Electrochemical corrosion and fretting wear coupling test device under high-temperature and high-pressure water environment

Abstract

The invention discloses an electrochemical corrosion and fretting wear coupling test device in a high-temperature and high-pressure water environment, and relates to the technical field of nuclear engineering, the electrochemical corrosion and fretting wear coupling test device comprises an electric heating furnace and a base, the top surface of the electric heating furnace is fixedly provided with a high-temperature and high-pressure reaction kettle, and an electrochemical corrosion test assembly is arranged above the base; a fretting wear test assembly is arranged in the high-temperature and high-pressure reaction kettle, and a driving motor is fixedly mounted on the top surface of the base; according to the method, the interaction mechanism of the electrochemical corrosion and the fretting wear can be deeply understood by understanding the relevance between the electrochemical corrosion and the fretting wear and revealing the interaction between the electrochemical corrosion and the fretting wear. The method helps people to describe and predict the performance of the material in a specific environment more accurately, and in addition, understanding of the interaction helps people to consider these factors in a material design stage, so that the material which is more resistant to electrochemical corrosion and fretting wear is designed.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear engineering, in particular to an electrochemical corrosion and fretting wear coupling test device in a high-temperature and high-pressure water environment. Background Art

[0002] The safety of nuclear power is the lifeline of the development of the nuclear energy industry. The fuel cladding is the first and most important safety barrier in the reactor, and its structural integrity is crucial to the safe operation of nuclear power. The fuel cladding is clamped and positioned by the grid spring / rigid convex in the fuel assembly. When the lateral flow and axial flow formed by the high-speed coolant flow pass through the fuel cladding, fluid-induced vibration will be generated, namely flow-induced vibration. At the same time, the uniform corrosion of zirconium alloy in high-temperature and high-pressure water is also the main factor limiting the service life of zirconium alloy. The interaction of micro-motion wear and corrosion between the fuel cladding and the grid spring / rigid convex in the high-temperature and high-pressure water environment induced by flow-induced vibration, namely micro-motion abrasion, can cause the cladding to be worn through in severe cases, resulting in the leakage of radioactive materials and triggering nuclear safety accidents.

[0003] At present, the test equipment for electrochemical corrosion and fretting wear includes: Publication No. CN111766194B provides a wire penetration for high temperature and high pressure electrochemical corrosion test and its assembly method, which can safely realize the simultaneous penetration of wires of different diameters and materials under high temperature and high pressure conditions, thereby realizing high temperature and high pressure electrochemical tests with higher temperature and pressure requirements, such as zirconium alloy high temperature and high pressure electrochemical tests generally adopt 350℃ / 18.6MPa experimental conditions. It can only evaluate the corrosion performance of zirconium alloy in high temperature and high pressure water environment, and cannot simultaneously realize the study of its fretting wear performance.

[0004] Publication number CN115753467A provides a tangential fretting wear test assembly and method in a horizontal high-temperature and high-pressure water environment, which solves the problem that existing fretting wear tests are difficult to simulate the real environment of the parts to be tested, such as the fretting wear between the zirconium alloy fuel cladding and the positioning grid in a high-temperature and high-pressure water environment, but it is impossible to monitor the corrosion behavior of the zirconium alloy in this environment in real time.

[0005] In view of this, a device for coupling electrochemical corrosion and fretting wear in a high-temperature and high-pressure water environment is provided to overcome the above-mentioned defects. Summary of the invention

[0006] The purpose of the present invention is to provide an electrochemical corrosion and fretting wear coupling test device in a high-temperature and high-pressure water environment to solve the problems raised in the above-mentioned background technology.

[0007] In order to solve the above technical problems, the present invention provides an electrochemical corrosion and micro-wear coupling test device in a high-temperature and high-pressure water environment, comprising an electric heating furnace and a base, a high-temperature and high-pressure reactor is fixedly installed on the top surface of the electric heating furnace, an electrochemical corrosion test assembly is arranged above the base, a micro-wear test assembly is arranged inside the high-temperature and high-pressure reactor, a driving motor is fixedly installed on the top surface of the base, and a force sensor is arranged on the outer wall of the high-temperature and high-pressure reactor.

