Coating aging detection method based on electrically coupled antenna technology

Abstract

The invention relates to the technical field of organic coating detection, in particular to a coating aging detection method based on an electrically coupled antenna technology, which comprises an NFC pre-embedded circuit structure, the NFC pre-embedded circuit structure comprises an induction coil layer, the upper layer of the induction coil layer is coated with a first bonding layer, a protective coating is arranged above the first bonding layer, and the first bonding layer is coated with a second bonding layer. The bottom of the induction coil layer is provided with a high-magnetic-conductivity material layer, the lower layer of the high-magnetic-conductivity material layer is coated with a second bonding layer, and a base layer is arranged below the second bonding layer. As the coating can cover the pre-embedded circuit, nondestructive testing can be realized based on a non-contact induction testing technology, the detection efficiency is greatly improved, the duration of equipment is shortened, and direct, reliable and complex analysis steps are provided for long-term operation of the equipment and state monitoring of the coating. Detection of the NFC pre-embedded circuit is not limited by external environment conditions, and stable signal detection can still be carried out no matter the surface of the coating is subjected to salt mist and moisture or even under water.

Description

Technical Field

[0001] The present invention relates to the technical field of organic coating detection, and specifically provides a coating aging detection method based on electro-coupled antenna technology. Background Art

[0002] As an economical, efficient and convenient anti-corrosion means, organic coatings are widely used on the surface of metal structures. Its protection principle is to form a physical barrier between the metal and the corrosive medium to block the erosion of the corrosive medium. However, in practical applications, the coating will inevitably be affected by environmental factors such as ultraviolet rays, temperature, humidity and corrosive media. Especially in the marine environment, due to factors such as salt spray corrosion, the coating performance gradually deteriorates, such as the decrease in anti-permeability and the weakening of adhesion, ultimately leading to substrate corrosion. On ships, especially for marine electronic equipment that is more sensitive to the hazards brought by coating aging, evaluating the durability of organic coatings in harsh environments is crucial for ensuring the reliability of electronic equipment and the service life of metal structures.

[0003] Traditional coating accelerated aging evaluation methods include salt spray test, ultraviolet aging test, immersion test and artificial climate accelerated test, etc. Although these methods can simulate the aging process in the actual environment, they have the disadvantages of long test cycle, high cost and strong subjectivity of evaluation results, which limit their application in coating evaluation. However, these evaluations are basically indirect evaluations, with a large deviation from the aging situation in the actual environment, and they cannot perform real-time non-destructive detection, lacking direct detection evidence for equipment maintenance guidance.

[0004] Currently, newer technologies are used for coating aging. EIS (Electrochemical Impedance Spectroscopy) is used for the latest surface coating aging detection. Electrochemical Impedance Spectroscopy (EIS) is a powerful tool that can be used to monitor the corrosion situation of the coating in real time. By analyzing the EIS spectrum, multiple electrochemical parameters reflecting the coating performance can be obtained, such as solution resistance, coating resistance, double-layer capacitance, etc. The changes in these parameters can be used to evaluate the degree of coating deterioration and predict the coating life, so as to provide guidance for coating maintenance. However, in the actual operating marine environment, it is extremely difficult to detect coating aging in real time. Due to the presence of salt spray on the measured surface, there are too many test environment interference factors, and the effectiveness and accuracy of the electrochemical impedance spectroscopy detection conclusion deviate greatly. Improving the detection environment will also bring the problem of a significant increase in detection time and detection cost. Therefore, a new non-destructive, highly sensitive, reliable and low-cost solution is needed for coating detection. Summary of the Invention

[0005] The purpose of the present invention is to provide a coating aging detection method based on electro-coupled antenna technology to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: A coating aging detection method based on electric coupling antenna technology, including an NFC embedded circuit structure, the NFC embedded circuit structure includes an induction coil layer, a first adhesive layer is coated on the upper layer of the induction coil layer, a protective coating is above the first adhesive layer, a high magnetic permeability material layer is provided at the bottom of the induction coil layer, a second adhesive layer is coated on the lower layer of the high magnetic permeability material layer, and a base layer is below the second adhesive layer.

