An electrochemical testing device and testing method suitable for high temperature inflation conditions

Abstract

The invention relates to an electrochemical testing device and a testing method suitable for high-temperature gas-filled conditions. The electrochemical testing device comprises an electrochemical component, a temperature control component, a gas-filled component and an electrochemical workstation. The electrochemical component comprises a reference electrode, an auxiliary electrode, a working electrode, a salt bridge, a first reaction tank and a second reaction tank. The auxiliary electrode and the working electrode are inserted in the first reaction tank, the reference electrode is inserted in the second reaction tank, and the two ends of the salt bridge are respectively inserted in the first reaction tank and the second reaction tank. The electrochemical workstation is connected with the working electrode and the reference electrode to form a measurement circuit. The electrochemical workstation is connected with the working electrode and the auxiliary electrode to form a polarization circuit. The electrochemical workstation avoids the gas-filled bubbles from affecting the stability of the electrochemical system, avoids the working electrode and the reference electrode from being affected under high temperature and high pressure environments, and ensures the accuracy of the test results. The electrochemical corrosion test of a metal sample is carried out under set temperature and pressure conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of electrochemical testing, and in particular relates to an electrochemical testing device and a testing method suitable for high-temperature gas-filled conditions. Background Art

[0002] At present, electrochemical testing technology is widely used in the field of material corrosion and protection research. However, most electrochemical tests are carried out at room temperature and pressure. In fact, for the petrochemical industry, the electrochemical corrosion process usually occurs at a temperature of 100°C to 200°C, and most corrosion processes involve corrosive gases such as CO2 and O2 and high-pressure environments underground. Therefore, it is particularly important to develop a device that can perform electrochemical testing in a high-temperature and inflatable high-pressure environment.

[0003] In the prior art, most electrochemical test devices under high-temperature aerated conditions can only complete electrochemical tests under high-temperature non-aerated conditions. In addition, the research on existing high-temperature aerated electrochemical test devices is mostly focused on the structural optimization of the reactor and the high-temperature stability of the electrochemical system, while the specific configuration and performance of the electrode system, the addition of corrosive gases, and the creation of a high-voltage environment cannot meet the needs of the actual situation. It has the following specific defects: 1. For the working electrode, that is, the test electrode, it is usually connected to the sample through a copper wire and fixed with an epoxy resin mountant, exposing only the test surface to the electrolyte. However, at high temperatures, the polyvinyl chloride insulation outside the wire is prone to aging and dissolution, which is not conducive to long-term high-temperature experiments. 2. For the reference electrode, its stability in a high-temperature environment is the key to accurate testing. When the temperature exceeds 70°C, the potential of the reference electrode may fluctuate, resulting in the inability to accurately reflect the potential changes of the working electrode. 3. In order to maintain the ion concentration and electron transfer stability of the reference electrode, the electrode needs to be filled with a conductive solution, but the solution may boil at high temperatures, affecting the accuracy of the test. 4. The reference electrodes suitable for high temperature environments on the market have high costs and extremely short service lives, and have certain limitations in neutral system environments, which is not conducive to further promotion and application.

[0004] It can be seen that for inflation electrochemical experiments, existing high-temperature electrochemical testing devices mostly focus on the sealing performance of the reaction system and the testing device, and lack consideration of the impact of inflation gas on the stability of the electrochemical system; and most devices are testing devices under high temperature and normal pressure conditions, which cannot meet the electrochemical testing needs under high-pressure environments. Summary of the invention

[0005] In view of at least one of the problems in the above-mentioned prior art, the purpose of the present invention is to provide an electrochemical testing device and testing method suitable for high-temperature inflation conditions, so as to solve the technical problems that bubbles affect the stability of the electrochemical system under inflation conditions, and the working electrode and reference electrode are easily affected under high temperature and high pressure environments, thereby affecting the test results; it is possible to realize electrochemical corrosion testing of metal samples under set temperature and pressure conditions.

[0006] To achieve the above object, the present invention adopts the following technical solutions: An electrochemical testing device suitable for high temperature gas-filled conditions, comprising: An electrochemical component, comprising a reference electrode, an auxiliary electrode, a working electrode, a salt bridge, a first reaction tank and a second reaction tank, wherein the auxiliary electrode and the working electrode are inserted in the first reaction tank, the reference electrode is inserted in the second reaction tank, and both ends of the salt bridge are respectively inserted in the first reaction tank and the second reaction tank; A temperature control component, comprising an oil bath and a thermometer, wherein the first reaction tank is arranged in the oil bath, and the thermometer is inserted in the first reaction tank; An inflation assembly, comprising a gas cylinder, wherein the gas cylinder is connected to the first reaction tank via an inflation pipe; The electrochemical workstation is connected with the working electrode and the reference electrode to form a measurement circuit; the electrochemical workstation is connected with the working electrode and the auxiliary electrode to form a polarization circuit.