[0008] Furthermore, the high-temperature and high-pressure reactor is divided into two parts, namely, a reactor cover and a reactor body, wherein a pressure relief valve and a pressure gauge are fixedly installed on the top surface of the covering part.

[0009] Furthermore, the electrochemical corrosion test assembly includes an electrochemical workstation fixedly mounted on the top surface of the base, and a counter electrode, a working electrode and a reference electrode fixedly mounted on the top surface of the outer wall of the high-temperature and high-pressure reactor.

[0010] Furthermore, the micro-motion wear test assembly includes a tangential moving platform movably installed on the bottom surface of the inner wall of the high-temperature and high-pressure reactor, a lower clamp is fixedly installed on the top surface of the tangential moving platform, an upper clamp support rod is installed inside the high-temperature and high-pressure reactor, an upper clamp normal moving axis is installed inside the upper clamp support rod, an upper clamp is fixedly installed on the bottom surface of the upper clamp normal moving axis, a pressure rod is fixedly installed inside the upper clamp, and the drive motor is transmission-connected to the tangential moving platform.

[0011] Furthermore, a water tank is fixedly installed inside the base, a water pump is fixedly connected to the bottom end of the water tank, and the other end of the water pump is connected to the electric heating furnace.

[0012] Furthermore, the water pump is connected to the electric heating furnace via two pipes, and valves are provided on the outer walls of the two pipes.

[0013] Furthermore, it also includes a human-computer interaction system, which is electrically connected to the force sensor and the electrochemical workstation.

[0014] Furthermore, the top ends of the counter electrode, the working electrode and the reference electrode are fixedly connected with connecting wires, and the other ends of the connecting wires are fixedly connected to the electrochemical workstation.

[0015] Furthermore, a cavity is opened inside the lower clamp, a movable conical block is installed inside the cavity, a rotatable worm is installed inside the cavity, a rotatable turbine is installed at the bottom of the inner wall of the cavity, a threaded rod is fixedly connected above the turbine, and the conical block is threadedly connected to the outer wall of the threaded rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] By understanding the correlation between electrochemical corrosion and fretting wear and revealing their interaction, we can have a deeper understanding of the interaction mechanism between electrochemical corrosion and fretting wear. This helps us to more accurately describe and predict the performance of materials in specific environments. In addition, understanding this interaction helps us take these factors into account in the material design stage, thereby designing materials that are more resistant to electrochemical corrosion and fretting wear.

[0018] By understanding the correlation between electrochemical corrosion and fretting wear and revealing their interaction, the structure and operating conditions of equipment involving friction and corrosion, such as automotive parts, electrical connectors, piping systems, etc., can be optimized to improve the performance and reliability of the equipment.

[0019] By using polytetrafluoroethylene high temperature resistant sealant to seal the kettle cover and the kettle body, the device is less likely to experience temperature and pressure relief during use, thereby increasing the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the rear side of the present invention;

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the front side of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the present invention viewed from above;

[0023] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle;

[0024] Figure 5 It is a schematic diagram of the internal structure of the present invention;

[0025] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at B in the middle;

[0026] Figure 7 It is a schematic diagram of the experimental structure of the present invention;

[0027] Figure 8 This is a schematic diagram of the lower clamping jaw structure of the present invention;

[0028] Fig. 9 It is a schematic diagram of the structure inside the lower clamping jaw of the present invention.

[0029] In the figure: 1. Electric heating furnace; 2. Base; 3. Electrochemical workstation; 4. High temperature and high pressure reactor; 5. Pressure relief valve; 6. Pressure gauge; 7. Driving motor; 8. Water tank; 9. Water pump; 10. Valve; 11. Force sensor; 12. Weight; 13. Upper fixture support rod; 14. Counter electrode; 15. Working electrode; 16. Reference electrode; 17. Upper fixture normal moving axis; 18. Upper fixture; 19. Pressure rod; 20. Sample;

[0030] 21, lower clamp; 211, conical block; 212, worm; 213, turbine; 214, threaded rod; 215, limit rod; 216, sprocket; 217, chain;

[0031] 22. Tangential mobile platform. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the present invention.

