A multifunctional stress corrosion experiment device

Abstract

The application discloses a multifunctional stress corrosion experiment device. The device comprises a double-layer corrosion pool composed of an outer corrosion pool wall and an inner corrosion pool wall, and a first space is formed between the outer corrosion pool wall and the inner corrosion pool wall; the inner corrosion pool wall surrounds a second space; the double-layer corrosion pool is provided with a corrosion medium inlet and a corrosion medium outlet, the corrosion medium inlet and the corrosion medium outlet both penetrate through the outer corrosion pool wall and the inner corrosion pool wall at the same time, and are communicated with the second space; a temperature control medium inlet and a temperature control medium outlet which are communicated with the first space are respectively arranged on the outer corrosion pool wall; a corrosion pool cover plate is arranged at the upper end of the double-layer corrosion pool, and a sample support and a stress loading assembly are arranged on the corrosion pool cover plate. The device can realize comprehensive coupling of multi-factor corrosion working conditions at different temperatures, has high practicability and compact structure, and can meet the miniaturization and multifunctional requirements in a laboratory environment.

Description

Technical Field

[0001] This invention belongs to the technical field of material corrosion measurement devices, specifically relating to a multifunctional stress corrosion testing device. Background Technology

[0002] In practical engineering applications, components made of metals and composite materials often encounter complex conditions such as stress corrosion, coupled corrosion under stress and varying temperature environments, and corrosion under alternating wet and dry conditions. Accurate reproduction of these corrosion conditions is crucial for obtaining precise experimental data that closely reflects actual conditions. This data is essential to guide engineering problem-solving and prevent major engineering failures caused by corrosion. However, small-scale, multi-factor coupled corrosion testing equipment is lacking. Commonly used slow tensile corrosion testing machines can only perform stress corrosion experiments under immersion conditions, failing to simulate environmental conditions or conduct electrochemical corrosion experiments under coupled stress, temperature, and other factors. This hinders the development of stress corrosion electrochemical testing, creating difficulties for experimental research and corrosion data acquisition, resulting in a lack of accurate data and severely impeding the development of stress corrosion simulation calculations.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides a multifunctional stress corrosion testing apparatus. The technical problem to be solved by this invention is achieved through the following technical solution: This invention provides a multifunctional stress corrosion testing device, including a double-layer corrosion tank, wherein the double-layer corrosion tank includes an outer corrosion tank wall and an inner corrosion tank wall; A first space is formed between the outer corrosion tank wall and the inner corrosion tank wall to contain the temperature control medium; the inner corrosion tank wall encloses a second space. The double-layer corrosion tank is provided with a corrosion medium inlet and a corrosion medium outlet. Both the corrosion medium inlet and the corrosion medium outlet penetrate the outer corrosion tank wall and the inner corrosion tank wall, and communicate with the second space. The outer corrosion tank wall is provided with a temperature-controlled medium inlet and a temperature-controlled medium outlet that communicate with the first space. The upper end of the double-layer corrosion pool is provided with a corrosion pool cover plate, and the corrosion pool cover plate is provided with a sample support and a stress loading component; the sample support is used to fix the sample to be tested, and the stress loading component is used to apply a preset stress to the sample to be tested.

[0005] In one embodiment of the present invention, the sample holder is fixed to the lower side of the corrosion pool cover plate, and the sample holder extends into a predetermined position within the second space.

[0006] In one embodiment of the present invention, the stress loading assembly includes a stress loading screw and a stress loading controller for controlling the stress loading screw; the stress loading screw passes through the corrosion tank cover plate for contacting the sample to be tested, and the stress loading controller is fixedly disposed on the upper side of the corrosion tank cover plate.

[0007] In one embodiment of the present invention, an electrode assembly is further included, the electrode assembly including a reference electrode, a reference electrode and a working electrode; The reference electrode and the counter electrode are disposed through the corrosion tank cover plate, and the working electrode is the stress loading screw.

[0008] In one embodiment of the present invention, a corrosive medium pump is further included, the corrosive medium pump being connected to the corrosive medium inlet via a first pipeline; a first valve is provided on the first pipeline; The corrosive medium outlet is connected to a second pipeline, and a second valve is installed on the second pipeline.

[0009] In one embodiment of the present invention, a liquid level sensor is further included, which is disposed on the underside of the corrosion tank cover plate and is used to detect the height of the liquid level in the second space.

[0010] In one embodiment of the present invention, the corrosion tank cover is connected to the upper part of the double-layer corrosion tank by threads or flanges.

