A coating aging monitoring device and a monitoring method

Abstract

The present invention discloses a coating aging monitoring device and a monitoring method, comprising: a temperature and humidity sensing probe for real-time monitoring of the ambient temperature and relative humidity of the environment where the coating to be measured is located; a coating monitoring sensing probe including a working electrode, a reference electrode and an auxiliary electrode, for real-time monitoring of the coating impedance of the coating to be measured, and using a plurality of electrodes to be measured obtained by equally dividing the working electrode to perform segmented impedance testing on the coating to be measured, so as to obtain the segmented impedance corresponding to a plurality of segmented coatings obtained by equally dividing the coating to be measured; and a main control module for determining the overall aging degree and local aging degree of the coating to be measured according to a preset algorithm in combination with the data obtained by the temperature and humidity sensing probe and the coating monitoring sensing probe. The present invention uses the temperature and humidity sensing probe and the coating monitoring sensing probe to real-time monitor the ambient temperature and humidity, the coating impedance of the coating to be measured and the segmented coating impedance, and comprehensively considers the influence of environmental factors and local aging degree on the coating aging monitoring effect.

Description

Technical Field

[0001] The present invention relates to the field of material aging monitoring, and in particular to a coating aging monitoring device and a monitoring method. Background Art

[0002] At present, metal materials are widely used in various fields, and people have increasingly higher requirements for the application scenarios, corrosion resistance, and oxidation resistance of metal materials. However, in most application scenarios, it is necessary to do a good job of corrosion protection for metal materials or equipment composed of metal materials, especially in some high-temperature, high-pressure and complex corrosive media environments. Among them, coating protection is an important method for corrosion protection of metal materials. Coatings with excellent performance can prevent pollutants such as water, oxygen, and salt from corroding the metal matrix, thereby ensuring the long-term and safe use of metal materials. However, coatings are easily affected by factors such as light, heat, and ozone, resulting in defects and even aging, which can fail to achieve the protective effect or cause greater corrosion problems. Therefore, coating aging has become a current research focus.

[0003] In order to prevent the aging of the coating from affecting the anti-corrosion effect of the coating and causing failure problems in equipment made of metal materials, it is necessary to monitor the aging of the coating. At present, AC impedance technology is one of the commonly used means to monitor the aging of the coating. It mainly uses parameters such as phase angle (θ), characteristic frequency (fb), specific capacitance (C), impedance modulus (Z) and aging coefficient (δ) to evaluate the aging degree of the coating, or uses the change in resonant frequency caused by the change in resistance or capacitance of the coating to monitor the aging degree of the coating. However, although the above method can realize real-time monitoring of the overall aging of the coating, it is difficult to locate the aging area of the coating, and it is easy to ignore the situation where the overall aging is slight and the local aging is serious, which poses certain hidden dangers. In addition, the above method does not take into account the problem that the monitoring data is easily affected by environmental factors such as temperature and humidity, which in turn affects the monitoring effect of the aging of the coating. Summary of the Invention

[0004] The present invention provides a coating aging monitoring device and a monitoring method, which locate the local aging area of the coating on the basis of real-time monitoring of the coating aging condition to improve the monitoring accuracy.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a coating aging monitoring device, comprising: a temperature and humidity sensor probe, a coating monitoring sensor probe and a main control module;

[0006] The temperature and humidity sensor probe is used to monitor the ambient temperature and relative humidity of the environment in which the coating to be tested is located in real time;

[0007] The coating monitoring and sensing probe includes a working electrode, an auxiliary electrode and a reference electrode, and is used to monitor the coating impedance of the to-be-tested coating in real time. Multiple to-be-tested electrodes equally divided from the working electrode are used to perform segmented impedance testing on the to-be-tested coating, and the segmented impedance corresponding to multiple segmented coatings equally divided from the to-be-tested coating is obtained;

[0008] The main control module is used to determine the overall aging degree and local aging degree of the to-be-tested coating according to a preset algorithm and in combination with the data obtained by the temperature and humidity sensing probe and the coating monitoring and sensing probe.

