Paint deterioration diagnosis method, paint deterioration diagnosis device, and program

Abstract

To provide a coating deterioration diagnostic method, coating deterioration diagnostic device and program, which enable quantitative estimation of the coating deterioration state including coating deterioration state of a structure and the corrosion state of a coating base material.SOLUTION: A coating deterioration diagnostic method is provided, comprising: preparing a test piece having a test coating film formed thereon, using a coating material used to form a coating film on a surface of a structure, to cover a surface of an electrode unit made of a conducive material and provided on a member; exposing the test piece to a predetermined observation environment; detecting electrical properties obtained from the electrode unit; and determining the degree of coating deterioration including the deterioration state of the coating film and the corrosion state of a coating base material in contact with the coating film.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a coating deterioration diagnosis method, a coating deterioration diagnosis device, and a program for predicting the service life of a coated surface. [Background Art]

[0002] Metal structures such as steel towers are coated to cover the surfaces of members with a coating film for corrosion prevention. Coating applied to the surface of a metal member deteriorates over time, which may cause corrosion of the metal member. Therefore, the coated surface of a metal structure is regularly inspected, and repairs such as repainting are performed according to the state of deterioration (see, for example, Patent Document 1). In general, the service life of a coating applied to a structure is evaluated based on a decrease in gloss and the loss and wear of the coating film according to the purpose of the coating.

[0003] In coating inspection, a worker compares a limit sample or the like with the coated surface, determines whether corrosion has occurred under the coating film based on experience and knowledge, and determines the timing of repainting. At this time, if the coated surface has not reached the repainting timing, continuous inspection is performed. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Publication No. 2020-124664 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] In the case of actual coating for the purpose of rust prevention, whether to perform repainting is determined by judging the expansion degree of the area of corrosion occurring under the coating film. In order to evaluate the coating service life based on the occurrence of under-film corrosion, a coating test piece may be exposed outdoors to perform service life evaluation. However, a method for quantitatively measuring the deterioration state of a coating including the corrosion state of a coating base has not yet been proposed.

[0006] The present invention aims to provide a paint deterioration diagnosis method, a paint deterioration diagnosis device, and a program that can quantitatively estimate the deterioration state of paint, including the deterioration state of the paint film on a structure and the corrosion state of the paint substrate. [Means for solving the problem]

[0007] One aspect of the present invention involves creating a test piece in which a test coating is formed using a paint used for coatings formed on the surface of a structure, covering the surface of an electrode portion provided on a member with a conductive material, exposing the test piece to a predetermined observation environment, detecting the electrical properties obtained from the electrode portion, and determining the degree of paint deterioration, including the deterioration state of the coating and the corrosion state of the painted substrate in contact with the coating, based on the detected values ​​of the electrical properties. This is a method for diagnosing paint deterioration.

[0008] According to the present invention, by detecting the electrical characteristics of the electrodes of a test piece, it is possible to quantitatively estimate the state of paint deterioration, including the state of deterioration of the coating film on a structure and the state of corrosion of the substrate being painted.

[0009] The member of the present invention is formed of a first metal, and the electrode portion comprises an electrode formed of a second metal different from the first metal and an insulating layer that insulates the electrode from the member, and the electrical characteristics may be determined by detecting the current value generated between the electrode and the member.

[0010] According to the present invention, by detecting the galvanic current generated between the electrode and the material, the degree of paint deterioration can be quantitatively evaluated without using a power source.

[0011] In this invention, the test specimen may be placed at an observation point where the structure is installed, and the test specimen may be exposed to the observation environment at the observation point.

[0012] According to the present invention, the degree of paint deterioration of a structure can be accurately evaluated by exposing a test specimen to the same environment as the structure.

[0013] The present invention may also involve placing the test specimen in a test apparatus capable of generating a simulated environment that mimics the observation environment at an observation point where the structure is installed, generating the simulated environment with the test apparatus, and exposing the test specimen to the simulated environment.

[0014] According to the present invention, by generating a simulated environment using a test device, the degree of deterioration of a test specimen can be observed in an environment similar to that of a structure.

[0015] The electrode of the present invention may be processed in advance to a predetermined state of deterioration, and the test piece on which the test coating film is formed may be created.

[0016] According to the present invention, by processing the electrodes to a predetermined state of degradation in advance, the electrical characteristics of the test piece according to the degree of degradation can be observed, and the detected values ​​can be stored in a database.

