An atmospheric corrosion thin liquid film experimental device and experimental method of an energized metal conductor

Abstract

The application discloses an experimental device and experimental method for atmospheric corrosion thin liquid film of electrified metal conductor, which comprises a thin liquid film system, a three-electrode system, a constant temperature system and a constant current power supply system; the thin liquid film system provides a corrosion experimental thin liquid film environment for the metal conductor and comprises a container containing an electrolyte solution and a thin liquid film medium wrapping the three-electrode system, the thin liquid film medium extending into the electrolyte solution; the three-electrode system comprises the electrified metal conductor as a working electrode, a reference electrode and a counter electrode; the metal conductor is horizontally fixed through a support, passes through a container of a circulating water device and is connected with the constant temperature system and the constant current power supply system at both ends; the constant temperature system is a circulating water device introduced at both ends of the electrified metal conductor, so that the working electrode realizes a required temperature working condition; and the constant current power supply system supplies power for the metal conductor and provides a required constant current passing through the metal conductor.

Description

Technical Field

[0001] This invention specifically relates to an experimental apparatus and method for atmospheric corrosion thin liquid film testing of an energized metal conductor, belonging to the field of electrochemical testing technology. Background Technology

[0002] Currently, long-distance power transmission is mainly achieved through bare wire transmission. In the transmission network, exposed aluminum or aluminum alloy conductors operate in the atmospheric environment. Besides being affected by atmospheric temperature, humidity, and pollutants, they are also affected by the electric and magnetic fields generated during transmission. The corrosion of transmission and transformation equipment caused by electromagnetic fields in the power industry has attracted attention, and corrosion damage to transmission equipment due to electromagnetic fields is increasingly common. As a typical service environment for power equipment, the impact of electromagnetic fields on the atmospheric corrosion of metallic materials differs from many traditional factors. Related studies have shown that electric fields and current environments can accelerate metal corrosion. However, most existing research focuses on the corrosion mechanisms of metals under atmospheric conditions, and further research on atmospheric corrosion of metals under current-carrying conditions and experimental methods is urgently needed. Therefore, further research on the impact of electromagnetic field environments on atmospheric corrosion of metals under energized conditions and experimental methods is of great significance for improving the corrosion resistance and selection of conductor metal materials.

[0003] In power transmission and transformation systems, current flows through metal conductors during service. The strong electric and magnetic fields generated on the conductor surface due to this current significantly influence the corrosion of the conductor metal. Atmospheric corrosion testing commonly employs salt spray testing and electrochemical measurement methods. Electrochemical measurement offers advantages such as speed and effectiveness, not only obtaining the corrosion rate of metallic materials in the atmosphere but also allowing for in-depth research into the kinetic mechanisms of atmospheric corrosion. Electrochemical measurements of atmospheric corrosion often utilize thin-film electrolyte devices. By obtaining an electrolyte film of a certain thickness on the surface of the metal electrode and establishing a three-electrode system, the kinetics of the initial corrosion process of metals in the atmospheric environment can be studied.

[0004] Currently, commonly used thin-film electrochemical (TFT) devices cannot meet the requirements for studying atmospheric corrosion of metals under energized conditions. The main reasons are: 1. The electrodes in TFT devices cannot achieve uniform current flow through them; 2. The formation of the liquid film in TFT systems requires a relatively high environmental condition, typically a flat electrode surface. However, when current flows through a flat, bulk electrode, the electromagnetic field distribution on the electrode surface is uneven, making it impossible to measure different electromagnetic field levels; 3. Under high current, the metal generates heat, requiring cooling to ensure the electrodes remain at a predetermined temperature for research. Therefore, a device and method suitable for TFT experiments on atmospheric corrosion of metal conductors under energized conditions are needed to achieve the study of atmospheric corrosion of metals. Summary of the Invention

[0005] The purpose of this invention is to provide an experimental apparatus and method for atmospheric corrosion thin liquid film testing of current-carrying metal conductors. A thin liquid film device that meets the service conditions of current-carrying conductors is constructed, which can perform electrochemical measurements of atmospheric corrosion thin liquid film under different environmental level parameters for current-carrying metal conductors under various service conditions.