[0007] Preferably, the first reaction tank and the second reaction tank are respectively provided with openings, the auxiliary electrode, the working electrode, the reference electrode, the thermometer, both ends of the salt bridge and the inflation tube are respectively inserted into the openings, and sealing plugs are respectively provided between the openings.

[0008] Preferably, the sealing plug is fixed in the opening by a sealing fixing device.

[0009] Preferably, the first reaction tank and the second reaction tank are respectively provided with raised pipe openings at the openings, and the sealing plug is inserted into the pipe openings; the sealing fixing device is configured as a cylindrical clip, the top surface of the clip is provided with an opening, and the bottom end is open; the clip is sleeved on the top of the pipe opening, and the top surface of the clip is in contact with the top surface of the pipe opening and the top surface of the sealing plug.

[0010] Preferably, the salt bridge is configured as an inverted U-shaped tube and is equipped with a valve.

[0011] Preferably, the upper end of the inflation tube is connected to the gas cylinder, and the lower end is connected to a throttle valve; the lower end of the throttle valve is connected to a conduit, and the conduit is used to pass the gas into the test solution.

[0012] Preferably, the upper ends of the reference electrode, the auxiliary electrode and the working electrode are respectively connected to the electrochemical workstation via wires, and the auxiliary electrode, the working electrode, the reference electrode and the wires are all wrapped with heat-resistant materials.

[0013] Preferably, a set gap distance is provided between the throttle valve and the electrochemical component.

[0014] An electrochemical testing method suitable for high temperature inflation conditions is implemented based on the above electrochemical testing device and includes the following steps: Adding a test medium solution into the first reaction tank and the second reaction tank respectively, so that the lower end of the auxiliary electrode, the lower end of the working electrode, the lower end of the reference electrode, the temperature probe of the thermometer, the lower end of the gas-filled tube and both ends of the salt bridge are all located in the test medium solution; Open the gas cylinder and ventilate the first reaction tank for a set time; Open the oil bath and heat it to a set temperature; Conduct electrochemical testing under high temperature and gas-filled conditions, and obtain and record electrochemical testing data through the electrochemical workstation.

[0015] An electrochemical testing method suitable for high temperature inflation conditions is characterized by being implemented based on the above electrochemical testing device and comprising the following steps: Step S1, adding a test medium solution into the first reaction tank and the second reaction tank respectively, so that the lower end of the auxiliary electrode, the lower end of the working electrode, the lower end of the reference electrode, the temperature probe of the thermometer and both ends of the salt bridge are all located in the test medium solution, and the lower end of the inflation tube is located above the test medium solution; Step S2, opening the gas cylinder, ventilating the first reaction tank for a first set time, and then closing the gas cylinder; Step S3, checking the air tightness of the electrochemical testing device. If the air tightness does not meet the requirements, replace the sealing plug and repeat steps S2 and S3; if the air tightness meets the requirements, proceed to step S4; Step S4, opening the gas cylinder to ventilate the first reaction tank for a second set time; Step S5, opening the oil bath and heating it to a set temperature; Step S6: After the electrochemical parameters and the system are stable, an electrochemical test is performed under high-temperature gasification conditions, and the electrochemical test data is acquired and recorded through the electrochemical workstation.

[0016] The present invention adopts the above technical solution, which has the following advantages: 1. The electrochemical testing device suitable for high-temperature inflation conditions provided by the present invention has an electrochemical component responsible for testing, a heating component for temperature control of the test medium, and a gas-filled component to ensure the pressure condition of the test medium. It can form a salt bridge through a T-tube to connect two reaction tanks; it can ensure the stability of the test temperature during electrochemical testing under a high-temperature environment through a heating device; the reference electrode can participate in the electrochemical reaction under normal temperature and pressure conditions through the salt bridge, so that the reference electrode does not suffer from the problem of boiling and dissolution, thereby broadening the selection range of reference electrodes for high-temperature electrochemical testing; after ventilation and heating for a set time, a high-pressure environment can be formed in the electrochemical testing device to perform electrochemical testing under high-pressure conditions; the electrochemical testing device has a reasonable structure and accurate experimental results, and the components involved are common laboratory components with low cost and simple assembly, which can greatly reduce the cost of high-temperature inflation electrochemical testing and realize the wide application of high-temperature inflation electrochemical testing.