[0009] Implementing the embodiments of the present application, by using the temperature and humidity sensing probe and the coating monitoring and sensing probe, the ambient temperature, the ambient relative humidity and the coating impedance of the to-be-tested coating are monitored in real time, and segmented impedance testing is performed on the to-be-tested coating to obtain multiple segmented impedances. Based on the above data, the overall aging degree and local aging degree of the to-be-tested coating are determined respectively. Furthermore, the aging situation of the to-be-tested coating can be judged from both the overall and local aspects, avoiding simply considering the overall aging degree and ignoring the situation where the overall aging is slight while the local aging is serious, thereby ensuring the accuracy of aging monitoring.

[0010] As a preferred solution, the main control module specifically includes an overall processing unit and a local processing unit;

[0011] The overall processing unit is used to calculate a temperature and humidity correction value according to the ambient temperature and the ambient relative humidity, and in combination with the coating impedance, calculate the coating porosity corresponding to the to-be-tested coating, and further determine the overall aging degree of the to-be-tested coating;

[0012] The local processing unit is used to calculate the corrosion ratio of each segmented coating according to the coating impedance and each segmented impedance, and further determine the local aging degree of the to-be-tested coating.

[0013] Implementing the preferred solution of the embodiments of the present application, through the overall processing unit, according to the monitored ambient temperature and ambient relative humidity, a temperature and humidity correction value is introduced to avoid the influence of environmental factors on the calculation of the coating porosity and improve the effectiveness of the data. At the same time, according to the corrosion ratio of the segmented coating, the local aging degree of the to-be-tested coating is determined, and the positioning of the local aging area of the coating is realized.

[0014] The coating aging monitoring device further includes: an early warning module, wherein the early warning module specifically includes a buzzer chip and an indicator light;

[0015] The buzzer chip is used to emit a beeping sound when the coating porosity is greater than or equal to a first threshold or the corrosion ratio is greater than or equal to a second threshold;

[0016] The indicator light is used to emit a bright light while the buzzer chip of the buzzer module emits a buzzer sound.

[0017] Implementing the preferred solution of the embodiments of the present application, through the buzzer chip and the indicator light of the warning module, when the coating porosity or the corrosion ratio of the segmented coating meets the warning conditions, a buzzer sound and a bright light are emitted to remind the user that the to-be-tested coating is severely aged.

[0018] As a preferred solution, the working electrode and the auxiliary electrode are spirally wound to form a spiral coiled structure, the reference electrode is located at the center of the spiral coiled structure, and an insulating layer is provided between adjacent electrodes of the spiral coiled structure, and the insulating layer is made of an insulating material.

[0019] Implementing the preferred solution of the embodiments of the present application, the user can adjust the number of the working electrode and the auxiliary electrode in the coating monitoring sensing probe according to their actual needs. When the number is increased, the effective test area between the working electrode and the auxiliary electrode increases accordingly, and correspondingly, the sensitivity of the coating monitoring sensing probe is improved, which is convenient for detecting the local aging condition of the to-be-tested coating by using the coating monitoring sensing probe.

[0020] As a preferred solution, the coating aging monitoring device further includes: a power supply module and a data transmission module;

[0021] The power supply module includes an external power supply and a reserve battery, and is used to provide kinetic energy or standby kinetic energy for the coating aging monitoring device;

[0022] The data transmission module is used to transmit the data monitored by the temperature and humidity sensing probe and the coating monitoring sensing probe to the main control module.

[0023] Implementing the preferred solution of the embodiments of the present application, two power supply methods are provided for the coating aging monitoring device. When the external power supply or the reserve battery cannot supply power normally, another power supply method is adopted to ensure the normal operation of the coating aging monitoring device. Additionally, the data transmission module is used to realize the transmission of data in the coating aging monitoring device.

[0024] To solve the same technical problem, an embodiment of the present invention further provides a coating aging monitoring method, including:

[0025] Using the temperature and humidity sensing probe to monitor the ambient temperature and the ambient relative humidity of the environment where the to-be-tested coating is located in real time;

[0026] Using the coating monitoring sensing probe to monitor the coating impedance of the to-be-tested coating in real time; wherein, the coating monitoring sensing probe includes a working electrode, an auxiliary electrode and a reference electrode;

[0027] Equally divide the working electrode to obtain a plurality of corresponding electrodes to be measured, and use the plurality of electrodes to be measured to perform segmented impedance testing on the coating to be measured, and obtain the segmented impedance corresponding to a plurality of segmented coatings obtained by equally dividing the coating to be measured;

[0028] According to a preset algorithm, combine the data obtained by the temperature and humidity sensing probe and the coating monitoring sensing probe to determine the overall aging degree and local aging degree of the coating to be measured.