[0017] One aspect of the present invention is a paint deterioration diagnostic device comprising: a detection unit for detecting electrical characteristics obtained from an electrode portion of a test piece, which comprises an electrode portion provided on a member using a conductive material and a coating film formed to cover the electrode portion using a paint used for coating films formed on the surface of a structure; and a calculation unit for determining the degree of paint deterioration, including the deterioration state of the coating film and the corrosion state of the painted substrate in contact with the coating film, based on the detected value of the electrical characteristics.

[0018] According to the present invention, a paint deterioration diagnostic device can be configured to quantitatively estimate the deterioration state of the paint, including the deterioration state of the paint film on a structure and the corrosion state of the paint substrate, by detecting the electrical characteristics of the electrodes of a test piece.

[0019] The present invention is a program that causes a computer mounted on a coating deterioration diagnosis apparatus for managing a painted surface of a structure to detect electrical characteristics obtained from the electrode part of a test piece, wherein the test piece includes: an electrode part provided on a member using a conductive material; and a coating film formed to cover the electrode part using a coating material for a coating film formed on a surface of the structure, and that causes the computer to determine a degree of coating deterioration including a deterioration state of the coating film and a corrosion state of a coating base in contact with the coating film based on a detected value of the electrical characteristics.

[0020] According to the present invention, a program for operating a coating deterioration diagnosis apparatus that quantitatively estimates a coating deterioration state including a deterioration state of a coating film of a structure and a corrosion state of a coating base by detecting electrical characteristics of an electrode of a test piece can be configured.

Effects of the Invention

[0021] According to the present invention, a coating deterioration state including a deterioration state of a coating film of a structure and a corrosion state of a coating base can be quantitatively estimated.

Brief Description of Drawings

[0022] [Figure 1] It is a cross-sectional view showing the configuration of a test piece. [Figure 2] It is a plan view showing the configuration of an electrode provided on a test piece. [Figure 3] It is a cross-sectional view showing the configuration of a test piece with progressed deterioration. [Figure 4] It is a cross-sectional view showing a state where moisture permeates into a test piece with progressed deterioration. [Figure 5] It is a diagram showing predicted values of current values detected by a detection unit. [Figure 6] It is a diagram showing electrical characteristics of test pieces formed under different conditions. [Figure 7] It is a diagram showing the configuration of a coating deterioration diagnosis system. [Figure 8] It is a flowchart showing a processing flow of a coating deterioration diagnosis method.

Mode for Carrying Out the Invention

[0023] The embodiments of the paint deterioration diagnosis method, paint deterioration diagnosis apparatus, and program of the present invention will be described below with reference to the drawings. The paint deterioration diagnosis method is performed using a test piece for testing paint deterioration.

[0024] As shown in Figure 1, the test specimen S comprises a member S1 formed in the shape of a plate from a metallic material, an electrode portion S2 provided on the surface of member S1, and a test coating film S10 formed to cover the surface of the electrode portion S2. Member S1 is made of the same material as the structure, such as a steel tower, that is under management. Member S1 is made of, for example, a steel plate made of iron. The material of member S1 may be appropriately changed depending on the structure under management. A plating layer may be formed on the surface of member S1. The electrode portion S2 is provided on one side of member S1.

[0025] The electrode section S2 includes, for example, an electrode S3 formed of a conductive material and an insulating layer S4 that insulates the electrode S3 from the member S1. The electrode S3 is formed of a metal material (second metal) with a lower ionization tendency than the metal material (first metal) forming the member S1. That is, the electrode S3 is formed of a material that allows a galvanic current (corrosion current) to flow when it is in electrical contact with the member S1. The surfaces of the member S1, the insulating layer S4, and the electrode S3 are designated as a test coating substrate S11. The layer including the test coating film S10 and the test coating substrate S11 is called the test coating. The test coating substrate S11 is a reproduction of the coating substrate in contact with the coating film. In this embodiment, the electrode S3 is made of silver. The electrode S3 is formed so that a current flows based on the potential difference when an electrolyte such as water is mediated between it and the member S1. In this embodiment, the electrode S3 is on the cathode side with respect to the member S1, and corrosion occurs on the member S1 side.