[0017] 2. The electrochemical testing device suitable for high-temperature inflation conditions provided by the present invention can add a sealing plug and a fixing device thereof to form a sealing structure, thereby ensuring the stability and accuracy of the electrochemical testing results under inflation conditions. 3. The electrochemical testing device suitable for high-temperature inflation conditions provided by the present invention can add a throttle valve at the inflation port according to the demand for inflation of the test medium, thereby realizing the control of the size and flow rate of the bubbles during the inflation process, thereby minimizing the impact on the stability of the electrochemical system, ensuring the smoothness of the inflation process and the stability of the test system, compensating for the limitations of the electrochemical test, and making it more stable and more popularizable.

[0018] 4. The test method suitable for high-temperature gas-filled conditions provided by the present invention can solve the technical problems that bubbles affect the stability of the electrochemical system under gas-filled conditions, and the working electrode and reference electrode are easily affected under high-temperature and high-pressure environments, thereby affecting the test results; it can realize electrochemical corrosion testing of metal samples under set temperature and pressure conditions; it is suitable for electrochemical testing of samples under gas-filled conditions in high-temperature environments. The reference electrode can be used to perform electrochemical testing at room temperature through a salt bridge, and the selection of the reference electrode does not have to be limited to a high-temperature reference electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of an electrochemical testing device suitable for high-temperature inflation conditions provided by one embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the structure of a salt bridge suitable for an electrochemical testing device under high-temperature aeration conditions provided by one embodiment of the present invention.

[0021] Figure 3 It is a flow chart of an electrochemical testing method suitable for high temperature inflation conditions provided by one embodiment of the present invention.

[0022] Figure 4 It is a flow chart of an electrochemical testing method suitable for high temperature inflation conditions provided by another embodiment of the present invention.

[0023] Markings in the accompanying drawings: 1. Oil bath; 2. First reaction tank; 3. Gas charging tube; 4. Throttle valve; 5. Fastening device; 6. Auxiliary electrode; 7. Working electrode; 8. Thermometer; 9. Salt bridge; 10. Reference electrode; 11. Second reaction tank; 12. Sealing plug; 13. Electrochemical workstation; 14. Gas cylinder; 15. Valve. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. The direction of the arrow in the figure represents the direction of liquid flow.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "assembly", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The present invention provides an electrochemical testing device and a testing method suitable for use under high-temperature gas-filled conditions. The electrochemical testing device can avoid the influence of bubbles on the stability of the electrochemical system under gas-filled conditions and avoid the working electrode and the reference electrode being easily affected under high-temperature and high-pressure environments by arranging electrochemical components, temperature control components, gas-filled components and an electrochemical workstation, thereby facilitating the accuracy of the test results and achieving electrochemical corrosion testing of metal samples under set temperature and pressure conditions.

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] Example 1 Please refer to Figure 1 to Figure 2 The electrochemical testing device suitable for high-temperature inflation conditions provided in this embodiment includes an electrochemical component, a temperature control component, an inflation component and an electrochemical workstation 13, the electrochemical component includes a reference electrode 10, an auxiliary electrode 6, a working electrode 7, a salt bridge 9, a first reaction tank 2 and a second reaction tank 11, the auxiliary electrode 6 and the working electrode 7 are inserted in the first reaction tank 2, the reference electrode 10 is inserted in the second reaction tank 11, and the two ends of the salt bridge 9 are respectively inserted in the first reaction tank 2 and the second reaction tank 11; the temperature control component includes an oil bath pot 1 and a thermometer 8, the first reaction tank 2 is set in the oil bath pot 1, and the thermometer 8 is inserted in the first reaction tank 2; the inflation component includes a gas cylinder 14, and the gas cylinder 14 is connected to the first reaction tank 2 through a inflation tube 3; the electrochemical workstation 13 is connected to the working electrode 7 and the reference electrode 10 to form a measurement circuit; the electrochemical workstation 13 is connected to the working electrode 7 and the auxiliary electrode 6 to form a polarization circuit.