[0007] Preferably, the induction coil layer includes an NFC chip, a filtering circuit, a matching circuit and an induction coil; The NFC chip is connected to an antenna, and the physical parameters of this antenna, such as length, width and shape, etc., must be precisely designed to ensure the effective transmission and reception of signals, so as to meet the performance requirements of the NFC chip; The induction coil is used to communicate with external devices through electromagnetic induction. To ensure the normal operation of the induction coil, its response frequency must match the input and output requirements of the NFC (Near Field Communication) chip; The filtering circuit is used to adjust the parameters of the induction coil. First, the number of turns of the coil can be optimized to adjust the intensity of the electromagnetic field and the resonance frequency of the coil, thereby affecting its sensitivity and accuracy in the test; Second, the physical size of the coil, including its diameter or length, can be adjusted according to the test requirements to adapt to different sizes of detection areas; In addition, the spacing between the wires in the coil can also be finely adjusted, which can not only affect the uniformity of the electromagnetic field, but also further optimize the performance of the coil. By adjusting these variables, the matching circuit can adapt to the area of different detection areas to a certain extent, ensuring that the area covered by the coil is consistent with the sensitive area. This is particularly important for ensuring the complete coverage of the measured coating area, because only when the induction area of the coil completely covers the coating test area, the test results will have the greatest accuracy and reliability. Therefore, the flexible adjustment ability of the filtering circuit can help the coil better adapt to different measurement scenarios and ensure the complete coverage of the desired coating area in the test.

[0008] Preferably, the high magnetic permeability material layer is used to deal with the eddy current interference that the metal base layer may cause to the electromagnetic coupling signal. When the electromagnetic field contacts the metal material, the metal will generate an eddy current effect, thereby weakening the signal transmission and accuracy. To avoid this problem, the high magnetic permeability material layer can effectively guide and concentrate the magnetic field, preventing the eddy current generated by the metal base layer from interfering with the coupling signal.

[0009] Preferably, the high magnetic permeability material layer is also used to enhance the magnetic flux of the circuit. By increasing the magnetic flux, the induced signal becomes stronger and more obvious, thereby improving the sensitivity of the detection device and the accuracy of signal detection. This is very important for optimizing the performance of the detection system. Especially in the coated area, the enhancement of the magnetic flux can ensure more stable signal transmission and improve the overall detection effect.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. A coating aging detection method based on electric coupling antenna technology proposed by the present invention uses near-field communication (NFC) technology as the core of the embedded circuit, so that the circuit of the electrically connected coil requires additional power supply in actual applications. The NFC circuit realizes energy transmission and information interaction through electromagnetic induction. Therefore, in the embedded circuit, the coil itself can be driven by the electric energy provided by an external NFC device, without consuming an additional battery or external power supply. The advantage of this design is that once the circuit is embedded under the shell, there is no need to worry about the battery running out or replacing the battery. This not only ensures the integrity of the coating but also extends the service life and reliability of the system. Especially in environments where maintenance is difficult, such as offshore facilities or chemical equipment, it has extremely high practical value.

[0011] 2. Since the coating can cover the embedded circuit, non-contact inductive testing technology can achieve non-destructive testing. This means that the detection device can completely perform inductive testing through the NFC signal without damaging or peeling the coating, thus maintaining the defects of the coating. This non-destructive testing technology has the advantages of being fast and can quickly obtain the status information of the circuit under the coating in a short time. Through this process, the detection personnel can quickly judge the operating condition of the circuit under the coating, and this detection method greatly improves the detection efficiency, reduces the equipment downtime, and provides a direct, reliable, and complex analysis step for the long-term operation of the equipment and the status monitoring of the coating.

[0012] 3. The detection of the NFC embedded circuit is not restricted by external environmental conditions. Whether the surface of the coating is exposed to salt spray, humidity, or even underwater, stable signal detection can still be carried out. This makes the NFC inductive detection technology applicable to more diverse scenarios, such as marine, humid, high-salinity environments, and even underwater environments. Through this real-time detection technology, the degree of aging suffered can be continuously monitored in different environments, and richer and more continuous measured data can be obtained. These data can not only help evaluate the coating in various parameter environments but also provide a scientific basis for formulating a coating protection plan. In addition, based on these detection data, it also provides practical guiding significance for the selection of coating materials, process optimization, and improvement of actual construction processes, thereby enhancing the overall protection of the coating. Description of the Drawings

[0013] Figure 1 This is a schematic diagram of the NFC embedded circuit structure of the present invention.

[0014] Figure 2 This is a schematic diagram of the induction coil layer structure of the present invention.