[0029] As a preferred solution, the determining the overall aging degree and local aging degree of the coating to be measured according to a preset algorithm and combining the data obtained by the temperature and humidity sensing probe and the coating monitoring sensing probe is specifically:

[0030] Calculate a temperature and humidity correction value according to the ambient temperature and the ambient relative humidity, and combine the coating impedance to calculate the coating porosity corresponding to the coating to be measured, and then determine the overall aging degree of the coating to be measured;

[0031] Calculate the corrosion ratio of each segmented coating according to the coating impedance and each segmented impedance, and then determine the local aging degree of the coating to be measured.

[0032] As a preferred solution, the coating aging monitoring method further includes:

[0033] When the coating porosity is greater than or equal to a first threshold, it is determined that the overall aging degree of the coating to be measured is serious, and at the same time, a beeping sound is emitted and an indicator light is lit;

[0034] When the corrosion ratio of the segmented coating is greater than or equal to a second threshold, it is determined that the aging degree of the current segmented coating is serious, and at the same time, a beeping sound is emitted and an indicator light is lit.

[0035] As a preferred solution, the working electrode and the auxiliary electrode are spirally wound to form a spiral structure, the reference electrode is located at the center of the spiral structure, and an insulating layer is provided between adjacent electrodes of the spiral structure, and the insulating layer is made of an insulating material. Description of the Drawings

[0036] Figure 1 : Schematic structural diagram of the coating monitoring sensing probe of a coating aging monitoring device provided in Embodiment 1 of the present invention;

[0037] Figure 2 : Schematic structural diagram of a coating aging monitoring device provided in Embodiment 1 of the present invention;

[0038] Figure 3 : Schematic flowchart of a coating aging monitoring method provided in Embodiment 2 of the present invention;

[0039] Figure 4 : A schematic diagram of a data processing flow of a coating aging monitoring method provided in Example 2 of the present invention;

[0040] Figure 5 : A flow chart of a coating aging monitoring method provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] Example 1:

[0043] Please refer to Figure 1 , which is a structural schematic diagram of a coating monitoring sensor probe 10 in a coating aging monitoring device provided in an embodiment of the present invention, mainly shows the structural relationship between the fixing hole 11, outer frame 12, working electrode 13, auxiliary electrode 14 and reference electrode 15 in the coating monitoring sensor probe 10. Among them, the fixing hole 11 is used for fixing or installation, the outer frame 12 is used to shield the outside world, the working electrode 13 and the auxiliary electrode 14 are spirally wound to form a spiral winding structure, the reference electrode 15 is located at the center of the spiral winding structure, and an insulating layer composed of insulating material is provided between adjacent electrodes of the spiral winding structure. Among them, the insulating material can be epoxy resin or other insulating polymer materials, which mainly plays an insulating isolation role.

[0044] Based on the above structure, users can adaptively adjust the number of working electrodes 13 and auxiliary electrodes 14 in the coating monitoring sensor probe 10 according to their actual needs. When the number is increased, the effective test area between the working electrode 13 and the auxiliary electrode 14 increases, which correspondingly improves the sensitivity of the coating monitoring sensor probe 10, making it easier to use the coating monitoring sensor probe 10 to detect local aging of the coating to be tested, and is conducive to detecting relatively subtle coating aging conditions.

[0045] Additionally, please refer to Figure 2 In addition to the coating monitoring sensor probe 10, the coating aging monitoring device provided by the embodiment of the present invention also includes a temperature and humidity sensor probe 20, a main control module 30, an early warning module 40, a power supply module 50 and a data transmission module 60. Its functions are as follows:

[0046] The coating monitoring sensor probe 10 is used to monitor the coating impedance R of the coating to be tested in real time, and to perform segmented impedance testing on the coating to be tested using multiple electrodes to be tested obtained by equally dividing the working electrode 13, and obtain the segmented impedance R corresponding to the multiple segmented coatings obtained by equally dividing the coating to be tested. j , providing data support for the subsequent positioning of coating aging areas. j represents the impedance value of the jth coating segment. The more segments the working electrode has, the more accurately it can locate the local aging of the coating under test. Therefore, users can adjust the number of working electrode segments based on their needs and the size of the working electrode, thereby improving the monitoring accuracy of the coating aging monitoring device within the permitted range.

