Metal corrosion measuring device

Abstract

The invention provides a metal corrosion measuring device, which comprises a first electrode module, a second electrode module and a processing module, and is characterized in that the processing module is used for processing a first electric signal of a first pair of comb-shaped interdigital electrodes and a second electric signal of a second pair of comb-shaped interdigital electrodes; to determine an electrochemical noise measurement and / or an electrochemical impedance spectroscopy measurement of metal corrosion; the processing module is also used for processing the third electric signal of the inert counter electrode, the fourth electric signal of the reference electrode and the fifth electric signal of the surface of the object to be measured so as to determine the electrochemical impedance spectroscopy measurement result of metal corrosion. The measuring device is simple in structure and easy to miniaturize and integrate, and the accuracy of a measuring result is improved. The measuring device can also adapt to different test scenes, and the accuracy and flexibility of the measuring device are further improved.

Description

Technical Field

[0001] This invention relates to the field of metal corrosion measurement technology, and in particular to a metal corrosion measurement device. Background Technology

[0002] During vehicle operation, due to prolonged exposure to complex and changing natural environments, the surfaces of vehicle parts are highly susceptible to varying degrees of corrosion. Corrosion analysis of different parts of the vehicle body is typically conducted using a suspended standard template. However, this traditional method of measuring vehicle body corrosion using a suspended standard template suffers from low accuracy and flexibility, and is limited in its applicability to specific testing scenarios. Summary of the Invention

[0003] This invention provides a metal corrosion measuring device to improve the testing flexibility of the measuring device and the accuracy of the measurement results.

[0004] According to one aspect of the present invention, a metal corrosion measuring device is provided, comprising: a first electrode module, a second electrode module, and a processing module;

[0005] The first electrode module includes a first pair of comb-shaped interdigitated electrodes and at least one second pair of comb-shaped interdigitated electrodes. The first pair of comb-shaped interdigitated electrodes is made of an inert material, and the second pair of comb-shaped interdigitated electrodes is made of the metal substrate to be tested. The first pair of comb-shaped interdigitated electrodes and the second pair of comb-shaped interdigitated electrodes are electrically connected to the processing module. The processing module is used to process the first electrical signal of the first pair of comb-shaped interdigitated electrodes and the second electrical signal of the second pair of comb-shaped interdigitated electrodes to determine a first measurement result of metal corrosion. The first measurement result includes electrochemical noise measurement results and / or electrochemical impedance spectroscopy measurement results.

[0006] The second electrode module includes an inert counter electrode, a reference electrode, and an electrolytic cell. A first hole is provided at the bottom of the electrolytic cell to allow communication between the electrolytic cell and the surface of the analyte. The inert counter electrode and the reference electrode are respectively inserted into the electrolytic cell and electrically connected to the processing module. The processing module further processes a third electrical signal from the inert counter electrode, a fourth electrical signal from the reference electrode, and a fifth electrical signal from the surface of the analyte to determine a second measurement result of metal corrosion, including an impedance spectroscopy measurement result.

[0007] Optionally, the first electrode module includes two pairs of second pairs of comb-shaped interdigital electrodes, wherein the two pairs of second pairs of comb-shaped interdigital electrodes are respectively arranged on both sides of the first pair of comb-shaped interdigital electrodes;

[0008] The processing module is used to process the first electrical signal and the second electrical signal of one pair of the second pair of comb-shaped interdigitated electrodes to determine the electrochemical noise measurement results of metal corrosion, and to process the first electrical signal and the second electrical signal of another pair of the second pair of comb-shaped interdigitated electrodes to determine the electrochemical impedance spectroscopy measurement results of metal corrosion.

[0009] Optionally, the metal corrosion measuring device further includes a first image sensing module and / or a temperature and humidity sensing module. The first image sensing module is used to acquire images of the first electrode module, and the temperature and humidity sensing module is used to detect the temperature and humidity of the environment where the first electrode module is located. The first image sensing module and the temperature and humidity sensing module are electrically connected to the processing module.

[0010] Optionally, the first electrode module further includes an insulating layer and an adhesive backing, the insulating layer being disposed between the comb-shaped interdigital electrodes and the adhesive backing, the comb-shaped interdigital electrodes including the first pair of comb-shaped interdigital electrodes and the second pair of comb-shaped interdigital electrodes.

[0011] Optionally, the top of the electrolytic cell is provided with a second hole, and the second electrode module further includes an external structure part, which is disposed on one side of the second hole and outside the electrolytic cell, and the external structure part is used to seal the second hole;

[0012] The second electrode module further includes a motor, which is used to control the distance between the inert counter electrode and the surface of the test object and the distance between the reference electrode and the surface of the test object;

[0013] The inert electrode is electrically connected to the first interface of the external structure through the second hole, and the reference electrode is connected to the second interface of the external structure through the second hole. The first interface and the second interface are respectively connected to the processing module.

[0014] Optionally, the inert counter electrode is a flexible inert counter electrode mesh, and the reference electrode is a graduated Luggin capillary reference electrode. The flexible inert counter electrode mesh is parallel to the bottom of the electrolytic cell, and the vertical projection of the Luggin capillary reference electrode on the bottom of the electrolytic cell is located at the center of the first hole. The Luggin capillary reference electrode does not contact the surface of the analyte.

