JP2009236524A - Corrosion sensor device, manufacturing method of the corrosion sensor device, corrosion detection method, sensor, and manufacturing method of sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly sensitive corrosion device sensor having a high degree flexibility in design while adopting a conventional idea of detecting a cut thin wire, resolving the problems in the manufacturing process thereof. <P>SOLUTION: The corrosion sensor device 1 for detecting the state of progress of corrosion of a steel material embedded in a concrete structure includes: a conductor pattern part 10a made of an iron foil formed by rolling an iron material; a substrate 10b for holding the conductor pattern part 10a; and a corrosion detection part 2 for measuring the electrical characteristics of the conductor pattern part 10a and detecting a steel material corrosion causes in the concrete structure, based on the measured electric characteristics of the conductor pattern part 10a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for detecting the progress of corrosion of a steel material in a concrete structure.

  Steel materials in concrete structures are protected from corrosion by forming a passive film on the steel material surface because the concrete maintains an alkaline environment. However, for example, when a corrosive factor such as carbon dioxide in the air, sulfuric acid in the sewerage facility, or chloride ions enters the concrete, the passive film is destroyed, and the steel and the steel are corroded by water and oxygen in the concrete. Start.

  When steel in a concrete structure is corroded, the steel expands in volume, and the expansion pressure causes cracks in the concrete.The corrosion of steel is accelerated through the penetration of corrosion factors and the supply of external water and oxygen through the cracks. As it progresses, the function as a concrete structure can no longer be maintained.

  Therefore, before the corrosion of the steel material starts, the intrusion of the corrosion factor and the start of the corrosion of the steel material are detected, and the steel material is protected from corrosion by preventing further invasion of the corrosion factor and water and oxygen by measures such as surface coating, It is important to prevent preventive maintenance of concrete structures. Various corrosion diagnosis methods have been proposed for this problem. For example, a method of analyzing the corrosion factor by removing the core, a method of non-destructively measuring the natural potential and polarization resistance of the steel material, a method of detecting the corrosion factor by a chemical sensor or a gas sensor, a simulated corrosion member using a steel thin wire For example, a method of detecting corrosion when buried in concrete and the fine wire is broken is known.

Among these corrosion diagnosis methods, the method of detecting corrosion by breaking a fine wire is as follows: (1) Do not damage concrete such as core removal by embedding the sensor in advance, (2) Fine wire between the concrete surface and steel material By installing several pipes depending on the depth, it is possible to monitor the time dependency of the invasion of corrosion factors from the surface, making it easy to create a maintenance plan. (3) Corrosion factors because iron corrosion is directly captured It is possible to detect the possibility of corrosion including not only the supply state of water and oxygen, but also (4) because it captures changes in electrical resistance, it can be detected with extremely low power consumption and is suitable for long-term monitoring. Various corrosion diagnosis methods by detecting fine wire cutting have been proposed (for example, Patent Documents 1 to 3).
JP-A-8-0945557 JP-A-8-233896 Japanese Patent No. 3205291

  However, there are problems with the use of thin wires. First, detection sensitivity will be described below. The detection by a thin line is achieved by cutting by corrosion, and it is necessary to cut by slight corrosion. From the viewpoint of detection sensitivity, it is desirable to be as thin as possible. However, iron is difficult to extend compared to other metals, and it is very difficult to produce a wire having a diameter smaller than 0.1 mm. Although it can be made thin by mixing a metal other than iron, there is a problem that it becomes unsuitable as a steel corrosion detection sensor because the properties of the metal change. Moreover, corrosion occurs stochastically and does not occur uniformly, and it is theoretically necessary to form a corrosion cell in the corrosion portion. Therefore, if the length of the thin wire is short, even if the environment in the concrete becomes a corrosive environment, the fine wire may not necessarily be corrosive and cut, and the thin wire has an appropriate length depending on the cross-sectional area and surface area of the thin wire. Otherwise, the corrosion rate becomes slow, and as a result, the corrosion detection sensitivity is lowered.