[0033] Embodiment 1

[0034] See also Figure 1-7 A device for coupling electrochemical corrosion and micro-wear testing in a high-temperature and high-pressure water environment comprises an electric heating furnace 1 and a base 2. A high-temperature and high-pressure reactor 4 is fixedly installed on the top surface of the electric heating furnace 1, an electrochemical corrosion test component is arranged above the base 2, a micro-wear test component is arranged inside the high-temperature and high-pressure reactor 4, a driving motor 7 is fixedly installed on the top surface of the base 2, and a force sensor 11 is arranged on the outer wall of the high-temperature and high-pressure reactor 4.

[0035] For further information, see Figure 5 A water tank 8 is fixedly installed inside the base 2, and a water pump 9 is fixedly connected to the bottom end of the water tank 8. The other end of the water pump 9 is connected to the electric heating furnace 1. The water pump 9 is connected to the electric heating furnace 1 through two pipes. Valves 10 are arranged on the outer walls of the two pipes. By arranging the water tank 8 and the water pump 9, the water in the device can be replaced, which is convenient for the user to limit the water use of the device. For example, when applied to the test of zirconium alloy, the BL i aqueous solution can be stored in the water tank 8, and by controlling the electric heating furnace 1, the environment in the high-temperature and high-pressure reactor 4 reaches 350℃ / 18.6MPa, so that the experimental environment of the zirconium alloy truly simulates the service conditions in the reactor, thereby increasing the accuracy of the experiment.

[0036] For further information, see Figure 5-6The electrochemical corrosion test assembly includes an electrochemical workstation 3 fixedly mounted on the top surface of a base 2, a counter electrode 14, a working electrode 15 and a reference electrode 16 fixedly mounted on the top surface of an outer wall of a high-temperature and high-pressure reactor 4, a micro-motion wear test assembly includes a tangential moving platform 22 movably mounted on the bottom surface of an inner wall of the high-temperature and high-pressure reactor 4, a lower fixture 21 is fixedly mounted on the top surface of the tangential moving platform 22, an upper fixture support rod 13 is mounted inside the high-temperature and high-pressure reactor 4, an upper fixture normal moving axis 17 is mounted inside the upper fixture support rod 13, an upper fixture 18 is fixedly mounted on the bottom surface of the upper fixture normal moving axis 17, a pressure rod 19 is fixedly mounted inside the upper fixture 18, a driving motor 7 is transmission-connected to the tangential moving platform 22, and a micro-motion wear test assembly is set, and a driving motor 7 is transmission-connected to the tangential moving platform The platform 22 is used to place the sample 20 on the top of the lower fixture 21. After the drive motor 7 is started to drive the tangential moving platform 22 to move, the micro-motion wear test of the sample 20 can be completed. At the same time, the friction force (F), contact time (t), displacement amplitude (D), energy dissipation (E) of the contact interface are analyzed and measured, and the micro-motion wear mechanism of the contact interface is studied in real time. Finally, the data is transmitted to the human-computer interaction system through the force sensor 11 to realize data analysis and recording. At the same time, by setting up an electrochemical corrosion test component, the device can perform in-situ high-precision measurement and analysis of the open circuit potential (V), corrosion current (i) and AC impedance (R) of the contact interface during the micro-motion process, so as to monitor the corrosion behavior of the contact interface in real time, wherein the contact surface is connected to the working electrode 15 and the sample 20 by a metal wire to achieve contact.

[0037] It should be noted that since the metal wire cannot be welded after etching, the metal wire is welded to the sample 20 before pre-etching. The other working parts except the working electrode 15 are insulated with polytetrafluoroethylene (PTFE).