[0015] Optionally, the inert counter electrode is an inert electrode sheet, and the reference electrode is a graduated Luggin capillary reference electrode. The vertical projections of the inert electrode sheet and the Luggin capillary reference electrode at the bottom of the electrolytic cell are on a straight line, and the vertical projection of the Luggin capillary reference electrode at the bottom of the electrolytic cell is not at the center of the first hole. Neither the inert electrode sheet nor the Luggin capillary reference electrode is in contact with the surface of the analyte.

[0016] Optionally, the electrolytic cell includes multiple frame-like structures, with a groove between two adjacent frame-like structures. The adjacent frame-like structures are interlocked at the groove positions, and a sealing strip is provided in the portion of the groove located on the inner wall of the electrolytic cell.

[0017] Optionally, a second image sensing module is provided on the inner wall of the electrolytic cell, and the second image sensing module is electrically connected to the processing module;

[0018] The second image sensing module is used to acquire position images of the inert electrode and the reference electrode.

[0019] Optionally, the processing module includes a preprocessing unit and a microprocessor, and the preprocessing module is electrically connected to the microprocessor;

[0020] The preprocessing unit includes an integrated electrochemical simulation front-end and a simulation multiplexer. The integrated electrochemical simulation front-end is connected to the simulation multiplexer and the microprocessor, respectively. The simulation multiplexer is connected to the first electrode module and the second electrode module, respectively.

[0021] The integrated electrochemical simulation front end is used to convert the first electrical signal, the second electrical signal, the third electrical signal, the fourth electrical signal, and the fifth electrical signal into digital signals, and transmit the digital signals to the microprocessor; the analog multiplexer is used, under the control of the microprocessor, to control the connection status between the electrodes in the first electrode module and the second electrode module and the integrated electrochemical simulation front end;

[0022] The microprocessor is used to process the digital signal to determine the first measurement result or the second measurement result;

[0023] Alternatively, the microprocessor is communicatively connected to a terminal, and the microprocessor processes the digital signal and transmits it to the terminal so that the terminal can determine the first measurement result or the second measurement result based on the processed digital signal.

[0024] The metal corrosion measurement device provided in this embodiment of the invention includes a first electrode module, a second electrode module, and a processing module. The processing module processes the first electrical signal from the first pair of comb-shaped interdigitated electrodes and the second electrical signal from the second pair of comb-shaped interdigitated electrodes to determine the electrochemical noise measurement results and / or electrochemical impedance spectroscopy measurement results of metal corrosion. The second electrode module includes an inert counter electrode, a reference electrode, and an electrolytic cell. A first hole is provided at the bottom of the electrolytic cell to enable communication between the electrolytic cell and the surface of the analyte. The inert counter electrode and the reference electrode are respectively inserted into the electrolytic cell. The processing module also processes the third electrical signal from the inert counter electrode, the fourth electrical signal from the reference electrode, and the fifth electrical signal from the surface of the analyte to determine the electrochemical impedance spectroscopy measurement results of metal corrosion. This measurement device uses interdigitated comb electrodes for electrochemical noise measurement and electrochemical impedance spectroscopy measurement, making the measurement device simple in structure, easy to miniaturize and integrate, and comparing the measurement results of the inert material interdigitated comb electrodes and the interdigitated comb electrodes of the metal to be tested, thereby improving the accuracy of the measurement results. The measuring device combines an electrolytic cell, an inert counter electrode, and a reference electrode, which can adapt to different testing scenarios and further improve the accuracy and flexibility of the measuring device.

[0025] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the module connection of a metal corrosion measuring device provided in an embodiment of the present invention;

[0028] Figure 2 This is an overall structural diagram of a metal corrosion measuring device provided in an embodiment of the present invention;

[0029] Figure 3 This is a partial structural diagram of an electrolytic cell provided in an embodiment of the present invention;

[0030] Figure 4 This is a structural diagram of a first electrode module provided in an embodiment of the present invention;

[0031] Figure 5 This is a structural diagram of a second electrode module provided in an embodiment of the present invention;

[0032] Figure 6 This is a structural diagram of another second electrode module provided in an embodiment of the present invention;

[0033] Figure 7 This is a structural diagram of another second electrode module provided in an embodiment of the present invention;

[0034] Figure 8 This is a partial structural diagram of another electrolytic cell provided in an embodiment of the present invention;

[0035] Figure 9 This is a schematic diagram of the module connection of another metal corrosion measuring device provided in an embodiment of the present invention. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] This invention provides a metal corrosion measuring device. Figure 1 This is a schematic diagram of the module connection of a metal corrosion measuring device provided in an embodiment of the present invention. Figure 2 This is an overall structural diagram of a metal corrosion measuring device provided in an embodiment of the present invention. Figure 3 This is a partial structural diagram of an electrolytic cell provided in an embodiment of the present invention, with reference to... Figures 1-3 The metal corrosion measuring device includes: a first electrode module 10, a second electrode module 20, and a processing module 30.