[0011] In one embodiment of the present invention, the temperature control medium inlet is located on the bottom side of the outer corrosion tank wall, and the temperature control medium outlet is located on the top side of the outer corrosion tank wall. The corrosive medium inlet is located on the bottom side of the double-layer corrosion tank, and the corrosive medium outlet is located on the top side of the double-layer corrosion tank.

[0012] In one embodiment of the present invention, the temperature control medium includes silicone oil or water.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention presents a multifunctional stress corrosion testing apparatus, which solves several technical challenges in stress corrosion experiments, including large stress application errors by ordinary fixtures, difficulty in acquiring electrochemical data under stress, a lack of apparatus for coupled corrosion experiments involving stress, temperature environment, and electrochemistry, and the ability to reproduce gas-liquid and alternating gas-liquid corrosion conditions. This apparatus can perform immersion corrosion, stress corrosion, gas-liquid interface corrosion, and tidal corrosion experiments under alternating wet and dry conditions at different ambient temperatures, as well as electrochemical corrosion experiments and data testing under these conditions, providing strong technical support for corrosion research and data testing. Furthermore, it offers advantages such as high precision in controlling experimental conditions, comprehensive coupling of multiple corrosion conditions, and strong practicality.

[0014] 2. The multifunctional stress corrosion experimental device provided by the present invention has a compact structure and is easy to operate, and can meet the needs of miniaturized and multifunctional experiments in laboratory environments.

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a front cross-sectional view of a multifunctional stress corrosion testing device provided in an embodiment of the present invention; Figure 2 This is a side cross-sectional view of a multifunctional stress corrosion testing device provided in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1-Outer corrosion tank wall; 2-Inner corrosion tank wall; 3-Corrosion medium inlet; 4-Corrosion medium outlet; 5-Temperature-controlled medium inlet; 6-Temperature-controlled medium outlet; 7-Corrosion tank cover; 8-Sample support; 9-Stress loading screw; 10-Stress loading controller; 11-Reference electrode; 12-Counter electrode; 13-Corrosion medium pump; 131-Medium pump piston; 14-First pipeline; 15-First valve; 16-Second pipeline; 17-Second valve; 100-Sample to be tested. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description of a multifunctional stress corrosion testing device based on the present invention is provided in conjunction with the accompanying drawings and specific embodiments.

[0019] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a more in-depth and concrete understanding can be gained of the technical means and effects adopted by the present invention to achieve its intended purpose. However, the accompanying drawings are for reference and illustration only and are not intended to limit the technical solutions of the present invention.

[0020] It should be noted that in this document, the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0022] In this invention, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, the terms "comprising," "including," or any other variations are intended to cover a non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not expressly listed.

[0023] This invention provides a multifunctional stress corrosion testing apparatus, see [link to relevant documentation]. Figure 1 The system includes a double-layer corrosion tank, comprising an outer corrosion tank wall 1 and an inner corrosion tank wall 2. A first space is formed between the outer corrosion tank wall 1 and the inner corrosion tank wall 2 to contain a temperature-controlled medium; the inner corrosion tank wall 2 encloses a second space. The double-layer corrosion tank is provided with a corrosion medium inlet 3 and a corrosion medium outlet 4, both of which penetrate both the outer corrosion tank wall 1 and the inner corrosion tank wall 2 and communicate with the second space. A temperature-controlled medium inlet 5 and a temperature-controlled medium outlet 6, both communicating with the first space, are respectively provided on the outer corrosion tank wall 1. A corrosion tank cover plate 7 is provided at the upper end of the double-layer corrosion tank to seal the corrosion tank and provide installation interfaces for various components. A sample holder 8 and a stress loading assembly are provided on the corrosion tank cover plate 7. The sample holder 8 is used to fix the sample to be tested 100, and the stress loading assembly is used to apply a preset stress to the sample to be tested 100.

[0024] In one example, such as Figure 1 and Figure 2As shown, the outer corrosion tank wall 1 and the inner corrosion tank wall 2 of the double-layer corrosion tank can be arranged in a concentric cylindrical structure, with the inner corrosion tank wall 2 nested inside the outer corrosion tank wall 1. A first annular space is formed between the outer corrosion tank wall 1 and the inner corrosion tank wall 2 to accommodate the temperature control medium. The internal space enclosed by the inner corrosion tank wall 2 is a second space used to accommodate the corrosive medium and the sample 100 to be tested. In another example, the outer corrosion tank wall 1 and the inner corrosion tank wall 2 of the double-layer corrosion tank can also be a nested rectangular structure.