[0026] As shown in Figure 2, the electrode S3 has a slit portion ST formed therein, which has multiple slit holes SH. The slit holes SH are formed as elongated holes. Multiple slit holes SH are arranged in the slit portion ST. The insulating layer S4 is made of a non-conductive material such as epoxy resin. Multiple through holes S4H are formed in the insulating layer S4, corresponding to the multiple slit holes SH and penetrating to the member S1. A detection unit C for detecting the electrical characteristics obtained from the electrode S3 is electrically connected to the electrode S3 and the member S1. The detection unit C is, for example, a non-resistive ammeter. The detection unit C detects the current flowing between the electrode S3 and the member S1. The electrode portion S2 is covered with a test coating film S10.

[0027] The test coating S10 is formed using paint used for coatings formed on the surface of a structure. The test coating S10 is, for example, an epoxy resin-based paint. The test coating S10 may be appropriately changed depending on the structure being managed. The test coating S10 may be formed of two or more layers. The test coating S10 may be formed of multiple layers using the same paint, or it may be formed of multiple layers using different paints. The test coating S10 formed of multiple layers may include a rust-preventive coating and a primer coating. The test specimen S is exposed in a predetermined observation environment. The test specimen S is, for example, placed at an observation point where the structure is installed. After the test specimen S is placed at the observation point for a predetermined period, the deterioration of the test coating S10 and the corrosion state of the test coating substrate S11 are observed. The test specimen S may be placed in a test apparatus (not shown) capable of generating a simulated environment that mimics the observation environment at the observation point where the structure is installed, and the deterioration of the test coating S10 and the corrosion state of the test coating substrate S11 may be observed using the test apparatus. The test apparatus allows for the simulation environment to be altered to accelerate the deterioration of the test specimen S. The test apparatus allows for the observation of the deterioration of the test specimen S in a shorter period of time compared to exposure at the observation point.

[0028] As shown in Figure 3, when the test specimen S is exposed to the test coating S10 for a predetermined period of time at an observation point or within a test apparatus, the test coating S10 deteriorates. When the test coating S10 deteriorates, the thickness of the coating decreases, pinholes P penetrate from the coating surface to the component S1, and the test coating S10 separates from the component S1 or electrode S3, creating a gap Q in the layer beneath the test coating S10.

[0029] As shown in Figure 4, water penetrates pinholes P and gaps Q during rainfall, etc. This causes a current to flow in the lower layer of the test coating S10 based on the potential difference between electrode S3 and member S1, resulting in corrosion of the test coating substrate S11, including member S1. Detection unit C detects the current flowing between electrode S3 and member S1. The detected value from detection unit C is observed periodically.

[0030] As shown in Figure 5, the current value detected by the detection unit C is expected to increase when the test piece S is exposed to water over a predetermined period. Furthermore, the current value is expected to increase as the deterioration of the test piece S progresses. In other words, the current value is expected to tend to increase as the test coating film S10 deteriorates. The current value is expected to tend to increase as the corrosion of the test coating substrate S11 beneath the test coating film S10 progresses. The current value is expected to tend to increase as water penetrates beneath the test coating film S10. The degree of deterioration of the test coating substrate S11 beneath the test coating film S10 is expected to differ not only due to moisture but also due to differences in the amount of ultraviolet light and salt content at the observation point. To confirm the above predictions and to reproduce the state of the structure, multiple test pieces S formed with different underlying layer conditions were prepared. In addition, the current value of the test piece S was observed while varying the ultraviolet light irradiation time.

[0031] As shown in Figure 6, the current values ​​of multiple test specimens S formed under various conditions were observed. In the observation, a chloride compound was applied to the surface of member S1 before painting to form a test coating film S10, and a first test specimen was formed by irradiating it with ultraviolet light from a light source that generates strong ultraviolet light for a first irradiation time (325 hours). The light source was, for example, a metal hide lamp that generates ultraviolet light more than 10 times that of sunlight. With this light source, it is possible to irradiate with ultraviolet energy equivalent to one year's worth of outdoor exposure in just a few days, thus shortening the observation period.