[0039] The first electrode module 10 includes a first pair of comb-shaped interdigitated electrodes 11 and at least one second pair of comb-shaped interdigitated electrodes 12. The first pair of comb-shaped interdigitated electrodes 11 is made of an inert material, and the second pair of comb-shaped interdigitated electrodes 12 is made of the metal substrate to be tested. The first pair of comb-shaped interdigitated electrodes 11 and the second pair of comb-shaped interdigitated electrodes 12 are electrically connected to the processing module 30, respectively. The processing module 30 is used to process the first electrical signal of the first pair of comb-shaped interdigitated electrodes 11 and the second electrical signal of the second pair of comb-shaped interdigitated electrodes 12 to determine the first measurement result of metal corrosion. The first measurement result includes the electrochemical noise measurement result and / or the electrochemical impedance spectroscopy measurement result.

[0040] The second electrode module includes an inert counter electrode 21, a reference electrode 22, and an electrolytic cell 23. The bottom of the electrolytic cell 23 is provided with a first hole 231, which is used to connect the electrolytic cell 23 with the surface of the analyte. The inert counter electrode 21 and the reference electrode 22 are respectively inserted into the electrolytic cell 23 and are electrically connected to the processing module 30. The processing module 30 is also used to process the third electrical signal of the inert counter electrode 21, the fourth electrical signal of the reference electrode 22, and the fifth electrical signal of the surface of the analyte to determine the second measurement result of metal corrosion. The second measurement result includes the electrochemical impedance spectroscopy measurement result.

[0041] Specifically, both the first pair of comb-shaped interdigital electrodes 11 and the second pair of comb-shaped interdigital electrodes 12 include a pair of working electrodes, i.e., two working electrodes. The width of the comb teeth of the first pair of comb-shaped interdigital electrodes 11 ranges from 0.01mm to 1mm, and the spacing between the comb teeth ranges from 0.01mm to 1mm. For example, both the width and spacing of the comb teeth of the first pair of comb-shaped interdigital electrodes 11 can be 0.1mm. For example, both the width and spacing of the comb teeth of the second pair of comb-shaped interdigital electrodes 12 can be 0.1mm. Optionally, the first electrical signal, the second electrical signal, the third electrical signal, the fourth electrical signal, and the fifth electrical signal can be current signals. The bottom of the electrolytic cell 23 has an adhesive backing, and a flexible elastic gasket is arranged around the first hole 231 at the bottom of the electrolytic cell 23 to facilitate close contact with the surface of the object to be measured, whether it is a flat or non-flat surface, thereby improving the accuracy of the measurement.

[0042] The processing module 30 applies voltages of different frequencies to the first electrode module 10. After the first pair of comb-shaped interdigital electrodes 11 senses the voltages of different frequencies, they feed back a first electrical signal to the processing module 30. After the second pair of comb-shaped interdigital electrodes 12 senses the voltages of different frequencies, they feed back a second electrical signal to the processing module 30. The processing module 30 processes the first and second electrical signals to determine the electrochemical noise measurement results and / or the electrochemical impedance spectroscopy measurement results. The method for determining the electrochemical noise measurement results and / or the electrochemical impedance spectroscopy measurement results is a conventional method and will not be described in detail here.

[0043] The processing module 30 applies voltages of different frequencies to the second electrode module 20. The inert counter electrode 21 senses these voltages and feeds back a third electrical signal to the processing module 30. The reference electrode 22 senses these voltages and feeds back a fourth electrical signal. The surface of the analyte senses these voltages and feeds back a fifth electrical signal. The processing module 30 processes these three signals to determine the electrochemical impedance spectroscopy measurement results. The fourth electrical signal from the reference electrode is transmitted to the processing module 30 via a voltage buffer, where it is amplified. A shielded cable is used to connect the analyte surface (with a damaged coating outside the second electrode module 20) to the processing module 30, allowing the fifth electrical signal to be transmitted. The shielded cable can be a twisted pair. If the damaged area is located in a harsh corrosive environment, such as outside a car, the connection point must be separated from the external corrosive environment using epoxy resin and an inert adhesive to avoid introducing errors.

[0044] It should be noted that the processing module 30 processes the first electrical signal of the first pair of comb-shaped interdigital electrodes 11 and the second electrical signal of the second pair of comb-shaped interdigital electrodes 12 to determine the first measurement result of metal corrosion, which may include, but is not limited to, the following two cases:

[0045] 1) The processing module 30 processes the first electrical signal and the second electrical signal to determine the first measurement result of metal corrosion.

[0046] 2) The processing module 30 transmits the first electrical signal and the second electrical signal to the terminal via a communication module such as Bluetooth. The terminal processes the first electrical signal and the second electrical signal to obtain the first measurement result.

[0047] The processing module 30 is also used to process the third electrical signal of the inert counter electrode 21, the fourth electrical signal of the reference electrode 22, and the fifth electrical signal of the surface of the analyte to determine a second measurement result of metal corrosion. The second measurement result includes electrochemical impedance spectroscopy measurement results, which may include, but are not limited to, the following two cases:

[0048] 1) The processing module 30 processes the third, fourth and fifth electrical signals to determine the second measurement result of metal corrosion.

[0049] 2) The processing module 30 transmits the third, fourth and fifth electrical signals to the terminal via a communication module such as Bluetooth. The terminal processes the third, fourth and fifth electrical signals to obtain the second measurement result.