[0038] In addition, the upper clamp support rod 13 is installed inside the high-temperature and high-pressure reactor 4, which facilitates the installation of the upper clamp 18. At the same time, a pressure gauge 6 is installed on the top surface of the high-temperature and high-pressure reactor 4 to facilitate the user to observe the internal pressure of the high-temperature and high-pressure reactor 4 in real time.

[0039] In addition, it also includes a human-computer interaction system, which is electrically connected to the force sensor 11 and the electrochemical workstation 3 at the same time. The tops of the counter electrode 14, the working electrode 15 and the reference electrode 16 are fixedly connected with connecting wires, and the other ends of the connecting wires are fixedly connected to the electrochemical workstation 3. The human-computer interaction system is written by Labview, which is used by the user to set the target temperature value, pressure value, etc., as well as to display the collected force, displacement and other data, and send a signal to the controller according to the user's set value through serial communication, so as to control the test device to meet the test requirements. At the same time, by using CH I66E software, the measurement data such as open circuit potential (V), corrosion current (i) and AC impedance (R) can be displayed.

[0040] In addition, the weight 12 is sleeved on the outer wall of the normal moving axis 17 of the upper fixture.

[0041] During the specific implementation, the upper clamp 18 and the lower clamp 21 are first installed and the required normal load is loaded on the normal moving axis of the upper clamp 18 through the weight 12, and then the zirconium alloy tube and its grinding pair are fixed to the lower clamp 21 and the upper clamp 18 respectively through bolts and pressure rods 19. After filling with water, the valve 10 is closed, the test device is started, and the temperature and pressure in the reactor are waited to reach the set value and be in a stable state, and the airtightness and thermal insulation performance of the high-temperature and high-pressure reactor 4 are observed.

[0042] Before conducting the coupling test, observe the temperature and pressure values ​​of the test device. When the temperature reaches the set value and the fluctuation does not exceed 2°C, and the pressure reaches the set value and stabilizes at this value, the coupling test conditions are met.

[0043] Conduct electrochemical corrosion and micro-wear coupling preliminary tests to observe whether the parameters related to corrosion and wear are stable and measurable. If normal, prepare for formal tests. Otherwise, check for error points and shut down the device for maintenance.

[0044] After the preliminary experiment is completed, the formal experiment is carried out. When the experimental environment in the high-temperature and high-pressure reactor 4 is stable, the micro-motion wear test is started. After the micro-motion wear test is running stably, the electrochemical system starts to work, and the CHI 66E software is opened to start the electrochemical measurement. First, the open circuit voltage is measured, the open circuit voltage-time curve is observed, and the open circuit voltage value is recorded. AC impedance measurement is performed, and the Nyquist curve and Bode curve are observed. Check whether the experimental data are complete and accurate. If the data is wrong, repeat the previous work and the current work. Otherwise, carry out the next measurement and save the experimental data. After the data is saved, polarization analysis is performed to observe the relationship curve between the electrode potential and the polarization current or polarization current density, that is, the Tafe l curve. Save the experimental data and the electrochemical measurement is completed.

[0045] It should be noted that polarization analysis is a destructive method for detecting the electrochemical properties of alloys. Since the corrosion of the tube sample changes during the polarization process, once the sample is polarized, it cannot be restored to the corrosion state before the polarization analysis. Therefore, one working electrode 15 can only perform one electrochemical analysis.

[0046] The experiment is now completed, and the micro-motion wear test of zirconium alloy and other materials under different service conditions is carried out. The Ft-D curve and wear scar damage characteristics are analyzed through the experimental data. At the same time, the self-corrosion potential monitoring, linear polarization and dynamic potential scanning methods are used to study the mechanism of corrosion during micro-motion. Finally, based on the change law of characteristic quantities such as friction interface displacement amplitude, friction force, corrosion current, corrosion potential, and AC impedance, the correlation between electrochemical corrosion and micro-motion wear is explained, and the interaction and competition mechanism of electrochemical corrosion and wear during micro-motion is revealed.

