion inhibitor in the meantime. On the other hand, when the interval for determining the deterioration of the corrosion inhibitor is extremely shortened, the destruction / reformation of the anticorrosion coating 3 on the surface of the sensor electrode 5 is repeated many times in a short time, and the deterioration of the corrosion inhibitor, etc. May be induced. Therefore, it is preferable to set the interval of deterioration determination of the corrosion inhibitor by the anticorrosion performance deterioration detection device 10 to about 1 month to 1 year.

  The interval of impedance measurement by the impedance measuring instrument 9 needs to be sufficiently short in order to accurately measure the change with time of impedance. However, impedance measurement requires a time at least equal to the reciprocal of the frequency of the AC voltage. Therefore, the interval of impedance measurement by the impedance measuring instrument 9 can be set to a time equal to the reciprocal of the frequency of the AC voltage. Specifically, when the frequency of the AC voltage is 10 Hz, the impedance measurement interval can be 0.1 seconds.

  In addition, in order to clearly detect the destruction of the anticorrosion film 3 due to the impedance change, it is necessary to maintain the state in which the anticorrosion film 3 is destroyed for a time equal to or longer than the impedance measurement interval for each fixed time by the impedance measuring device 9. . However, if the state in which the anticorrosion film 3 is broken continues for a long time, the corrosion inhibitor may be deteriorated. Therefore, the anticorrosion film is produced only for the time equal to the impedance measurement interval by the impedance measuring device 9 every constant time. It is preferable to maintain the state in which the anticorrosion coating 3 is broken by the breaking device 6.

[Description of Operation of Anticorrosion Performance Degradation Detection Sensor 100]
The anti-corrosion performance degradation detection sensor 100 monitors the impedance change before and after the anti-corrosion coating 3 on the surface of the sensor electrode 5 is destroyed by the anti-corrosion coating destruction device 6 by the impedance measuring device 9, and corrodes using the impedance change in the film reformation as an index. The presence or absence of deterioration of the inhibitor is determined. That is, the anti-corrosion performance deterioration detection sensor 100 detects deterioration of the anti-corrosion performance of the corrosion inhibitor using the ability to re-form the anti-corrosion coating 3 destroyed by the anti-corrosion coating destruction device 6 as an index.
The impedance measuring device 9 measures the impedance Z of a circuit composed of the pipe 1, the pipe liquid 2, the anticorrosion coating 3, and the sensor electrode 5. Z is a synthetic impedance Zs composed of “the resistance component at the interface between the pipe 1 and the sensor electrode 5 on which the anticorrosive coating 3 is formed and the liquid 2 in the pipe line” and “the solution resistance due to the liquid 2 in the pipe line”. , The impedance Zi by the anticorrosion coating 3 can be separated. That is, Z can be expressed by the following formula using Zs and Zi.

  Z = Zs + Zi (1)

Here, Zs is an impedance component irrelevant to the state of the anticorrosion coating 3, and its magnitude is smaller than Zi because the anticorrosion coating 3 is insulative. The impedance due to the anticorrosion coating 3 measured by the impedance measuring device 9 at time t is defined as Zi (t).
When the in-pipe liquid 2 to which the corrosion inhibitor is added contacts the inner surface of the pipe 1 on which the anticorrosion coating 3 is not formed, the anticorrosion coating 3 is formed on the inner surface of the pipe 1. With the formation of the anticorrosion coating 3, the impedance Zi increases. Then, when the formation of the anticorrosion coating 3 is completed and becomes a steady state, the thickness of the anticorrosion coating 3 does not change, and the impedance Zi becomes a constant value.

  It is assumed that the corrosion inhibitor is not deteriorated at time t1 and the anticorrosion coating 3 exists stably and is not broken. When the anticorrosion film 3 is destroyed by the anticorrosion film destruction apparatus 6 at time t2 (t2> t1), Zi decreases, and the following expression is established.

Zi (t2) <Zi (t1) (2)
Since the in-pipe liquid 2 to which the corrosion inhibitor is added comes into contact with the portion where the coating is destroyed, the anticorrosion coating 3 is re-formed. Zi increases as the film is re-formed, and the following relationship is established at time t3 (t3>t2> t1) when the re-formation of the film is completed.

  Zi (t3) = Zi (t1) (3)

That is, when the corrosion inhibitor is not deteriorated, the impedance decreased due to the destruction of the coating increases with the passage of time, and after a certain time (t3-t2) from the coating breaking time t2, the anticorrosion coating 3 is broken. Return to the value at time t1.
On the other hand, when the corrosion inhibitor is deteriorated, the film re-formation is insufficient, so that the formula (3) does not hold, and the relationship between Zi (t1) and Zi (t3) is as follows.

  Zi (t3) <Zi (t1) (4)

Since Zs does not change due to film destruction / reformation and is smaller than Zi, the change in Zi accompanying the above-mentioned film destruction / reformation can be detected by Z measured by the impedance measuring instrument 9.
In order to quantitatively determine the presence or absence of deterioration of the corrosion inhibitor from the change in Z accompanying the above-mentioned film destruction / reformation, the film re-forming speed V is defined as follows.

  V (t1) = (Z (t3) −Z (t2)) / (t3−t2) (5)

  Here, Z (t) is the impedance detected by the impedance measuring instrument 9 at time t. The presence or absence of deterioration of the corrosion inhibitor can be determined by the film re-forming speed V as follows.

In the case of V = 0, it represents that the impedance has not changed after the coating is broken, and it can be determined that the coating is not re-formed and the corrosion inhibitor is deteriorated.
In the case of V <0, it indicates that the impedance has decreased after the film breakage, and it can be determined that the electrode reaction is activated in the film breakage part, the film re-formation has not occurred, and the corrosion inhibitor has deteriorated. .
In the case of V> 0, it can be determined that the film reformation has progressed and the corrosion inhibitor has not deteriorated.

  As described above, the presence or absence of deterioration of the corrosion inhibitor can be determined using the ability to re-form the anticorrosion coating 3 on the surface of the sensor electrode 5 as an index. And since the corrosion inhibitor 3 will deteriorate when the corrosion inhibitor is completely deteriorated, the state before the corrosion protective film 3 is deteriorated can be detected by detecting the deterioration of the corrosion inhibitor 3.