[0050] The metal corrosion measuring device provided in this invention includes a first electrode module, a second electrode module, and a processing module. The processing module processes the first electrical signal from the first pair of comb-shaped interdigitated electrodes and the second electrical signal from the second pair of comb-shaped interdigitated electrodes to determine the electrochemical noise measurement results and / or electrochemical impedance spectroscopy measurement results of metal corrosion. The second electrode module includes an inert counter electrode, a reference electrode, and an electrolytic cell. A first hole is provided at the bottom of the electrolytic cell to enable communication between the electrolytic cell and the surface of the analyte. The inert counter electrode and the reference electrode are respectively inserted into the electrolytic cell. The processing module further processes the third electrical signal from the inert counter electrode, the fourth electrical signal from the reference electrode, and the fifth electrical signal from the surface of the analyte to determine the electrochemical impedance spectroscopy measurement results of metal corrosion. This measuring device uses interdigitated comb electrodes for electrochemical noise measurement and electrochemical impedance spectroscopy measurement, making the measuring device simple in structure, easy to miniaturize and integrate, and comparing the measurement results of the inert material interdigitated comb electrodes and the interdigitated comb electrodes of the metal to be tested, thus improving the accuracy of the measurement results. The measuring device combines an electrolytic cell, an inert counter electrode, and a reference electrode, which can adapt to different testing scenarios and further improve the accuracy and flexibility of the measuring device.

[0051] Figure 4 This is a structural diagram of a first electrode module provided in an embodiment of the present invention, with reference to... Figure 4 Optionally, the first electrode module 10 includes two pairs of second pairs of comb-shaped interdigital electrodes 12, wherein the two pairs of second pairs of comb-shaped interdigital electrodes 12 are respectively arranged on both sides of the first pair of comb-shaped interdigital electrodes 11.

[0052] The processing module 30 is used to process the first electrical signal and the second electrical signal of one of the second pairs of comb-shaped interdigitated electrodes to determine the electrochemical noise measurement results of metal corrosion, and to process the first electrical signal and the second electrical signal of another pair of second pairs of comb-shaped interdigitated electrodes to determine the electrochemical impedance spectroscopy measurement results of metal corrosion.

[0053] Specifically, the first pair of comb-shaped interdigital electrodes 11 and the two pairs of second comb-shaped interdigital electrodes 12 are exposed to the natural environment. The electrochemical noise measurement results of the first pair of comb-shaped interdigital electrodes 11 and the two pairs of second comb-shaped interdigital electrodes 12 reflect the comprehensive state changes of the natural environment, which include: condensed dew, air ions, rainwater, soil and dust, etc.

[0054] When the car is moving or stationary, the power module 60 supplies power to the processing module 30. The processing module 30 applies voltages of different frequencies to the first electrode module 10. The first pair of comb-shaped interdigital electrodes 11 senses these voltages and feeds back a first electrical signal to the processing module 30, and the second pair of comb-shaped interdigital electrodes 12 senses these voltages and feeds back a second electrical signal. The processing module 30 calculates the noise standard deviation of the first and second electrical signals based on the different frequency voltages, the first electrical signal from the first pair of comb-shaped interdigital electrodes 11, and the second electrical signal from the second pair of comb-shaped interdigital electrodes 12. The processing module 30 obtains the first electrical noise resistance based on the ratio of the voltage noise standard deviation to the first electrical signal noise standard deviation, and the second electrical noise resistance based on the ratio of the voltage noise standard deviation to the second electrical signal noise standard deviation. At the same time point, a significant increase in the noise standard deviation of the second electrical signal, which is greater than that of the first electrical signal, indicates that the corrosion of the test object's surface is intensified. Conversely, a decrease in the second electrical noise resistance, which is less than that of the first electrical noise resistance, indicates that the corrosion rate of the test object's surface is increasing.

[0055] The processing module 30 can also obtain curves showing the changes of voltage and second electrical signals over time based on voltages and second electrical signals at different frequencies. By analyzing the number and height of peaks exceeding thresholds on these curves, the module determines the extent of pitting corrosion on the surface of the object under test. The processing module 30 converts the fluctuations of voltage, second electrical signal, and second noise resistance over time into the frequency domain to obtain a power spectral density curve. A smaller slope in the power spectral density curve indicates uniform corrosion on the surface of the object under test, a larger slope indicates localized corrosion, and a zero slope indicates white noise.

[0056] When the car stops, the power module 60 supplies power to the processing module 30. The processing module 30 applies voltages of different frequencies to the first electrode module 10. After sensing the voltages of different frequencies, the first pair of comb-shaped interdigital electrodes 11 feeds back a first electrical signal with the voltage of different frequencies to the processing module 30. The second pair of comb-shaped interdigital electrodes 12 also feeds back a second electrical signal with the voltage of different frequencies to the processing module 30 after sensing the voltage of different frequencies. The processing module 30 processes the first and second electrical signals to obtain the electrochemical impedance spectroscopy characteristics of the combined effects of corrosion of the metal under test and corrosion from the natural environment. By analyzing the electrochemical impedance spectroscopy, the corrosion state and corrosion rate of the surface of the test object can be evaluated. The interdigital comb-shaped electrode has a simple structure, is easy to miniaturize and integrate, and improves the sensitivity to changes in temperature and humidity in the natural environment, further improving the accuracy of metal corrosion measurement on the surface of the test object.

