JP2019211299A - Method for detecting corrosion, corrosion sensor, and corrosion detection system - Google Patents

Abstract

To provide a method for detecting a corrosion by a corrosion sensor detecting a galvanic current, the method allowing the identification of a failure in the corrosion sensor and an accurate detection of the corrosive state of a metal member.SOLUTION: The method for detecting a corrosion detects a corrosive state of a metal member, using a corrosive sensor provided with a pattern electrode made of a second conductive material above a substrate electrode made of a first conductive material with an insulating film in between, the first and second conductive materials being different materials. The method includes the steps of: corroding the substrate electrode before arranging the substrate electrode in a detection position for detecting the corrosive state of the metal member; and arranging the corrosion sensor in which the substrate electrode is corroded in the substrate electrode corrosion step, in the detection position.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a corrosion detection method, a corrosion sensor, and a corrosion detection system.

  For example, large steel structures are constructed by producing modular metal parts at a factory, transporting the metal parts to the site, storing them for a certain period of time, and then assembling them by welding or the like. In order to monitor such a corrosion situation during transportation of a metal member, for example, a corrosion sensor is installed adjacent to the metal member (see Patent Document 1).

JP2013-134111A

  By the way, in the corrosion sensor as shown in Patent Document 1, the corrosion state of the metal member is detected by detecting a galvanic current generated by corrosion of the corrosion sensor itself. For this reason, when installing a new corrosion sensor, for example, as shown in Patent Document 1, by removing an oxide film formed on the surface of the corrosion sensor, a corrosion sensor in which corrosion has not occurred Is used.

  However, if no galvanic current is flowing, it cannot be identified whether corrosion has occurred or the corrosion sensor has failed. For this reason, in the unlikely event that a corrosion sensor that has failed is installed, even though corrosion has occurred in the metal member, the galvanic current is not detected, and the metal member is unaware of the corrosion sensor failure. It becomes impossible to accurately detect the corrosion state of.

  The present invention has been made in view of the above-described problems. In a corrosion detection method, a corrosion sensor, and a corrosion detection system using a corrosion sensor that detects a galvanic current, it is possible to identify a failure of the corrosion sensor and to corrode a metal member. The purpose is to make it possible to detect the state accurately.

  The present invention adopts the following configuration as means for solving the above-described problems.

  According to a first aspect of the present invention, there is provided a corrosion sensor in which a pattern electrode formed of a second conductive material different from the first conductive material is provided on a substrate electrode formed of a first conductive material via an insulating film. A corrosion detection method for detecting a corrosion state of a member, the substrate electrode corrosion step for corroding the substrate electrode before being disposed at a detection position for detecting the corrosion state of the metal member, and the substrate electrode corrosion And a disposing step of disposing the corrosion sensor in which the substrate electrode is corroded by the process at the detection position.

  According to a second aspect of the present invention, in the first aspect of the invention, the corrosion sensor for comparison is not corroded in the placement step or the corrosion sensor for comparison is less corroded than the corrosion sensor. A configuration of arranging in addition to the sensor is adopted.

  According to a third invention, in the first or second invention, a configuration is adopted in which a recording step of recording data detected by the corrosion sensor arranged in the arrangement step in a recording unit is employed.

  According to a fourth aspect of the present invention, in any of the first to third aspects of the present invention, a configuration is adopted in which a transmission step of transmitting detection data from the corrosion sensor arranged in the arrangement step to the outside is employed.

  5th invention employ | adopts the structure which attaches a rust preventive agent side with respect to the said metal members in any one of the said 1st-4th invention.

  A sixth invention is a corrosion sensor in which a pattern electrode formed of a second conductive material different from the first conductive material is provided on a substrate electrode formed of the first conductive material via an insulating film, A configuration is adopted in which the substrate electrode is in a corrosive state in advance.

  7th invention is a corrosion detection system, Comprising: The structure provided with the corrosion sensor which is the said 6th invention, and the arithmetic processing part which detects corrosion of a metal member based on the output from the said corrosion sensor is employ | adopted. To do.