[0047] By understanding the correlation between electrochemical corrosion and fretting wear and revealing their interaction, we can have a deeper understanding of the interaction mechanism between electrochemical corrosion and fretting wear. This helps us to more accurately describe and predict the performance of materials in specific environments. In addition, understanding this interaction helps us take these factors into account in the material design stage, thereby designing materials that are more resistant to electrochemical corrosion and fretting wear.

[0048] By understanding the correlation between electrochemical corrosion and fretting wear and revealing their interaction, the structure and operating conditions of equipment involving friction and corrosion, such as automotive parts, electrical connectors, piping systems, etc., can be optimized to improve the performance and reliability of the equipment.

[0049] Embodiment 2

[0050] Based on Example 1, please refer to Figure 1-7 , an electrochemical corrosion and micro-wear coupling test device under high temperature and high pressure water environment, wherein the high temperature and high pressure reactor 4 is divided into two parts: a reactor cover and a reactor body, wherein a pressure relief valve 5 and a pressure gauge 6 are fixedly installed on the top surface of the covering part. It should be noted that polytetrafluoroethylene (PTFE) high temperature resistant sealant is used for sealing between the reactor cover and the reactor body.

[0051] By using polytetrafluoroethylene high temperature resistant sealant to seal the kettle cover and the kettle body, the device is less likely to experience temperature and pressure relief during use, thereby increasing the stability of the device.

[0052] Embodiment 3

[0053] Based on Example 1, please refer to Figure 8-9, an electrochemical corrosion and micro-wear coupling test device under high temperature and high pressure water environment, wherein a cavity is opened inside the lower clamp 21, a movable conical block 211 is installed inside the cavity, a rotatable worm 212 is installed inside the cavity, a rotatable turbine 213 is installed at the bottom of the inner wall of the cavity, a threaded rod 214 is fixedly connected above the turbine 213, and the conical block 211 is threadedly connected to the outer wall of the threaded rod 214.

[0054] It should be noted that there are two conical blocks 211, and the number of components used to drive the conical blocks 211 is also two. Among them, the ends of the two worm gears 212 are fixedly connected with sprockets 216, and the outer walls of the two sprockets 216 are simultaneously engaged with chains 217. In this way, after the worm gear 212 on one side rotates to drive the conical block 211 to rise, the conical block 211 at the other end will rise synchronously.

[0055] In addition, it should be noted that two limit rods 215 are fixedly installed at the bottom of the inner wall of the cavity opened inside the lower clamp 21, and the conical block 211 can be slidably mounted on the outer wall of the limit rod 215. This arrangement prevents the conical block 211 from tilting easily when the sample 20 directly rubs against the conical block 211, thereby improving the accuracy of the test.

[0056] In practice, only single test data can be obtained by performing wear test on single sample 20. Figure 1-7 As shown in , the two samples 20 are both cylindrical, and only the test data between the cylinders can be obtained by friction between them.

[0057] At this time, the user can rotate the worm 212, so that the worm 212 drives the turbine 213 to rotate, thereby driving the threaded rod 214 to rotate through the turbine 213. After the threaded rod 214 rotates, the conical block 211 can be pushed upward, so that the conical block 211 directly contacts the sample 20. At this time, the test data between the conical block 211 and the cylinder can be obtained by conducting another test.

[0058] When the wear test is performed on the conical block 211 and the sample 20, the geometric shape of the conical block 211 is more complex than that of the sample 20. Therefore, when performing the wear test on the conical block 211 and the sample 20, a more complex and diverse stress distribution can be generated, which helps to simulate the service conditions of the material under different stress states in actual working conditions, thereby more comprehensively evaluating the performance of the material.

[0059] In addition, the edge of the conical block 211 may generate higher local stress and more severe wear when contacting the specimen 20. This enhanced wear simulation effect helps to accelerate the test process, shorten the research cycle, and also helps to reveal the wear behavior of the material under extreme conditions.