[0057] Optional, see reference Figure 2 The metal corrosion measuring device also includes an image sensing module 40 and / or a temperature and humidity sensing module 50. The image sensing module 40 is used to acquire images of the first electrode module 10, and the temperature and humidity sensing module 50 is used to detect the temperature and humidity of the environment where the first electrode module 10 is located. The image sensing module 40 and the temperature and humidity sensing module 50 are electrically connected to the processing module.

[0058] Specifically, an image sensing module 40 is respectively installed near the first pair of comb-shaped interdigitated electrodes 11 and the two second pairs of comb-shaped interdigitated electrodes 12. This module is used to collect surface image data of the first pair of comb-shaped interdigitated electrodes 11 and the two second pairs of comb-shaped interdigitated electrodes 12. A temperature and humidity sensing module 50 is used to detect the temperature and humidity data of the environment where the first electrode module 10 is located. The electrode image data collected by the image sensing module 40 is transmitted to the processing module 30 via wires. The temperature and humidity data detected by the temperature and humidity sensing module 50 are also transmitted to the processing module 30 via wires. The processing module 30 can combine the first electrical signal, the second electrical signal, the electrode image data, the temperature data, and the humidity data to determine the corrosion status of the metal. The temperature and humidity sensing module 50 has adhesive backing, allowing it to adhere to the vicinity of the first pair of comb-shaped interdigitated electrodes 11 and the two second pairs of comb-shaped interdigitated electrodes 12.

[0059] Optionally, the first electrode module 10 further includes an insulating layer and an adhesive backing. The insulating layer is disposed between the comb-shaped interdigitated electrodes and the adhesive backing. The comb-shaped interdigitated electrodes include a first pair of comb-shaped interdigitated electrodes 11 and a second pair of comb-shaped interdigitated electrodes 12.

[0060] Specifically, an insulating layer and adhesive backing are provided on the first pair of comb-shaped interdigital electrodes 11 and the second pair of comb-shaped interdigital electrodes 12, so that the first electrode module 10 is firmly attached to the surface of the object to be tested, thereby improving the accuracy and flexibility of metal corrosion measurement.

[0061] Optional, Figure 5 This is a structural diagram of a second electrode module provided in an embodiment of the present invention, with reference to... Figure 5 The top of the electrolytic cell 23 is provided with a second hole. The second electrode module 20 also includes an external structure part 24, which is disposed on one side of the second hole and outside the electrolytic cell 23. The external structure part 24 is used to seal the second hole.

[0062] The second electrode module 20 also includes a motor, which is used to control the distance between the inert electrode 21 and the surface of the test object and the distance between the reference electrode 22 and the surface of the test object.

[0063] The inert electrode 21 is electrically connected to the first interface 241 of the external structure 24 through the second hole, and the reference electrode 22 is connected to the second interface 242 of the external structure 24 through the second hole. The first interface 241 and the second interface 242 are respectively connected to the processing module 30.

[0064] Specifically, the external structure 24 seals the second hole with damping silicone, and the second electrode module 20 includes two motors. One motor controls the distance between the inertial electrode 21 and the surface of the object to be measured, and the other motor controls the distance between the reference electrode 22 and the surface of the object to be measured.

[0065] The inert counter electrode 21 is electrically connected to the first interface 241 of the external structure 24 through the second hole. The third electrical signal output by the inert counter electrode 21 is transmitted to the processing module 30 through the wire connecting the first interface 241 and the processing module 30. The reference electrode 22 is connected to the second interface 242 of the external structure 24 through the second hole. The fourth electrical signal output by the reference electrode 22 is transmitted to the processing module 30 through the wire connecting the second interface 242 and the processing module 30, and is used for subsequent electrochemical impedance spectroscopy measurement.

[0066] Optional, Figure 6 This is a structural diagram of another second electrode module provided in an embodiment of the present invention, with reference to... Figure 6 The inert counter electrode 21 is a flexible inert counter electrode mesh, and the reference electrode 22 is a graduated Luggin capillary reference electrode. The flexible inert counter electrode mesh is parallel to the bottom of the electrolytic cell 23. The vertical projection of the Luggin capillary reference electrode on the bottom of the electrolytic cell 23 is located at the center of the first hole 231. The Luggin capillary reference electrode does not contact the surface of the analyte.

[0067] Specifically, the flexible inert counter electrode mesh is circular in shape and can recover after bending. The flexible inert counter electrode mesh can be a flexible platinum metal counter electrode mesh. The Luggin capillary is a salt bridge component used as a reference electrode. It is drawn into a capillary structure from a glass tube. Using the Luggin capillary and the reference electrode together can guide the measuring end of the reference electrode to a position close to the surface of the analyte through the tip of the Luggin capillary, thereby improving the measurement results of electrochemical impedance spectroscopy. The outer wall of the Luggin capillary reference electrode is set with a scale to facilitate the determination of the distance between the tip of the reference electrode and the surface of the analyte. When performing metal corrosion measurement, the distance between the tip of the Luggin capillary reference electrode and the surface of the analyte is in the range of 1mm-2mm. For example, the distance between the tip of the Luggin capillary reference electrode and the surface of the analyte can be 1mm, 1.5mm, and 2mm, etc.