[0032] Furthermore, in the observation, a second test specimen was formed by inducing corrosion between member S1 and electrode S3 before painting to form a test coating film S10, and then irradiating it with ultraviolet light from a light source that generates strong ultraviolet light for a first irradiation time. That is, the second test specimen was formed in a state where corrosion had already occurred on the test coating substrate S11, and the test coating film S10 was already deteriorated compared to the first test specimen. Furthermore, in the observation, a third test specimen was formed by inducing corrosion between member S1 and electrode S3 beforehand to form a test coating film S10, and then irradiating it with ultraviolet light from a light source that generates strong ultraviolet light for a second irradiation time (650 hours). That is, the third test specimen was formed in a state where corrosion had already occurred on the test coating substrate S11, and the test coating film S10 was already deteriorated compared to the second test specimen.

[0033] As shown in the figure, the current value of the first test specimen changes depending on whether the test coating S10 is dry or wet (comparative example: Figure 5). Furthermore, when comparing the first and second test specimens with the same UV irradiation time, it can be seen that the current value of the second test specimen, in which the test coating substrate S11 is already corroded, increases compared to the first test specimen. Also, when comparing the second and third test specimens, in which the test coating substrate is already corroded but the UV irradiation time to the coating film differs, it can be seen that the current value of the third test specimen increases compared to the second test specimen. This shows that the current value of a painted structure tends to increase as corrosion occurs in the coating substrate, and as the deterioration of the coating film progresses. Based on the experimental results, a database is created showing the relationship between parameters indicating environmental conditions such as the amount of UV radiation, precipitation, and salinity at the location where the structure is installed, and the current value. Then, by monitoring the electrical characteristics detected from the test specimen S installed under the environmental conditions at the location of the structure, it is possible to quantitatively evaluate the deterioration occurring in the coating of the structure.

[0034] As shown in Figure 7, a paint deterioration diagnosis system 1 can be constructed to determine the degree of paint deterioration, including the deterioration of the paint film on a structure and the corrosion state of the paint substrate, thereby enabling management of the paint condition of a structure. The paint deterioration diagnosis system 1 is composed of, for example, a predetermined number of detection units Cm provided on multiple transmission towers Tm (a natural number of m) to be managed, and a paint deterioration diagnosis device 10 that manages the paint deterioration state of the transmission towers Tm based on the detection results of the detection units Cm.

[0035] A set of test specimens Sn (n: natural number), formed according to the paint condition of the transmission tower Tm, is placed on the tower Tm in an exposed state. The set of test specimens Sn consists of at least one test specimen S. The set of test specimens Sn consists of one or more test specimens S in order to obtain the average value of the detected values. The test specimen S is formed of an electrode S3 provided on the member using a conductive material, and a test coating film S10 formed to cover the electrode S3 using paint used for coating films formed on the surface of structures. The transmission tower Tm is provided with a detection unit Cm for measuring the deterioration state of the test coating film S10 and the test coating substrate S11 of the test specimen S. The detection unit Cm detects the electrical characteristics obtained from the electrode S3 of the test specimen S. The detection unit Cm includes, for example, a non-resistive ammeter and detects the current value output from the electrode S3.

[0036] The detection unit Cm is, for example, connected to the paint deterioration diagnostic device 10 via a network NW based on wired or wireless communication. The detection unit Cm transmits detected values, such as imaging data, to the paint deterioration diagnostic device 10 at periodic measurement timings.

[0037] The paint deterioration diagnostic device 10 is an information processing terminal device for managing the painting timing of the transmission tower Tm that is under management. The paint deterioration diagnostic device 10 can be implemented using, for example, a personal computer, a tablet terminal, or a smartphone. The paint deterioration diagnostic device 10 is connected to the detection unit Cm via a network NW so as to be able to communicate. The paint deterioration diagnostic device 10 includes, for example, an acquisition unit 12 that acquires detection value data from the detection unit Cm, a calculation unit 14 that calculates the lifespan of the paint film based on the detection value, a storage unit 16 that stores data related to the calculation, and a display unit 18 that displays the calculation results.

[0038] The acquisition unit 12 acquires measured values ​​of the paint deterioration state, including the corrosion state of the test coating film S10 and the test coating substrate S11, under the same conditions as the transmission tower Tm. The acquisition unit 12 is a communication interface connected to a local network or a public network. The storage unit 16 has a storage medium such as a hard disk drive (HDD) or flash memory. The storage unit 16 is not necessarily built into the paint deterioration diagnostic device 10 or connected externally, and may be provided on a server (not shown) that provides data via the network. The display unit 18 is a display device such as a liquid crystal display. The display unit 18 displays information regarding the paint deterioration state, including the deterioration state of the coating film on the transmission tower Tm and the corrosion state of the test coating substrate S11.