[0060] Working principle: first install the upper fixture 18 and the lower fixture 21 and load the required normal load on the normal moving axis of the upper fixture 18 through the weight 12, then fix the zirconium alloy tube and its grinding pair to the lower fixture 21 and the upper fixture 18 respectively through bolts and pressure rods 19, first install the reference electrode 16, the counter electrode 14 and the working electrode 15 on the kettle cover, and connect the working electrode 15 to the zirconium alloy tube with zirconium wire, then connect the three-electrode system to the electrochemical workstation 3, and finally connect the electrochemical workstation 3 to the human-computer interaction interface, connect the power supply, open the human-computer interaction interface written by Labview, set the target temperature, pressure, displacement amplitude, number of cycles, frequency, data acquisition interval and other parameters, connect the drive motor 7, water pump 9 and electric heating furnace 1, open the valve 10 and close the valve 10 after filling the kettle with water, start the test device, wait for the temperature and pressure in the kettle to reach the set value and be in a stable state, and observe the airtightness and thermal insulation performance of the high-temperature and high-pressure reactor 4.

[0061] Before conducting the coupling test, observe the temperature and pressure values ​​of the test device. When the temperature reaches the set value and the fluctuation does not exceed 2°C, and the pressure reaches the set value and stabilizes at this value, the coupling test conditions are met.

[0062] Conduct electrochemical corrosion and micro-wear coupling preliminary tests to observe whether the parameters related to corrosion and wear are stable and measurable. If normal, prepare for formal tests. Otherwise, check for error points and shut down the device for maintenance.

[0063] After the preliminary experiment is completed, the formal experiment is carried out. When the experimental environment in the high-temperature and high-pressure reactor 4 is stable, the micro-motion wear test is started. After the micro-motion wear test is running stably, the electrochemical system starts to work, and the CH I 66E software is opened to start the electrochemical measurement. First, the open circuit voltage is measured, the open circuit voltage-time curve is observed, and the open circuit voltage value is recorded. AC impedance measurement is performed, and the Nyquist curve and Bode curve are observed. Check whether the experimental data are complete and accurate. If the data is wrong, repeat the previous work and the current work. Otherwise, carry out the next measurement and save the experimental data. After the data is saved, polarization analysis is performed to observe the relationship curve between the electrode potential and the polarization current or polarization current density, that is, the Tafe l curve. Save the experimental data and the electrochemical measurement is completed.

[0064] It should be noted that polarization analysis is a destructive method for detecting the electrochemical properties of alloys. Since the corrosion of the tube sample changes during the polarization process, once the sample is polarized, it cannot be restored to the corrosion state before the polarization analysis. Therefore, one working electrode 15 can only perform one electrochemical analysis.

[0065] The experiment is now completed, and the micro-motion wear test of zirconium alloy and other materials under different service conditions is carried out. The Ft-D curve and wear scar damage characteristics are analyzed through the experimental data. At the same time, the self-corrosion potential monitoring, linear polarization and dynamic potential scanning methods are used to study the mechanism of corrosion during micro-motion. Finally, based on the change law of characteristic quantities such as friction interface displacement amplitude, friction force, corrosion current, corrosion potential, and AC impedance, the correlation between electrochemical corrosion and micro-motion wear is explained, and the interaction and competition mechanism of electrochemical corrosion and wear during micro-motion is revealed.

[0066] By understanding the correlation between electrochemical corrosion and fretting wear and revealing their interaction, we can have a deeper understanding of the interaction mechanism between electrochemical corrosion and fretting wear. This helps us to more accurately describe and predict the performance of materials in specific environments. In addition, understanding this interaction helps us take these factors into account in the material design stage, thereby designing materials that are more resistant to electrochemical corrosion and fretting wear.

[0067] By understanding the correlation between electrochemical corrosion and fretting wear and revealing their interaction, the structure and operating conditions of equipment involving friction and corrosion, such as automotive parts, electrical connectors, piping systems, etc., can be optimized to improve the performance and reliability of the equipment.