  Moreover, the iron fine wire has a problem that it is not easy to handle. It takes time and labor to solder a thin wire to a circuit, and it breaks easily. This makes mass production difficult and not industrially desirable, but is difficult to use except in a straight state. For example, if the length of the fine line is increased to improve the sensitivity, it will not be easy to install in the concrete, and it has been considered to change the arrangement of the fine line, but it is difficult to process the fine line. Is difficult. On the other hand, the fine wires installed in the concrete may be physically damaged by concrete aggregates or the like when the concrete is placed. In order to solve this problem, it is necessary to dig a groove in a mortar that has been hardened in advance, wind a fine wire along the groove, and install it in the concrete as a sensor. Arrangement becomes complicated.

  On the other hand, in order to solve the problem of thin wires with low workability, a method of performing iron plating has also been proposed. This is a method for producing a sensor unit by etching a sheet of aluminum to form a pattern and performing iron plating thereon. Although aluminum is embedded in concrete with iron plated, aluminum can be readily dissolved in an alkaline environment, so an iron sensor can be realized. Further, a complicated conductor pattern can be formed by etching, mass production is possible, and since it is plating, the thickness of iron can be controlled.

  As described above, the technique using iron plating improves the sensitivity as a sensor and has a high degree of freedom in design, but it has been found that there are problems in actual experiments. That is, it is difficult to uniformly plate iron on aluminum. Etching may cause side etching where the edge of the aluminum pattern of the base material does not become perpendicular to the substrate, resulting in a side etching that is not sufficiently iron-plated, and the aluminum base material is exposed. May end up. Moreover, pinholes may be generated by plating. In these cases, aluminum melts in the concrete without depending on the corrosion factor, and the iron plating is broken when the aluminum melts, resulting in disconnection. This has been confirmed when the thickness of the iron plating is about 20 μm. Thus, it was confirmed that there was a manufacturing problem that it did not function as a sensor because iron plating was not successful.

  The present invention has been made in view of such circumstances, and while following the concept of detecting the cutting of a thin wire, the present invention solves manufacturing problems, has high sensitivity, and has a high degree of design freedom. An object of the present invention is to provide a method for manufacturing a corrosion sensor device, a method for detecting corrosion, a sensor, and a method for manufacturing the sensor.

  (1) In order to achieve the above object, the present invention takes the following measures. That is, the corrosion sensor device of the present invention is a corrosion sensor device for detecting the progress of corrosion of steel in a concrete structure, and a conductor pattern portion formed of an iron foil material produced by rolling iron, A substrate that holds the conductor pattern portion, and a corrosion detector that measures electrical characteristics of the conductor pattern portion and detects a corrosion factor of steel in a concrete structure based on the measured electrical characteristics of the conductor pattern portion. It is characterized by providing these.

  Thus, since a conductor pattern part is formed with the iron foil material produced by rolling iron, the freedom degree of design becomes higher than the case where the conventional fine wire is used, and manufacture becomes easy. As a result, a complicated shape can be easily configured. Further, since the thickness of the iron foil material is very thin, it is possible to shorten the time until the wire breaks rather than the thin wire, and as a result, the sensitivity as a sensor is increased and the conductor pattern portion is held by the substrate. Therefore, it is possible to ensure the strength when placing concrete.

  (2) Further, in the corrosion sensor device of the present invention, the conductor pattern portion has a thickness of less than 0.1 mm from the substrate, and a two-dimensional uneven or spiral circuit on the substrate. It is characterized by comprising.

  As described above, since the thickness of the conductor pattern portion from the substrate is less than 0.1 mm, it is possible to shorten the time until disconnection rather than the thin wire, and as a result, it is possible to increase the sensitivity as a sensor. Become. In addition, since a two-dimensional uneven or spiral circuit is formed on the substrate, the entire sensor can be made as small as possible and the area of the conductor pattern portion can be increased. As a result, the sensor's sensitivity is improved by increasing the probability of contact with the corrosion factor, and the downsizing enables the installation between the concrete surface and the steel material, which detects the corrosion factor before it reaches the steel material. Is possible. The lines need to be long because corrosion occurs stochastically, and forming a two-dimensional rugged or spiral circuit on the substrate has the same effect as extending the length of the line, but with less space. It is feasible.

