JP2018128421A - Measurement module for corrosion monitoring, measurement method for corrosion monitoring, corrosion monitoring system, and corrosion monitoring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more precisely monitor a corrosion environment in a splash adhering environment.SOLUTION: A measurement module for corrosion monitoring includes: a metal part whose base material is exposed on a sensor surface of the base material made of a metal material; a dielectric layer provided at a portion other than the metal part on the sensor surface of the base material; a conductive layer made of the metal material different from the base material; and three or more sensors for measuring current flowing between the metal part and the conductive layer. A first sensor among the sensors is arranged in a state that the sensor surface faces upward, and a third sensor among the sensors prevents droplets of a liquid containing chloride ion from adhering to the sensor surface. In addition, the adhesion of precipitation on the sensor surface is provided at least on any of the periphery or the upper part of the sensor surface by a droplet blocking part, and the sensor surface is installed in a state facing upward.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a measurement module for corrosion monitoring, a measurement method for corrosion monitoring, a corrosion monitoring system, and a corrosion monitoring method.

  In order to monitor the corrosive environment to which various metal materials including steel are exposed and the corrosion behavior of the metal material in the air, ACM (Atmospheric Corrosion) as disclosed in the following Patent Document 1 has been conventionally used. Monitor) sensor is used. In recent years, attempts have been made to measure the corrosion behavior by installing such ACM sensors inside various cases and members (see, for example, Patent Documents 2 to 4 below).

JP 2001-201451 A JP 2012-93157 A JP 2012-189475 A JP 2012-189476 A

  In recent years, it has become possible to clarify the corrosion behavior of metal materials in various environments. For example, the corrosion behavior of various metal materials is evident even in environments where liquid droplets containing chloride ions adhere (hereinafter also referred to as the “spray adhesion environment”), such as splashes of seawater or sprays containing a snow melting agent. It is requested to be.

  Here, in the droplet adhesion environment as described above, the corrosion that proceeds when the metal material is wet and the corrosion that progresses when the metal material is dried from the wet state are repeated. Therefore, in order to accurately measure the corrosion behavior of the metal material in the environment where the droplet adheres, it is important to first clarify the environment in which the corrosion of the metal material proceeds by monitoring.

  The ACM sensor as disclosed in Patent Document 1 and Patent Document 2 described above is a measuring device capable of monitoring a wet state due to condensation, rainfall, snowfall, and the like and a dry state by measuring a corrosion current. It is. In general, rain and snow (hereinafter collectively referred to as “precipitation”) in a wet state can be separated by weather data, but separation by an ACM sensor is desirable. In addition, there is a problem that the wet state due to condensation and the wet state due to liquid splash cannot be accurately separated only by installing the ACM sensor in the splash adhesion environment.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a corrosion monitoring measurement module, a corrosion monitoring module capable of more accurately monitoring a corrosive environment in a splash adhesion environment, It is to provide a measurement method for monitoring, a corrosion monitoring system, and a corrosion monitoring method.

  In order to solve the above-described problems, according to an aspect of the present invention, a metal part on which a base material is exposed on a sensor surface of a base material made of a metal material, and the metal part on the sensor surface of the base material An insulating layer provided in a portion other than the above, and a conductive layer made of a metal material different from the base material provided on the insulating layer, and the metal portion and the conductive layer It comprises three or more sensors that measure the current flowing between the body layer, and among the sensors, the first sensor is installed with the sensor surface facing upward, and among the sensors, The second sensor is installed with the sensor surface facing downward, and among the sensors, the third sensor prevents adhesion of liquid droplets containing chloride ions to the sensor surface. And a splash blocker that allows precipitation on the sensor surface Provided on at least one of around or above the surface, the sensor surface is disposed in a state facing upward, the measurement module is provided for corrosion monitoring.

  An insulating base material, and two electrodes made of a metal material to be measured, embedded in the surface of the insulating base material so as to be separated from each other at a predetermined interval, and It is preferable that a cell for measuring an impedance by passing an alternating current between the electrodes is further provided, and the cell is installed with the electrode facing upward.

  Moreover, in order to solve the said subject, according to another viewpoint of this invention, on the sensor surface of the base material which consists of metal materials, the metal part which the said base material exposes, and on the sensor surface of the said base material An insulating layer provided in a portion other than the metal portion; and a conductive layer provided on the insulating layer and made of a metal material different from the base material. Of the three or more sensors that measure the current flowing between the sensor layer and the conductor layer, the first sensor is in a state in which the sensor surface faces upward, and a liquid droplet containing chloride ions Installed in the direction of flight, the second sensor is installed with the sensor surface facing downward, and the third sensor attaches droplets of liquid containing chloride ions to the sensor surface And a splash blocker that allows precipitation on the sensor surface. The sensor is provided in at least one of the periphery and the top of the sensor, the sensor surface is directed upward, and is placed in a direction in which the droplets of liquid containing chloride ions fly, and the sensor allows the metal part to be There is provided a measurement method for corrosion monitoring, which measures a current flowing between the electrode and the conductor layer.

  Moreover, in order to solve the said subject, according to another viewpoint of this invention, on the sensor surface of the base material which consists of metal materials, the metal part which the said base material exposes, and on the sensor surface of the said base material And an insulator layer provided on a portion other than the metal portion, and a conductor layer provided on the insulator layer and made of a metal material different from the base material. 3 or more sensors for measuring a current flowing between a portion and the conductor layer, and among the sensors, the first sensor is installed with the sensor surface facing upward, Among the sensors, the second sensor is installed with the sensor surface facing downward, and among the sensors, the third sensor is a droplet of liquid containing chloride ions on the sensor surface. A splash blocker that prevents adhesion and allows precipitation on the sensor surface. The sensor surface is provided at least around or above the sensor surface, and the sensor surface is disposed in an upward direction, and the measured current is measured using the current measurement result of the sensor. A corrosion monitoring system is provided that includes an arithmetic processing unit that determines whether it is caused by droplets of liquid containing chloride ions, caused by precipitation, or caused by condensation.

  The arithmetic processing unit refers to a measurement result by the second sensor, and when the current value measured by the second sensor is equal to or greater than a predetermined threshold, the measured current is caused by the condensation. You may judge it.

  The arithmetic processing unit compares the measurement result by the first sensor, the measurement result by the second sensor, and the measurement result by the third sensor, and the current value measured by the first sensor. Is equal to or greater than a predetermined threshold, and the current value measured by the second sensor and the current value measured by the third sensor are less than the predetermined threshold, the measured current is You may judge that it originates in the splash of the liquid containing a chloride ion.

  The arithmetic processing unit compares the measurement result by the first sensor, the measurement result by the second sensor, and the measurement result by the third sensor, and the current value measured by the first sensor. And when the current value measured by the third sensor is equal to or greater than a predetermined threshold and the current value measured by the second sensor is less than the predetermined threshold, the measured current is It may be determined that it is caused by precipitation.

  The arithmetic processing unit acquires weather information data of a place where the measurement module for corrosion monitoring is installed, and based on the acquired weather information data, determines that the measured current is caused by the precipitation. Also good.