[0047] The temperature and humidity sensor probe 20 is used to monitor the ambient temperature T and relative humidity RH of the environment where the coating to be tested is located in real time, in preparation for the calculation of the temperature and humidity correction value.

[0048] The main control module 30 is used to determine the overall aging degree and local aging degree of the coating to be tested based on a preset algorithm and in combination with the data obtained by the coating monitoring sensor probe 10 and the temperature and humidity sensor probe 20.

[0049] Furthermore, as a preferred solution of this embodiment, the main control module 30 specifically includes an overall processing unit and a local processing unit, and its functions are as follows:

[0050] The overall processing unit is used to calculate the temperature and humidity correction value f(RH,T) according to the ambient temperature T and the ambient relative humidity RH, referring to formula (1), and then referring to formula (2), combined with the coating resistance R, to calculate the coating porosity P corresponding to the coating to be tested, and then determine the overall aging degree of the coating to be tested. Among them, ΔT is the difference between the ambient temperature T and the preset temperature value of 25°C, ΔRH is the difference between the ambient relative humidity RH and the preset relative humidity value of 80%, and R cf It is the coating impedance value when the coating fails completely under the environmental conditions of temperature of 25℃ and relative humidity of 80%.

[0051] By introducing the temperature and humidity correction value f(RH,T), the calculation of the coating porosity P is prevented from being affected by environmental factors, the validity of the data is improved, and the overall aging degree of the coating to be tested is determined based on the coating porosity P and combined with preset rules.

[0052]

[0053]

[0054] The local processing unit is used to calculate the impedance of the coating R and each segment impedance R j, referring to formula (3), the corrosion ratio F of each segmented coating is calculated, and then the local aging degree of the coating to be tested is determined.

[0055] By performing impedance testing on the coating to be tested, the aging degree of each segmented coating is determined one by one, and the local aging area of the coating is located. The corrosion ratio F of all segmented coatings is combined with preset rules to determine the local aging degree of the coating to be tested.

[0056]

[0057] By implementing the embodiments of the present application, the aging condition of the coating to be tested is comprehensively determined from both overall and local aspects. Compared with determining the coating aging condition only based on the overall aging degree, the coating aging monitoring device provided by the embodiments of the present application can avoid ignoring the situation where the overall aging is mild but the local aging is severe, thereby ensuring the accuracy of coating aging monitoring.

[0058] The early warning module 40 specifically includes a buzzer chip and an indicator light, which is used to emit a buzzer sound and a bright light when the coating porosity P is greater than or equal to a first threshold or the corrosion ratio F is greater than or equal to a second threshold.

[0059] As an example, the first threshold is 80%, the second threshold is 20%, and P ≥ 80% or F ≥ 20% are used as warning conditions for a coating aging monitoring device provided by an embodiment of the present invention. When P ≥ 80%, the overall aging of the coating to be tested is determined to be severe; when F ≥ 20%, the aging of the current segmented coating is determined to be severe, that is, the local aging of the coating to be tested is severe. The above two situations meet the warning conditions, so the buzzer chip and indicator light are activated to alert the user.

[0060] The power supply module 50, which includes an external power supply and a reserve battery, is used to provide kinetic energy or backup kinetic energy to the coating aging monitoring device. This provides the device with two power supply options. If either the external power supply or the reserve battery fails, the other power supply option is used to ensure normal operation of the device. The external power supply can be connected to a DC power source or other energy sources, such as solar power. The reserve battery is a high-capacity rechargeable battery, allowing for diverse power supply modes.

[0061] The data transmission module 60 transmits data collected by the temperature and humidity sensors and the coating monitoring sensor to the main control module. Furthermore, when the coating porosity P or corrosion ratio F meets the warning conditions, the data transmission module 60 can also provide feedback to the user, thus enabling real-time data transmission within the coating aging monitoring device.

[0062] The above describes in detail the relevant devices of the embodiments of the present invention, and the following provides the methods of the embodiments of the present application.