  (3) Moreover, the manufacturing method of the corrosion sensor apparatus of this invention is a manufacturing method of the corrosion sensor apparatus which detects the steel-material corrosion factor embed | buried in a concrete structure, Comprising: Iron foil produced by rolling iron Forming an iron foil sheet by integrating a material and a substrate, forming a resist film having a concavo-convex or spiral circuit pattern on the iron foil of the iron foil sheet, and forming the resist film The step of etching the iron foil sheet, the step of removing the resist film of the iron foil sheet after the etching, the step of connecting a conductor to the circuit pattern of the iron foil sheet, the conductor, and the circuit pattern Connecting at least a corrosion detecting unit for measuring the electrical characteristics and detecting the corrosion of the circuit pattern unit.

  In this way, the iron foil material and the substrate are integrated to produce an iron foil sheet, and a resist film having a concavo-convex or spiral circuit pattern is formed on the iron foil of the iron foil sheet and etched. A two-dimensionally complicated pattern can be formed. Thereby, while making the whole sensor as small as possible, the area of a conductor pattern part can be enlarged. As a result, it is possible to increase the probability of contacting the corrosion factor and improve the sensitivity of the sensor. In addition, since the circuit portion as well as the conductor pattern portion can be formed simultaneously by etching, the manufacturing process can be simplified.

  (4) Moreover, the corrosion detection method of this invention embeds the corrosion sensor apparatus in any one of the above in a concrete structure, measures the electrical property of the said conductor pattern part, The said conductor pattern part measured It is characterized by detecting steel corrosion factors in concrete structures based on the electrical characteristics.

  Thus, since a conductor pattern part is formed with an iron foil material, thickness can be made very thin and time until it breaks rather than a thin wire can be shortened. As a result, not only the sensitivity as a sensor can be increased, but also detection with low power consumption is possible. Furthermore, since the formed conductor pattern part is flat compared to the fine wire, it can be protected with a protective film after manufacturing with glued plastic film, etc., and the fine wire will corrode before installation on concrete On the other hand, it can be transported or installed in a concrete mold without being corroded until installation, and quality can be easily ensured by removing the protective film before placing. In addition, it is difficult to use a protective film because the mechanical strength of aluminum as a base material is insufficient even in the iron plating method.

  (5) Moreover, the sensor of this invention is a sensor used for the corrosion sensor apparatus which detects the corrosion progress state of the steel materials in a concrete structure, Comprising: It formed with the iron foil material produced by rolling iron A conductor pattern portion and a substrate holding the conductor pattern portion are provided, and the electrical characteristics of the conductor pattern portion are changed by a steel material corrosion factor in a concrete structure.

  Thus, since a conductor pattern part is formed with the iron foil material produced by rolling iron, the freedom degree of design becomes higher than the case where the conventional fine wire is used, and manufacture becomes easy. As a result, a complicated shape can be easily configured. In addition, since the thickness of the iron foil material is very thin, it is possible to shorten the time until the wire breaks rather than the thin wire, and as a result, the sensitivity as a sensor is increased and the pattern portion is retained during concrete placement. It is possible to ensure the strength of the.

  (6) Moreover, the manufacturing method of the sensor of this invention is a manufacturing method of the sensor used for the corrosion sensor apparatus which detects the steel material corrosion factor embed | buried in a concrete structure, Comprising: It produced by rolling iron A step of producing an iron foil sheet by integrating an iron foil material and a substrate, a step of forming a concavo-convex or spiral circuit pattern resist film on the iron foil of the iron foil sheet, and the resist film At least a step of etching the iron foil sheet on which is formed, and a step of removing the resist film of the iron foil sheet after the etching.