[0039] Based on the acquired detection values, the paint deterioration diagnostic device 10 determines the deterioration state of the test coating S10 and the corrosion state of the test coating substrate S11 of the test piece S. The calculation unit 14 determines the deterioration state of the test coating S10 and the corrosion state of the test coating substrate S11 of the test piece S based, for example, on the current value output from the test piece S. For example, a threshold is set for determining the deterioration state of the paint on the transmission tower Tm, including the deterioration state of the coating S10 and the corrosion state of the coating substrate, based on a database that shows the degree of paint deterioration of the test piece S, including the deterioration state of the coating S10 and the corrosion state of the coating substrate S11. The threshold may be set in stages according to the deterioration state of the paint, including the deterioration state of the coating and the corrosion state of the coating substrate. The threshold may, for example, indicate the corrosion state of a member S1 in stages, and inspection or repair may be set according to the stage. The calculation unit 14 estimates the deterioration state of the paint, including the deterioration state of the test coating film S10 and the corrosion state of the test coating substrate S11, based on the judgment result. The calculation unit 14 compares the threshold value with the detected value and displays information prompting inspection or repair on the display unit 18 according to the level of the detected value. The calculation unit 14 may, for example, determine the deterioration state of the paint, including the corrosion state of the test coating film S10 and the test coating substrate S11 of the test piece S, based on the detected value, using machine learning with deep learning that uses a database showing the degree of paint deterioration, including the corrosion state of the test coating film S10 and the test coating substrate S11 of the test piece S, as training data.

[0040] Figure 8 shows a flowchart illustrating each step of the paint deterioration diagnosis method using the paint deterioration diagnosis system 1. The manager creates a test piece S using the paint used for the paint film formed on the surface of the steel tower Tm, with a test coating S10 formed on the surface of an electrode part S2 provided on a member S1 using a conductive material (step S100). The test piece S is formed of an electrode S3 made of a first metal and a member S1 made of a second metal different from the electrode S3. The manager exposes the test piece S to a predetermined observation environment (step S102).

[0041] The test specimen S is placed at an observation point where a structure such as a transmission tower Tm is installed. The test specimen S is exposed to the observation environment of the transmission tower Tm. The paint deterioration diagnostic device 10 periodically detects the electrical characteristics obtained from the electrodes of the test specimen S (step S104). The electrical characteristics are observed by detecting the current generated between the electrodes and the member. Based on the detected values ​​of the electrical characteristics detected from the test specimen S, the paint deterioration diagnostic device 10 determines the degree of paint deterioration, including the deterioration state of the paint film on the transmission tower Tm and the corrosion state of the paint substrate (step S106).

[0042] In steps S100 to S104, the test specimen S may be placed in a test device capable of generating a simulated environment that mimics the observation environment at an observation point where a structure such as a steel tower Tm is installed, the test specimen S may be exposed to the simulated environment generated by the test device, and the detected values ​​from the test specimen S may be observed. Alternatively, the electrode S3 of the test specimen S may be processed in advance to a predetermined state of deterioration according to the environment in which it is installed and the current state of deterioration of the steel tower Tm, and the observation may be performed with a test coating S10 formed.

[0043] The program stored in the memory unit 16 causes the computer installed in the paint deterioration diagnostic device 10, which manages the painted surface of the structure, to perform the following processes. The program causes the computer to detect the electrical characteristics obtained from the electrode S3 of the test piece S, and based on the detected values ​​of the electrical characteristics, to determine the degree of paint deterioration, including the deterioration state of the paint film and the corrosion state of the paint substrate between the paint film and the surface of the structure.

[0044] The calculation unit 14 constituting the paint deterioration diagnostic device 10 is realized by a processor such as a CPU (Central Processing Unit) or GPU (Graphics Processing Unit) executing a program (software). Some or all of these functional units may be realized by hardware such as an LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), or FPGA (Field-Programmable Gate Array), or by the cooperation of software and hardware. The program may be stored in a storage device such as an HDD (Hard Disk Drive) or flash memory provided in the storage unit 16 in advance, or it may be stored on a removable storage medium such as a DVD or CD-ROM and installed on the storage device when the storage medium is mounted on a drive device.