[0030] The electrochemical testing device of this embodiment is suitable for use under high-temperature inflation conditions and includes two circuits: one is a measurement circuit including a working electrode 7 and a reference electrode 10, which is used to test the electrochemical reaction process of the working electrode; the other is a polarization circuit including a working electrode 7 and an auxiliary electrode 6, which is used to transmit electrons to form a circuit. Among them, the working electrode (WE): the research object, is the electrode where the electrochemical reaction occurs.

[0031] Reference electrode (RE): provides a precise, known potential reference for measuring the potential of the working electrode7.

[0032] Auxiliary electrode (CE): also known as the counter electrode, its function is to conduct current and form a current loop to ensure that the reaction on the working electrode 7 can proceed smoothly.

[0033] Specifically, the working electrode 7 is made of a metal material to be tested. Auxiliary electrode 6 generally uses a platinum sheet to provide a stable reaction surface. The selection of the reference electrode 10 depends on the acidity and alkalinity of the test solution, such as using a saturated calomel electrode or a silver-silver chloride electrode in a neutral environment, a mercury-mercurous sulfate electrode in an acidic or sulfate environment, a mercury oxide electrode in an alkaline environment, and a non-mercury ion electrode in a non-aqueous system. Under high-temperature aeration conditions, the main challenges faced by the electrochemical testing device include the stability of the reference electrode 10 at high temperatures, that is, the potential drift of the reference electrode 10 in a specific gas atmosphere and the evaporation of the internal solution, and the influence of bubbles generated during the aeration process on the stability of the electrochemical system.

[0034] The electrochemical component is used in the electrochemical test process. The reference electrode 10 is set in the second reaction tank 11 that does not need to be heated, and is connected to the first reaction tank 2 through the salt bridge 9 to participate in the electrochemical test process. The temperature control component includes an oil bath pot 1 and a thermometer 8. The oil bath pot 1 is used for the installation of the first reaction tank 2 and the stability of the electrochemical test temperature conditions. The thermometer 8 is used to measure the temperature of the reaction medium before and after the electrochemical test process. The gas filling tube 3 is used to pass gas into the test medium according to the requirements of the electrochemical experiment. The electrochemical workstation 13 is used to control the electrochemical test process and obtain the electrochemical test experimental results.

[0035] The first reaction tank 2 and the second reaction tank 11 can both be flat-bottomed flasks with an open top, and the material thereof can be Hastelloy material that can withstand high temperature and high pressure conditions. The electrodes and the thermometer 8 can be sealed and installed in the two reaction tanks.

[0036] Specifically, the first reaction tank 2 and the second reaction tank 11 are respectively provided with openings, the auxiliary electrode 6, the working electrode 7, the reference electrode 10, the thermometer 8, both ends of the salt bridge 9 and the inflation tube 3 are respectively inserted into the openings, and sealing plugs 12 are respectively provided between the openings.

[0037] The tops of the first reaction tank 2 and the second reaction tank 11 are provided with multiple openings. The auxiliary electrode 6, the working electrode 7, the reference electrode 10, the thermometer 8, both ends of the salt bridge 9 and the gas charging tube 3 are respectively inserted into a separate opening, and a sealing plug 12 is respectively arranged between the respective openings.

[0038] Since the environmental conditions during the entire testing process are high temperature and high pressure, the sealing plug 12 can be fixed in the opening by the sealing fixing device 5 .

[0039] For example, the first reaction tank 2 and the second reaction tank 11 are respectively provided with raised pipe openings at the openings, and the sealing plug 12 is inserted into the pipe openings; the sealing fixing device 5 is configured as a cylindrical buckle, the top surface of the buckle is provided with an opening, and the bottom end is open; the buckle sleeve is arranged on the top of the pipe opening, and the top surface of the buckle is in contact with the top surface of the pipe opening and the top surface of the sealing plug 12.

[0040] Specifically, the salt bridge 9 is configured as an inverted U-shaped tube and is provided with a valve 15 for controlling the increase or decrease of the solution in the salt bridge 9 .

[0041] Specifically, the upper end of the gas filling tube 3 is connected to the gas cylinder 14, and the lower end is connected to the throttle valve 4; the lower end of the throttle valve 4 is connected to a conduit, and the conduit is used to pass the gas into the test solution.

[0042] The throttle valve 4 is used to control the flow rate and velocity of the injected gas, prevent gas backflow, ensure that the generated bubbles are uniform and small, and thus ensure the internal pressure of the electrochemical test device is stable. The conduit can be a rubber tube, which is used to pass the gas into the test medium according to the requirements of the electrochemical experiment.