[0015] In the figure: protective coating 1, first adhesive layer 2, induction coil layer 3, NFC chip 301, filter circuit 302, matching circuit 303, induction coil 304, high magnetic permeability material layer 4, second adhesive layer 5, base layer 6. Specific embodiments

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] Please refer to Figures 1 to 2 , the present invention provides a technical solution: a coating aging detection method based on electric coupling antenna technology, including an NFC embedded circuit structure. The NFC embedded circuit structure includes an induction coil layer 3. An upper layer of the induction coil layer 3 is coated with a first adhesive layer 2. Above the first adhesive layer 2 is the protective coating 1. A high magnetic permeability material layer 4 is provided at the bottom of the induction coil layer 3. A lower layer of the high magnetic permeability material layer 4 is coated with a second adhesive layer 5. Below the second adhesive layer 5 is the base layer 6.

[0018] The induction coil layer 3 includes an NFC chip 301, a filter circuit 302, a matching circuit 303, and an induction coil 304; the NFC chip 301 is connected to an antenna. The physical parameters of this antenna, such as length, width, and shape, etc., must be precisely designed to ensure the effective transmission and reception of signals, so as to meet the performance requirements of the NFC chip; the induction coil 304 is used to communicate with external devices through electromagnetic induction. In order to ensure the normal operation of the induction coil, its response frequency must match the input and output requirements of the NFC (Near Field Communication) chip; The filtering circuit 302 is used to adjust the parameters of the induction coil 304. The four parameters of the series equivalent inductance of the PCB antenna in the coil, the parallel equivalent inductance of the PCB antenna, the series equivalent resistance of the PCB antenna, and the self-resonant frequency are affected by nine physical parameters, namely, the length of the antenna coil, the width of the antenna coil, the width of the antenna trace, the line spacing of the antenna trace, the overlapping area, the trace thickness, the number of turns of the antenna coil, the PCB thickness, and the dielectric constant of the PCB. First, the number of turns of the coil can be optimized to adjust the intensity of the electromagnetic field and the resonance frequency of the coil, thereby affecting its sensitivity and accuracy in testing. Second, the physical dimensions of the coil, including its diameter or length, can be adjusted according to the test requirements to adapt to detection areas of different sizes. In addition, the spacing between the wires in the coil can also be finely adjusted, which can not only affect the uniformity of the electromagnetic field but also further optimize the performance of the coil. By adjusting these variables, the matching circuit can, to a certain extent, adapt to the areas of different detection regions and ensure that the area covered by the coil coincides with the sensitive region. This is particularly important for ensuring the complete coverage of the measured coating area because only when the induction area of the coil completely covers the coating test area can the test results be maximally accurate and reliable. Therefore, the flexible adjustment ability of the filtering circuit 302 can help the coil better adapt to different measurement scenarios and ensure the complete coverage of the desired coating area in testing.

[0019] In the induction system of the coil, as the corrosion effect in the environment gradually intensifies, the coating on the coil surface may be affected by external factors such as humidity, temperature, and chemicals, resulting in deformation or damage to the coating structure. A humid environment may cause the coating material to absorb moisture and expand, temperature fluctuations may cause the material to expand and contract thermally, and chemicals, especially acidic and alkaline substances, will accelerate the degradation and oxidation reactions of the coating material. Deformation and damage not only change the mechanical and chemical properties of the coating but also significantly affect the performance of the induction coil it covers.

[0020] As the physical structure of the coating changes, multiple physical parameters of the coil itself will also be affected. These parameters include resistance, conductivity, inductance, capacitance, magnetic permeability, impedance, resonance frequency, temperature coefficient, etc., a total of 9 cases. For example, after the coating is damaged, the resistance may increase, the conductivity may decrease, and the values of inductance and capacitance may shift. These changes not only affect the basic electrical performance of the coil but also affect the distribution characteristics of its electromagnetic field. In particular, the deterioration of the coating may cause a change in the electromagnetic wave transmission path, making the overall electromagnetic characteristics of the coil increase.

[0021] Changes in these physical parameters will be directly reflected in the electromagnetic characteristics of the coil, especially the electromagnetic wave echo signal of the NFC (Near Field Communication) coil. When the coil is exposed to a corrosive environment, the coating gradually ages, and changes in physical parameters such as inductance and resistance will significantly affect the electromagnetic coupling effect of the coil, thereby affecting the waveform of the echo signal. In an ideal state, the echo signal should remain stable, and its shape and intensity reflect the health status of the coil. However, when undergoing gradual aging or damage, the echo waveform will change accordingly, possibly exacerbating the decline in signal amplitude, distortion of the echo shape, or differences in amplitude and phase.