In addition, Zs may change due to changes in water quality and temperature of the liquid 2 in the pipeline, but Zs is smaller than Zi. In addition, the electric double layer capacitance is dominant in the impedance at a medium frequency of about 1 Hz to 100 Hz, but this electric double layer capacitance is small in temperature dependency. For this reason, the influence on the impedance by the temperature change of Zs can be reduced by using a medium frequency.
Therefore, even when water quality changes and temperature changes occur due to impurities mixed in the liquid 2 in the pipe line, and Zs changes, changes in Zi due to film destruction / reformation can be clearly detected. That is, the anticorrosion performance deterioration detection sensor 100 detects the deterioration of the corrosion inhibitor by separating the influence of water quality change and temperature change due to the contamination of the liquid 2 in the pipeline, before the anticorrosion coating 3 is deteriorated. Can be detected.

  As described above, by using the anticorrosion performance deterioration detection sensor 100 according to the first embodiment, the influence of the water quality change and the temperature change due to the mixing of impurities into the liquid 2 in the pipe is separated, and the liquid in the pipe Using the presence or absence of deterioration of the corrosion inhibitor added to 2 as an index, the state before deterioration of the anticorrosion coating 3 can be detected for the entire pipe.

[Anti-corrosion coating]
In order to prevent corrosion on the inner surface of the pipe 1, the anticorrosion coating 3, which is a target to be detected by the anticorrosion performance deterioration detection sensor 100, is formed on the entire inner surface of the pipe line in contact with the liquid 2 in the pipe line. It is what is done. The anticorrosion performance deterioration detection sensor 100 employs a method of adding a corrosion inhibitor that forms the anticorrosion coating 3 to the liquid 2 in the pipeline.
Since the formation mechanism of the anticorrosion film 3 by the corrosion inhibitor varies depending on the material of the object forming the anticorrosion film 3, it is preferable to use an optimum corrosion inhibitor depending on the material constituting the object.

Corrosion inhibitors include, for example, “precipitation coating type corrosion inhibitors such as benzotriazole and 8-quinolinol”, “adsorption coating type corrosion inhibitor such as tetraalkylammonium”, and “sodium nitrite, sodium molybdate, polyphosphoric acid”. It is preferable to employ an oxide film type corrosion inhibitor such as sodium.
For example, when the object is made of copper, a precipitation film type such as benzotriazole is adopted as a corrosion inhibitor, and when the object is made of iron, an oxide film such as sodium nitrite is used. A mold corrosion inhibitor may be employed.

[About the anticorrosion coating destruction device 6]
FIG. 2 is an explanatory diagram of an example of the anticorrosion film destruction apparatus in the anticorrosion performance deterioration detection sensor according to Embodiment 1. FIG. 3 is a diagram illustrating an example of the shape of the rotating body 6a in the anticorrosion performance deterioration detection sensor 100 according to the first embodiment. FIG. 4 is a diagram illustrating an example of the rotation control mechanism of the rotating body 6a of the anticorrosion film destruction apparatus 6 in the anticorrosion performance deterioration detection sensor 100 according to the first embodiment. In FIG. 2, the rotating body 6 a is a cylinder, and in FIG. 4, the rotating body 6 a is a triangular prism, but this schematically shows the rotating body 6 a shown in FIG. 3. The anticorrosion film destruction apparatus 6 will be described in detail with reference to FIGS.
The anticorrosion coating film breaking device 6 includes a rotating body 6a, a rotating shaft 6b installed on a rotating central axis of the rotating body 6a extending from two surfaces perpendicular to the rotating central axis of the rotating body 6a, And a flow rate detector 6d for detecting the flow of the liquid 2. In addition, the anticorrosion film destruction apparatus 6 has the rotating shaft fixing device 6c1 or the rotating body fixing tool 6c2 used for switching whether to rotate the rotating shaft 6b.

The rotating body 6a has a convex portion 6a1 in which a part of a surface parallel to the rotating shaft 6b is convex, rotates by receiving the flow of the liquid 2 in the duct, and the convex portion 6a1 at the time of the rotation. Can come into contact with the anticorrosion coating 3 on the surface of the sensor electrode 5 to break the anticorrosion coating 3.
The rotating body 6a has a shape that can be rotated in a certain direction by the liquid 2 in the pipe flow having a uniform flow. For example, a rotating body having a shape obtained by processing an elliptical cylinder as shown in FIG. 3 can be used. That is, the rotating body 6a has a flat plate portion 6a2 that is a planar member, a convex portion 6a1 formed on the peripheral portion of the flat plate portion 6a2, and a protruding portion 6a3 formed on both surfaces of the flat plate portion 6a2. Is. The rotating body 6a has a cross-sectional shape perpendicular to the rotating shaft 6b such that the peripheral edge of the flat plate portion 6a2 and the protruding side end of the protruding portion 6a3 are on an elliptical locus. It is.

One of the lengths between the protruding portion 6a3 formed on the flat plate portion 6a2 and the end portion of the flat plate portion 6a2 parallel to the rotation shaft 6b is defined as x, and the other is defined as y. As shown in FIG. 3, the protruding portion 6a3 is formed on the flat plate portion 6a2 so that the relationship between x and y is x> y. As a result, the combined moment of rotation of the rotating body 6a due to the flow of the liquid 2 in the pipe line hitting the rotating body 6a becomes a component of “rotation direction of 6a” shown in FIG. In this way, the rotating body 6a receives the flow of the liquid 2 in the duct via the flat plate portion 6a2 and the protruding portion 6b3 and rotates in a certain direction.
Further, the shape of the rotating body 6a is not limited to the shape shown in FIG. That is, the rotator 6a may be of any shape that can be rotated by the flow of the liquid 2 in the duct and can destroy the anticorrosion coating 3 by the rotation. For example, the rotator 6a has various shapes such as a cylinder, a triangular prism, a spherical body, and a rectangular parallelepiped. Can be used.

  From the viewpoint of the accuracy of impedance measurement, the area of the anticorrosion coating 3 on the surface of the sensor electrode 5 to be broken by the rotating body 6a is about 5% of the entire surface area of the anticorrosion coating 3 on the surface of the sensor electrode 5. As an influence on the impedance value due to the destruction of the coating, the area ratio of the broken portion with respect to the entire area of the anticorrosion coating 3 becomes a problem rather than the absolute area value where the anticorrosion coating 3 is broken. Therefore, the area ratio of the anticorrosion coating 3 on the surface of the sensor electrode 5 that can be broken by the rotating body 6a can be increased by reducing the area of the sensor electrode 5 or increasing the convex portion of the rotating body 6a. It is considered that the accuracy of impedance measurement can be increased.

One end of the rotary shaft 6b is supported by a bearing made of an insulating member 4 installed in the pipe 1, and the other end is connected to a rotary shaft fixing device 6c1 installed across the pipe 1.
The flow rate detector 6d is installed in the pipe 1 in the vicinity of the anticorrosion performance deterioration detection sensor 100, and determines whether or not the liquid 2 in the pipeline has a sufficient flow to rotate the rotating body 6a. It is. The flow rate detector 6d may be any one that can be installed in the pipe 1 and can detect the flow rate of the liquid 2 in the pipeline, and a general flow switch for piping can be used.