[0068] The flexible inert electrode mesh is bendable. For example, when the surface of the object to be tested is in a gap, the flexible inert electrode mesh is parallel to the surface of the object to be tested; when the surface of the object to be tested is the two sides of an edge, the flexible inert electrode mesh is bent at the same angle as the edge, and the two sides of the flexible inert electrode mesh after bending are parallel to the two sides of the edge.

[0069] Electrolytic cell 23 is equipped with an electrolyte injection and suction port 235. When using a flexible inert electrode grid and a Luggin capillary reference electrode to measure metal corrosion, a thin tube is used to inject standard electrolyte into electrolytic cell 23 through the electrolyte injection and suction port 235. Electrolytic cell 23 is repeatedly rinsed with standard electrolyte and the used standard electrolyte is sucked out. Finally, unused standard electrolyte is injected. The standard electrolyte can be sucked out by a micro pump or manually.

[0070] Under the same electrolyte environment, the surface of the analyte at different time points is measured using a flexible inert counter electrode mesh and a Luggin capillary reference electrode. The processing module 30 processes the third electrical signal of the flexible inert counter electrode mesh, the fourth electrical signal of the Luggin capillary reference electrode, and the fifth electrical signal of the analyte surface to obtain an electrochemical impedance spectroscopy, and analyzes the changes of the analyte surface over time based on the electrochemical impedance spectroscopy.

[0071] Optional, Figure 7 This is a structural diagram of another second electrode module provided in an embodiment of the present invention, with reference to... Figure 7 The inert electrode 21 is an inert electrode sheet, and the reference electrode 22 is a graduated Luggin capillary reference electrode. The vertical projections of the inert electrode sheet and the Luggin capillary reference electrode at the bottom of the electrolytic cell 23 are on a straight line, and the vertical projection of the Luggin capillary reference electrode at the bottom of the electrolytic cell is not at the center of the first hole 231. Neither the inert electrode sheet nor the Luggin capillary reference electrode is in contact with the surface of the analyte.

[0072] Specifically, the vertical projections of the inert electrode and the Luggin capillary reference electrode at the bottom of the electrolytic cell 23 are aligned on a straight line, meaning they are placed side-by-side to facilitate the measurement of corrosion on the surface of the analyte within the crevices. The distance between the inert electrode and the analyte surface ranges from 1mm to 2mm, and the distance between the tip of the Luggin capillary reference electrode and the analyte surface also ranges from 1mm to 2mm. For example, the distances between the inert electrode and the analyte surface can be 1mm, 1.5mm, and 2mm, and the distances between the tip of the Luggin capillary reference electrode and the analyte surface can also be 1mm, 1.5mm, and 2mm. The electrolytic cell 23 is equipped with a latch 237. When the latch 237 is opened, the upper and lower parts of the electrolytic cell 23 can be opened, allowing for the replacement of the inert counter electrode 21 and the reference electrode 22.

[0073] When measuring the surface of the analyte in the slit using an inert electrode sheet and a Lugin capillary reference electrode, the electrolyte in the electrolytic cell 23 is the liquid naturally present in the slit, which includes condensed dew, air ions, rainwater, soil, and dust.

[0074] Using the liquid naturally retained in the gap at different time points, the processing module 30 processes the third electrical signal of the flexible inert electrode grid, the fourth electrical signal of the Lugin capillary reference electrode, and the fifth electrical signal of the surface of the analyte to obtain an electrochemical impedance spectrum and analyze the influence of each substance in the liquid naturally retained in the gap on the surface of the analyte.

[0075] Optional, Figure 8 This is a partial structural diagram of another electrolytic cell provided in an embodiment of the present invention, with reference to... Figure 8 The electrolytic cell includes multiple frame-shaped structures 233, with a groove 232 between two adjacent frame-shaped structures 233. The adjacent frame-shaped structures 233 are interlocked at the groove 232, and a sealing strip 234 is provided in the part of the groove located on the inner wall of the electrolytic cell.

[0076] Specifically, the frame structure 233 is made of a low surface energy material, such as polytetrafluoroethylene (PTFE). The frame structure 233 closest to the first cavity 231 is narrower than the others to accommodate larger shape variations in the electrolytic cell 23. Each frame structure 233 has a strip of adhesive at its bottom, allowing the electrolytic cell 23 to adhere to the surface of the object being tested. A groove 232 is provided between adjacent frame structures 233. When the surface of the object being tested is irregularly shaped, sliding the frame structure 233 allows the electrolytic cell 23 to fit more closely to the surface, improving the accuracy of metal corrosion measurement and enabling the metal corrosion measurement device to be applied to more testing scenarios. A sealing strip 234 is provided in the portion of the groove located on the inner wall of the electrolytic cell to prevent electrolyte leakage after the frame structure 233 slides. For example, the sealing strip 234 can be a damping silicone strip.

[0077] For example, when the surface of the object to be tested is in the gap, the frame structure 233 slides downward, and the flexible elastic gaskets around the first hole 231 seal the surface of the object to be tested, and then the surface of the object to be tested is measured; when the surface of the object to be tested is the two sides of an edge, the frame structure 233 slides upward, and the unslidable frame structure 233 fits against the two sides of the edge, making the electrolytic cell into an "L" shape, and the flexible elastic gaskets around the first hole 231 seal the surface of the object to be tested, and then the surface of the object to be tested is measured; when the surface of the object to be tested is a plane, the frame structure 233 does not slide, the electrolytic cell 23 maintains the cylindrical shape, the flexible elastic gaskets around the first hole 231 seal the surface of the object to be tested, and then the surface of the object to be tested is measured.