  Moreover, in order to solve the said subject, according to another viewpoint of this invention, on the sensor surface of the base material which consists of metal materials, the metal part which the said base material exposes, and on the sensor surface of the said base material And an insulator layer provided on a portion other than the metal portion, and a conductor layer provided on the insulator layer and made of a metal material different from the base material. Among the three or more sensors that measure the current flowing between the portion and the conductor layer, the first sensor is a liquid droplet containing chloride ions with the sensor surface facing upward. The second sensor is installed in a state where the sensor surface faces downward, and the third sensor is a liquid droplet containing the chloride ions on the sensor surface. A splash blocker that prevents adhesion and allows precipitation on the sensor surface is provided on the sensor. The sensor surface is provided in at least one of the periphery and the upper surface of the sensor surface, the sensor surface is directed upward, and the liquid droplets containing the chloride ions are disposed in a direction in which the droplets are splashed. The current flowing between the metal part and the conductor layer is measured, and the measured current from the measurement result of the current by the sensor is caused by the liquid droplets containing the chloride ions by the arithmetic processing unit. A corrosion monitoring method is provided that discriminates whether it is due to precipitation, due to precipitation or due to condensation.

  As described above, according to the present invention, it is possible to measure the corrosive environment more accurately in an environment in which droplets of liquid containing chloride ions adhere (spray-attached corrosive environment). Furthermore, according to the present invention, it is possible to more accurately monitor the corrosion behavior of the metal material to be measured in the splash adhesion environment.

It is explanatory drawing which showed typically the structure of the measurement module for corrosion monitoring which concerns on embodiment of this invention. It is explanatory drawing which showed typically the structure of the measurement module for corrosion monitoring which concerns on the same embodiment. It is explanatory drawing which showed typically the structure of the sensor in the measurement module for corrosion monitoring which concerns on the same embodiment. It is explanatory drawing which showed typically the structure of the sensor in the measurement module for corrosion monitoring which concerns on the same embodiment. It is explanatory drawing which showed typically an example of the measurement result by a measurement probe. It is explanatory drawing for demonstrating an example of a structure of the 3rd sensor in the measurement module for corrosion monitoring which concerns on the embodiment. It is explanatory drawing for demonstrating an example of a structure of the 3rd sensor in the measurement module for corrosion monitoring which concerns on the embodiment. It is explanatory drawing for demonstrating the measurement result of the measurement module for corrosion monitoring which concerns on the same embodiment. It is explanatory drawing which showed typically the structure of the cell of the alternating current impedance method in the measurement module for corrosion monitoring which concerns on the same embodiment. It is explanatory drawing which showed typically an example of the measurement result by the cell of an alternating current impedance method. It is explanatory drawing which showed typically the whole structure of the corrosion monitoring system which concerns on the same embodiment. It is the block diagram which showed typically an example of the structure of the arithmetic processing apparatus with which the corrosion monitoring system which concerns on the same embodiment is provided. It is the block diagram which showed typically an example of the structure of the measurement data process part with which the arithmetic processing apparatus which concerns on the same embodiment is provided. It is explanatory drawing for demonstrating the state determination process of the corrosive environment in the measurement data process part which concerns on the embodiment. It is explanatory drawing which showed typically an example of the output result of the arithmetic processing apparatus which concerns on the same embodiment. It is the block diagram which showed an example of the hardware constitutions of the arithmetic processing unit which concerns on the same embodiment.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

(Measurement module for corrosion monitoring)
Hereinafter, the measurement module for corrosion monitoring, the sensor, and the cell used for measurement by the AC impedance method according to the embodiment of the present invention will be described in detail with reference to FIGS. 1A to 7.
1A and 1B are explanatory views schematically showing the configuration of a corrosion monitoring measurement module according to the present embodiment. 2A and 2B are explanatory diagrams schematically showing the structure of the sensor in the corrosion monitoring measurement module according to the present embodiment. FIG. 3 is an explanatory view schematically showing an example of a measurement result obtained by the measurement probe. 4A and 4B are explanatory views for explaining an example of the configuration of the third sensor in the measurement module for corrosion monitoring according to the present embodiment. FIG. 5 is an explanatory diagram for explaining the measurement results of the corrosion monitoring measurement module according to the present embodiment. FIG. 6 is an explanatory view schematically showing the structure of a cell of the AC impedance method in the measurement module for corrosion monitoring according to the present embodiment. FIG. 7 is an explanatory view schematically showing an example of a measurement result obtained by a cell of the AC impedance method.

  As mentioned earlier, in the present embodiment, attention is paid to the environment (spray adhesion environment) to which liquid droplets containing chloride ions adhere. The liquid containing a chloride ion is a liquid having corrosive properties such as, for example, a splash of seawater having a chloride ion concentration of 3% or more or a spray containing a snow melting agent. In the splash adhesion environment, corrosion that proceeds when the metal material is wet and corrosion that progresses when the metal material is dried from the wet state are repeated. Therefore, in order to accurately measure the corrosion behavior of the metal material in the splash adhesion environment, it is first necessary to monitor the corrosion environment. Furthermore, it is possible to accurately separate whether the ongoing corrosion falls under the condition that the corrosion progresses in a wet state or the corrosion that progresses when drying, and the respective corrosion rates ( Or an index of corrosion rate). As a result of intensive studies by the present inventors, the inventors have arrived at a corrosion monitoring measurement module (hereinafter also simply referred to as “measurement module”) as described in detail below.

<Overall configuration of measurement module for corrosion monitoring>
A measurement module (measurement module) 10 for corrosion monitoring according to the present embodiment is a measurement module that includes three or more sensors and is used to monitor a corrosive environment when exposed to a splash adhesion environment. More preferably, the measurement module 10 according to the present embodiment also includes a cell used for measurement by the AC impedance method, and is used for monitoring the corrosion behavior of the metal material to be measured.

  Here, the droplet adhesion environment to which the measurement module 10 for corrosion monitoring according to the present embodiment is exposed is not particularly limited, but is an environment to which droplets of liquid containing chloride adhere. For example, a corrosive environment (for example, a corrosive environment located near a sandy beach or coast, a snowfall area where a snow melting agent is sprayed, etc.) to which splashes such as sea water or water containing a snow melting agent adhere can be cited. And the measurement module 10 for corrosion monitoring according to the present embodiment is capable of accurate monitoring even in a severe corrosive environment where the concentration of chloride ions in a liquid containing chloride is 1% or more in terms of mass. .

  As schematically shown in FIGS. 1A and 1B, the measurement module 10 according to the present embodiment includes at least three types of sensors 101 described in detail below. Among the sensors 101, the first sensor 101a is installed with the sensor surface 11a facing upward, and the second sensor 101b is installed with the sensor surface 11b facing downward. The third sensor 101c prevents liquid droplets containing chloride ions from adhering to the sensor surface 11c around or above the sensor surface 11c, and prevents precipitation of the sensor surface 11c. The splash blocker 107 that allows adhesion is provided, and the sensor surface 11c is installed facing upward.

  The first sensor 101a, the second sensor 101b, and the third sensor 101c have a common structure. The detailed structure of these sensors 101a to 101c will be described again below.