  According to the present invention, there is a step of intentionally corroding before the corrosion sensor is installed, and the corrosion state of the metal member is detected using the corroded corrosion sensor. Since a galvanic current flows through the corroded corrosion sensor, according to the present invention, the galvanic current flows through the corrosion sensor from the initial installation state. Therefore, when the galvanic current is not flowing, it can be known that the corrosion sensor has failed. Furthermore, the galvanic current changes according to the progress of corrosion. For this reason, the corrosion state of the metal member can be estimated based on the change in the galvanic current. Therefore, according to the present invention, in the corrosion detection method, the corrosion sensor, and the corrosion detection system using the corrosion sensor that detects the galvanic current, the failure of the corrosion sensor can be identified, and the corrosion state of the metal member can be accurately detected. .

It is a block diagram which shows schematic structure of the corrosion detection system used with the corrosion detection method in one Embodiment of this invention. It is a schematic block diagram of the rusted corrosion sensor with which the corrosion detection system used with the corrosion detection method in one Embodiment of this invention is equipped, (a) is a top view, (b) is the AA cross section of (a). FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the comparative corrosion sensor with which the corrosion detection system used with the corrosion detection method in one Embodiment of this invention is equipped, (a) is a top view, (b) is AA sectional drawing of (a). It is. It is a flowchart which shows the process in the corrosion detection method in one Embodiment of this invention.

  Hereinafter, an embodiment of a corrosion detection method according to the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a corrosion detection system 1 used in the corrosion detection method of the present embodiment. The corrosion detection system 1 of this embodiment is an apparatus for detecting the corrosion state of the metal member X shown in FIG. The metal member X is made of, for example, steel, and is housed inside the storage container Y together with a rust inhibitor Z that exerts a reducing action on the metal member X. FIG. 1 shows a state immediately after the installation of the corrosion detection system 1.

  As shown in FIG. 1, the corrosion detection system 1 includes a rusted corrosion sensor 2 (corrosion sensor), a comparative corrosion sensor 3 (second corrosion sensor), a control calculation unit 4 (calculation processing unit), a recording Unit 5 and communication unit 6. The rusted corrosion sensor 2 is a corrosion sensor housed inside the storage container Y together with the metal member X. FIG. 2 is a schematic configuration diagram of the rusted corrosion sensor 2, in which (a) is a plan view and (b) is an AA cross-sectional view of (a).

  As shown in FIG. 2, the rusted corrosion sensor 2 includes a substrate electrode 2a, an insulating film 2b, a pattern electrode 2c, an oxide layer 2d, a first wiring 2e, and a second wiring 2f. . The substrate electrode 2a is made of a metal material forming a member to be detected or a material containing this metal material, and is shaped like a plate. Such a substrate electrode 2a is formed of, for example, steel (first conductive material) as with the metal member X.

  The insulating film 2b is an insulating thin film formed on the substrate electrode 2a. As shown in FIG. 2A, the insulating film 2b has a plurality of slits 2b1 formed in parallel at the center. Each slit 2b1 is provided through the insulating film 2b as shown in FIG. A part of the surface of the substrate electrode 2a is exposed by these slits 2b1.

  The pattern electrode 2c is formed by patterning on the insulating film 2b, and is formed of a conductive material (second conductive material) different from the material for forming the substrate electrode 2a. For example, gold, silver, copper, aluminum, or an alloy thereof can be used as a material for forming the pattern electrode 2c. Further, carbon can be used as a material for forming the pattern electrode 2c. The pattern electrode 2c is provided in the region of the insulating film 2b where the slit 2b1 is formed, and is formed only on the insulating film 2b while avoiding the slit 2b1. That is, in the pattern electrode 2c, a plurality of slits 2c1 are formed in parallel at a position aligned with the slit 2b1 of the insulating film 2b. Such a pattern electrode 2c is provided on the substrate electrode 2a via the insulating film 2b, and is insulated from the substrate electrode 2a.