[0078] Optional, see reference Figure 3 A second image sensing module 235 is provided on the inner wall of the electrolytic cell 23, and the second image sensing module 235 is electrically connected to the processing module 30.

[0079] The second image sensing module 235 is used to acquire position images of the inert counter electrode 21 and the reference electrode 22.

[0080] Specifically, the electrolytic cell 23 also includes a third interface 236. The wires connect the second image sensing module 235 and the processing module 30 through the third interface 236 on the electrolytic cell 23. The position images of the inert counter electrode 21 and the reference electrode 22 acquired by the second image sensing module 235 are transmitted to the processing module 30 through the wires. The processing module 30 can obtain the positions of the inert counter electrode 21 and the reference electrode 22 in the electrolytic cell 23, as well as the distances between the inert counter electrode 21 and the reference electrode 22 and the surface of the object to be measured.

[0081] Figure 9 This is a schematic diagram of the module connection of another metal corrosion measuring device provided in an embodiment of the present invention, with reference to... Figure 9Optionally, the processing module 30 includes a preprocessing unit 31 and a microprocessor 32, and the preprocessing module is electrically connected to the microprocessor.

[0082] The preprocessing unit 31 includes an integrated electrochemical simulation front-end 311 and a simulation multiplexer 312. The integrated electrochemical simulation front-end 311 is connected to the simulation multiplexer 312 and the microprocessor 32, respectively. The simulation multiplexer 312 is connected to the first electrode module 10 and the second electrode module 20, respectively.

[0083] The integrated electrochemical simulation front-end 311 is used to convert the first electrical signal, the second electrical signal, the third electrical signal, the fourth electrical signal and the fifth electrical signal into digital signals, and transmit the digital signals to the microprocessor 32; the analog multiplexer 312 is used to control the connection status between the electrodes in the first electrode module 10 and the second electrode module 20 and the integrated electrochemical simulation front-end 311 under the control of the microprocessor 32.

[0084] The microprocessor 32 is used to process digital signals to determine a first measurement result or a second measurement result;

[0085] Alternatively, the microprocessor 32 is connected to the terminal for communication. The microprocessor 32 processes the digital signal and transmits it to the terminal so that the terminal can determine the first measurement result or the second measurement result based on the processed digital signal.

[0086] Specifically, the metal corrosion measurement device also includes a power supply module 60, which supplies power to the processing module 30. An integrated electrochemical simulation front-end 311 amplifies the first, second, third, fourth, and fifth electrical signals and converts them into digital signals. These digital signals are then transmitted to the microprocessor 32 for processing. The processed digital signals are transmitted to a terminal via Bluetooth, where they are analyzed to obtain electrochemical noise measurement results and electrochemical impedance measurement results. The microprocessor 32 can control the analog multiplexer 312 to select the electrodes to be connected for electrochemical noise and electrochemical impedance measurements. For example, the microprocessor can be an STM32H7 microprocessor, and the integrated electrochemical simulation front-end can be an ADuCM355 chip.

[0087] When the car is in motion or stationary and the same microprocessor 32 is used to measure the operating state of the car battery, the preprocessing unit 31 is replaced with the battery preprocessing unit. The battery preprocessing unit includes an isolated DC-DC power module 60, a digital isolator, an isolation amplifier, an analog-to-digital converter module, and a voltage-controlled power supply circuit. The isolated DC-DC power module 60 supplies power to the battery preprocessing module. Isolation is to prevent the high voltage of the battery under test from affecting the first electrode module 10 and the second electrode module 20. The digital isolator isolates the digital signal in the measurement of metal corrosion on the surface of the test object. The voltage-controlled power supply circuit generates the excitation current for the car battery. The small voltage signal of the car battery response is amplified by the isolation amplifier. The amplified voltage signal is converted into a voltage digital signal by the analog-to-digital converter module and transmitted to the microprocessor 32 for processing. This completes the periodic electrochemical impedance spectroscopy measurement of the operating state of the single cell of the vehicle battery and the operating state of various new types of batteries (vehicle solar panels, vehicle fiber energy storage composite materials, etc.).

[0088] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0089] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A metal corrosion measuring device, characterized in that, include: First electrode module, second electrode module, and processing module; The first electrode module includes a first pair of comb-shaped interdigitated electrodes and at least one second pair of comb-shaped interdigitated electrodes. The first pair of comb-shaped interdigitated electrodes is made of an inert material, and the second pair of comb-shaped interdigitated electrodes is made of the metal substrate to be tested. The first pair of comb-shaped interdigitated electrodes and the second pair of comb-shaped interdigitated electrodes are electrically connected to the processing module. The processing module is used to process the first electrical signal of the first pair of comb-shaped interdigitated electrodes and the second electrical signal of the second pair of comb-shaped interdigitated electrodes to determine a first measurement result of metal corrosion. The first measurement result includes electrochemical noise measurement results and / or electrochemical impedance spectroscopy measurement results. The second electrode module includes an inert counter electrode, a reference electrode, and an electrolytic cell. A first hole is provided at the bottom of the electrolytic cell to allow communication between the electrolytic cell and the surface of the analyte. The inert counter electrode and the reference electrode are respectively inserted into the electrolytic cell and electrically connected to the processing module. The processing module further processes a third electrical signal from the inert counter electrode, a fourth electrical signal from the reference electrode, and a fifth electrical signal from the surface of the analyte to determine a second measurement result of metal corrosion, including an impedance spectroscopy measurement result.