  When the first sensor 101a, the second sensor 101b, and the third sensor 101c operate appropriately, in the measurement module 10 according to the present embodiment, the wet state of the splash adhesion environment is dew condensation, It is possible to accurately separate whether it is due to splash or precipitation.

  Further, in the measurement module 10 according to the present embodiment, in addition to the sensor 101 as described above, a cell used for measurement by an alternating current impedance method capable of measuring the corrosion behavior of a metal material focused as a measurement object is provided. One or more are preferably provided. The detailed structure of the cell used for the measurement by the AC impedance will be described again below.

  The measurement module 10 having the above structure is configured so that droplets of liquid containing chloride ions adhere to the sensor surface 11a of the first sensor (in other words, the sensor surface 11a of the first sensor It is installed so as to face the direction in which the droplets of the liquid containing ions fly. On the other hand, the second sensor is installed with the sensor surface 11b facing downward so that rain or snow (precipitation) and liquid droplets containing chloride ions do not adhere. This reason will also be explained later. As schematically shown in FIGS. 1A and 1B, each of the sensors 101a to 101c is installed on a pedestal PL of the exposure test apparatus using holders 13a to 13c as appropriate, and then has a predetermined height relative to the horizontal plane. You may be exposed to the droplet adhesion environment so as to be inclined at an angle θ, or you may be exposed to the droplet adhesion environment horizontally (that is, at θ = 0 degrees). The degree of inclination when the measurement module 10 is exposed to the splash adhesion environment can be adjusted by, for example, the inclination angle θ of the gantry PL as shown in FIG. 1A.

  The overall structure of the measurement module 10 according to this embodiment has been briefly described above with reference to FIGS. 1A and 1B.

<Common structure of sensor 101>
Hereinafter, a structure common to the first sensor 101a, the second sensor 101b, and the third sensor 101c will be described in detail with reference to FIGS. 2A to 3.

  The first sensor 101a, the second sensor 101b, and the third sensor 101c are sensors for separating the wet state of the droplet adhesion environment caused by condensation, droplet adhesion, and precipitation. FIG. 2A and FIG. 2B It has a common structure as shown.

  As schematically shown in FIGS. 2A and 2B, the sensor 101 includes a metal material S and one surface of the metal material S (the surface on the side that functions as the sensor surface 11 on which a water film is formed in a wet state). ) And a metal portion 102 where the surface of the metal material S is exposed. In addition, the sensor 101 has an insulator layer 103 and a conductor layer 105 provided on each insulator layer 103 in a portion other than the metal portion 102 of the sensor surface 11. The conductor layer 105 is made of a metal material different from the metal material S. When a water film is formed on the sensor surface 11, a corrosion current is generated between the metal portion 102 and the conductor layer 105 due to corrosion between different metals.

Here, as a material of the insulator layer 103, any material can be used as long as it can electrically insulate between the metal material S and the conductor layer 105. . Examples of such a material include various oxides such as SiO ₂ in which various dopants are not doped. Also, the material of the metal material S and the conductor layer 105 is not particularly limited as long as it is a conductor. The metal material S is known as iron or steel, and the conductor layer 105 is known as silver (Ag). It is possible to use other metals. From each of the metal part of the metal material S and the conductor layer 105, a conductive wire LW is drawn out via a known conductive paste EP, and these conductive wires LW are connected to a known measuring instrument such as a non-resistance ammeter. Yes. In the sensor 101 having such a structure, for example, an exposed portion (that is, a metal portion) on the surface of the metal material S functions as an anode (anode), the conductor layer 105 functions as a cathode (cathode), and a water film is formed. When formed, the detection result (for example, current value) of a known measuring instrument such as a non-resistance ammeter is output as the measurement result. Depending on the combination of the metal material S and the material of the conductor layer 105, the exposed portion of the surface of the metal material S may function as a cathode (cathode) and the conductor layer 105 may function as an anode (anode).

  On the other hand, when the sensor 101 is in a dry state (a state in which moisture derived from condensation, splashes, precipitation, or the like is not attached), the metal material S and the conductor layer 105 are insulated from each other on the sensor surface. The body layer 103 remains electrically insulated. Therefore, no potential is generated between the metal part of the metal material S and the conductor layer 105, and no current is measured.

  When a water film is formed on the sensor surface due to adhesion of the metal material S and the conductor layer 105 due to rain, snow, dew, liquid droplets containing chloride, etc. (specifically 2B, in the valley portion where the metal material S is exposed (that is, when the moisture adheres to the metal portion 102), the electrical connection between the metal material S and the conductor layer 105 is electrically performed. Will be connected. As a result, a potential difference is generated between the metal material S and the conductor layer 105, a galvanic current is generated, measured by a measuring instrument such as a non-resistance ammeter, and the wet state caused by any of condensation, droplets, and precipitation. Is detected.

  That is, the sensor 101 according to the present embodiment is a so-called ACM sensor.

  In the sensor 101 as described above, the galvanic current flowing between the metal material S and the conductor layer 105 is measured as described above. Here, as schematically shown in FIG. 3, the ACM sensor is determined to be in a wet state when a current exceeding a certain threshold is measured. If the current is hardly measured (a current less than a predetermined second threshold value is measured), it is determined to be in a dry state. Here, in the present embodiment, the “precipitation” state includes not only rain and snow but also a situation in which a sleet or hail containing water falls. Further, the current threshold value for distinguishing between the wet state and the dry state is not particularly limited, but is, for example, about 1 μA.

<About the installation method of the first sensor, second sensor, third sensor>
The sensor 101 having the common structure as described above is installed, for example, on the mount PL of the exposure test apparatus in the form schematically shown in FIG. 1A. Hereinafter, the installation of the sensor 101 will be described in detail with reference to FIGS. 1A to 2B and FIGS. 4A to 5.

  As a cause of the formation of a water film on the sensor surface of the sensor 101 as described above, (1) precipitation (including rain, snow, sleet, hail, and the like) is caused in the droplet adhesion environment focused in this embodiment. There are three cases: (2) due to splash of liquid containing chloride ions such as seawater, and (3) due to condensation caused by temperature change such as temperature. Therefore, in order to measure a more accurate corrosion behavior of a metal material, it is desirable to be able to accurately determine which of the above three types the current value measured by each sensor 101 corresponds.

  Therefore, in the measurement module 10 according to the present embodiment, the sensor 101 having the common structure schematically shown in FIGS. 2A and 2B is installed as follows, so that the above three types of factors can be specified. It is possible.

  That is, in the measurement module 10 according to the present embodiment, as schematically illustrated in FIGS. 1A and 1B, the sensor 101 having the common structure schematically illustrated in FIGS. 2A and 2B is used as the first sensor 101a. However, it is installed with the sensor surface 11a facing upward. On the other hand, as the second sensor 101b, the sensor 101 having the common structure schematically shown in FIGS. 2A and 2B is installed with the sensor surface 11b facing downward.

  Furthermore, in the measurement module 10 according to the present embodiment, the third sensor 101c has a common structure as shown in FIGS. 2A and 2B, and the sensor surface 11c is protected by the droplet blocking unit 107 described later. Similar to the first sensor 101a, the sensor 101 is installed with the sensor surface 11c facing upward.