  The oxide layer 2d is formed on the surface of the substrate electrode 2a exposed by the slit 2b1 of the insulating film 2b and the slit 2c1 of the pattern electrode 2c. This oxide layer 2d is a layer formed by oxidation (corrosion) of the forming material of the substrate electrode 2a. In this embodiment, when the corrosion detection system 1 is installed, the oxide layer 2d is already rusted. Is formed. By forming such an oxide layer 2d, a galvanic current can flow between the substrate electrode 2a and the pattern electrode 2c. Further, the value of the galvanic current increases as the oxide layer 2d grows.

  The first wiring 2 e is connected to the substrate electrode 2 a and is a wiring that connects the substrate electrode 2 a and the control calculation unit 4 outside the rusted corrosion sensor 2. The second wiring 2 f is a wiring that connects the pattern electrode 2 c and the control calculation unit 4.

  3A and 3B are schematic configuration diagrams of the comparative corrosion sensor 3, wherein FIG. 3A is a plan view and FIG. 3B is a cross-sectional view taken along line BB in FIG.

  As shown in FIG. 3, the comparative corrosion sensor 3 includes a substrate electrode 3a, an insulating film 3b, a pattern electrode 3c, a first wiring 3d, and a second wiring 3e. The substrate electrode 3a is made of a metal material that forms a member to be detected or a material containing the metal material, and is shaped like a plate. Such a substrate electrode 3a is made of, for example, steel (first conductive material).

  The insulating film 3b is an insulating thin film formed on the substrate electrode 3a. In the insulating film 3b, as shown in FIG. 3A, a plurality of slits 3b1 are formed in parallel at the center. Each slit 3b1 is provided through the insulating film 3b as shown in FIG. A part of the surface of the substrate electrode 3a is exposed by these slits 3b1.

  The pattern electrode 3c is formed by patterning on the insulating film 3b, and is formed of a conductive material (second conductive material) different from the material for forming the substrate electrode 3a. For example, gold, silver, copper, aluminum, or an alloy thereof can be used as a material for forming the pattern electrode 3c. Carbon can also be used as a material for forming the pattern electrode 3c. The pattern electrode 3c is provided in the region of the insulating film 3b where the slit 3b1 is formed, and is formed only on the insulating film 3b. That is, in the pattern electrode 3c, a plurality of slits 3c1 are formed in parallel at positions that are aligned with the slits 3b1 of the insulating film 3b. Such a pattern electrode 3c is provided on the substrate electrode 3a via the insulating film 3b, and is insulated from the substrate electrode 3a.

  The first wiring 3 d is connected to the substrate electrode 3 a and is a wiring that conducts between the substrate electrode 3 a and the control calculation unit 4 outside the comparative corrosion sensor 3. The second wiring 3 e is a wiring that connects the pattern electrode 3 c and the control calculation unit 4.

  Based on the signal input from the rusted corrosion sensor 2, the control calculation unit 4 determines the value of the galvanic current flowing between the substrate electrode 2a and the pattern electrode 2c and the difference between the substrate electrode 2a and the pattern electrode 2c. The pressure is obtained as detection data of the rusted corrosion sensor 2. Further, the control calculation unit 4 determines the value of the galvanic current flowing between the substrate electrode 3a and the pattern electrode 3c based on the signal input from the comparative corrosion sensor 3, and the pattern electrode 3c with the substrate electrode 3a. The differential pressure is obtained as detection data of the comparative corrosion sensor 3. Such a control calculation unit 4 detects the corrosion of the metal member X based on the output from the rusted corrosion sensor 2. The recording unit 5 stores the detection data obtained by the control calculation unit 4 under the control of the control calculation unit 4. The communication unit 6 transmits the detection data obtained by the control calculation unit 4 to the outside under the control of the control calculation unit 4.