The rotation shaft fixing device 6c1 controls rotation by fixing or releasing the rotation shaft 6b. Specifically, the rotating shaft fixing device 6c1 side of the rotating shaft 6b penetrates the pipe 1, and the penetrating portion is connected to the rotating shaft fixing device 6c1. The rotating shaft fixing device 6c1 fixes the rotating shaft 6b so that the rotating shaft 6b does not rotate when it is not necessary to cause the destruction of the anticorrosion coating 3 by the rotating body 6a, and when the rotating body 6a needs to be rotated. Is to release the fixing of the rotating shaft 6b so that the rotating shaft 6b rotates.
The mechanism of the rotating shaft fixing device 6c1 is not particularly limited, but when the rotating body 6a is made of, for example, a ferromagnetic material, it may be configured as follows.
In other words, the rotating shaft fixing device 6c1 is preferably provided with a magnet, and is configured to switch whether or not the rotating body 6a and the rotating shaft 6b are rotated by a magnetic force acting between the magnet and the rotating body 6a. Thereby, one end of the rotating shaft 6b on the rotating shaft fixing device 6c1 side can be supported by the bearing made of the insulating member 4 installed on the inner surface of the pipe 1 like the other end, and a through hole is formed in the pipe 1 Without rotation, the rotation of the rotating body 6a can be fixed by the magnetic force.
And when rotation of the rotary body 6a is required, the magnet installed in the rotating shaft fixing device 6c1 is moved away from the rotary body 6a, and the magnetic force acting between the rotary body 6a and the magnet is weakened, thereby rotating the rotary body 6a. Can be rotated.

As a method of controlling the rotation of the rotating body 6a, in addition to the method of fixing the rotating shaft 6b using the rotating shaft fixing device 6c1 as described above, the rotating body fixing tool 6c2 installed in the pipe 1 shown in FIG. Can also be used.
When fixing the rotation, the rotating body fixing tool 6c2 fixes the rotating body 6a so that the rotating body 6a is not rotated as shown in FIG. 4A. It is. In addition, when the rotation body fixing tool 6c2 needs to be rotated, the rotation body fixing tool 6c2 can be separated from the rotation body 6a as shown in FIG. 4B so that the rotation body 6a can be rotated. is there.
That is, the rotating body fixture 6c2 is provided to be movable in the radial direction of the pipe 1. Then, as shown in FIG. 4A, the rotating body fixture 6c2 contacts the rotating body 6a and fixes the rotating body 6a so that it does not rotate when it is located on the radial center side of the pipe 1. The rotating body fixture 6c2 comes into contact with the rotating body 6a when moved from the position on the radial center side of the pipe 1 shown in FIG. 4 (a) to the position on the radially outer side of the pipe 1 shown in FIG. 4 (b). Without rotating, the rotating body 6a can be rotated.

  In addition, as a power source of the rotating shaft fixing device 6c1 and the rotating body fixing tool 6c2, a method using the flow of the liquid 2 in the pipe line can be used, and a manual type that is manually moved by an operator or the like can be used. Alternatively, a system using an actuator such as a servo motor, a pneumatic type, or a hydraulic type can be used.

  Since the anticorrosion film destroying device 6 has the above-described configuration, the anticorrosion film destruction device 6 operates accurately in response to a command for destroying the anticorrosion film 3 on the surface of the sensor electrode 5 from the anticorrosion performance deterioration detection device 10. Can be destroyed. Specifically, when a command for destroying the anticorrosion coating 3 on the surface of the sensor electrode 5 is issued from the anticorrosion performance deterioration detection device 10, the flow of the liquid 2 in the pipeline is monitored by the flow rate detector 6d. When the flow of the liquid 2 in the pipeline is insufficient to rotate the rotating body 6a, the flow rate detector 6d has a flow sufficient to rotate the rotating body 6a. Continue monitoring the flow rate until When the flow rate detector 6d determines that the flow of the liquid 2 in the pipe line is sufficient to rotate the rotating body 6a, the rotating body 6a is fixed by the rotating shaft fixing device 6c1 or the rotating body fixing tool 6c2. Is released. As a result, the rotator 6a is rotated by the flow of the liquid 2 in the duct, and the anticorrosion coating 3 on the surface of the sensor electrode 5 is destroyed. And after predetermined time progress, the rotary body 6a is fixed by the rotating shaft fixing device 6c1 or the rotary body fixing tool 6c2, the rotation is stopped, and the destruction of the anticorrosion coating 3 is stopped.

[Demonstration result of operation of anticorrosion performance degradation detection sensor 100]
FIGS. 5 and 6 are diagrams showing changes over time in the impedance Z before and after destruction of the anticorrosion film measured by the anticorrosion performance deterioration detection sensor 100 according to Embodiment 1. FIG. FIG. 5 is a diagram showing a change with time of the impedance Z when the corrosion inhibitor is not deteriorated, and FIG. 6 is a diagram showing a change with time of the impedance Z when the corrosion inhibitor is deteriorated.
In FIG. 5, the liquid in the pipe line in which the corrosion inhibitor is not deteriorated is used, and in FIG. 6, the liquid in the pipe line in which the corrosion inhibitor is completely deteriorated is used. As impedance measurement conditions, the amplitude of the applied AC voltage was 10 mV, and the frequency was 10 Hz.

  As shown in FIG. 5, when the corrosion inhibitor is not deteriorated, the impedance is increased immediately after the impedance is reduced due to the destruction of the anticorrosion coating. On the other hand, when the corrosion inhibitor of FIG. 6 is deteriorated, such an increase in impedance is not observed. As shown in [Explanation of the operation of the anticorrosion performance deterioration detection sensor 100], the difference in the change with time of impedance before and after the destruction of the anticorrosion coating reflects the presence or absence of deterioration of the corrosion inhibitor. That is, when the corrosion inhibitor of FIG. 5 is not deteriorated, it is considered that the ability of the corrosion inhibitor to re-form the anticorrosion film is sufficient, and the re-formation of the film occurred at the destruction portion of the anticorrosion film. On the other hand, when the corrosion inhibitor of FIG. 6 is deteriorated, it is considered that the ability of the corrosion inhibitor to re-form the anticorrosion film is lost, and the re-formation of the film does not occur at the destruction portion of the anticorrosion film.

[Effect of anticorrosion performance deterioration detection sensor 100 according to Embodiment 1]
The anticorrosion performance deterioration detection sensor 100 according to the first embodiment can clearly determine the presence or absence of deterioration of the corrosion inhibitor using the ability to re-form the anticorrosion film as an index, and the deterioration of the anticorrosion film occurs on the entire pipe. The previous state can be detected.