  Here, the splash blocker 107 schematically shown in FIGS. 1A, 1B, 4A and 4B prevents precipitation of liquid droplets containing chloride ions on the sensor surface 11c, or Dew condensation is allowed to adhere to the sensor surface 11c, and is provided at least around or above the sensor surface 11c. The material of the splash blocking unit 107 is not particularly limited, and any known material can be used as long as the material can block the liquid splash. For example, the material of the splash blocker 107 is preferably a transparent material that does not block sunlight, such as an acrylic plate. Further, the specific structure of the splash blocker 107 is not particularly limited, and the exposure state of the measurement module 10 to the atmosphere (for example, whether it is placed horizontally or inclined) Etc.), the direction of the source of the liquid splash, the average wind direction in the exposure environment, etc. may be determined as appropriate.

  For example, in the exposure test, the measurement module 10 is directed in the direction in which the seawater splashes, and the test piece is installed so that the sensor surface is inclined upward. In such a case, as shown in FIG. 4A and FIG. 4B, if a droplet blocking portion 107 that covers the entire sensor surface 11c is provided substantially parallel to the sensor surface 11c, adhesion of droplets to the sensor surface 11c is prevented. Can do. Further, as shown in FIGS. 4A and 4B, the splash block 107 is held on the upper part of the sensor surface 11c by, for example, four holding members 109, so that the upper and lower sides of the sensor surface 11c are opened. Further, precipitation is applied to the sensor surface 11c, and the precipitation can be easily drained from the sensor surface 11c.

  As schematically shown in FIGS. 1A and 1B, droplets of liquid containing precipitation and chloride do not adhere to the sensor surface 11b of the second sensor 101b, and only condensation can adhere. Therefore, as schematically shown in FIG. 5, the second sensor 101b generates only a current due to condensation among the above three factors.

  Further, as schematically shown in FIGS. 1A, 1B, 4A, and 4B, the third sensor 101c is provided with a splash blocker 107 at least above or around the sensor surface 11c. Therefore, liquid droplets containing chloride ions do not adhere to the sensor surface 11c, and only precipitation and condensation can adhere. Accordingly, as schematically shown in FIG. 5, the third sensor 101c generates a current caused by precipitation or a current caused by condensation among the above three factors.

  Further, as schematically shown in FIGS. 1A and 1B, the first sensor 101a has the sensor surface 11a exposed to the splash adhesion environment without any limitation, and as shown schematically in FIG. A current resulting from all of the above three factors is generated.

  In this manner, the measurement module 10 according to the present embodiment can identify the above three types of factors by appropriately arranging the sensors 101a to 101c and paying attention to which sensor the current is detected from. .

<About the cell configuration used for measurement by the AC impedance method>
Next, referring to FIG. 6 and FIG. 7, a cell (hereinafter referred to as “impedance”) that is preferably mounted together with the sensor 101 on the measurement module 10 according to this embodiment is used for measurement by the alternating current impedance method. The measurement cell is also described in detail. In addition, in FIG. 6, the cross section at the time of cut | disconnecting the structure shown in the upper stage with the AA cutting line is typically shown in the lower stage.

  The impedance measurement cell according to the present embodiment has a pair of electrodes formed using a metal material that is a target of corrosion behavior monitoring, and is formed by such electrodes and attached moisture. This is a cell for measuring impedance while changing the frequency by passing an alternating current through an electric circuit.

  The impedance measuring cell 121 is composed of an insulating base material 123 made of a predetermined material and two measurement target metals embedded in the surface of the insulating base material 123 so as to be separated from each other at a predetermined interval. And material S. In the impedance measuring cell 121, the two metal materials S function as the electrodes 125, and the impedance is measured while an alternating current is passed between the electrodes 125.

  The insulator base material 123 holds the metal material S that functions as the electrode 125. As schematically shown in FIG. 6, the insulator base material 123 has the metal material S embedded therein, and the surface of the metal material S is exposed on the surface of the insulator base material 123. . In order to keep holding the metal material S even in the splash adhesion environment, the insulator base material 123 is preferably formed of a material that does not deteriorate even in the splash adhesion environment. Such a material is not particularly limited, but known fluorine-based materials such as polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene / perfluoroalkoxy resin (PFA), and the like. It is preferable to use a resin or the like.

The metal material S functioning as the electrode 125 is embedded in the insulator base 123 so as to be separated from each other with a predetermined distance d, and the surface thereof is exposed on the surface of the insulator base 123. Yes. In addition, a conductive wire (not shown) or the like is appropriately used for each of the end surfaces of the metal material S on the side embedded in the insulator base material 123, and the conductive wire LW is attached to the conductive material LW. One end is connected to a measuring instrument including a potentiostat and a frequency response analyzer (FRA). Thus, the impedance measuring cell 121 according to the present embodiment is a cell used for measuring the corrosion rate index (1 / R _c ) or the like by the so-called AC impedance method.

The pair of electrodes 125 are opposed to each other with a separation distance d therebetween, and a conductive substance (for example, moisture caused by precipitation, condensation, droplets of liquid containing chloride, or the like) adheres between the electrodes 125. When a water film is formed, an electric circuit is generated and impedance is measured. Here, since the impedance of the generated electric circuit changes in accordance with the corrosion state of the metal material S, the index of the corrosion rate of the metal material S (1 / R _{c) is} obtained by paying attention to the time change of the measured impedance. ) Can be evaluated.

  The size of the electrode 125 made of the metal material S embedded in the insulator base 123 is not particularly limited, but the area of the electrode 125 exposed on the surface of the insulator base 123 is insulated. If the surface area of the body substrate 123 is too small, accurate measurement may be difficult. If the area of the exposed electrode 125 is too large, corrosion of the electrode 125 may occur locally. The current distribution density becomes non-uniform, and accurate electrochemical measurement may be difficult. Further, when the difference between the areas of the two electrodes 125 is large, there is a possibility that accurate impedance measurement may be difficult. Therefore, the areas of the two electrodes 125 are preferably substantially equal. The size of the electrode 125 may be set appropriately so that the above phenomenon does not occur. For example, when the size (diameter) of the insulator base material 123 is about 30 mm to 40 mm, the electrode 125 is used. May be about 10 mm square. Also, the thickness of the electrode 125 is not particularly limited, but may be about 5 mm when the thickness of the insulator base material 123 is about 10 mm to 15 mm, for example.

In the impedance measurement cell 121 according to this embodiment, the distance d between the electrodes 125 made of the pair of metal materials S is preferably about 0.3 mm to 4 mm, for example. As a result of investigations by the present inventors, by setting the size of the separation distance d to about 0.3 mm to 4 mm, an index of the corrosion rate calculated from the measurement result by the AC impedance method of the impedance measurement cell 121 (1 / It becomes clear that R _c ) shows almost the same value as the corrosion rate calculated from the change in the corrosion state of the electrode using the metal material S, and the corrosion rate can be specified more easily for the metal material S of interest. It becomes possible to do.