[0025] In one example, the sample holder 8 is fixed to the lower side of the corrosion tank cover 7, and can be fixed by bolts or welding to ensure that the sample holder 8 remains stable during the experiment. The sample holder 8 extends into a preset position within the second space so that the sample 100 to be tested is located at the test position. The lower end of the sample holder 8 may be provided with a clamping part for clamping the sample 100 to be tested, and the clamping part is made of a corrosion-resistant material.

[0026] In one example, the stress loading assembly includes a stress loading screw 9 and a stress loading controller 10 for controlling the stress loading screw 9. The stress loading screw 9 penetrates the corrosion tank cover plate 7 to abut against the sample 100 under test, and the stress loading controller 10 is fixedly disposed on the upper side of the corrosion tank cover plate 7. For example, the stress loading screw 9 is configured as a hollow or solid structure, and its outer surface is provided with external threads. The stress loading controller 10 is fixedly disposed on the upper side of the corrosion tank cover plate 7 and is provided with internal threads that mate with the external threads. The stress loading controller 10 includes a motor and a reducer. The motor is connected to the input end of the reducer, and the output end of the reducer is connected to the stress loading screw 9. The motor drives the reducer to operate, and the reducer reduces the speed of the motor and increases the torque before transmitting it to the stress loading screw 9, causing the stress loading screw 9 to rotate slowly and move downward. When the stress loading screw 9 moves downward, its lower end abuts against the test sample 100, applying pressure to the test sample 100 and causing deformation, thereby achieving stress loading. The material properties and experimental parameters of the test sample 100 (such as stress magnitude, material yield strength, sample thickness, fulcrum distance, etc.) can be input into the control system of the stress loading controller 10. The control system calculates the running distance of the stress loading screw 9 based on the input parameters, precisely controlling the magnitude of the stress applied to the test sample 100.

[0027] For example, the corrosion tank cover 7 can be connected to the upper part of the double-layer corrosion tank via threads or flanges. A sealing ring can be provided between the corrosion tank cover 7 and the double-layer corrosion tank to prevent leakage of the corrosive medium. The corrosion tank cover 7 is provided with multiple mounting holes for mounting the sample holder 8, stress loading assembly, and electrode assembly.

[0028] In one example, the temperature-controlled medium inlet 5 is located near the bottom of the outer corrosion tank wall 1, and the temperature-controlled medium outlet 6 is located near the top of the outer corrosion tank wall 1. This allows the temperature-controlled medium to enter the first space from the bottom and flow upwards and out from the top, forming a continuous circulating flow. This enables more uniform heating or cooling of the corrosion medium in the second space. For example, the temperature-controlled medium can be silicone oil or water. Silicone oil has a high boiling point and good thermal stability, making it suitable for high-temperature experiments, while water is suitable for temperature control near room temperature.

[0029] The corrosive medium inlet 3 is located on the bottom side of the double-layer corrosion tank, which facilitates the corrosive medium to enter from the bottom and gradually fill the second space, reducing the generation of bubbles; the corrosive medium outlet 4 is located on the top side of the double-layer corrosion tank, which facilitates the corrosive medium to be discharged from the top.

[0030] In one embodiment of the invention, an electrode assembly is also included, comprising a reference electrode 11, a counter electrode 12, and a working electrode. The reference electrode 11 and counter electrode 12 are disposed through the corrosion tank cover plate 7. The working electrode can be a stress-loading screw 9, or a separate working electrode assembly can be provided. In one example, the stress-loading screw 9 is used as the working electrode, allowing electrochemical testing to be performed simultaneously with stress loading, simplifying the device structure. During stress corrosion electrochemical testing, the contact area between the sample holder 8 and the sample 100 under test needs to be insulated, typically using an insulating coating or insulating gasket, to avoid generating additional current loops.

[0031] In one embodiment of the invention, a corrosive medium pump 13 is further included. The corrosive medium pump 13 is connected to the corrosive medium inlet 3 via a first pipeline 14; a first valve 15 is installed on the first pipeline 14; the corrosive medium outlet 4 is connected to a second pipeline 16, and a second valve 17 is installed on the second pipeline 16. The corrosive medium pump 13 is located outside the double-layer corrosion tank for easy maintenance and repair. Figure 1 As shown, the corrosive medium pump 13 outputs the corrosive medium through the reciprocating motion of the medium pump piston 131.