Embodiment 2. FIG.
FIG. 7 is a diagram illustrating an example of a schematic configuration of a water circulation system 200 including the anticorrosion performance deterioration detection sensor 100 according to the second embodiment. In the second embodiment, the difference from the first embodiment will be mainly described. In the second embodiment, the anticorrosion performance deterioration detection sensor 100 according to the first embodiment is mounted on the water circulation system 200.
The water circulation system 200 can use the heat generated by the heat source machine to supply hot water to a bath, a washroom, a kitchen, or the like, or to heat a room, for example. The anticorrosion performance deterioration detection sensor 100 in the water circulation system 200 can detect a state before deterioration occurs in a wide range of the anticorrosion coating formed on the inner surface of the conductive pipe of the water circulation system 200.

[Configuration of water circulation system 200]
As shown in FIG. 7, the water circulation system 200 includes a liquid 2 in the pipeline, a cooling target material 12, a circulation pump 13, and inner surface anticorrosion pipes 11 connected to both ends where the cooling target material 12 and the circulation pump 13 are connected. And the anti-corrosion performance deterioration detection sensor 100 attached to the inner surface anti-corrosion pipe 11.

The in-pipe liquid 2 is a coolant or the like that flows in a pipe made of the inner surface anticorrosion pipe 11, and a corrosion inhibitor that forms the anticorrosion coating 3 on the inner surface of the inner surface anticorrosion pipe 11 is added. What added salts other than corrosion inhibitors, such as an antifreeze, can be used according to a use.
The inner surface anticorrosion pipe 11 includes the conductive pipe 1 and the anticorrosion coating 3 in FIG.
The material 12 to be cooled includes an indoor / outdoor heat exchanger that efficiently transfers heat between an object having a high temperature and an object having a low temperature, a radiator that dissipates excess heat generated, and an in-pipe liquid for circulation supply. This corresponds to a hot water tank for storing 2.
The circulation pump 13 circulates the liquid 2 in the pipe flowing through the pipe consisting of the inner surface anticorrosion pipe 11 and the cooling target material 12.

  In addition, regarding the configuration of the anticorrosion performance deterioration detection sensor 100 in the water circulation system 200 according to the second embodiment, the anticorrosion performance deterioration detection sensor according to the first embodiment shown in [Configuration of the anticorrosion performance deterioration detection sensor 100] described above. The same configuration as 100 can be used.

[Description of operation of water circulation system 200]
FIG. 8 is a flowchart of the anticorrosion performance deterioration determination by the water circulation system 200 including the anticorrosion performance deterioration detection sensor 100 according to the second embodiment. In the water circulation system 200 according to Embodiment 2, the in-pipe liquid 2 is circulated through the inner surface anticorrosion pipe 11 and the cooling target material 12 by the circulation pump 13 to heat or cool the cooling target material 12. The anticorrosion performance deterioration detection sensor 100 in the water circulation system 200 detects the state before the deterioration of the anticorrosion coating 3 formed over a wide range of the inner surface of the inner surface anticorrosion pipe 11 that is the circulation path of the liquid 2 in the pipe line. be able to.

Specifically, the water circulation system 200 performs the following operation.
The anticorrosion film destruction apparatus 6 destroys the anticorrosion film 3 on the surface of the sensor electrode 5 in the anticorrosion performance deterioration detection sensor 100 (step S1). And the impedance measuring device 9 measures the time-dependent change of the impedance before and behind (step S2). Thereafter, anticorrosive performance deterioration detecting apparatus 10, [anticorrosion Operation of performance degradation detection sensor 100] obtains a film re-formation rate V shown in (a this time V = V _1), the corrosion inhibitor according to the value of V It is determined whether or not there is any deterioration (step S3).

  When the anticorrosion performance deterioration detection device 10 determines that the corrosion inhibitor is deteriorated (step S4), the occurrence of a state in which the anticorrosion film is deteriorated is prevented by replenishment of the corrosion inhibitor. Can do.

When the anticorrosion performance deterioration detection device 10 determines that the corrosion inhibitor is not deteriorated (step S5), after a certain time, the impedance is measured again to obtain the film re-forming speed V (at this time V = V ₂ ), the presence or absence of deterioration of the corrosion inhibitor is determined (step S6).
When it is determined that the corrosion inhibitor has deteriorated in this step S6, the anticorrosion performance deterioration detection device 10 has caused the occurrence of a state in which the anticorrosion coating is deteriorated by the same action as in the above step S4. Can be prevented.
When it is determined that the corrosion inhibitor has not deteriorated in this step S6, the anticorrosion performance deterioration detecting device 10 returns to the above step S1 and repeats the operation.

Thus, the presence or absence of deterioration of the corrosion inhibitor can be determined by the control in steps S1 to S6. Further, as described below, in addition to the control in steps S1 to S6, the control in steps S7 and S8 in FIG. 8 may be performed.
That is, in step S6 are illustrated as returning to step S1, instead of returning to step S1 At step S6, V ₁ and by comparing the V _2, after grasping the deteriorated condition of the corrosion inhibitor (step S7, S8) Returning to step S1, the operation may be repeated. Specifically, the deterioration state of the corrosion inhibitor is grasped depending on whether V ₁ > V ₂ is satisfied (step S7) or V ₁ = V ₂ is satisfied (step S8).

In the case of V ₁ = V ₂ , it means that the corrosion inhibitor has not deteriorated at all.
On the other hand, in the case of V ₁ > V ₂ , there is an ability to re-form the anticorrosion film by the corrosion inhibitor, but the deterioration has started and it is necessary to take measures such as shortening the determination interval. Thus, before returning to step S1, it is possible to grasp a sign of deterioration of the corrosion inhibitor by determining whether V ₁ = V ₂ or V ₁ > V ₂ .
Further, it is also possible to predict the time when all the ability to re-form the anticorrosion coating by the corrosion inhibitor disappears from the change with time of the coating re-forming rate at each determination.

  Further, in the water circulation system 200 provided with the anticorrosion performance deterioration detection sensor 100 according to the second embodiment, there is a possibility that a water quality change or a temperature change may occur in the liquid 2 in the pipeline, but the water circulation system according to the second embodiment. Since the anticorrosion performance deterioration detection sensor 100 in 200 can use the same structure as the anticorrosion performance deterioration detection sensor 100 according to Embodiment 1 described in [Configuration of the anticorrosion performance deterioration detection sensor 100], the pipe The influence of water quality change and temperature change in the in-path liquid 2 is separated, and the state before the anti-corrosion coating 3 is deteriorated is detected for the entire pipe using the presence or absence of deterioration of the corrosion inhibitor added to the in-pipe liquid 2 as an index. can do.