[0006] The technical solution of the present invention is as follows:

[0007] This invention provides an experimental apparatus for atmospheric corrosion thin-film corrosion of an energized metal conductor, comprising a thin-film system, a three-electrode system, a constant temperature system, and a constant current power supply system. The thin-film system provides a thin-film environment for corrosion experiments on the metal conductor, including a container filled with an electrolyte solution and a thin-film medium surrounding the three-electrode system, the thin-film medium extending into the electrolyte solution. The three-electrode system includes an energized metal conductor serving as the working electrode, a reference electrode, and a counter electrode. The metal conductor is horizontally fixed by a support, passes through a container of a circulating water device, and is connected at both ends to the constant temperature system and the constant current power supply system. The constant temperature system is a circulating water device introduced at both ends of the energized metal conductor, enabling the working electrode to achieve the required temperature conditions. The constant current power supply system supplies power to the metal conductor, providing the constant current required to pass through it.

[0008] Furthermore, platinum wire and silver wire covered with AgCl are wound around the surface of the metal conductor, respectively. The platinum wire is connected to the counter electrode of the potentiostat as the counter electrode; the silver wire covered with AgCl is connected to the reference electrode of the potentiostat as the reference electrode; the metal conductor is led out through a wire and connected to the working electrode of the potentiostat; an insulating film is coated at the contact points between the surface of the metal conductor and the wound platinum wire and the silver wire covered with AgCl.

[0009] Furthermore, the thin liquid film medium is a porous thin film carrier that extends into the electrolyte solution.

[0010] Furthermore, the constant temperature system includes a cooling pipe fixed to the outside of the metal conductor, which is connected to the outlet of the constant temperature bath to regulate the temperature of the circulating water.

[0011] Furthermore, the container containing the electrolyte solution has several small holes on its side wall, which are connected to the atmosphere.

[0012] The present invention also provides a method for conducting atmospheric corrosion thin liquid film experiments on energized metal conductors using the above-described apparatus.

[0013] Furthermore, the atmospheric corrosion thin liquid film test method for the current-carrying metallic conductor includes the following steps:

[0014] (1) Collect data on the service conditions of energized metal conductors;

[0015] (2) Prepare a metal conductor sample, apply an insulating film to the winding position of the reference electrode and the counter electrode and dry it, fix cooling tubes at both ends of the metal conductor, connect a constant temperature bath to the outside of the cooling tubes, fix the metal conductor horizontally on the support, and fix the container of electrolyte solution on the metal conductor at the same time.

[0016] (3) After grinding, polishing and cleaning the surface of the metal conductor, wrap the platinum wire and the silver wire covered with AgCl around the corresponding position of the insulating film. The platinum wire, the silver wire covered with AgCl and the metal conductor are led out through their respective leads and passed through the container to be connected to the counter electrode, reference electrode and working electrode of the potentiostat respectively. At the same time, connect the wires at both ends of the metal conductor to the two poles of the constant current power supply system.

[0017] (4) After the experiment begins, adjust the constant current power supply system according to the service conditions so that the current passes through the metal conductor and the cooling pipe is circulated with water. Monitor the surface temperature of the metal conductor in real time and control the temperature of the circulating water entering the cooling pipe through the temperature control system of the constant temperature bath.

[0018] (5) Inject the electrolyte solution into the bottom of the container, wrap a thin liquid film medium around the metal conductor and extend it into the electrolyte solution so that the electrolyte solution fills the thin liquid film medium;

[0019] (6) Turn on the potentiostat and measure the open circuit potential as needed. Once it stabilizes, electrochemical measurements can be performed.

[0020] (7) After the experiment, turn off the constant current power supply system and the constant temperature bath. The corrosion rate and corrosion process kinetic parameters of the metal conductor under the power-on condition can be obtained by analyzing the electrochemical data.