[0032] In one embodiment of the invention, a liquid level sensor is also included. The liquid level sensor is disposed on the underside of the corrosion tank cover 7 and is used to detect the height of the liquid level in the second space. For example, the liquid level sensor can be an ultrasonic liquid level sensor. An ultrasonic liquid level sensor calculates the liquid level height by emitting ultrasonic waves and receiving the time difference of the reflected waves; it is a non-contact measurement method suitable for highly corrosive media.

[0033] In one embodiment of the invention, a temperature sensor disposed in the second space may be included to monitor the temperature of the corrosive medium in the second space. When the temperature sensor detects that the temperature of the corrosive medium is higher than a set value, the flow rate of the temperature-controlled medium can be reduced or the temperature of the temperature-controlled medium can be lowered to cool down the corrosive medium; when the temperature sensor detects that the temperature of the corrosive medium is lower than the set value, the flow rate of the temperature-controlled medium can be increased or the temperature of the temperature-controlled medium can be raised to heat up the corrosive medium. Through this feedback control method, precise temperature control in the second space can be achieved.

[0034] The multifunctional stress corrosion experimental device provided by this invention solves the technical problems of large stress error when ordinary fixtures apply stress to experimental samples in stress corrosion experiments, difficulty in acquiring corrosion electrochemical data under stress, lack of multi-factor coupled corrosion experimental devices such as small stress-temperature environment-electrochemical, and reproduction of gas-liquid and gas-liquid alternating corrosion conditions. It has the advantages of high precision in experimental condition control, comprehensive coupling of multi-factor corrosion conditions, simple structure, and strong practicality.

[0035] The device provided by this invention can simulate various working conditions. The specific working conditions are further explained below.

[0036] Static immersion corrosion test: First, install the sample to be tested 100 onto the sample clamping part of the sample holder 8, ensuring that the sample to be tested 100 is firmly fixed. Then, connect the corrosion tank cover 7 to the double-layer corrosion tank, install the sealing ring, and ensure good sealing. Open the first valve 15 and the second valve 17, start the corrosion medium pump 13, and the corrosion medium is drawn from the corrosion medium storage tank and enters the second space through the first pipeline 14 and the corrosion medium inlet 3. The liquid level of the corrosion medium is monitored in real time by the liquid level sensor. When the liquid level of the corrosion medium exceeds the sample to be tested 100, stop the corrosion medium pump 13, close the first valve 15 and the second valve 17, and at this time, the corrosion medium fills the second space and immerses the sample to be tested 100, and the static immersion corrosion test of the sample to be tested 100 is carried out. After the experiment, open the first valve 15 and the second valve 17, start the corrosion medium pump 13, and the corrosion medium is drawn out through the corrosion medium outlet 4 and the second pipeline 16, returning to the corrosion medium storage tank or being discharged into the waste liquid container. After the corrosive medium is drained, the sample to be tested is taken out for characterization and analysis, thus completing the static immersion corrosion experiment.

[0037] Stress corrosion test conditions: Based on the static immersion corrosion test conditions, stress loading is applied. First, the sample to be tested 100 is installed on the sample clamping part of the sample holder 8. Then, the stress loading controller 10 is turned on, and the material properties and experimental parameters of the sample to be tested 100, including the cross-sectional dimensions, elastic modulus, yield strength, and target stress value, are input into the stress loading controller 10. The stress loading controller 10 calculates the running distance of the stress loading screw 9 according to the input parameters and controls the stress loading screw 9 to move slowly downward. The lower end of the stress loading screw 9 abuts against the sample to be tested 100 and deforms, applying the preset stress. After stress loading is completed, the position of the stress loading screw 9 is kept unchanged, and the corrosion medium pump 13 is started according to the method in the static immersion corrosion test conditions to output the corrosion medium from the corrosion medium storage tank to the second space for immersion corrosion experiment. During the experiment, the stress loading controller 10 can monitor the stress on the stress loading screw 9 in real time and adjust it as needed. After the experiment was completed, the stress-loading screw 9 was rotated in the opposite direction to unload the stress. Then, the sample to be tested was taken out for characterization and analysis, thus completing the stress corrosion experiment.