[0043] Specifically, the reference electrode 10, the auxiliary electrode 6 and the working electrode 7 are respectively vertically inserted into a sealing plug 12, and are respectively fixed in their respective openings through their respective sealing plugs 12, so that the reference electrode 10 is fixed in the second reaction tank 11, and the auxiliary electrode 6 and the working electrode 7 are fixed in the first reaction tank 2.

[0044] The upper ends of the reference electrode 10, the auxiliary electrode 6 and the working electrode 7 are connected to the electrochemical workstation 13 through wires, respectively. The outsides of the auxiliary electrode 6, the working electrode 7 and the wires are all wrapped with heat-resistant materials.

[0045] Among them, the heat-resistant material can be fluoroplastic.

[0046] Specifically, a set gap distance is provided between the throttle valve 4 and the electrochemical component, so that the throttle valve 4 is away from the electrochemical component to prevent the movement of the inflation bubbles from affecting the stability of the test system.

[0047] Example 2 Please refer to Figures 1 to 3 The electrochemical testing method provided in this embodiment is applicable to high temperature inflation conditions and is implemented based on the electrochemical testing device described in Example 1 and includes the following steps: Step S100, adding the test medium solution into the first reaction tank 2 and the second reaction tank 11 respectively, so that the lower end of the auxiliary electrode 6, the lower end of the working electrode 7, the lower end of the reference electrode 10, the temperature probe of the thermometer 8, the lower end of the gas charging tube 3 and both ends of the salt bridge 9 are all located in the test medium solution; Step S200, open the gas cylinder 14, and ventilate the first reaction tank 2 for a set time; Step S300, open the oil bath 1 and heat it to a set temperature; Step S400 , performing an electrochemical test under high temperature and gas-filled conditions, and acquiring and recording electrochemical test data through the electrochemical workstation 13 .

[0048] In step S400, the electrochemical corrosion performance of the test material is determined through electrochemical test data.

[0049] Example 3 Please refer to Figure 1 to Figure 2 and Figure 4 The electrochemical testing method provided in this embodiment is applicable to high temperature inflation conditions and is implemented based on the electrochemical testing device of embodiment 1 and includes the following steps: Step S1, adding the test medium solution into the first reaction tank 2 and the second reaction tank 11 respectively, so that the lower end of the auxiliary electrode 6, the lower end of the working electrode 7, the lower end of the reference electrode 10, the temperature probe of the thermometer 8 and both ends of the salt bridge 9 are all located in the test medium solution, and the lower end of the inflation tube 3 is located above the test medium solution; Step S2, opening the gas cylinder 14, ventilating the first reaction tank 2 for a first set time, and then closing the gas cylinder 14; Step S3, check the air tightness of the electrochemical test device. If the air tightness does not meet the requirements, replace the sealing plug 12 and repeat steps S2 and S3; if the air tightness meets the requirements, proceed to step S4; Step S4, opening the gas cylinder 14, and ventilating the first reaction tank 2 for a second set time; Step S5, opening the oil bath 1 and heating it to a set temperature; Step S6: After the electrochemical parameters and the system are stable, an electrochemical test is performed under high-temperature gasification conditions, and the electrochemical test data is acquired and recorded through the electrochemical workstation 13 .

[0050] Wherein, in step S2, the first set time can be 5 minutes. In step S4, the second set time can be 30 minutes to 1 hour. In step S5, the set temperature can be above 70°C. In step S6, a reference electrode solution is injected into the inverted U-shaped tube to form a salt bridge 9, and then after the electrochemical test device system is stable, each electrode is connected to the electrochemical workstation 13, and after the electrochemical parameters and system are stable, an electrochemical test is performed under high temperature inflation conditions.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electrochemical testing device suitable for high temperature inflation conditions, characterized in that: include: An electrochemical component, comprising a reference electrode (10), an auxiliary electrode (6), a working electrode (7), a salt bridge (9), a first reaction tank (2) and a second reaction tank (11), wherein the auxiliary electrode (6) and the working electrode (7) are inserted in the first reaction tank (2), the reference electrode (10) is inserted in the second reaction tank (11), and both ends of the salt bridge (9) are respectively inserted in the first reaction tank (2) and the second reaction tank (11); A temperature control component, comprising an oil bath pot (1) and a thermometer (8), wherein the first reaction tank (2) is arranged in the oil bath pot (1), and the thermometer (8) is inserted in the first reaction tank (2); An inflation component, comprising a gas cylinder (15), wherein the gas cylinder (15) is connected to the first reaction tank (2) via an inflation pipe (3); The electrochemical workstation (13) is connected to the working electrode (7) and the reference electrode (10) to form a measurement circuit; the electrochemical workstation (13) is connected to the working electrode (7) and the auxiliary electrode (6) to form a polarization circuit.