  In the case where the distance d is less than 0.3 mm, in a severe corrosive environment such as a droplet adhesion environment, electrical conduction is caused by a corrosion product formed between the electrodes 125, and an accurate impedance is obtained. It is likely that it will be difficult to make measurements. On the other hand, when the separation distance d exceeds 4 mm, the electrodes are not covered with a water film even when precipitation, condensation, or liquid droplets containing chloride adhere to the separation portion. There is a high possibility that it is difficult to perform accurate impedance measurement due to a situation in which the electrode 125 is not electrically conductive. The magnitude of the separation distance d between the pair of electrodes 125 is, for example, preferably 0.5 mm or more, and more preferably 1 mm or more. The distance d between the pair of electrodes 125 is more preferably 2 mm or more. The upper limit of the size of the separation distance d is more preferably 3 mm or less.

  In addition, the metal material S to be measured in the measurement module 10 according to the present embodiment is not particularly limited, and is a plate-like material made of various pure metals not containing an alloy element such as iron, copper, and zinc. It may be a plate shape made of an alloy metal containing various alloy elements.

  The impedance measurement cell 121 having the structure as shown in FIG. 6 is attached to the measurement module 10 according to the present embodiment with the electrode 125 made of the metal material S exposed.

  When the impedance measuring cell 121 having the structure shown in FIG. 6 is held so that the surface of the insulator base 123 is substantially parallel to the horizontal plane, the impedance measuring cell 121 is formed on the surface of the metal material S functioning as an electrode. The water film may be formed thick. Therefore, it is preferable to hold the impedance measurement cell 121 such that the surface of the insulator base 123 is inclined with respect to the horizontal plane.

Above, the impedance measurement cell 121 having the structure as described with reference to FIG. 6, as a result of the impedance R _c between the metal material S is measured from time to time, the corrosion rate, as shown in FIG. 7, the index It becomes possible to monitor with the time change of (1 / R _c ).

  Here, the impedance measurement cell 121 mounted on the measurement module 10 according to the present embodiment includes the impedance measurement cell 121 formed of a pair of metal materials S not including the alloy element, and the alloy element. The impedance measuring cell 121 is preferably composed of a pair of metallic materials S included. By comparing the measurement results of the respective impedance measuring cells 121, it is possible to clarify the difference in the corrosion behavior depending on the presence or absence of the alloy element, as schematically shown in FIG. As a result, it is possible to specify an alloy element that is effective to be contained in the metal material S in the splash adhesion environment. Furthermore, depending on the selection of the metal material constituting the impedance measurement cell 121, the relative superiority or inferiority of the metal A and the metal B of different types and the relative superiority or inferiority of the alloy C and the alloy D having different compositions are evaluated. You can also.

  As described above, the impedance measurement cell 121 that is preferably mounted together with the sensor 101 on the measurement module 10 according to the present embodiment has been described in detail with reference to FIGS. 6 and 7.

  By installing such an impedance measurement cell 121 together with the sensor 101, it becomes possible to more accurately compare the wet state and the corrosion behavior of the metal material.

  The corrosion monitoring measurement module 10 according to this embodiment has been described in detail above with reference to FIGS. 1A to 7.

  In addition to the sensor 101 and the impedance measurement cell 121 described above, the measurement module 10 according to the present embodiment includes, for example, a measurement probe used in a corrosion rate calculation method using a so-called resistance method, or a known electrochemical method. Other sensor groups such as a measurement probe, various sensors for measuring the adhesion amount of liquid droplets, and a measurement sensor for measuring weather conditions may be appropriately mounted.

(Corrosion monitoring system)
Next, the corrosion monitoring system according to this embodiment as described above will be described in detail with reference to FIGS.
FIG. 8 is an explanatory diagram schematically showing the overall configuration of the corrosion monitoring system according to the present embodiment. FIG. 9 is a block diagram schematically showing an example of the configuration of the arithmetic processing device provided in the corrosion monitoring system according to the present embodiment, and FIG. 10 is a measurement data processing unit provided in the arithmetic processing device according to the present embodiment. It is the block diagram which showed typically an example of the structure of. FIG. 11 is an explanatory diagram for explaining the state determination process of the corrosive environment in the measurement data processing unit according to the present embodiment, and FIG. 12 is a schematic example of the output result of the arithmetic processing apparatus according to the present embodiment. It is explanatory drawing shown in. FIG. 13 is a block diagram illustrating an example of a hardware configuration of the arithmetic processing apparatus according to the present embodiment.

<Overall configuration of corrosion monitoring system>
The corrosion monitoring system 1 according to the present embodiment mainly includes a measurement module 10 for corrosion monitoring and an arithmetic processing unit 20 as schematically shown in FIG.

  Here, since the corrosion monitoring measurement module 10 included in the corrosion monitoring system 1 according to the present embodiment is the same as that described with reference to FIGS. 1 to 7, detailed description thereof will be omitted below. .

  The arithmetic processing unit 20 controls measurement processing by the respective sensors 101a to 101c installed in the corrosion monitoring measurement module 10, and performs predetermined arithmetic processing using the measurement results by the sensors 101a to 101c. It is an apparatus for calculating various information relating to the corrosion status (mainly wet state) of a metal material.

  Specifically, the arithmetic processing unit 20 uses the current measurement results of the respective sensors 101a to 101c of the measurement module 10 to determine whether the measured current is due to a liquid droplet containing chloride ions. It can be discriminated whether it is caused by precipitation or caused by condensation.

In addition, in the measurement module 10, when the impedance measurement cell 121 is provided in addition to the sensors 101 a to 101 c, the arithmetic processing unit 20 uses the impedance measurement result obtained by the impedance measurement cell 121 to focus on the metal of interest. The corrosion rate index (1 / R _c ) of the material S is calculated, and the increase in the corrosion rate index (1 / R _c ) is caused by liquid droplets containing chloride ions or by precipitation. It is possible to accurately associate whether it is a thing or a thing caused by condensation.

  Hereinafter, the configuration of the arithmetic processing device 20 will be described in detail with reference to FIGS. 9 to 13.

<Configuration of arithmetic processing unit>
As schematically shown in FIG. 9, the arithmetic processing device 20 according to the present embodiment includes a measurement control unit 201, a data acquisition unit 203, a measurement data processing unit 205, a result output unit 207, and a display control unit. 209 and a storage unit 211 are mainly provided.

  The measurement control unit 201 is realized by, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a communication device, and the like. The measurement control unit 201 comprehensively controls measurement processing in the various sensors 101a to 101c and the impedance measurement cell 121 provided in the corrosion monitoring measurement module 10 according to the present embodiment. At this time, the measurement control unit 201 can refer to various setting conditions and the like stored in the storage unit 211 and the like described later. As a result, each of the sensors 101a to 101c and the impedance measurement cell 121 provided in the measurement module 10 can acquire various measurement data under appropriate measurement conditions. The measurement control unit 201 causes the data acquisition unit 203 to acquire various measurement data output from the measurement module 10 at predetermined time intervals in cooperation with the data acquisition unit 203 described later.