2. The metal corrosion measuring device according to claim 1, characterized in that, The first electrode module includes two pairs of second pairs of comb-shaped interdigital electrodes, wherein the two pairs of second pairs of comb-shaped interdigital electrodes are respectively arranged on both sides of the first pair of comb-shaped interdigital electrodes; The processing module is used to process the first electrical signal and the second electrical signal of one pair of the second pair of comb-shaped interdigitated electrodes to determine the electrochemical noise measurement results of metal corrosion, and to process the first electrical signal and the second electrical signal of another pair of the second pair of comb-shaped interdigitated electrodes to determine the electrochemical impedance spectroscopy measurement results of metal corrosion.

3. The metal corrosion measuring device according to claim 1 or 2, characterized in that, It also includes a first image sensing module and / or a temperature and humidity sensing module. The first image sensing module is used to acquire images of the first electrode module, and the temperature and humidity sensing module is used to detect the temperature and humidity of the environment where the first electrode module is located. The first image sensing module and the temperature and humidity sensing module are electrically connected to the processing module.

4. The metal corrosion measuring device according to claim 1 or 2, characterized in that, The first electrode module further includes an insulating layer and an adhesive backing. The insulating layer is disposed between the comb-shaped interdigital electrodes and the adhesive backing. The comb-shaped interdigital electrodes include the first pair of comb-shaped interdigital electrodes and the second pair of comb-shaped interdigital electrodes.

5. The metal corrosion measuring device according to claim 1, characterized in that, The top of the electrolytic cell is provided with a second hole, and the second electrode module also includes an external structure part, which is disposed on one side of the second hole and outside the electrolytic cell. The external structure part is used to seal the second hole. The second electrode module further includes a motor, which is used to control the distance between the inert counter electrode and the surface of the test object and the distance between the reference electrode and the surface of the test object; The inert electrode is electrically connected to the first interface of the external structure through the second hole, and the reference electrode is connected to the second interface of the external structure through the second hole. The first interface and the second interface are respectively connected to the processing module.

6. The metal corrosion measuring device according to claim 5, characterized in that, The inert counter electrode is a flexible inert counter electrode mesh, and the reference electrode is a graduated Luggin capillary reference electrode. The flexible inert counter electrode mesh is parallel to the bottom of the electrolytic cell, and the vertical projection of the Luggin capillary reference electrode on the bottom of the electrolytic cell is located at the center of the first hole. The Luggin capillary reference electrode does not contact the surface of the analyte.

7. The metal corrosion measuring device according to claim 5, characterized in that, The inert electrode is an inert electrode sheet, and the reference electrode is a graduated Luggin capillary reference electrode. The vertical projections of the inert electrode sheet and the Luggin capillary reference electrode at the bottom of the electrolytic cell are on a straight line, and the vertical projection of the Luggin capillary reference electrode at the bottom of the electrolytic cell is not at the center of the first hole. Neither the inert electrode sheet nor the Luggin capillary reference electrode is in contact with the surface of the analyte.

8. The metal corrosion measuring device according to claim 1, characterized in that, The electrolytic cell includes multiple frame-shaped structures, with a groove between two adjacent frame-shaped structures. The adjacent frame-shaped structures are interlocked at the groove positions, and a sealing strip is provided on the portion of the groove located on the inner wall of the electrolytic cell.

9. The metal corrosion measuring device according to claim 1, characterized in that, A second image sensing module is provided on the inner wall of the electrolytic cell, and the second image sensing module is electrically connected to the processing module; The second image sensing module is used to acquire position images of the inert electrode and the reference electrode.

10. The metal corrosion measuring device according to claim 1, characterized in that, The processing module includes a preprocessing unit and a microprocessor, and the preprocessing module is electrically connected to the microprocessor; The preprocessing unit includes an integrated electrochemical simulation front-end and a simulation multiplexer. The integrated electrochemical simulation front-end is connected to the simulation multiplexer and the microprocessor, respectively. The simulation multiplexer is connected to the first electrode module and the second electrode module, respectively. The integrated electrochemical simulation front end is used to convert the first electrical signal, the second electrical signal, the third electrical signal, the fourth electrical signal, and the fifth electrical signal into digital signals, and transmit the digital signals to the microprocessor; the analog multiplexer is used, under the control of the microprocessor, to control the connection status between the electrodes in the first electrode module and the second electrode module and the integrated electrochemical simulation front end; The microprocessor is used to process the digital signal to determine the first measurement result or the second measurement result; Alternatively, the microprocessor is communicatively connected to a terminal, and the microprocessor processes the digital signal and transmits it to the terminal so that the terminal can determine the first measurement result or the second measurement result based on the processed digital signal.

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