[Effects of water circulation system 200 according to Embodiment 2]
The water circulation system 200 according to the second embodiment is provided with the anticorrosion performance deterioration detection sensor 100, so that the influence of the water quality change and temperature change due to the contamination of the liquid in the pipe line 2 is separated, and the liquid in the pipe line is separated. Using the presence or absence of deterioration of the corrosion inhibitor added to 2 as an index, the state before deterioration of the anticorrosion coating 3 can be detected for the entire pipe.

Embodiment 3 FIG.
FIG. 9 is an explanatory diagram of an example of the anticorrosion film breaking device 6 in the anticorrosion performance deterioration detection sensor according to the third embodiment. In the third embodiment, the difference from the first and second embodiments will be mainly described.
In the anticorrosion performance deterioration detection sensor 100 according to the first and second embodiments, the rotational power source of the rotating body 6a of the anticorrosion film destruction apparatus 6 is the flow of the liquid 2 in the pipe line. In the third embodiment, a motor is used as a rotational power source.
The anticorrosion film destruction apparatus 6 according to the third embodiment includes a rotating body 6a and a rotation installed on the rotating central axis of the rotating body 6a extending from two surfaces perpendicular to the central axis of rotation of the rotating body 6a. It has a shaft 6b and a motor 6e.

  The structure of the rotary body 6a and the rotating shaft 6b can use the same structure as the above-mentioned [about anticorrosion film destruction apparatus].

  The motor 6e is connected to one end of the rotating shaft 6b that penetrates the pipe 1, and rotates the rotating body 6a. At this time, the other end of the rotating shaft 6 b is supported by a bearing made of an insulating member 4 installed on the inner surface of the pipe 1. When a ferromagnet is used as the rotating body 6a, a magnet is installed in the rotating part of the motor 6e, and one end of the rotating shaft 6b on the motor 6e side is supported by a bearing made of an insulating member 4 installed on the inner surface of the pipe 1. By doing so, the rotation of the motor 6e can be transmitted by the magnetic force and the rotating body 6a can be rotated without forming a through hole in the pipe 1.

  Regarding the configuration of the anticorrosion performance deterioration detection sensor according to the third embodiment other than the anticorrosion film destruction apparatus 6 configured by the rotating body 6a, the rotation shaft 6b, and the motor 6e, the above-mentioned [corrosion protection performance deterioration detection sensor 100] is described. The same configuration as the anticorrosion performance deterioration detection sensor 100 according to the first embodiment shown in [Configuration] can be used.

[Effect of anticorrosion performance deterioration detection sensor according to Embodiment 3]
The anticorrosion performance deterioration detection sensor according to the third embodiment is formed on the surface of the sensor electrode 5 by using the motor 6e instead of using the flow of the liquid 2 in the duct as the rotational power source of the rotating body 6a. The anticorrosion coating 3 can be destroyed.
Therefore, with the anticorrosion performance deterioration detection sensor according to the third embodiment, the anticorrosion film 3 on the surface of the sensor electrode 5 is destroyed, and the ability to re-form the film by the impedance change accompanying the film destruction / reformation is used as an index. Since the presence or absence of deterioration of the corrosion inhibitor can be detected, the state before the deterioration of the anticorrosion coating can be detected.

Embodiment 4 FIG.
FIG. 10 is an explanatory diagram of an example of the anticorrosion film destruction apparatus in the anticorrosion performance deterioration detection sensor according to the fourth embodiment. In this Embodiment 4, it demonstrates centering on difference with Embodiment 1-3.
The rotational power source of the rotating body 6a of the anticorrosion film destruction apparatus 6 in the anticorrosion performance degradation detection sensor 100 is not limited to the flow of the liquid 2 in the pipeline and the motor 6e, but is manually operated as in the third embodiment. Also good.
The anticorrosion film destruction apparatus 6 according to the fourth embodiment includes a rotating body 6a and a rotation installed on the rotating central axis of the rotating body 6a extending from two surfaces perpendicular to the rotating central axis of the rotating body 6a. It has a shaft 6b and a rotation handle 6f.

  The structure of the rotary body 6a and the rotating shaft 6b can use the same structure as the above-mentioned [about anticorrosion film destruction apparatus].

The rotating handle 6f is connected to one end of a rotating shaft 6b that penetrates the pipe 1, and the rotating body 6a can be rotated by manually rotating the rotating handle. At this time, the other end of the rotating shaft 6 b is supported by a bearing made of an insulating member 4 installed on the inner surface of the pipe 1.
When a ferromagnet is used as the rotating body 6a, a magnet is installed in the rotating portion of the rotating handle 6f, and one end of the rotating shaft 6b on the rotating handle 6f side is provided from the insulating member 4 installed on the inner surface of the pipe 1. By being supported by the bearing, the rotation of the rotating handle 6f can be transmitted by the magnetic force and the rotating body 6a can be rotated without forming a through hole in the pipe 1.

  Regarding the configuration of the anticorrosion performance deterioration detection sensor according to Embodiment 4 other than the anticorrosion film destruction apparatus 6 constituted by the rotating body 6a, the rotation shaft 6b, and the rotation handle 6f, the above-mentioned “corrosion prevention performance deterioration detection sensor” is described. 100 configuration], the same configuration as the anticorrosion performance deterioration detection sensor 100 according to Embodiment 1 can be used.

[Effect of anticorrosion performance deterioration detection sensor according to Embodiment 4]
Even when the anticorrosion film destruction apparatus 6 including the rotating body 6a, the rotation shaft 6b, and the rotation handle 6f is used, the anticorrosion film 3 formed on the surface of the sensor electrode 5 is destroyed. Can do. Therefore, with the anticorrosion performance deterioration detection sensor according to Embodiment 4, the anticorrosion film is destroyed, and the impedance change accompanying the film destruction / reformation is used to determine whether or not the corrosion inhibitor has deteriorated using the ability to re-form the film as an index. Since it can detect, the state before degradation of an anticorrosion film can be detected.

Embodiment 5 FIG.
FIG. 11 is an explanatory diagram of an example of the anticorrosion film breaking device in the anticorrosion performance deterioration detection sensor according to the fifth embodiment. In the fifth embodiment, the difference from the first to fourth embodiments will be mainly described.
The anticorrosion film destruction apparatus 6 in the anticorrosion performance deterioration detection sensor 100 is not limited to the rotating body 6a, and it is also possible to use the anticorrosion film destruction apparatus 6 constituted by other than the rotating body as in the fourth embodiment. is there.
The anticorrosion film destruction apparatus 6 according to Embodiment 5 includes a film destruction body 306a, an in-pipe installation magnet 306b1, an out-pipe installation magnet 306b2, and a power source 306c.