  The data acquisition unit 203 is realized by, for example, a CPU, a ROM, a RAM, a communication device, and the like. The data acquisition unit 203 acquires measurement data output from various measurement probes provided in the measurement module 10 according to the present embodiment while distinguishing from which measurement probe the measurement data is output. When the data acquisition unit 203 acquires various measurement data from the measurement module 10, the data acquisition unit 203 outputs the acquired measurement data to the measurement data processing unit 205 described later. In addition, the data acquisition unit 203 may output various measurement data acquired from the measurement module 10 to the result output unit 207 to be described later and provide it to the user. Further, the data acquisition unit 203 associates time information related to the date and time when the measurement data is acquired with various measurement data acquired from the measurement module 10, and stores the data in the storage unit 211 described later as history information. May be.

  The measurement data processing unit 205 is realized by, for example, a CPU, a ROM, a RAM, a communication device, and the like. The measurement data processing unit 205 is a processing unit that uses various measurement data output from the data acquisition unit 203 and performs various arithmetic processes on the measurement data.

  With the measurement data processing unit 205 functioning properly, the current measured by the sensors 101a to 101c of the measurement module 10 is caused by droplets of liquid containing chloride ions or by precipitation. Or whether it is due to condensation.

When the impedance measurement result by the impedance measurement cell 121 is available, the measurement data processing unit 205 uses the obtained impedance measurement result to indicate an index (1 / R) of the corrosion rate of the metal material S of interest. _c ) and calculating whether the corrosion that caused the increase in the corrosion rate index (1 / R _c ) is due to liquid droplets containing chloride ions, due to precipitation, or due to condensation Correspondence of the cause is performed.

  In addition, the measurement data processing unit 205 acquires various data useful for corrosion monitoring such as weather data from various servers provided on the network, for example, using various networks such as the Internet as necessary. It is also possible to do.

  When the measurement data processing unit 205 generates various types of information regarding the corrosion behavior of the metal body S through data processing on various types of measurement data, the measurement data processing unit 205 outputs the generated information to the result output unit 207. Further, the measurement data processing unit 205 may associate the time information related to the date and time when the information is generated with the various types of information generated, and store the information in the storage unit 211 described later as history information.

  The detailed configuration of the measurement data processing unit 205 will be described later again.

  The result output unit 207 is realized by, for example, a CPU, a ROM, a RAM, an output device, and the like. The result output unit 207 outputs various types of measurement data acquired by the data acquisition unit 203 and various types of information regarding the corrosion behavior of the metal body S generated by the measurement data processing unit 205 to the display control unit 209. As a result, various types of information regarding the corrosion behavior of the metal body S are output to a display unit (not shown) such as a display. In addition, the result output unit 207 may output various types of obtained information to devices such as various servers provided outside.

  The display control unit 209 is realized by, for example, a CPU, a ROM, a RAM, an output device, and the like. The display control unit 209 outputs various information related to the corrosion behavior of the metal body S transmitted from the result output unit 207 to an output device such as a display included in the arithmetic processing device 20 or an output provided outside the arithmetic processing device 20. Display control when displaying on a device or the like is performed. Thereby, the user of the measurement system 1 can grasp various information regarding the corrosion of the metal material S of interest on the spot.

  The storage unit 211 is realized by, for example, a RAM or a storage device included in the arithmetic processing device 20 according to the present embodiment. In the storage unit 211, various parameters, intermediate progress of processing, or various databases or programs that need to be saved when the arithmetic processing device 20 according to the present embodiment performs some processing are appropriately stored. To be recorded. In the storage unit 211, the measurement control unit 201, the data acquisition unit 203, the measurement data processing unit 205, the result output unit 207, the display control unit 209, and the like can freely execute read / write processing.

[Configuration of measurement data processing unit]
Next, the configuration of the measurement data processing unit 205 provided in the arithmetic processing device 20 according to the present embodiment will be described in detail with reference to FIGS. In the following, the configuration of the measurement data processing unit 205 will be described by taking as an example the case where the impedance measurement cell 121 is provided for the measurement module 10, but the measurement module 10 has the impedance measurement cell 121. Otherwise, the following various processes using the impedance measurement result in the measurement data processing unit 205 are not performed.

  As shown in FIG. 10, the measurement data processing unit 205 according to the present embodiment mainly includes a corrosion state determination unit 221 and a corrosion rate calculation unit 223.

  The corrosion state determination unit 221 is realized by, for example, a CPU, a ROM, a RAM, a communication device, and the like. The corrosion state determination unit 221 is measured by each of the sensors 101a to 101c using measurement data measured by the first sensor 101a, the second sensor 101b, and the third sensor 101c of the measurement module 10. Whether the current is due to droplets of liquid containing chloride ions, due to precipitation, or due to condensation.

  As described earlier with reference to FIGS. 1A, 1B, 4 and 5, in the measurement module 10 according to the present embodiment, the situation when currents are detected by the sensors 101a to 101c is different from each other. It is like that. Therefore, depending on what value the detected current value at the same time detected by each of the sensors 101a to 101c has, the measured current is caused by the splash of liquid containing chloride ions. It can be judged whether it is caused by precipitation, caused by precipitation, or caused by condensation.

  For example, the corrosion state determination unit 221 refers to the measurement result by the second sensor 101b, and determines that the measured current is caused by condensation when the measured current value is equal to or greater than a predetermined threshold value. can do.

  Further, the corrosion state determination unit 221 compares the measurement result by the first sensor 101a, the measurement result by the second sensor 101b, and the measurement result by the third sensor 101c, and (a) the first The current value measured by the sensor 101a is greater than or equal to a predetermined threshold, and (b) the current value measured by the second sensor 101b and the current value measured by the third sensor 101c are less than the predetermined threshold. In this case, it can be determined that the measured current is caused by the splash of the liquid containing chloride ions.

  Furthermore, the corrosion state determination unit 221 compares the measurement result by the first sensor 101a, the measurement result by the second sensor 101b, and the measurement result by the third sensor 101c, and (c) the first The current value measured by the sensor 101a and the current value detected by the third sensor 101c are greater than or equal to a predetermined threshold, and (d) the current value measured by the second sensor 101b is less than the predetermined threshold. In some cases, the measured current can be determined to be due to precipitation.

  In addition, the corrosion status determination unit 221 acquires weather information data of a place where the measurement module 10 is exposed to the splash adhesion environment, and the measured current is caused by rain or snow based on the acquired weather information data It is also possible to judge.

  Furthermore, the corrosion state determination unit 221 compares the measurement result by the first sensor 101a, the measurement result by the second sensor 101b, and the measurement result by the third sensor 101c, and compares all the sensors 101a to 101c. When only a current value less than a predetermined threshold is detected, the measurement module 10 can determine that it is in a dry state.

  More specifically, for example, as shown in FIG. 11, for example, the corrosion state determination unit 221 determines whether or not a current equal to or greater than a threshold value is detected by the second sensor 101b for each measurement time (determination) 1). When a current equal to or greater than the threshold value is detected by the second sensor 101b (determination 1-YES), the corrosion state determination unit 221 indicates that the current detected at the corresponding measurement time is mainly due to condensation. It can be judged.