  In this way, the iron foil material and the substrate are integrated to produce an iron foil sheet, and a resist film having a concavo-convex or spiral circuit pattern is formed on the iron foil of the iron foil sheet and etched. A two-dimensionally complicated pattern can be formed. Thereby, while making the whole sensor as small as possible, the area of a conductor pattern part can be enlarged. As a result, it is possible to increase the probability of contacting the corrosion factor and improve the sensitivity of the sensor.

  According to the present invention, since the conductor pattern portion is formed of the iron foil material, the thickness can be made very thin, and the time until disconnection can be shortened rather than the thin wire. As a result, it is possible to increase the sensitivity as a sensor.

  Next, embodiments according to the present invention will be described with reference to the drawings. The present inventor has paid attention to iron foil materials used for special applications such as some magnetic thin films and magnetic devices, and found that this is used for diagnosing corrosion of steel materials in concrete structures. I came to do. Since the iron foil material is electrolyzed to pure iron and then rolled, the iron can be made very thin. If it is this iron foil material, a resist can be printed and etched. Therefore, by using the iron foil material, it is possible to configure a small and complicated sensor that cannot be achieved by thin wires or iron plating. In the present specification, the difference between the iron foil material and the fine wire is defined as follows. That is, a thin wire is produced by applying tension to iron and pulling it, whereas an iron foil material is produced by rolling iron. As a result, the thin wire has a diameter of 0.1 mm or more even at the finest, while the iron foil material has a thickness of less than 0.1 mm.

  A more preferable thickness of the iron foil material as a sensor for detecting the progress of corrosion of the steel material in the concrete structure is 3 μm or more and less than 0.1 mm. When the thickness of the iron foil is 0.1 mm or more, it takes time for etching, and during this time, the iron is oxidized to cause expansion and damage the resist film, and a uniform line width may not be secured. is there. On the other hand, the thickness of the iron foil material is preferably 3 μm or more. If the thickness is less than 3 μm, the physical strength may be insufficient at the time of placing the concrete, resulting in disconnection. Considering the physical strength and the sensitivity of corrosion detection, it is more preferably 5 μm or more and 25 μm or less.

  In addition, regarding the line width of the iron foil, if the line width is less than 0.1 mm, disconnection may occur during etching. On the other hand, the adhesion with the base material is weak, and manufacturing or placing concrete Prone to damage. From the viewpoint of etching, concrete placement, installation, and protection by film, 0.1 mm or more is desirable, and when the line width is thick, the sensitivity due to corrosion cutting decreases, so the line width may be 2.0 mm or less. preferable.

  FIG. 1 is a diagram showing a schematic configuration of a corrosion sensor device according to the present embodiment. In this corrosion sensor device 1, a conductor pattern portion 10 a formed of an iron foil material is held on a substrate 10 b, and the conductor pattern portion 10 a is electrically connected to the corrosion detection portion 2. Since the conductor pattern portion 10a is formed of an iron foil material, the thickness is less than 0.1 mm. The conductor pattern portion 10a and the substrate 10b constitute a sensor.

  In FIG. 1, the conductor pattern portion 10a can take a two-dimensionally complicated shape. For example, FIG. 2A is a diagram showing a two-dimensional uneven conductor pattern portion 10a, and FIG. 2B is a diagram showing a two-dimensional spiral conductor pattern. As described above, since the iron foil material is used, it is possible to configure the conductor pattern portion 10a having a complicated shape that is impossible with a thin wire.