One end side of the coating film breaker 306a is in contact with the anticorrosion coating 3 on the surface of the sensor electrode 5, and is moved in a direction parallel to the surface of the sensor electrode 5 by the power source 306c. be able to. That is, the other end side of the coating film breaking body 306a is connected to the in-pipe installation magnet 306b1, and the coating destruction body 306a also moves with the movement of the in-pipe installation magnet 306b1 to destroy the anticorrosion coating 3 on the surface of the sensor electrode 5. be able to.
Since the coating film breaker 306a is in contact with the liquid 2 in the pipe line, it is made of a metal that has high electrochemical stability and is not easily corroded. Specifically, it may be composed of an electrochemically noble metal such as gold, platinum, titanium, copper, and stainless steel.

The in-pipe installed magnet 306b1 and the out-pipe installed magnet 306b2 are magnets, and the in-pipe installed magnet 306b1 is fixed to the coating film breaker 306a, and the out-pipe installed magnet 306b2 is fixed to the power source 306c.
In addition, the magnet installed in the pipeline 306b1 and the magnet installed outside the pipeline 306b2 are installed so that different poles face each other, and a magnetic force acts between them, so that the magnet is installed outside the pipeline. The power from the power source 306c is transmitted to the coating destruction body 306a installed in the pipeline. In addition, the coating film destruction body 306a and the power source 306c are physically connected through the pipe 1 so that the power from the power source 306c installed outside the pipeline is installed in the pipeline. It can also be transmitted to 306a.

  The power source 306 c is a power source for moving the coating destruction body 306 a in a direction parallel to the surface of the sensor electrode 5. Specifically, an actuator such as a servo motor, a pneumatic type, a hydraulic type, or a manual type can be used.

  Moreover, the anticorrosion performance deterioration detection sensor according to the fifth embodiment other than the anticorrosion film destruction apparatus 6 including the film destruction body 306a, the pipe installation magnet 306b1, the pipe installation magnet 306b2, and the power source 306c. About the structure of this, the same structure as the anticorrosion performance degradation detection sensor 100 which concerns on Embodiment 1 shown in the above-mentioned [Structure of the corrosion protection performance degradation detection sensor 100] can be used.

[Effect of anticorrosion performance deterioration detection sensor according to Embodiment 5]
The anticorrosion performance deterioration detection sensor according to the fifth embodiment includes an anticorrosion film destruction apparatus 6 including a film destruction body 306a, an in-pipe installation magnet 306b1, an out-pipe installation magnet 306b2, and a power source 306c. And the anticorrosion coating 3 formed on the surface of the sensor electrode 5 can be destroyed.
Therefore, the anticorrosion performance deterioration detection sensor according to Embodiment 5 breaks down the anticorrosion film, and the presence or absence of deterioration of the corrosion inhibitor by using the impedance change accompanying the film destruction / reformation as an index. Therefore, it is possible to detect the state before the deterioration of the anticorrosion coating.

Embodiment 6 FIG.
FIG. 12 is a diagram illustrating an example of a control mechanism for the flow of the liquid 2 in the pipeline using a valve in the anticorrosion performance deterioration detection sensor according to the sixth embodiment. FIG. 13 is an explanatory diagram of an example of the anticorrosion film breaking device 6 in the anticorrosion performance deterioration detection sensor according to the sixth embodiment.
FIG. 12 is a view of the pipe 1 as viewed from above, and FIG. 13 is a view of the pipe 1 as viewed from the side. 12 (a) and 13 (a) are diagrams in a state where the valve 14 is closed, and FIGS. 12 (b) and 13 (b) are diagrams in a state where the valve 14 is opened. Further, FIG. 12A and FIG. 13A correspond to each other, and FIG. 12B and FIG. 13B correspond to each other. In the sixth embodiment, the difference from the first to fifth embodiments will be mainly described.
The anticorrosion film destruction device 6 in the anticorrosion performance deterioration detection sensor is not limited to the rotating body 6a, and the anticorrosion film destruction device 6 using the movement of the valve 14 for controlling the flow of the liquid 2 in the pipe 1 in the pipe 1. It is also possible to use.

  The anticorrosion film destruction apparatus 6 of the anticorrosion performance deterioration detection sensor according to the sixth embodiment can rotate, and the valve 14 that controls the flow of the liquid 2 in the pipe line and the film destruction body attached to the valve 14. 15. The anticorrosion film destruction apparatus 6 of the anticorrosion performance deterioration detection sensor according to the sixth embodiment is configured such that when the flow of the liquid 2 in the pipe line is stopped, the valve flow path is changed to a pipe flow path as shown in FIG. When flowing the liquid 2 in the pipe line, the flow path of the valve is rotated so as to be parallel to the flow path of the pipe as shown in FIG. The anticorrosion performance deterioration detection sensor according to the sixth embodiment is provided with an anticorrosion coating destruction device 6 that uses the movement of the valve to destroy the anticorrosion coating 3 on the surface of the sensor electrode 5.

The valve 14 has “a communication part 14a for flowing the liquid 2 in the pipe flowing through the pipe 1 and is rotatably provided, and whether or not the communication part 14a and the pipe are communicated according to the rotational position. And a “valve body rotating shaft 14c that is connected to the valve body 14b and rotates the valve body 14b”.
The communication part 14a is a space in which the coating destruction body is installed, and is a part through which the in-pipe liquid 2 flows in the state of FIGS. 12 (b) and 13 (b). The communication portion 14 a is formed between the lower surface side of the valve body 14 b and the upper surface side of the sensor electrode 5.
The valve body 14b controls the flow of the in-pipe liquid 2 in the pipe 1, and is installed on the sensor electrode 5 as shown in FIG.
When stopping the flow of the liquid 2 in the pipe line, the valve body 14b is rotated so that the communication part 14a and the flow path of the pipe 1 are vertical as shown in FIG. When flowing, it is rotated so that the communication portion 14a and the flow path of the pipe 1 are parallel as shown in FIG.
The valve body rotation shaft 14c is a shaft connected to the upper part of the valve body 14b. As the valve body rotation shaft 14c rotates, the valve body 14b rotates and the position of the communication portion 14a is switched. Thereby, the valve 14 can switch now whether the liquid 2 in a pipe line is allowed to pass through. As a power source for rotating the valve body rotating shaft 14c, an actuator such as a servo motor, a pneumatic type, a hydraulic type, or a manual type can be used.