  On the other hand, when the current greater than the threshold is not detected by the second sensor 101b (determination 1-NO), the corrosion state determination unit 221 determines that the current greater than the threshold is detected by the third sensor 101c for each measurement time. It is determined whether or not it has been detected (determination 2). When a current equal to or greater than the threshold is detected by the third sensor 101c (determination 2-YES), the corrosion state determination unit 221 determines that the current detected at the corresponding measurement time is mainly due to precipitation. Can be judged.

  On the other hand, when the current exceeding the threshold is not detected by the third sensor 101c (determination 2-NO), the corrosion state determination unit 221 determines that the current detected at the corresponding measurement time is mainly chloride. It can be judged that it originates in the splash of the liquid containing ion.

  When the corrosion state determination unit 221 determines the cause of the current detection value of the measurement data at each measurement time in this way, the obtained determination result is output to the corrosion rate calculation unit 223 described later. To do. Further, the corrosion state determination unit 221 may output the obtained determination result to the result output unit 207.

The corrosion rate calculation unit 223 is realized by, for example, a CPU, a ROM, a RAM, and the like. The corrosion rate calculation unit 223 calculates the index (1 / R _c ) of the corrosion rate of the metal material S of interest using the impedance measurement result by the impedance measurement cell 121, and the index (1 / R) of the corrosion rate. _c ) Correspondence is made between whether the corrosion resulting in the increase in ₍₂ ) is caused by droplets of liquid containing chloride ions, caused by precipitation, or caused by condensation.

More specifically, the corrosion rate calculation unit 223 calculates the reciprocal of the obtained impedance as needed using the impedance measurement result by the impedance measurement cell 121, so that the relative of the metal material S of interest is calculated. It is possible to calculate an index (1 / R _c ) of an appropriate corrosion rate. Further, the corrosion rate calculation unit 223 refers to the determination result output from the corrosion state determination unit 221, specifies the determination result of the corrosion state determination unit 221 at the measurement time of interest, and calculates the calculated corrosion rate. Correlation is made between whether the corrosion resulting in an increase in the index (1 / R _c ) is caused by droplets of liquid containing chloride, caused by precipitation, or caused by condensation .

When the corrosion rate calculation unit 223 performs the processing as described above, for example, as schematically illustrated in FIG. 12, the corrosion that has caused an increase in the calculated index of the corrosion rate (1 / R _c ) It is possible to clearly identify whether it is caused by splash of a liquid containing chloride, caused by precipitation, or caused by condensation. Further, by directly displaying the processing result as shown in FIG. 12 on a display or the like, the user of the corrosion monitoring system 1 can easily grasp the correlation between the corrosion rate and the corrosion factor. Become.

The corrosion rate calculation unit 223 outputs the obtained result to the result output unit 207 when the correlation with the corrosion rate index (1 / R _c ) and the corrosion factor at each measurement time is performed in this way. .

  Heretofore, an example of the function of the arithmetic processing device 20 according to the present embodiment has been shown. Each component described above may be configured using a general-purpose member or circuit, or may be configured by hardware specialized for the function of each component. In addition, the CPU or the like may perform all functions of each component. Therefore, it is possible to appropriately change the configuration to be used according to the technical level at the time of carrying out the present embodiment.

  A computer program for realizing each function of the arithmetic processing apparatus according to the present embodiment as described above can be produced and installed in a personal computer or the like. In addition, a computer-readable recording medium storing such a computer program can be provided. The recording medium is, for example, a magnetic disk, an optical disk, a magneto-optical disk, a flash memory, or the like. Further, the above computer program may be distributed via a network, for example, without using a recording medium.

<Hardware configuration of arithmetic processing unit>
Next, the hardware configuration of the arithmetic processing device 20 according to the embodiment of the present invention will be described in detail with reference to FIG. FIG. 13 is a block diagram for explaining a hardware configuration of the arithmetic processing unit 20 according to the embodiment of the present invention.

  The arithmetic processing unit 20 mainly includes a CPU 901, a ROM 903, and a RAM 905. The arithmetic processing device 20 further includes a bus 907, an input device 909, an output device 911, a storage device 913, a drive 915, a connection port 917, and a communication device 919.

  The CPU 901 functions as a central processing device and control device, and controls all or part of the operation in the arithmetic processing device 20 according to various programs recorded in the ROM 903, the RAM 905, the storage device 913, or the removable recording medium 921. To do. The ROM 903 stores programs used by the CPU 901, calculation parameters, and the like. The RAM 905 primarily stores programs used by the CPU 901, parameters that change as appropriate during execution of the programs, and the like. These are connected to each other by a bus 907 constituted by an internal bus such as a CPU bus.

  The bus 907 is connected to an external bus such as a PCI (Peripheral Component Interconnect / Interface) bus via a bridge.

  The input device 909 is an operation unit operated by the user, such as a mouse, a keyboard, a touch panel, a button, a switch, and a lever. The input device 909 may be, for example, remote control means (so-called remote control) using infrared rays or other radio waves, or may be an external connection device 923 such as a PDA corresponding to the operation of the arithmetic processing device 20. May be. Furthermore, the input device 909 includes, for example, an input control circuit that generates an input signal based on information input by a user using the operation unit and outputs the input signal to the CPU 901. By operating this input device 909, the user can input various data to the arithmetic processing device 20 and instruct processing operations.

  The output device 911 is configured by a device capable of visually or audibly notifying acquired information to the user. Such devices include display devices such as CRT display devices, liquid crystal display devices, plasma display devices, EL display devices and lamps, audio output devices such as speakers and headphones, printer devices, mobile phones, and facsimiles. The output device 911 outputs, for example, results obtained by various processes performed by the arithmetic processing device 20. Specifically, the display device displays the results obtained by various processes performed by the arithmetic processing device 20 as text or images. On the other hand, the audio output device converts an audio signal composed of reproduced audio data, acoustic data, and the like into an analog signal and outputs the analog signal.

  The storage device 913 is a data storage device configured as an example of a storage unit of the arithmetic processing device 20. The storage device 913 includes, for example, a magnetic storage device such as an HDD (Hard Disk Drive), a semiconductor storage device, an optical storage device, or a magneto-optical storage device. The storage device 913 stores programs executed by the CPU 901, various data, various data acquired from the outside, and the like.

  The drive 915 is a recording medium reader / writer, and is built in or externally attached to the arithmetic processing unit 20. The drive 915 reads information recorded on a removable recording medium 921 such as a mounted magnetic disk, optical disk, magneto-optical disk, or semiconductor memory, and outputs the information to the RAM 905. The drive 915 can also write a record on a removable recording medium 921 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory. The removable recording medium 921 is, for example, a CD medium, a DVD medium, a Blu-ray (registered trademark) medium, or the like. Further, the removable recording medium 921 may be a compact flash (registered trademark) (CompactFlash: CF), a flash memory, an SD memory card (Secure Digital memory card), or the like. Further, the removable recording medium 921 may be, for example, an IC card (Integrated Circuit card) on which a non-contact type IC chip is mounted, an electronic device, or the like.