[0021] Furthermore, the collected service conditions include the service atmospheric environment, temperature, pollutant levels, and the magnitude of the current passing through the metal conductors.

[0022] Furthermore, when preparing a metal conductor sample, the diameter of the metal conductor needs to be determined based on the magnitude of the current or the intensity of the electromagnetic field under operating conditions.

[0023] Furthermore, the current supplied by the constant current power supply system is set according to the service conditions of the metal conductor, including AC and DC, with a current range of 0~500A.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. The atmospheric corrosion thin liquid film experimental device for an energized metal conductor provided by the present invention satisfies the thin liquid film experiment under the service conditions of an energized conductor. The wires at both ends of the metal conductor are connected to the two poles of a constant current power supply system. The constant current power supply system provides the metal conductor with the required constant current, which enables the current to pass through the electrodes themselves uniformly. A thin liquid film device that satisfies the service conditions of an energized conductor is constructed.

[0026] 2. In the experimental apparatus of the present invention, a circulating water device is introduced at both ends of the metal conductor to adjust the temperature of the circulating water. Through the thermal conductivity of the metal conductor, the metal conductor, which serves as the working electrode, achieves the required temperature conditions, avoiding the phenomenon of heat generation in the metal due to the current passing through it, and ensuring that the electrode is studied at a predetermined temperature.

[0027] 3. This invention provides a thin liquid film system for metal conductors, ensuring a constant temperature around the three-electrode system and thus ensuring the stability of the liquid film. At the same time, a porous thin film carrier is wrapped around the outside of the metal conductor and extended into the electrolyte solution. This ensures that the solution fills the porous thin film carrier through capillary action, overcoming the inability to meet the measurement requirements of different electromagnetic field levels due to uneven electrode surfaces. It enables the electrochemical measurement of atmospheric corrosion of energized metal conductors under different service conditions and environmental parameters. Attached Figure Description

[0028] Figure 1 This invention provides an experimental apparatus for atmospheric corrosion of thin liquid films on energized metallic conductors.

[0029] Figure 2 The polarization curves of metallic aluminum under different thicknesses of thin liquid films under the same DC current in Example 3 are shown.

[0030] Figure 3 The corrosion current density of metallic aluminum under different thin liquid film thicknesses in Example 3;

[0031] Figure 4 The polarization curves of aluminum under the same thin liquid film thickness at different currents in Example 3 are shown.

[0032] Figure 5 The corrosion current density of metallic aluminum under different current thin liquid films in Example 3;

[0033] Figure 6 The graph shows the impedance spectrum response of aluminum under the same current as the thickness of the thin liquid film in Example 3.

[0034] Figure 7 This is the equivalent circuit used for fitting the electrochemical impedance spectroscopy of aluminum under atmospheric corrosion in Example 3 under the action of current;

[0035] Figure 8The relationship between the fitting parameter Rct of aluminum under energized conditions and the thickness of the liquid film in Example 3 is shown.

[0036] Figure 9 This is a graph showing the impedance spectrum response of aluminum as a function of current under the same thin liquid film thickness in Example 3.

[0037] Figure 10 This shows the relationship between the fitting parameters of aluminum under thin liquid film conditions and the change of current in Example 3.

[0038] The markings in the attached diagram are as follows:

[0039] 1. Insulating film; 2. Thin liquid film medium; 3. Container; 4. Electrolyte solution; 5. Cooling pipe; 6. Constant current power supply; 7. Support; 8. Metal conductor; 9. Working electrode; 10. Counter electrode; 11. Reference electrode. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments. The embodiments given are only for illustrating the present invention and are not intended to limit the scope of the present invention.

[0041] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.