The coating film destruction body 15 is fixed to the valve body 14b so that one end thereof is in contact with the anticorrosion coating 3 on the surface of the sensor electrode 5. In addition, in order to destroy the anticorrosion coating 3 on the surface of the sensor electrode 5 efficiently, one end of the coating destruction body 15 is preferably fixed at a position shifted from the valve body rotation shaft 14c in the valve body 14b.
Moreover, since the coating-breaking body 15 is in contact with the liquid 2 in the pipe line, it is made of a metal that has high electrochemical stability and hardly corrodes. Specifically, it may be composed of an electrochemically noble metal such as gold, platinum, titanium, copper, and stainless steel.

  The configuration of the anticorrosion performance deterioration detection sensor according to the sixth embodiment other than the anticorrosion film destruction device 6 constituted by the valve 14 and the film destruction body 15 is shown in [Configuration of the anticorrosion performance deterioration detection sensor 100] described above. The same configuration as that of the anticorrosion performance deterioration detection sensor 100 according to the first embodiment can be used.

The coating destruction body 15 moves in contact with the anticorrosion coating 3 on the surface of the sensor electrode 5 as the valve 14 rotates to control the flow of the liquid 2 in the duct, and destroys the anticorrosion coating 3.
The impedance measurement target by the impedance measuring instrument 9 is a circuit composed of the pipe 1, the liquid 2 in the pipeline, the anticorrosion coating 3, and the sensor electrode 5. In the state of FIG. Cannot be included. Therefore, the anticorrosion film destruction by the anticorrosion performance deterioration detection apparatus 10 utilizes the movement of the valve from the state of FIG. 13A to the state of FIG. 13B, and the impedance measurement is performed in the state of FIG. 13B. There is a need to.

[Effect of anticorrosion performance deterioration detection sensor according to Embodiment 6]
The anticorrosion performance deterioration detection sensor according to the sixth embodiment includes the valve 14 and the coating destruction body 15 and can destroy the anticorrosion coating 3 formed on the surface of the sensor electrode 5.
Therefore, the anticorrosion performance deterioration detection sensor according to the sixth embodiment destroys the anticorrosion coating 3, and the deterioration of the corrosion inhibitor by using the impedance change accompanying the coating destruction / reformation as an index. Since the presence or absence can be detected, the state before the deterioration of the anticorrosion coating can be detected.

Embodiment 7 FIG.
FIG. 14 is a diagram illustrating an example of the anticorrosion performance deterioration detection sensor according to the seventh embodiment. In this Embodiment 7, it demonstrates centering on difference with Embodiment 1-6.
The anticorrosion film destroying device 6 of the anticorrosion performance deterioration detection sensor according to the seventh embodiment is “the film destruction electrode 406a installed in the pipe line so as to be in contact with the liquid 2 in the pipe line but to be insulated from the pipe 1”. And “DC power supply 406b for applying a predetermined voltage to a circuit including the liquid 2 in the pipe line, the sensor electrode 5, the anticorrosion coating 3 on the surface of the sensor electrode 5, and the coating breaking electrode 406a”. .
Note that the anticorrosion performance deterioration detection sensor according to the seventh embodiment is described as having the DC power supply 406b, but is not limited to this, and for example, a predetermined value is supplied from an external power supply or the like instead of the DC power supply 406b. You may use what took the voltage.

The electrode 406a for film destruction is an electrode for forming a circuit together with the liquid 2 in the pipe line, the anticorrosion film 3 and the sensor electrode 5, and applying a voltage to the circuit. Since the film-breaking electrode 406a is in contact with the liquid 2 in the pipe line, it is made of a metal that has high electrochemical stability and hardly corrodes. Specifically, it may be composed of an electrochemically noble metal such as gold, platinum, titanium, copper, and stainless steel.
The DC power source 406b applies a predetermined voltage to a circuit composed of the liquid 2 in the pipe line, the sensor electrode 5, the anticorrosive coating 3 on the surface of the sensor electrode 5, and the coating breaking electrode 406a. Is set to a high potential, and the sensor electrode 5 is set to a low potential. Specifically, the potential difference between the film breaking electrode 406a and the sensor electrode 5 can be about 3V.

Moreover, about the structure of the anticorrosion performance deterioration detection sensor according to Embodiment 7 other than the anticorrosion film destruction apparatus 6 composed of the film destruction electrode 406a and the DC power source 406b, the above-mentioned [corrosion protection performance deterioration detection sensor 100] is described. The same configuration as the anticorrosion performance deterioration detection sensor according to the first embodiment shown in [Configuration] can be used.
The anticorrosion coating 3 is a coating formed by a corrosion inhibitor added to the liquid 2 in the pipeline, and the stability of such a coating is determined by the potential of the coating and the pH of the liquid 2 in the pipeline. Therefore, the anticorrosion coating 3 can be made unstable and destroyed by controlling these factors (the potential of the coating and the pH of the liquid 2 in the duct). Specifically, in order to make the anticorrosion coating 3 unstable, a potential change of about 1 V is sufficient, but the anticorrosion coating 3 can be completely destroyed by generating a larger potential change of about 3 V.

[Effects of the anticorrosion performance deterioration detection sensor according to the seventh embodiment]
Since the anticorrosion film destroying device 6 of the anticorrosion performance deterioration detection sensor according to the seventh embodiment has the above-described configuration, the electric potential of the anticorrosion film 3 on the surface of the sensor electrode 5 can be displaced to the low potential side. The anticorrosion coating 3 on the surface of the sensor electrode 5 can be destroyed by the potential change.
In addition, since the potential of the sensor electrode 5 is set to a low potential, the sensor electrode 5 is not corroded by the potential application, and only the anticorrosion coating 3 can be destroyed without changing the surface state of the sensor electrode 5. Therefore, the anticorrosion performance deterioration detection sensor according to Embodiment 7 destroys the anticorrosion coating 3 on the surface of the sensor electrode 5, and corrodes with the ability to re-form the coating by the impedance change accompanying the coating destruction / reformation as an index. Since the presence or absence of the deterioration of the inhibitor can be detected, it is possible to detect the state before the anticorrosion coating is deteriorated.

Embodiment 8 FIG.
FIG. 15 is a diagram illustrating an example of the anticorrosion performance deterioration detection sensor according to the eighth embodiment. In the eighth embodiment, the difference from the first to seventh embodiments will be mainly described.
The anticorrosion film destroying device 6 of the anticorrosion performance deterioration detection sensor according to the eighth embodiment has an ultraviolet light source 506a installed on the inner surface of the duct for irradiating the anticorrosion film 3 on the surface of the sensor electrode 5 with ultraviolet light. Since the organic anticorrosion coating or the like is destroyed by irradiation with ultraviolet rays, the anticorrosion coating 3 on the surface of the sensor electrode 5 can be destroyed by the ultraviolet light source 506a.
The configuration of the anticorrosion performance deterioration detection sensor of the anticorrosion performance deterioration detection sensor according to the eighth embodiment other than the anticorrosion film destruction apparatus 6 is the same as that of the first embodiment shown in [Configuration of the anticorrosion performance deterioration detection sensor 100]. The same configuration as the anticorrosion performance deterioration detection sensor 100 can be used.