[0022] Therefore, by monitoring and analyzing the echo signal of the NFC coil, the aging condition of the coating can be qualitatively judged. By directly observing the shape of the echo signal, such as judging the degree of abnormal signal change or frequency deviation, it is possible to quickly identify whether the coating is in good condition. At the same time, with the help of more refined analysis tools, such as change or signal processing algorithms, quantitative analysis of the echo signal can also be carried out, so as to accurately evaluate the aging speed and degree of the coating in a corrosive environment. Based on the analysis results, researchers can better understand the deterioration process of the coating and determine the time course of coating aging.

[0023] This method provides an effective technical means for the corrosion resistance of coating materials and the long-term reliability of induction coils in the electrode electronic environment. Through in-depth analysis of the signal waveform, not only can the corrosion resistance of different coating materials be verified, but also a scientific basis can be provided for future coating selection, design, and optimization. In addition, this electromagnetic signal-based monitoring method also provides theoretical and data support for preventive maintenance. By continuously monitoring the changes in the coil echo signal, potential problems can be detected in a timely manner before the coating fails, so as to take mitigation measures to slow down coating aging or perform repairs. This technical means can effectively extend the service life of equipment, reduce maintenance costs, and improve the overall safety and reliability of equipment.

[0024] In summary, by accurately analyzing the changes in the coil echo signal, it can not only help researchers and engineers monitor the aging status of the coating in real time, but also provide accurate judgments for the maintenance of industrial equipment, ensuring the operation of equipment in various complex environments.

[0025] Currently, traditional NFC antennas usually use copper wire as the main material, and copper wire is widely used due to its excellent electrical conductivity. However, the performance of copper wire in a corrosive environment is significantly different from the substrates used (such as plastics, ceramics, or metals). Copper wire is prone to corrosion, especially under the monitoring of moisture, salts, or chemical substances, which will accelerate the oxidation of its surface, thereby affecting its electrical conductivity and mechanical strength. Although the electrical conductivity of copper wire is very high, its corrosion resistance is relatively reduced, which limits its use in measurement environments where the corrosion degree of the base layer is inconsistent.

[0026] Taking this into account, in some special application scenarios, if the substrate of the NFC antenna is metal (such as steel or aluminum), the induction coil can be directly made of the substrate metal. By using the substrate metal radio-frequency traditional copper wire as the coil material, a balance can be achieved between conductivity and corrosion resistance, and a more accurate simulation of the coil aging behavior in a corrosive environment can also be realized. Since the substrate and the induction coil material are the same, this design can more realistically reflect the state of the coil in different corrosive environments.

[0027] Through this method, the test data can be used to deeply study the performance of different metal materials in a corrosive environment and simulate the aging process of the coil under actual working conditions. Using the substrate metal as the coil can avoid excessive corrosion between materials. This technical means is particularly suitable for NFC devices that need to be in contact with a corrosive environment for a long time, such as the ocean, chemical plants, or a well-ventilated high-salt environment.

[0028] The high-permeability material layer 4 is used to deal with the eddy current interference that the metal base layer may cause to the electromagnetic coupling signal. When the electromagnetic field contacts the metal material, eddy currents will be generated in the metal, thus weakening the signal transmission and accuracy. To avoid this problem, the high-permeability material layer 4 can effectively guide and concentrate the magnetic field, preventing the eddy currents generated by the metal base layer from interfering with the coupling signal.

[0029] The high-permeability material layer 4 is also used to enhance the magnetic flux of the circuit. By increasing the magnetic flux, the induced signal becomes stronger and more obvious, thus improving the sensitivity of the detection device and the accuracy of signal detection. This is very important for optimizing the performance of the detection system. Especially in the coated area, the enhancement of the magnetic flux can ensure more stable signal transmission and improve the overall detection effect.

[0030] To accurately test and analyze the induced signal, it is also necessary to ensure a high degree of consistency in the relative position of the induction coil and the test coil in each detection during testing and data analysis.

[0031] To ensure more reliable and consistent results during the test, it is first necessary to ensure that the distance, overlap state, and relative position height between the test coil and the embedded induction coil are the same in each test. If the position deviation of these two coils is too large during the test, it will lead to deviation in the measurement results and cannot accurately reflect the aging situation of the coating and the change of the physical parameters of the coil. Therefore, ensuring the consistency of the coil position is to obtain reliable data.