[0042] Example 1

[0043] See Figure 1This embodiment is an experimental apparatus for atmospheric corrosion of a current-carrying metal conductor using a thin-film liquid coating, comprising a thin-film liquid coating system, a three-electrode system, a constant temperature system, and a constant current power supply system. The thin-film liquid coating system provides a thin-film environment for corrosion experiments on the metal conductor 8, including a container 3 containing an electrolyte solution 4 and a thin-film liquid coating medium 2 surrounding the three-electrode system. The thin-film liquid coating medium 2 extends into the electrolyte solution 4. In this embodiment, the thin-film liquid coating medium 2 is a porous thin-film carrier, and the area surrounding the three-electrode system involves the exposed area of ​​the reference electrode 11, the counter electrode 10, and the metal conductor 8. In addition to the porous thin-film carrier described in this embodiment, other carrier materials with capillary function can also be selected for the thin-film liquid coating medium 2. In this embodiment, using the container 3 to surround the three-electrode system can ensure a constant temperature around the three-electrode system, while also ensuring the stability of the current-carrying metal conductor 8. The stability of the electrolyte solution 4 is unaffected by external environmental factors. The container 3 has several small holes on its sidewall, allowing it to communicate with the atmosphere. The three-electrode system includes a current-carrying metal conductor 8 (working electrode 9), a reference electrode 11, and a counter electrode 10. The metal conductor 8 is horizontally fixed by a support 7, passes through the container 3, and is connected at both ends to a constant temperature system and a constant current power supply system. The constant temperature system is a circulating water device introduced at both ends of the current-carrying metal conductor 8, enabling the working electrode 9 to achieve the required temperature conditions. In this embodiment, the constant temperature system includes cooling pipes 5 fixed to the outside of the metal conductor 8. The cooling pipes 5 are located at both ends of the container 3 and connected to the outlet of an external constant temperature bath to regulate the circulating water temperature. The constant current power supply system is a constant current power supply 6 connected externally to both ends of the metal conductor 8 via leads, providing the required constant current to the metal conductor 8.

[0044] In this embodiment, platinum wire and silver wire with silver chloride coating are wound around the surface of the metal conductor 8. The platinum wire is connected to the counter electrode of the potentiostat as the counter electrode 10. The silver wire covered with AgCl is connected to the reference electrode of the potentiostat as the reference electrode 11. The metal conductor 8 is led out through a wire and connected to the working electrode of the potentiostat as the working electrode 9. An insulating film 1 is coated at the contact points between the surface of the metal conductor 8 and the wound platinum wire and the silver wire covered with AgCl.

[0045] Example 2

[0046] This embodiment provides an experimental method for atmospheric corrosion of thin liquid films on current-carrying metallic conductors, including the following steps:

[0047] (1) Collect the service conditions of the energized metal conductor 8, including the service atmospheric environment, temperature, pollutant level and the magnitude of the current passing through the metal conductor;

[0048] (2) Prepare a metal conductor 8 sample. In this embodiment, the metal conductor 8 sample is a cylindrical rod. Its diameter needs to be determined according to the current or the electromagnetic field strength under the working condition. Apply an insulating film 1 to the winding position of the reference electrode 11 and the counter electrode 10 and dry it. Fix cooling pipes 5 at both ends of the metal conductor 8. The cooling pipes 5 are connected to a constant temperature bath. Fix the metal conductor 8 horizontally on the support 7. At the same time, fix the container 3 on the metal conductor 8.

[0049] (3) After grinding, polishing and cleaning the surface of the metal conductor 8, the platinum wire and the silver wire covered with AgCl are wound around the corresponding positions of the insulating film 1. The leads of each wire are led out through the container 3 and connected to the counter electrode and reference electrode of the potentiostat respectively to serve as the counter electrode 10 and reference electrode 11 of the three-electrode system. The metal conductor 8 is also connected to the working electrode of the potentiostat to serve as the working electrode 9 of the three-electrode system. The wires at both ends of the metal conductor 8 are connected to the two poles of the constant current power supply system.

[0050] (4) After the experiment begins, adjust the constant current power supply system according to the service conditions so that the current passes through the metal conductor 8. The current provided includes AC and DC, and the current range is 0~500A. Circulating water is circulated in the cooling pipe 5. The surface temperature of the metal conductor 8 is monitored in real time by an infrared thermometer and the circulating water entering the cooling pipe 5 is controlled by the temperature control system of the constant temperature bath.