  FIG. 4 is a flowchart showing the steps including the operation after installation (corrosion detection method) from the installation of the corrosion detection system 1. When the corrosion detection system 1 is installed, a corrosion sensor rusting step (step S1) is first performed as shown in FIG. 1 before the corrosion sensor is installed. In the corrosion sensor rusting step S1, the rusted corrosion sensor 2 is obtained by corroding and rusting the corrosion sensor in which the new oxide layer 2d is not formed. That is, in this embodiment, the corrosion-treated corrosion sensor 2 having the oxide layer 2d is obtained by corroding the substrate electrode of the corrosion sensor before the metal member X is disposed at the detection position for detecting the corrosion state. Make it.

  Then, the arrangement | positioning process (step S2) which arrange | positions the rusted corrosion sensor 2 in the storage container Y (detection position) is performed. Further, a corrosion sensor in which an oxide layer is not formed (the substrate electrode is not corroded) is arranged as a comparative corrosion sensor 3 in the storage container Y (detection position). By performing these corrosion sensor rusting step S1 and placement step S2, the installation of the corrosion detection system 1 is completed.

  Thereafter, under the control of the control calculation unit 4, a recording process (step S3) for recording the detection data of the rusted corrosion sensor 2 and the comparison corrosion sensor 3 with the recording unit 5, and the rusted corrosion sensor 2 and the comparison The transmission process (step S4) in which the detection data of the corrosion sensor 3 is transmitted by the communication unit 6 is repeated. Note that both the recording step S3 and the transmission step S4 are not necessarily required, and a configuration in which only one of them is performed is also possible. For example, when the detection data of the rusted corrosion sensor 2 and the comparative corrosion sensor 3 are output to a display or the like, both the recording step S3 and the transmission step S4 need not be performed.

  In the corrosion detection system 1 installed and operated in this manner, a galvanic current flows in the rusted corrosion sensor 2 from the initial installation state, and the result is output. This galvanic current varies depending on the thickness of the oxide layer 2d. For this reason, the environment in which the metal member X is placed (that is, the environment in the storage container Y) is corroded by the change in the value of the galvanic current output from the rusted corrosion sensor 2. Or whether the metal member X is in an environment to be reduced. In addition, since the galvanic current flows in the rusted corrosion sensor 2 from the initial installation state, if a signal based on the galvanic current is not output from the rusted corrosion sensor 2 in the initial installation state, It can be determined that the rusted corrosion sensor 2 has failed.

  Moreover, since the comparative corrosion sensor 3 does not have an oxide layer in the initial installation state, the corrosion of the metal member X starts, and if the substrate electrode 3a of the comparative corrosion sensor 3 is not oxidized, a galvanic current flows. Absent. For this reason, it can be detected that the corrosion of the metal member X has started based on the output of the comparative corrosion sensor 3.

  According to the corrosion detection method in the present embodiment as described above, there is a step of intentionally corroding the corrosion sensor before installation, and the corrosion sensor (rusted corrosion sensor 2) is used to corrode the corrosion sensor. The corrosion state of the manufactured member X is detected. For this reason, when the galvanic current is not flowing, it can be known that the rusted corrosion sensor 2 has failed. Furthermore, the galvanic current changes according to the progress of corrosion. For this reason, the corrosion state of the metal member X can be estimated based on the change of the galvanic current. Therefore, according to the corrosion detection method of this embodiment, the failure of the rusted corrosion sensor 2 can be identified, and the corrosion state of the metal member X can be accurately detected.

  Further, in the corrosion detection method in the present embodiment, the comparative corrosion sensor 3 in which the substrate electrode 3a is not corroded is arranged in addition to the rusted corrosion sensor 2. For this reason, by using the output result of the comparative corrosion sensor 3, the corrosion state of the metal member X can be detected more accurately than when only the rusted corrosion sensor 2 is used. Furthermore, the corrosion start timing of the metal member X can be accurately known based on the detection start timing of the galvanic current of the comparative corrosion sensor 3.