[0032] To achieve this goal, various technical means can be adopted. Among them, the simplest method is to use regions, that is, to physically mark the relative positions of the induction coil and the test coil in the test environment or delimit a clear test area. One method is easy to implement and can help operators place the coils in the same position during each test in a certain programming, ensuring the distance and overlap state of the coils.

[0033] However, the method of region identification may have limitations in a test field with high-precision requirements. To improve the test accuracy, more advanced optical three-dimensional positioning technology can be introduced. The optical three-dimensional positioning system uses lasers, cameras or other precision optical devices to monitor and locate the relative positions of the test coil and the induction coil of the buried chip in real time. Through high-precision three-dimensional coordinate measurement, the overlapping area and spacing of the coils can be accurately controlled, thus ensuring the overlapping area and spacing of each coil.

[0034] In addition, when the detection data in the early stage is mature and can fully express the corresponding relationship between the aging curve of the surface coating and the test waveform data, the model of the test signal waveform can be further solidified to establish a stable reference model. It can effectively monitor the aging of the coil coating in different corrosion environments.

[0035] Specifically, using the solidified waveform model, the aging degree of the current behavior can be judged by measuring the bit error rate (BER) under different signal-to-noise ratio (SNR) conditions in actual tests. The bit error rate is an important parameter for the quality of the reflected signal. As the coating ages and physical parameters change, the signal defects of the coil may be affected, resulting in an increase in the bit error rate. Therefore, by monitoring the change of the bit error rate, the real-time state of the coating can be sensitively captured.

[0036] To simplify the detection process, a threshold of the bit error rate can be set. When the bit error rate exceeds this threshold, it can be qualitatively judged that the coating has reached a certain degree of aging. This threshold can be set according to the results of the previous test data and the aging curve model to ensure that it can accurately reflect the performance degradation of the coating.

[0037] This solution brings great convenience to daily inspections and frequent detection tasks. By real-time monitoring the bit error rate and signal waveform, the detection personnel can quickly evaluate the health status of the coating, simplify complex data processing and analysis steps. This not only improves the detection efficiency, but also provides early warnings, timely discovers potential aging problems, and first provides guiding opinions for maintenance and repair work. At the same time, this method can also reduce the need for over-detection and extend the service life of the equipment.

[0038] This aging detection method based on signal waveform and bit error rate analysis provides an effective and accurate tool for the long-term health monitoring of devices and has broad application prospects in the detection of NFC antenna coatings in a statistical environment.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coating aging detection method based on electrically coupled antenna technology, characterized in that: The invention comprises an NFC pre-embedded circuit structure, wherein the NFC pre-embedded circuit structure comprises an induction coil layer (3), the upper layer of the induction coil layer (3) is coated with a first adhesive layer (2), the upper part of the first adhesive layer (2) is provided with a protective coating (1), the bottom of the induction coil layer (3) is provided with a high magnetic permeability material layer (4), the lower layer of the high magnetic permeability material layer (4) is coated with a second adhesive layer (5), and the lower part of the second adhesive layer (5) is provided with a base layer (6).

2. The coating aging detection method based on electrically coupled antenna technology according to claim 1 is characterized in that: The induction coil layer (3) comprises an NFC chip (301), a filter circuit (302), a matching circuit (303) and an induction coil (304); The NFC chip (301) is connected to an antenna; The induction coil (304) is used to communicate with an external device through electromagnetic induction; The filter circuit (302) is used to adjust the parameters of the induction coil (304).

3. The coating aging detection method based on electrically coupled antenna technology according to claim 1 is characterized in that: The high magnetic permeability material layer (4) is used to deal with eddy current interference that may be caused by the metal base layer to the electromagnetic coupling signal. When the electromagnetic field contacts the metal material, the metal will produce an eddy current effect, thereby weakening the transmission and accuracy of the signal. In order to avoid this problem, the high magnetic permeability material layer (4) can effectively guide and concentrate the magnetic field, preventing the eddy current generated by the metal base layer from interfering with the coupling signal.

4. The coating aging detection method based on electrically coupled antenna technology according to claim 1 is characterized in that: The high magnetic permeability material layer (4) is also used to enhance the magnetic flux of the circuit. By increasing the magnetic flux, the induced signal becomes stronger and more obvious, thereby improving the sensitivity of the detection equipment and the accuracy of signal detection.

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