[0063] Example Two:

[0064] Please refer to Figure 3 , Figure 3 which is a schematic flowchart of a coating aging monitoring method provided by an embodiment of the present invention. This method includes steps S1 to S4, and the specific steps are as follows:

[0065] Step S1: Use a temperature and humidity sensing probe to continuously monitor the ambient temperature and relative humidity of the environment where the coating to be measured is located.

[0066] Step S2: Use a coating monitoring sensing probe to continuously monitor the coating impedance of the coating to be measured; among them, the coating monitoring sensing probe includes a working electrode, a reference electrode, and an auxiliary electrode.

[0067] Step S3: Divide the working electrode equally to obtain multiple corresponding electrodes to be measured, and use the multiple electrodes to be measured to perform segmented impedance testing on the coating to be measured, and obtain the segmented impedance corresponding to multiple segmented coatings obtained by equally dividing the coating to be measured.

[0068] Step S4: According to a preset algorithm, combine the data obtained by the temperature and humidity sensing probe and the coating monitoring sensing probe to determine the overall aging degree and local aging degree of the coating to be measured.

[0069] As a preferred solution of this embodiment, please refer to Figure 4 , step S4 representing the data processing flow specifically includes steps S401 to S402, and the specific steps are as follows:

[0070] Step S401: Calculate the temperature and humidity correction value according to the ambient temperature and relative humidity, and combine the coating impedance to calculate the coating porosity corresponding to the coating to be measured, and then determine the overall aging degree of the coating to be measured.

[0071] Step S402: Calculate the corrosion ratio of each segmented coating according to the coating impedance and each segmented impedance, and then determine the local aging degree of the coating to be measured.

[0072] Example Three:

[0073] Please refer to Figure 5 , a coating aging monitoring method provided by the present invention further includes steps S5 to S6, and the specific steps are as follows:

[0074] Step S5: When the coating porosity is greater than or equal to the first threshold, it is determined that the overall aging degree of the coating to be measured is serious, and at the same time, a beeping sound is emitted and the indicator light is lit.

[0075] Step S6: When the corrosion ratio of the segmented coating is greater than or equal to the second threshold, it is determined that the aging degree of the current segmented coating is serious, and at the same time, a beeping sound is emitted and the indicator light is lit.

[0076] As a preferred solution, the working electrode and the auxiliary electrode are spirally coiled to form a spiral coiled structure, the reference electrode is located at the center of the spiral coiled structure, and an insulating layer is provided between adjacent electrodes of the spiral coiled structure, and the insulating layer is made of an insulating material.

[0077] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the above-described method can refer to the corresponding process in the foregoing related device embodiments, and will not be elaborated herein.

[0078] The specific embodiments described above have further elaborated the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. In particular, it is pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coating aging monitoring device, characterized in that: include: Temperature and humidity sensor probes, coating monitoring sensor probes and main control module; The temperature and humidity sensor probe is used to monitor the ambient temperature and relative humidity of the environment in which the coating to be tested is located in real time; The coating monitoring sensor probe includes a working electrode, an auxiliary electrode, and a reference electrode, and is used to monitor the coating impedance of the coating to be tested in real time, and to perform a segmented impedance test on the coating to be tested using a plurality of electrodes to be tested equally divided from the working electrode, thereby obtaining segmented impedances corresponding to the plurality of segmented coatings equally divided from the coating to be tested; The main control module is used to determine the overall aging degree and local aging degree of the coating to be tested based on a preset algorithm and in combination with the data obtained by the temperature and humidity sensor probe and the coating monitoring sensor probe; The main control module specifically includes an overall processing unit and a local processing unit; The overall processing unit is used to calculate the temperature and humidity correction value according to the ambient temperature and the ambient relative humidity, and calculate the coating porosity corresponding to the coating to be tested in combination with the coating impedance, thereby determining the overall aging degree of the coating to be tested; The local processing unit is used to calculate the corrosion ratio of each segmented coating according to the coating impedance and each segmented impedance, and then determine the local aging degree of the coating to be tested; When the coating porosity is greater than or equal to a first threshold, the overall aging degree of the coating to be tested is determined to be serious; when the corrosion ratio of the segmented coating is greater than or equal to a second threshold, the aging degree of the current segmented coating is determined to be serious; The calculation formula of the temperature and humidity correction value is: The calculation formula of the coating porosity is: The calculation formula of the corrosion ratio is: Where f(RH,T) is the temperature and humidity correction value; ΔT is the difference between the ambient temperature T and the preset temperature value of 25°C; ΔRH is the difference between the ambient relative humidity RH and the preset relative humidity value of 80%; P is the coating porosity; R cf is the coating impedance value when the coating is completely failed under the environmental conditions of temperature 25℃ and relative humidity 80%; R is the coating impedance; R j is the impedance value of the jth section coating; F is the corrosion ratio.