[0045] As described above, the paint deterioration diagnosis method allows for the quantitative evaluation of the degree of deterioration of paint on metal structures. The paint deterioration diagnosis method allows for the estimation of the degree of paint deterioration on metal structures by measuring the electrical properties of a test piece S having a test coating S10 that mimics the paint film of an actual structure. The paint deterioration diagnosis method allows for the prediction of the degree of paint deterioration on a structure installed at an observation point by observing the electrical properties of the test piece S. Furthermore, the paint deterioration diagnosis method allows for the management of the paint surface condition and painting timing of all structures under management based on observations of the test piece S.

[0046] [Differentiation] In the above embodiment, the electrode portion S2 in the test piece S is formed by a member S1 made of a first metal and an electrode S3 made of a second metal different from the first metal, and the current is detected using a non-resistive ammeter. The member S1 and electrode S3 are not limited to these and may be made of the same material having electrical conductivity. In this case, the electrode portion S2 may be supplied with voltage using an external power supply instead of a non-resistive ammeter. The detection unit C may detect changes in the current value and voltage value of the electrode portion S2. The voltage applied to the electrode portion S2 may also reproduce the voltage and current values ​​that reproduce the corrosion protection voltage applied to the structure. The material of the electrode portion S2 may be replaced with other materials that have electrical conductivity, such as carbon, rather than metal. The voltage applied to the electrode portion S2 may be AC, not just DC. That is, other materials or methods for detecting other electrical properties may be used as long as it is possible to evaluate changes in the electrical properties of the test piece S.

[0047] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These embodiments can be carried out in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of Symbols]

[0048] 10. Paint deterioration diagnostic device 14 Arithmetic section C, Cm detection unit S Test piece S1 component S2 electrode part S3 electrode S4 Insulating layer S10 Test coating film

Claims

1. A test coating is formed using paint used for coatings formed on the surface of a structure, covering the surface of an electrode portion made of a conductive material on a member made of a first metal, the electrode portion comprising an electrode made of a second metal different from the first metal and an insulating layer that insulates the electrode from the member, and a test piece is prepared in which the test coating is formed after processing at least one of the member or the electrode into a corrosive state. The test specimen is exposed in a predetermined observation environment, The electrical characteristics obtained from the electrode portion are detected, Based on the detected electrical characteristics, the degree of paint deterioration is determined, including the deterioration state of the paint film and the corrosion state of the substrate to which the paint film is in contact. Methods for diagnosing paint deterioration.

2. The aforementioned electrical characteristics detect the current value generated between the electrode and the member. The method for diagnosing paint deterioration according to claim 1.

3. The test specimen is placed at the observation point where the aforementioned structure is installed. The test specimen is exposed to the observation environment at the observation point. The method for diagnosing paint deterioration according to claim 2.

4. The test piece is placed in a test apparatus capable of generating a simulated environment that mimics the observation environment at the observation point where the structure is installed. The aforementioned test apparatus generates the simulated environment and exposes the test specimen to the simulated environment. The method for diagnosing paint deterioration according to claim 2.

5. An electrode portion provided on a member formed of a first metal using a conductive material; a test coating film formed to cover the electrode portion using paint used for coating films formed on the surface of a structure; the electrode portion comprising an electrode formed of a second metal different from the first metal; and an insulating layer that insulates the electrode from the member, wherein the test coating film is formed on a test piece after at least one of the member or the electrode has been processed into a corroded state, and a detection unit for detecting the electrical characteristics obtained from the electrode portion of the test piece. The system includes a calculation unit that determines the degree of paint deterioration, including the deterioration state of the paint film and the corrosion state of the substrate to which the paint film is in contact, based on the detected electrical characteristics. Paint deterioration diagnostic device.

6. A computer installed in a paint deterioration diagnostic device that manages the painted surface of structures, An electrode portion provided on a member formed of a first metal using a conductive material, a test coating film formed to cover the electrode portion using paint used for coating films formed on the surface of a structure, the electrode portion comprising an electrode formed of a second metal different from the first metal, and an insulating layer that insulates the electrode from the member, wherein the electrical characteristics obtained from the electrode portion of a test piece on which the test coating film has been formed after processing at least one of the member or the electrode into a corroded state are detected. Based on the detected values ​​of the electrical characteristics, the degree of paint deterioration, including the deterioration state of the paint film and the corrosion state of the substrate to which the paint film is in contact, is determined. program.

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