  Formation of a two-dimensional concavo-convex or spiral circuit on a substrate enables the line length to be realized in a space-saving manner. As for the length of the wire, about 10% of the sensors that do not cut the salt-containing concrete were found when the length of the wire was 5 to 25 μm and the wire width was 1.0 mm and the wire length was 20 mm. All the wires were disconnected by setting the length to 50 mm or more. The length of the wire depends on the thickness of the iron foil to be used, the wire width, and the installable space, but the wire length is preferably 50 mm or more. On the other hand, if the line length exceeds 1000 mm, the area of the pattern portion becomes large, which is not preferable for embedding in the structure. In this embodiment, for example, the thickness of the iron foil is 20 μm, the line width of the conductor pattern portion is 1.0 mm, and the total line length is 250 mm.

  Connect the lead wire to the above sensor, embed it in the concrete structure, pull out the other lead wire connected to the sensor to the outside of the concrete structure, and connect it to the corrosion detection unit consisting of the interface circuit and detection circuit Thus, the corrosion sensor device can be configured. With this corrosion detection unit, it is possible to detect a disconnection by grasping the electrical characteristics of the sensor unit connected to the lead wire. However, as shown in FIG. 1, it is more preferable that the corrosion detection unit is constituted by a wireless module and the entire corrosion sensor device is embedded in a concrete structure. By configuring the wireless module, the lead wire connected to the sensor can be transmitted to eliminate the possibility that a corrosion factor enters the concrete, and the lead wire itself can be prevented from being deteriorated by corrosion. Furthermore, by embedding the corrosion sensor device itself in the concrete, it has an effect of preventing deterioration due to the corrosion factor of the corrosion detection part. Since corrosion sensor devices are often used to detect concrete in corrosive environments, it is necessary to configure the corrosion sensor device with a wireless module and embed it in a concrete structure from the viewpoint of ensuring the durability of the device itself. And the effect is great.

  The interface circuit 12 shown in FIG. 1 is a circuit that connects the conductor pattern portion 10a and the wireless module 13, and the electrical characteristics of the derived pattern 10a such as voltage (potential difference), electrical resistance, impedance, capacitance, etc. A value or the like is passed to the wireless module as an output value. For example, a resistance value that is an electrical characteristic of the derived pattern 10a is obtained by applying a constant voltage, and a value corresponding to the resistance value is output as a voltage value. It is possible to detect disconnection at a ratio of The wireless module 13 transmits detection information to the outside by wireless transmission / reception such as a specific small-sized low-power wireless, RFID, and wireless LAN, and includes a detection circuit 13a and a wireless communication circuit 13b. The detection circuit 13a reads a signal from the interface circuit 12, and corresponds to an analog / digital conversion circuit or the like. In the present embodiment, the voltage of the conductor pattern portion 10a is detected. The wireless communication circuit 13b wirelessly transmits the detection result of the detection circuit 13a to the external reading device via the antenna 14. Here, the interface circuit 12, the wireless module 13, and the antenna 14 constitute a corrosion detection unit.

  In FIG. 1, the wireless communication circuit 13b of the wireless module 13 includes a modulation circuit, a charging / power supply unit, a memory, and the like. This power supply unit may be of a type equipped with a battery, or may be of a so-called battery-less type, that is, having a power storage function and temporarily storing an induced voltage due to electromagnetic waves supplied from the outside. good. The memory included in the wireless communication circuit 13b includes an operating system that performs overall control, a program that detects the state of the structure, and a ROM and RAM that are used to record the detected information. An ID number of the sensor may be mounted in the memory, or information related to the embedded position of the structure may be written in the RAM from the reading device, and the information may be read by the reading device together with the information detected by the sensor.

  The antenna 14 in FIG. 1 is made of metal, carbon fiber, ferrite, or the like, and is preferably a hollow winding, a magnetic winding, or a substrate formed by using a printing technique. These materials may be used by being sandwiched between films such as PET, and the shape thereof may be used after being molded into an appropriate shape such as a ring shape, a rod shape, or a disk shape.