[0051] (5) Inject electrolyte solution 4 into the bottom of container 3, wrap thin liquid film medium 2 around metal conductor 8 and extend it into electrolyte solution 4, so that electrolyte solution 4 is filled with thin liquid film medium 2;

[0052] (6) Turn on the potentiostat and measure the open circuit potential as needed. Once stable, electrochemical measurements can be performed, including polarization curve and / or electrochemical impedance spectroscopy measurements.

[0053] (7) After the experiment, turn off the constant current power supply system and the constant temperature bath. The corrosion rate and corrosion process kinetic parameters of the metal conductor under the power-on condition can be obtained by analyzing the electrochemical data.

[0054] Example 3

[0055] In this embodiment, 1050 aluminum alloy was selected as the metal conductor to study the corrosion characteristics of atmospheric corrosion under energized conditions; the composition of 1050 aluminum alloy as the metal conductor is shown in Table 1.

[0056] Table 11050 Aluminum Alloy Chemical Composition (wt%)

[0057]

[0058] The reference electrode uses a silver wire coated with AgCl. First, the silver wire is placed in acetone to remove oil, then etched with 1 mol / L HNO3, washed with distilled water, and then oxidized in 0.1 mol / L HCl. A three-electrode system is constructed, with the silver wire as the working electrode, calomel as the reference electrode, and a graphite plate as the counter electrode. The parameters are set using the chronoamperometry method: voltage 0.1V, time 2h. After removal, the potential is compared with that of a saturated calomel electrode. A potential difference of about 35mV indicates that the fabrication is complete. The fabricated silver wire coated with AgCl is stored in KCl solution in the dark for later use.

[0059] A set of 1050 aluminum alloy samples were machined into aluminum rods with a diameter of 4 mm and a length of 50 cm to serve as the metal conductors for the thin liquid film experiment. Before the experiment, each sample was polished step by step with SiC sandpaper of 400#-2000#, cleaned with deionized water, rinsed with alcohol to remove moisture, and finally dried with a hair dryer for later use. The electrolyte solution was a 0.35% NaCl solution, prepared with analytical grade sodium chloride and deionized water. The DC current passing through the aluminum rods was controlled to be 0, 10, 20, 30, 40, and 57 A, and the thickness of the thin liquid film was controlled to be 20 μm, 40 μm, 60 μm, 80 μm, and 100 μm. Electrochemical tests were performed using the experimental setup of Example 1 and the experimental method of Example 2, mainly including open circuit potential testing, polarization curves, and AC impedance testing. After the experiment, the electrochemical data were analyzed, and the specific results are as follows.

[0060] See Figure 2 and Figure 3 The figures show the polarization curves and fitted corrosion current density results of 1050 aluminum rods under thin liquid films of different thicknesses. The polarization curve results indicate that the thickness of the liquid film has a significant impact on the corrosion current density. Under the same current, as the thickness of the liquid film decreases, the corrosion current density gradually increases, which promotes the corrosion of aluminum.

[0061] See Figure 4 and Figure 5 When the thin liquid film is 60μm, the polarization curves and fitted corrosion current density diagrams of 1050 aluminum rods under different currents show that with the introduction of current, the open circuit potential shifts negatively to a certain extent, in the range of about 5~10mV. Figure 4 The results show that as the introduced DC current increases, the corrosion current density of the 1050 aluminum rod increases, and the corrosion rate of the 1050 aluminum rod on the surface accelerates.

[0062] See Figure 6 The impedance spectra of a 1050 aluminum rod under the same current and different thin film thicknesses are shown. Based on the characteristics of aluminum impedance spectra, the following methods were used... Figure 7 The equivalent circuit is fitted, where R s R is the resistance of the solution.surf R is the film resistance of the aluminum surface oxide, Q is a constant phase angle element, and its physical meaning is the interfacial capacitance between the solution and the electrode. ct C is the charge transfer resistance during an electrochemical reaction. dl This refers to the double-layer capacitance during the electrochemical reaction process; Table 2 shows the capacitance obtained using... Figure 7 The fitting parameters of the equivalent circuit shown are obtained after fitting.