[0068] By using polytetrafluoroethylene high temperature resistant sealant to seal the kettle cover and the kettle body, the device is less likely to experience temperature and pressure relief during use, thereby increasing the stability of the device.

Claims

1. An electrochemical corrosion and fretting wear coupling test device in a high temperature and high pressure water environment, comprising an electric heating furnace (1) and a base (2), characterized in that: A high-temperature and high-pressure reactor (4) is fixedly mounted on the top surface of the electric heating furnace (1), an electrochemical corrosion test assembly is arranged above the base (2), a micro-motion wear test assembly is arranged inside the high-temperature and high-pressure reactor (4), a driving motor (7) is fixedly mounted on the top surface of the base (2), and a force sensor (11) is arranged on the outer wall of the high-temperature and high-pressure reactor (4).

2. The electrochemical corrosion and fretting wear coupling test device in a high temperature and high pressure water environment as claimed in claim 1, characterized in that: The high-temperature and high-pressure reaction kettle (4) is divided into two parts: a kettle cover and a kettle body, wherein a pressure relief valve (5) and a pressure gauge (6) are fixedly installed on the top surface of the cover part.

3. The electrochemical corrosion and fretting wear coupling test device in a high temperature and high pressure water environment as claimed in claim 1, characterized in that: The electrochemical corrosion test assembly comprises an electrochemical workstation (3) fixedly mounted on the top surface of a base (2), and a counter electrode (14), a working electrode (15) and a reference electrode (16) fixedly mounted on the top surface of an outer wall of a high-temperature and high-pressure reactor (4).

4. The electrochemical corrosion and fretting wear coupling test device in a high temperature and high pressure water environment as claimed in claim 1, characterized in that: The micro-motion wear test assembly comprises a tangential moving platform (22) movably mounted on the bottom surface of the inner wall of a high-temperature and high-pressure reactor (4); a lower fixture (21) is fixedly mounted on the top surface of the tangential moving platform (22); an upper fixture support rod (13) is mounted inside the high-temperature and high-pressure reactor (4); an upper fixture normal moving axis (17) is mounted inside the upper fixture support rod (13); an upper fixture (18) is fixedly mounted on the bottom surface of the upper fixture normal moving axis (17); a pressure rod (19) is fixedly mounted inside the upper fixture (18); and the drive motor (7) is transmission-connected to the tangential moving platform (22).

5. The electrochemical corrosion and fretting wear coupling test device in a high temperature and high pressure water environment as claimed in claim 1, characterized in that: A water tank (8) is fixedly installed inside the base (2), a water pump (9) is fixedly connected to the bottom end of the water tank (8), and the other end of the water pump (9) is connected to the electric heating furnace (1).

6. The electrochemical corrosion and fretting wear coupling test device in a high temperature and high pressure water environment as claimed in claim 5, characterized in that: The water pump (9) is connected to the electric heating furnace (1) via two pipes, and valves (10) are provided on the outer walls of the two pipes.

7. The electrochemical corrosion and fretting wear coupling test device in a high temperature and high pressure water environment as claimed in claim 3, characterized in that: It also includes a human-machine interaction system, which is electrically connected to the force sensor (11) and the electrochemical workstation (3).

8. The electrochemical corrosion and fretting wear coupling test device in a high temperature and high pressure water environment as claimed in claim 3, characterized in that: The top ends of the counter electrode (14), the working electrode (15) and the reference electrode (16) are fixedly connected with connecting wires, and the other ends of the connecting wires are fixedly connected to the electrochemical workstation (3).

9. The electrochemical corrosion and fretting wear coupling test device in a high temperature and high pressure water environment as claimed in claim 4, characterized in that: The lower clamp (21) has a cavity formed inside, a movable conical block (211) is installed inside the cavity, a rotatable worm (212) is installed inside the cavity, a rotatable turbine (213) is installed at the bottom of the inner wall of the cavity, a threaded rod (214) is fixedly connected above the turbine (213), and the conical block (211) is threadedly connected to the outer wall of the threaded rod (214).

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