  The connection port 917 is a port for directly connecting a device to the arithmetic processing device 20. Examples of the connection port 917 include a USB (Universal Serial Bus) port, an IEEE 1394 port, a SCSI (Small Computer System Interface) port, and an RS-232C port. By connecting the external connection device 923 to the connection port 917, the arithmetic processing device 20 acquires various data directly from the external connection device 923 or provides various data to the external connection device 923.

  The communication device 919 is a communication interface configured with, for example, a communication device for connecting to the communication network 925. The communication device 919 is, for example, a communication card for wired or wireless LAN (Local Area Network), Bluetooth (registered trademark), or WUSB (Wireless USB). The communication device 919 may be a router for optical communication, a router for ADSL (Asymmetric Digital Subscriber Line), or a modem for various communication. The communication device 919 can transmit and receive signals and the like according to a predetermined protocol such as TCP / IP, for example, with the Internet and other communication devices. In addition, the communication network 925 connected to the communication device 919 is configured by a wired or wireless network, for example, the Internet, a home LAN, an in-house LAN, infrared communication, radio wave communication, satellite communication, or the like. May be.

  Heretofore, an example of the hardware configuration capable of realizing the function of the arithmetic processing device 20 according to the present embodiment has been shown. Each component described above may be configured using a general-purpose member, or may be configured by hardware specialized for the function of each component. Therefore, it is possible to change the hardware configuration to be used as appropriate according to the technical level at the time of carrying out this embodiment.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Corrosion monitoring system 10 Measurement module for corrosion monitoring 20 Arithmetic processing device 101 Sensor 102 Metal part 103 Insulator layer 105 Conductor layer 107 Splash block part 121 Impedance measurement cell 123 Insulator base material 125 Electrode 201 Measurement control part 203 Data acquisition Unit 205 measurement data processing unit 207 result output unit 209 display control unit 211 storage unit 221 corrosion state determination unit 223 corrosion rate calculation unit S metal material

Claims (9)

On the sensor surface of the base material made of a metal material, the metal part from which the base material is exposed, the insulator layer provided at a site other than the metal part on the sensor surface of the base material, and the insulator layer A conductive layer made of a metal material different from that of the base material, and measuring three or more sensors for measuring a current flowing between the metal portion and the conductive layer. Prepared,
Among the sensors, the first sensor is installed with the sensor surface facing upward,
Among the sensors, the second sensor is installed with the sensor surface facing downward,
Among the sensors, the third sensor is configured to prevent a droplet of liquid containing chloride ions from adhering to the sensor surface, and a droplet blocker that allows precipitation to adhere to the sensor surface. The measurement module for corrosion monitoring, which is provided in at least one of the periphery and the upper side of the sensor and is installed with the sensor surface facing upward. An insulating base material, and two electrodes made of a metal material to be measured, embedded in the surface of the insulating base material so as to be separated from each other at a predetermined interval, and A cell for measuring the impedance by passing an alternating current between the electrodes;
The corrosion monitoring measurement module according to claim 1, wherein the cell is installed with the electrode facing upward. On the sensor surface of the base material made of a metal material, the metal part from which the base material is exposed, the insulator layer provided at a site other than the metal part on the sensor surface of the base material, and the insulator layer A conductive layer made of a metal material of a different kind from the base material, and measuring the current flowing between the metal part and the conductive layer. home,
The first sensor is installed with the sensor surface facing upward and in the direction in which droplets of liquid containing chloride ions come in,
Install the second sensor with the sensor surface facing downward,
The third sensor prevents a droplet of liquid containing chloride ions from adhering to the sensor surface, and allows a droplet blocking portion that allows the precipitation of rain on the sensor surface to be around or above the sensor surface. Provided in at least one of the above, in the state where the sensor surface is directed upward, and installed in the direction in which the droplets of liquid containing the chloride ions fly,
A measurement method for corrosion monitoring, in which a current flowing between the metal part and the conductor layer is measured by the sensor. On the sensor surface of the base material made of a metal material, the metal part from which the base material is exposed, the insulator layer provided at a site other than the metal part on the sensor surface of the base material, and the insulator layer A conductive layer made of a metal material different from that of the base material, and measuring three or more sensors for measuring a current flowing between the metal portion and the conductive layer. Prepared,
Among the sensors, the first sensor is installed with the sensor surface facing upward,
Among the sensors, the second sensor is installed with the sensor surface facing downward,
Among the sensors, the third sensor is configured to prevent a droplet of liquid containing chloride ions from adhering to the sensor surface, and a droplet blocker that allows precipitation to adhere to the sensor surface. Is provided at least around or above the sensor surface, and the sensor surface faces upward.
Using the measurement result of the current of the sensor, it is determined whether the measured current is caused by droplets of liquid containing chloride ions, caused by precipitation, or caused by condensation. An arithmetic processing unit;
A corrosion monitoring system comprising: The arithmetic processing unit includes:
The measurement result by the second sensor is referred to, and when the current value measured by the second sensor is equal to or greater than a predetermined threshold, it is determined that the measured current is caused by the condensation. Item 5. The corrosion monitoring system according to item 4. The arithmetic processing unit includes:
Comparing the measurement result by the first sensor, the measurement result by the second sensor, and the measurement result by the third sensor;
The current value measured by the first sensor is equal to or greater than a predetermined threshold, and the current value measured by the second sensor and the current value measured by the third sensor are less than the predetermined threshold. 6. The corrosion monitoring system according to claim 4, wherein the measured current is determined to be caused by droplets of the liquid containing the chloride ions. The arithmetic processing unit includes:
Comparing the measurement result by the first sensor, the measurement result by the second sensor, and the measurement result by the third sensor;
The current value measured by the first sensor and the current value measured by the third sensor are greater than or equal to a predetermined threshold value, and the current value measured by the second sensor is less than the predetermined threshold value. In the case, the corrosion monitoring system according to any one of claims 4 to 7, wherein the measured current is determined to be caused by the precipitation. The arithmetic processing unit includes:
Acquire weather information data of the place where the measurement module for corrosion monitoring is installed,
The corrosion monitoring system according to any one of claims 4 to 6, wherein it is determined that the measured current is caused by the precipitation based on the acquired weather information data. On the sensor surface of the base material made of a metal material, the metal part from which the base material is exposed, the insulator layer provided at a site other than the metal part on the sensor surface of the base material, and the insulator layer A conductive layer made of a metal material of a different kind from the base material, and measuring the current flowing between the metal part and the conductive layer. home,
The first sensor is installed with the sensor surface facing upward and in the direction in which droplets of liquid containing chloride ions come in,
Install the second sensor with the sensor surface facing downward,
The third sensor prevents a droplet of liquid containing chloride ions from adhering to the sensor surface, and allows a droplet blocking portion that allows the precipitation of rain on the sensor surface to be around or above the sensor surface. Provided in at least one of the above, in the state where the sensor surface is directed upward, and installed in the direction in which the droplets of liquid containing the chloride ions fly,
The sensor measures the current flowing between the metal part and the conductor layer,
From the measurement result of the current by the sensor by the arithmetic processing device, the measured current is caused by the splash of liquid containing the chloride ions, caused by precipitation, or caused by condensation. Corrosion monitoring method to determine whether or not.

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