Further, for example, if the conductor pattern portion 10a is provided on a surface substantially orthogonal to the direction in which the corrosion factor advances, the probability of capturing the corrosion factor can be increased. Further, a plurality of conductor pattern portions 10a are provided in parallel to the depth direction. As a result, it is possible to capture the corrosion factor penetrating into the concrete over time, thereby accurately predicting the period until the corrosion factor reaches the steel material based on the theory of diffusion. This is useful information for the maintenance of structures. For example, if the corrosion factor penetrates from the concrete surface to the inside by diffusion, the distance from the concrete surface to the conductor pattern portion 10a is A, the distance from the concrete surface to the steel material is B, and the corrosion sensor device corrodes from the construction of the concrete structure. If the time at which the factor is detected is TA, the time TB from the construction of the concrete structure to the corrosion of the steel material can be predicted as TB = TA · (B ² / A ² ), which is detected by the corrosion sensor device. Based on the information, it is possible to take measures to protect the concrete structure from deterioration before deterioration occurs.

  The inventor manufactured a sensor using an iron foil material and conducted an experiment on the detection probability. FIG. 3 is a diagram illustrating an experiment of the corrosion sensor device according to the present embodiment. As described above, the sensor (conductor pattern portion) has a two-dimensional uneven shape or spiral shape. This is to make it easier to detect corrosion factors that have entered from the outside of the concrete. In the present embodiment, the substrate 10b is 40 mm wide and 50 mm long. However, the present invention is not limited to this. For example, the width can be set to 20 mm to 100 mm, and the length can be set to 20 mm to 100 mm. In FIG. 3, when the corrosion factor is chloride ion, the exposed surface is defined as the chloride ion intrusion direction. The exposed surface was not coated, and the other five surfaces were coated with resin. Moreover, the installation position of the sensor performed the case where the depth from an exposed surface is 15 mm, and the case of 35 mm. This specimen was immersed in a 15% aqueous sodium chloride solution and subjected to a salt penetration test into concrete. And the resistance change by corrosion of the iron foil of a conductor pattern part was detected by the chloride ion which is a corrosion factor.

  FIG. 4 is a diagram showing experimental results. As shown in FIG. 4, a resistance change due to disconnection was detected from a sensor installed at a position of 15 mm near the immersion surface (exposed surface) of salt. As a result, it was clearly understood that the corrosion factor had permeated. Thereafter, a resistance change due to disconnection was also detected from a sensor installed at a position 35 mm from the immersion surface (exposed surface) of salt. As a result, when the sensor (conductor pattern part) is made of iron foil material, the sensitivity is high, the time difference in disconnection is small compared to other types, the degree of design freedom is large, and the manufacturing difficulty is low. I was able to confirm.

  Next, a method for manufacturing the corrosion sensor device according to this embodiment will be described. FIG. 5 is a flowchart showing a procedure of a method for producing a conductor pattern portion according to the present embodiment. First, the iron foil material and the base material are integrated to produce an iron foil sheet (step S1). Here, an adhesive is applied to a resin film (for example, a resin film such as PET or polyimide material) serving as a base material, and the iron foil material and the base material are bonded together using a roller or the like. Thereby, an iron foil sheet is produced.

  Next, a resist film having a conductor pattern is formed on the iron foil of the iron foil sheet produced in step S1 (step S2). That is, a resist film in the shape of a sensor (conductor pattern portion) and a circuit is formed on the iron foil of the iron foil sheet by screen printing or photo printing. At the same time, a guide or the like for individually cutting and separating the sensor by a punching die after completion is printed.

  Next, etching is performed (step S3). Here, the resist-printed iron foil sheet is etched in an etching tank. As a result, the exposed iron foil not provided with the resist film is dissolved by the etching solution (for example, ferric chloride solution). After completion of the etching, the iron foil sheet is taken out from the etching tank and the adhering liquid is washed. Thereafter, the resist film is removed with a solvent or the like, and the conductor pattern portion and the outer shape of the circuit are completed.