2. The electrochemical testing device suitable for high temperature inflation conditions according to claim 1, characterized in that: The first reaction tank (2) and the second reaction tank (11) are respectively provided with openings, and the auxiliary electrode (6), the working electrode (7), the reference electrode (10), the thermometer (8), both ends of the salt bridge (9) and the gas filling tube (3) are respectively inserted into the openings, and sealing plugs (12) are respectively provided between the openings.

3. The electrochemical testing device suitable for high temperature inflation conditions according to claim 2, characterized in that: The sealing plug (12) is fixed in the opening by a sealing fixing device (5).

4. The electrochemical testing device suitable for high temperature inflation conditions according to claim 3, characterized in that: The first reaction tank (2) and the second reaction tank (11) are respectively provided with raised pipe openings at the openings, and the sealing plug (12) is inserted into the pipe openings; the sealing fixing device (5) is provided as a cylindrical buckle, the top surface of the buckle is provided with an opening, and the bottom end is open; the buckle is sleeved on the top of the pipe opening, and the top surface of the buckle is in contact with the top surface of the pipe opening and the top surface of the sealing plug (12).

5. The electrochemical testing device suitable for high temperature inflation conditions according to claim 1, characterized in that: The salt bridge (9) is configured as an inverted U-shaped tube and is provided with a valve (15).

6. The electrochemical testing device suitable for high temperature inflation conditions according to claim 1, characterized in that: The upper end of the inflation tube (3) is connected to the gas cylinder (15), and the lower end is connected to the throttle valve (4); the lower end of the throttle valve (4) is connected to a conduit, and the conduit is used to pass gas into the test solution.

7. The electrochemical testing device suitable for high temperature gas filling conditions according to claim 1, characterized in that: The upper ends of the reference electrode (10), the auxiliary electrode (6) and the working electrode (7) are respectively connected to the electrochemical workstation (13) via wires, and the outsides of the auxiliary electrode (6), the working electrode (7), the reference electrode (10) and the wires are all wrapped with heat-resistant materials.

8. The electrochemical testing device suitable for high temperature gas filling conditions according to any one of claims 1 to 7, characterized in that: A set gap distance is provided between the throttle valve (4) and the electrochemical component.

9. An electrochemical testing method suitable for high temperature inflation conditions, characterized in that: The electrochemical testing device according to any one of claims 1 to 8 is implemented and comprises the following steps: Adding a test medium solution into the first reaction tank (2) and the second reaction tank (11) respectively, so that the lower end of the auxiliary electrode (6), the lower end of the working electrode (7), the lower end of the reference electrode (10), the temperature probe of the thermometer (8), the lower end of the gas filling tube (3) and both ends of the salt bridge (9) are all located in the test medium solution; Opening the gas cylinder (14) and ventilating the first reaction tank (2) for a set time; Open the oil bath (1) and heat it to a set temperature; An electrochemical test is performed under high-temperature gas-filled conditions, and electrochemical test data is acquired and recorded through the electrochemical workstation (13).

10. An electrochemical testing method suitable for high temperature inflation conditions, characterized in that: The electrochemical testing device according to any one of claims 2 to 4 is implemented and comprises the following steps: Step S1, adding a test medium solution into the first reaction tank (2) and the second reaction tank (11) respectively, so that the lower end of the auxiliary electrode (6), the lower end of the working electrode (7), the lower end of the reference electrode (10), the temperature probe of the thermometer (8) and both ends of the salt bridge (9) are all located in the test medium solution, and the lower end of the inflation tube (3) is located above the test medium solution; Step S2, opening the gas cylinder (14), ventilating the first reaction tank (2) for a first set time, and then closing the gas cylinder (14); Step S3, checking the air tightness of the electrochemical testing device. If the air tightness does not meet the requirements, replace the sealing plug (12), and repeat steps S2 and S3; if the air tightness meets the requirements, proceed to step S4; Step S4, opening the gas cylinder (14) to ventilate the first reaction tank (2) for a second set time; Step S5, opening the oil bath pot (1) and heating it to a set temperature; Step S6: After the electrochemical parameters and the system are stable, an electrochemical test is performed under high-temperature gasification conditions, and electrochemical test data is acquired and recorded through the electrochemical workstation (13).

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