2. A coating aging monitoring device according to claim 1, characterized in that: Also includes: An early warning module, wherein the early warning module specifically includes a buzzer chip and an indicator light; The buzzer chip is configured to emit a buzzer sound when the coating porosity is greater than or equal to a first threshold or the corrosion ratio is greater than or equal to a second threshold; The indicator light is used to emit a bright light while the buzzer chip emits a buzzing sound.

3. A coating aging monitoring device according to claim 1, characterized in that: The working electrode and the auxiliary electrode are spirally wound to form a spirally coiled structure. The reference electrode is located at the center of the spirally coiled structure. An insulating layer is provided between adjacent electrodes of the spirally coiled structure, and the insulating layer is made of insulating material.

4. A coating aging monitoring device according to claim 1, characterized in that: Also includes: Power supply module and data transmission module; The power supply module includes an external power supply and a reserve battery, and is used to provide kinetic energy or backup kinetic energy for the coating aging monitoring device; The data transmission module is used to transmit the data monitored by the temperature and humidity sensor probe and the coating monitoring sensor probe to the main control module.

5. A coating aging monitoring method, characterized in that: include: Use temperature and humidity sensor probes to monitor the ambient temperature and relative humidity of the environment where the coating to be tested is located in real time; Using a coating monitoring sensor probe to monitor the coating impedance of the coating to be tested in real time; wherein the coating monitoring sensor probe includes a working electrode, an auxiliary electrode and a reference electrode; The working electrode is equally divided to obtain a plurality of corresponding electrodes to be tested, and the plurality of electrodes to be tested are used to perform a segmented impedance test on the coating to be tested, to obtain segmented impedances corresponding to the plurality of segmented coatings obtained by equally dividing the coating to be tested; Determine the overall aging degree and local aging degree of the coating to be tested based on a preset algorithm and in combination with the data obtained by the temperature and humidity sensor probe and the coating monitoring sensor probe; The overall aging degree and local aging degree of the coating to be tested are determined according to the preset algorithm in combination with the data obtained by the temperature and humidity sensor probe and the coating monitoring sensor probe, specifically: Calculating a temperature and humidity correction value based on the ambient temperature and the ambient relative humidity, and calculating the coating porosity corresponding to the coating to be tested in combination with the coating impedance, thereby determining the overall aging degree of the coating to be tested; Calculating the corrosion ratio of each segmented coating based on the coating impedance and each segmented impedance, thereby determining the local aging degree of the coating to be tested; When the coating porosity is greater than or equal to a first threshold, the overall aging degree of the coating to be tested is determined to be serious; when the corrosion ratio of the segmented coating is greater than or equal to a second threshold, the aging degree of the current segmented coating is determined to be serious; The calculation formula of the temperature and humidity correction value is: The calculation formula of the coating porosity is: The calculation formula of the corrosion ratio is: Where f(RH,T) is the temperature and humidity correction value; ΔT is the difference between the ambient temperature T and the preset temperature value of 25°C; ΔRH is the difference between the ambient relative humidity RH and the preset relative humidity value of 80%; P is the coating porosity; R cf is the coating impedance value when the coating is completely failed under the environmental conditions of temperature 25℃ and relative humidity 80%; R is the coating impedance; R j is the impedance value of the jth section coating; F is the corrosion ratio.

6. A coating aging monitoring method according to claim 5, characterized in that: Also includes: When it is determined that the overall aging degree of the coating to be tested is serious or the aging degree of the current segmented coating is serious, a buzzer sounds and an indicator light is turned on.

7. A coating aging monitoring method according to claim 6, characterized in that: The working electrode and the auxiliary electrode are spirally wound to form a spirally coiled structure. The reference electrode is located at the center of the spirally coiled structure. An insulating layer is provided between adjacent electrodes of the spirally coiled structure, and the insulating layer is made of insulating material.

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