[Effects of the anticorrosion performance deterioration detection sensor according to the eighth embodiment]
The anticorrosion film destroying device 6 of the anticorrosion performance deterioration detection sensor according to the eighth embodiment has an ultraviolet light source 506 a that destroys the anticorrosion film 3 on the surface of the sensor electrode 5.
Therefore, the anticorrosion performance deterioration detection sensor according to the eighth embodiment breaks down the anticorrosion film, and the presence or absence of deterioration of the corrosion inhibitor by using the impedance change accompanying the film destruction / reformation as an index. Therefore, it is possible to detect the state before the deterioration of the anticorrosion coating.

  The contents described in Embodiments 1 to 8 can be used in appropriate combination. The present invention is not limited to the water circulation system as long as a solvent such as cooling water circulates, and can be applied to other equipment and the like.

  DESCRIPTION OF SYMBOLS 1 Pipe, 2 Liquid in pipe line, 3 Corrosion-proof coating, 4 Insulating member, 5 Sensor electrode, 6 Corrosion-proof coating destruction apparatus, 6a Rotating body, 6a1 Protruding part, 6a2 Flat plate part, 6a3 Protruding part, 6b Rotating shaft, 6b3 Protruding 6c1 Rotating shaft fixing device, 6c2 Rotating body fixing tool, 6d Flow detector, 6e Motor, 6f Rotating handle, 7 Ammeter, 8 AC power supply, 9 Impedance measuring device, 10 Anticorrosion performance deterioration detecting device, 11 Inner surface anticorrosion Piping, 12 Material to be cooled, 13 Circulation pump, 14 Valve, 14a Communication part, 14b Valve body, 14c Valve body rotating shaft, 15 Coating destruction body, 100 Anticorrosion performance deterioration detection sensor, 200 Water circulation system, 306a Coating destruction body, 306b1 Magnet installed in the pipeline, 306b2 Magnet installed outside the pipeline, 306c Power source, 406a Electrode for film destruction, 406b DC power supply, 506a UV light source, V film reforming speed.

Claims (11)

In the anticorrosion performance deterioration detection sensor that detects deterioration of the anticorrosion performance of the corrosion inhibitor that is added to the liquid flowing through the conductive pipe and forms an anticorrosion film on the inner surface of the pipe,
A sensor electrode made of the same material as the pipe, provided in the pipe so as to maintain insulation from the pipe;
An anti-corrosion film breaking device for breaking the anti-corrosion film formed on the surface of the sensor electrode by the corrosion inhibitor;
By means of impedance change before and after the anticorrosion film on the surface of the sensor electrode is destroyed by the anticorrosion film destruction apparatus, the anticorrosion performance deterioration detection apparatus detects the deterioration of the anticorrosion performance of the corrosion inhibitor,
A sensor for detecting deterioration in anticorrosion performance, characterized by comprising: The anticorrosion coating destruction device is
A rotating body that has a convex portion on the surface, and the convex portion and the anticorrosive coating of the sensor electrode come into contact with each other by rotating itself, and the anticorrosive coating of the sensor electrode is destroyed.
The anticorrosion performance deterioration detection sensor according to claim 1, further comprising: a rotating shaft connected to the rotating body and configured to rotate the rotating body. The rotating body is
The convex part is formed in the peripheral part, and a flat plate part that is rotatably connected to the rotating shaft;
The anticorrosion performance deterioration detection sensor according to claim 2, further comprising: a protrusion formed to protrude with respect to the flat surface of the flat plate portion. The anticorrosion coating destruction device is
The anticorrosion performance deterioration detection sensor according to claim 2, further comprising a motor that is connected to the rotation shaft outside the pipe and rotates the rotation shaft. The anticorrosion coating destruction device is
The anticorrosion performance deterioration detection sensor according to claim 2, further comprising a handle that is provided outside the pipe and connected to the rotating shaft, and is used to rotate the rotating shaft. The anticorrosion coating destruction device is
A coating-breaking body provided so as to contact the anticorrosion coating of the sensor electrode;
A power source for moving the film breaking body in a direction parallel to the surface of the sensor electrode,
The anticorrosion performance deterioration detection sensor according to claim 1, wherein the anticorrosive film is destroyed on the sensor electrode by moving the film destroyer in a direction parallel to the surface of the sensor electrode. The anticorrosion coating destruction device is
A valve for opening and closing the pipe;
One end side is fixed to the valve, the other end side is provided with a coating destruction body provided so as to contact the anticorrosion coating of the sensor electrode,
The anticorrosion performance deterioration detection sensor according to claim 1, wherein the anticorrosion film of the sensor electrode is destroyed by moving the film destruction body using the movement of the valve. The valve is
A valve body that has a communication portion for flowing the liquid of the pipe, is rotatably provided, and can switch whether to connect the communication portion and the pipe according to a rotation position;
A valve body rotation shaft connected to the valve body and rotating the valve body;
Have
The coating destruction body is
The anticorrosion performance deterioration detection sensor according to claim 7, wherein one end side is fixed so as to be shifted with respect to a connection position of the valve body rotation shaft in the valve body. The anticorrosion coating destruction device is
It has an electrode for film destruction installed in the pipe so as to maintain insulation from the pipe in contact with the liquid flowing through the pipe,
The anticorrosion film of the sensor electrode is destroyed by applying a predetermined voltage of a DC power source to a circuit comprising the liquid flowing through the pipe, the sensor electrode, the anticorrosion film of the sensor electrode, and the electrode for breaking the film. The anti-corrosion performance deterioration detection sensor according to claim 1. The anticorrosion coating destruction device is
An ultraviolet light source provided on the pipe and irradiating the anticorrosion film of the sensor electrode with ultraviolet light;
The anticorrosion performance deterioration detection sensor according to claim 1, wherein the anticorrosion coating on the surface of the sensor electrode is destroyed by ultraviolet irradiation. A circulation pump for conveying the liquid;
A heat transfer member heated or cooled by the liquid conveyed by the circulation pump;
Piping connecting the circulation pump and the heat transfer member;
A water circulation system, comprising the anticorrosion performance deterioration detection sensor according to any one of claims 1 to 9, which is provided in the pipe.

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