  Further, in the corrosion detection method in the present embodiment, detection data from the rusted corrosion sensor 2 is recorded in the recording unit 5. For this reason, for example, based on the result stored in the recording unit 5, it is possible to reliably grasp at which timing during transportation the corrosion has occurred in the metal member X after transportation.

  Moreover, in the corrosion detection method in this embodiment, the detection data by the rusted corrosion sensor 2 is transmitted to the outside. For this reason, for example, even when the metal member X is being transported, it is possible to grasp in real time whether or not the metal member X is corroded.

  Moreover, in the corrosion detection method in this embodiment, the rust preventive agent Z is provided side by side with respect to the metal member X inside the storage container Y. For this reason, it becomes possible to suppress that corrosion generate | occur | produces in the metal member X, and that corrosion progresses. Furthermore, the oxide layer formed on the metal member X can be reduced.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the spirit of the present invention.

  For example, in the said embodiment, the structure which installs the corrosion sensor 3 for a comparison in addition to the rusted corrosion sensor 2 was demonstrated. However, the present invention is not limited to this, and it is possible to adopt a configuration in which only the rusted corrosion sensor 2 is installed among the rusted corrosion sensor 2 and the comparative corrosion sensor 3.

  Moreover, in the said embodiment, the structure which uses the new corrosion sensor in which corrosion did not generate | occur | produce as the comparison corrosion sensor 3 was demonstrated. However, the present invention is not limited to this, and a corrosion sensor whose progress of corrosion is smaller than that of the rusted corrosion sensor 2 in the initial state can be used as the comparative corrosion sensor 3. In such a case, although it is difficult to accurately detect the occurrence timing of corrosion of the metal member X, both the detection result of the rusted corrosion sensor 2 and the detection result of the comparative corrosion sensor 3 By using this, it becomes possible to detect a change in the corrosion state more accurately.

1 ... Corrosion detection system 2 ... Rusted corrosion sensor (corrosion sensor)
2a... Substrate electrode 2b... Insulating film 2b1... Slit 2c... Pattern electrode 2c1... Slit 2d. Substrate electrode 3b ... Insulating film 3b1 ... Slit 3c ... Pattern electrode 3c1 ... Slit 3d ... First wiring 3e ... Second wiring 4 ... Control operation section (operation processing section)
5 ... Recording unit 6 ... Communication unit X ... Metal member Y ... Storage container Z ... Rust inhibitor

Claims (7)

The corrosion state of the metal member is detected by a corrosion sensor in which a pattern electrode formed of a second conductive material different from the first conductive material is provided on a substrate electrode formed of the first conductive material via an insulating film. Corrosion detection method
A substrate electrode corrosion step for corroding the substrate electrode before placing the metal member in a detection position for detecting a corrosion state;
And a disposing step of disposing the corrosion sensor in which the substrate electrode is corroded by the substrate electrode corrosive step at the detection position.   The comparative corrosion sensor in which the substrate electrode is not corroded or the progress of the corrosion of the substrate electrode is smaller than that of the corrosion sensor is arranged in addition to the corrosion sensor in the arranging step. The corrosion detection method according to 1.   The corrosion detection method according to claim 1, further comprising a recording step of recording data detected by the corrosion sensor arranged in the arrangement step in a recording unit.   The corrosion detection method according to claim 1, further comprising a transmission step of transmitting detection data from the corrosion sensor arranged in the arrangement step to the outside.   The corrosion detection method according to any one of claims 1 to 4, wherein a rust inhibitor is provided along with the metal member. A corrosion sensor in which a pattern electrode formed of a second conductive material different from the first conductive material is provided on a substrate electrode formed of a first conductive material via an insulating film,
A corrosion sensor, wherein the substrate electrode is in a corrosion state in advance.   A corrosion detection system comprising: the corrosion sensor according to claim 6; and an arithmetic processing unit that detects corrosion of a metal member based on an output from the corrosion sensor.

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