[0063] Table 2 Fitting parameters of electrochemical impedance spectroscopy for atmospheric corrosion of aluminum under energized current.

[0064]

[0065] For the fitting parameters in Table 2, R ct Drawing, such as Figure 8 First, as can be seen from the table, the film resistance R surf R gradually increases with the increase of the thin liquid film thickness; surf The magnitude of the value represents the protective effect of the corrosion product film on the electrode surface. This indicates that as the thickness of the thin liquid film increases, the protective effect of the corrosion product film under energization is better, and the aluminum substrate is less susceptible to corrosion by the corrosive medium. Under energized conditions, the charge transfer resistance R... ct The corrosion rate of metallic aluminum increases with increasing thin liquid film thickness, and R... ct Inversely proportional, meaning that the corrosion rate of aluminum gradually decreases as the thickness of the liquid film increases.

[0066] To investigate the effect of different currents on the corrosion behavior of metallic aluminum under the same thin liquid film, electrochemical impedance spectroscopy was also performed. (See [link to relevant documentation]). Figure 9 The impedance spectra of a 1050 aluminum rod passing through it with different currents when the thin liquid film thickness is 20 μm are shown. Based on the characteristic impedance spectra of aluminum, the following methods were used... Figure 7 The equivalent circuit is fitted, where R s R is the resistance of the solution. surf R is the film resistance of the aluminum surface oxide, Q is a constant phase angle element, and its physical meaning is the interfacial capacitance between the solution and the electrode. ct C is the charge transfer resistance during an electrochemical reaction. dl This refers to the double-layer capacitance during the electrochemical reaction process; Table 3 shows the capacitance obtained using... Figure 7 The fitting parameters of the equivalent circuit shown are obtained after fitting.

[0067] Table 3 Fitting parameters of electrochemical impedance spectroscopy for atmospheric corrosion of aluminum under energized current.

[0068]

[0069] As can be seen from Table 3, the film resistance R surf R gradually decreases as the thickness of the thin liquid film increases;surf The size of the value indicates the protective effect of the corrosion product film on the electrode surface. It shows that as the current gradually increases, the morphology of the corrosion products gradually becomes loose and porous, and gradually evolves from dense corrosion products to corrosion products with gaps.

[0070] For the fitting parameters R in Table 3 ct Drawing, such as Figure 10 ;R ct It reflects the suppression of charge transfer processes and can also be used to assess the corrosion rate of metals; under energized conditions, the charge transfer resistance R... ct The corrosion rate of metallic aluminum decreases with increasing current and R... ct Inversely proportional, meaning that the corrosion rate of aluminum gradually decreases as the energizing current increases, and compared to no energizing current, R... ct The decrease indicates that the corrosion rate of aluminum is related to the magnitude of the current, and the applied current does indeed affect the corrosion of aluminum.

[0071] In conclusion, the results of the thin liquid film device simulating atmospheric corrosion of an energized conductor, as demonstrated in this embodiment, are quite accurate and closely resemble actual working conditions.