  Next, division after molding is performed (step S4). In the sensor (conductor pattern portion) formed integrally with the circuit for connection, water-resistant paint is printed and a protective film is applied to waterproof and protect other circuits. Thereafter, the sensors subjected to the protection process are individually cut and separated using a punching die. Here, since the resin sheet has low heat resistance, it is difficult to use solder. For this reason, you may form a connection part using a fitting terminal. The terminal is provided by caulking the connection ground portion of the circuit using a fitting terminal. And it connects with a corrosion detection part with a connector lead wire.

  As described above, according to this embodiment, since the thickness of the conductor pattern portion from the substrate is less than 0.1 mm, it is possible to shorten the time until the wire breaks rather than the thin wire, and as a result, the sensor It is possible to increase the sensitivity. In addition, since a two-dimensional uneven or spiral circuit is formed on the substrate, the entire sensor can be made as small as possible and the area of the conductor pattern portion can be increased. As a result, it is possible to increase the probability of contacting the corrosion factor and improve the sensitivity of the sensor.

It is a figure which shows schematic structure of the corrosion sensor apparatus which concerns on this embodiment. (A) is a figure which shows the conductor pattern part of a two-dimensional uneven | corrugated shape, (b) is a figure which shows the conductor pattern part of a two-dimensional spiral shape. It is a figure which shows the mode of experiment of the corrosion sensor apparatus which concerns on this embodiment. It is a figure which shows an experimental result. It is a flowchart which shows the procedure of the preparation methods of the conductor pattern part which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Corrosion sensor apparatus 2 Corrosion detection part 10a Conductor pattern part 10b Board | substrate 12 Interface circuit 13 Wireless module 13a Detection circuit 13b Wireless communication circuit 14 Antenna

Claims (6)

A corrosion sensor device for detecting the progress of corrosion of steel in a concrete structure,
A conductor pattern portion formed of an iron foil material produced by rolling iron;
A substrate for holding the conductor pattern portion;
Corrosion characterized by comprising: a corrosion detector that measures electrical characteristics of the conductor pattern portion and detects a corrosion factor of a steel material in a concrete structure based on the measured electrical characteristics of the conductor pattern portion. Sensor device.   The thickness of the said conductor pattern part is less than 0.1 mm, and comprises the circuit of a two-dimensional uneven | corrugated shape or a spiral shape on the said board | substrate. Corrosion sensor device. A method for manufacturing a corrosion sensor device for detecting a corrosion factor of a steel material embedded in a concrete structure,
A process for producing an iron foil sheet by integrating an iron foil material and a substrate produced by rolling iron; and
On the iron foil of the iron foil sheet, forming a concavo-convex or spiral circuit pattern resist film,
Etching the iron foil sheet on which the resist film is formed;
Removing the resist film of the iron foil sheet after the etching;
Connecting a conductive wire to the circuit pattern of the iron foil sheet;
A method of manufacturing a corrosion sensor device, comprising at least a step of connecting the conductive wire and a corrosion detection unit that measures the electrical characteristics of the circuit pattern and detects corrosion of the circuit pattern unit.   The corrosion sensor device according to claim 1 or 2 is embedded in a concrete structure, the electrical characteristics of the conductor pattern portion are measured, and the concrete structure is measured based on the measured electrical characteristics of the conductor pattern portion. A corrosion detection method characterized by detecting a steel corrosion factor in an object. A sensor used in a corrosion sensor device for detecting the progress of corrosion of steel in a concrete structure,
A conductor pattern portion formed of an iron foil material produced by rolling iron;
A substrate for holding the conductor pattern portion,
A sensor, wherein the electrical characteristics of the conductor pattern portion are changed by a steel material corrosion factor in a concrete structure. A method for manufacturing a sensor used in a corrosion sensor device for detecting a steel corrosion factor embedded in a concrete structure,
A process for producing an iron foil sheet by integrating an iron foil material and a substrate produced by rolling iron; and
On the iron foil of the iron foil sheet, forming a concavo-convex or spiral circuit pattern resist film,
Etching the iron foil sheet on which the resist film is formed;
And a step of removing the resist film of the iron foil sheet after the etching.

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