[0072] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An experimental apparatus for atmospheric corrosion of a thin liquid film on an energized metallic conductor, characterized in that: The system comprises a thin-film liquid system, a three-electrode system, a constant-temperature system, and a constant-current power supply system. The thin-film liquid system provides a thin-film environment for corrosion experiments on the metal conductor. It includes a container filled with an electrolyte solution and a thin-film medium surrounding the three-electrode system, extending into the electrolyte solution. The three-electrode system includes a current-carrying metal conductor as the working electrode, a reference electrode, and a counter electrode. The metal conductor is horizontally fixed by a support, passes through a container of a circulating water device, and its two ends are connected to the constant-temperature system and the constant-current power supply system. The constant-temperature system is a circulating water device introduced at both ends of the current-carrying metal conductor, enabling the working electrode to achieve the required temperature conditions. The constant-current power supply system supplies power to the metal conductor, providing a constant current required to pass through it. Platinum wire and silver wire covered with AgCl are wound around the surface of the metal conductor. The platinum wire is connected to the counter electrode of the potentiostat, serving as the counter electrode. The silver wire covered with AgCl is connected to the reference electrode of the potentiostat, serving as the reference electrode. The metal conductor is led out and connected to the working electrode of the potentiostat via a wire; the contact points between the surface of the metal conductor and the wound platinum wire and the silver wire covered with AgCl are coated with an insulating film; the thin liquid film medium is a porous thin film carrier that extends into the electrolyte solution; the constant temperature system includes a cooling pipe fixed to the outside of the metal conductor, the inlet of the cooling pipe being connected to the outlet of the constant temperature bath to regulate the temperature of the circulating water.

2. The experimental apparatus for atmospheric corrosion thin liquid film of an energized metal conductor according to claim 1, characterized in that: The container containing the electrolyte solution has several small holes on its side wall, which are connected to the atmosphere.

3. A method for testing atmospheric corrosion thin liquid films on current-carrying metallic conductors, characterized in that: The experiment was conducted using the atmospheric corrosion thin liquid film experimental apparatus for an energized metallic conductor as described in claim 1 or 2.

4. The atmospheric corrosion thin liquid film test method for an energized metallic conductor according to claim 3, characterized in that: Includes the following steps: (1) Collect data on the service conditions of energized metal conductors; (2) Prepare a metal conductor sample, apply an insulating film to the winding position of the reference electrode and the counter electrode and dry it, fix cooling tubes at both ends of the metal conductor, connect a constant temperature bath to the outside of the cooling tubes, fix the metal conductor horizontally on the support, and fix the container of electrolyte solution on the metal conductor at the same time. (3) After grinding, polishing and cleaning the surface of the metal conductor, wrap the platinum wire and the silver wire covered with AgCl around the corresponding position of the insulating film. The platinum wire, the silver wire covered with AgCl and the metal conductor are led out through their respective leads and passed through the container to be connected to the counter electrode, reference electrode and working electrode of the potentiostat respectively. At the same time, connect the wires at both ends of the metal conductor to the two poles of the constant current power supply system. (4) After the experiment begins, adjust the constant current power supply system according to the service conditions so that the current passes through the metal conductor and the cooling pipe is circulated with water. Monitor the surface temperature of the metal conductor in real time and control the temperature of the circulating water entering the cooling pipe through the temperature control system of the constant temperature bath. (5) Inject the electrolyte solution into the bottom of the container, wrap a thin liquid film medium around the metal conductor and extend it into the electrolyte solution so that the electrolyte solution fills the thin liquid film medium; (6) Turn on the potentiostat and measure the open circuit potential as needed. Once it stabilizes, electrochemical measurements can be performed. (7) After the experiment, turn off the constant current power supply system and the constant temperature bath. The corrosion rate and corrosion process kinetic parameters of the metal conductor under the power-on condition can be obtained by analyzing the electrochemical data.

5. The atmospheric corrosion thin liquid film test method for an energized metallic conductor according to claim 4, characterized in that: The collected service conditions include the service atmospheric environment, temperature, pollutant levels, and the magnitude of the current passing through the metal conductors.

6. The atmospheric corrosion thin liquid film test method for an energized metallic conductor according to claim 4, characterized in that: When preparing a metal conductor sample, the diameter of the metal conductor needs to be determined based on the magnitude of the current or the intensity of the electromagnetic field under operating conditions.

7. The atmospheric corrosion thin liquid film test method for an energized metallic conductor according to claim 4, characterized in that: The current supplied by the constant current power supply system is set according to the service conditions of the metal conductor, including AC and DC, with a current range of 0~500A.

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