[0038] Electrochemical stress corrosion testing: Based on the stress corrosion experimental conditions, an electrode assembly is installed for electrochemical testing. The reference electrode 11 and counter electrode 12 are installed through the electrode holes on the corrosion tank cover 7, ensuring the electrodes are inserted into the corrosive medium and fixed in position. The stress loading screw 9 serves as the working electrode, forming a three-electrode electrochemical system after contacting the sample 100. The contact area between the sample holder 8 and the sample 100 is insulated using an insulating coating or insulating gasket to isolate the current. The surface of the sample 100 is insulated with paraffin wax, reserving a fixed area for testing to ensure only the testing area is exposed to the corrosive medium. The first valve 15 and the second valve 17 are opened, and the corrosive medium pump 13 is started. After the sample 100 is immersed in the corrosive medium, the system is allowed to stabilize, typically requiring a period of time for the electrode potential to stabilize. When testing the polarization curve, the potential of the working electrode relative to the reference electrode 11 is changed at a certain scan rate, and the current change is recorded to obtain the polarization curve. When testing the impedance spectrum, a small-amplitude AC signal is applied to the working electrode, and the impedance changes with frequency to obtain the impedance spectrum.

[0039] Corrosion test conditions at the vapor-liquid interface: In some cases, corrosion near the top of the corrosive medium is often more severe than corrosion in areas completely immersed in the corrosive medium. To simulate the corrosion environment under this condition, it is necessary to control the distance between the test sample and the surface of the corrosive medium, ensuring they are close but not in contact. Under any of the above conditions, the height of the corrosive medium level is precisely controlled by controlling the operation of the corrosive medium pump 13 and monitoring the level sensor. Specifically, the corrosive medium pump 13 is started, and the corrosive medium is slowly pumped into the second space, while the level sensor monitors the level in real time. When the corrosive medium level reaches a preset position, this preset position maintains a preset distance (e.g., 1cm-5cm) between the corrosive medium level and the test sample 100, but without contact. Then, the first valve 15 and the second valve 17 are closed, maintaining the liquid level, and the vapor-liquid interface corrosion test of the test sample 100 is conducted. This condition simulates the corrosion behavior of the test material in a humid environment.

[0040] Tidal Corrosion Condition with Alternating Wet and Dry Motion: Under any of the above conditions, the reciprocating motion of the corrosive medium pump 13, in conjunction with feedback from the liquid level sensor, controls the rise and fall of the corrosive medium level. Specifically, the corrosive medium pump 13 is set to reciprocate according to a set time cycle. When the corrosive medium pump 13 operates in the forward direction, the corrosive medium is pumped into the second space, and the liquid level rises; when the corrosive medium pump 13 operates in the reverse direction, the corrosive medium is extracted from the second space, and the liquid level falls. The actual liquid level signal monitored by the liquid level sensor causes the liquid level to change according to a preset pattern, realizing the alternating immersion and exposure states of the sample 100 in the corrosive medium, simulating the tidal corrosion condition of ocean waves. In the immersion stage, the sample 100 is completely submerged in the corrosive medium; in the exposure stage, the sample 100 is exposed to the gaseous environment, and a thin liquid film forms on its surface. This alternating wet and dry condition accelerates the corrosion rate, more realistically simulating corrosion behavior in a marine environment, and is suitable for corrosion experiments on equipment operating at sea or on reefs, or materials used to manufacture such equipment.

[0041] Corrosion conditions under different ambient temperatures: Under any of the above conditions, temperature-controlled media of varying temperatures and flow rates are injected into the first space through the temperature-controlled media inlet, thereby adjusting the temperature of the corrosive medium in the second space. A temperature sensor can be installed in the second space (e.g., on the inner wall or cover of the corrosion tank). Based on the temperature signal fed back from the temperature controller, the flow rate or temperature of the temperature-controlled media is adjusted to stabilize the temperature of the corrosive medium at a set value. For example, in high-temperature corrosion experiments, a higher-temperature temperature-controlled media, such as hot oil, is injected; in low-temperature corrosion experiments, a lower-temperature temperature-controlled media, such as cooling water, is injected. In this way, corrosion experiments can be conducted at any temperature point within the range from low to high temperatures to study the effect of temperature on corrosion behavior.

[0042] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A multifunctional stress corrosion testing apparatus, characterized in that, It includes a double-layer corrosion tank, which comprises an outer corrosion tank wall and an inner corrosion tank wall; A first space is formed between the outer corrosion tank wall and the inner corrosion tank wall to contain the temperature control medium; the inner corrosion tank wall encloses a second space. The double-layer corrosion tank is provided with a corrosion medium inlet and a corrosion medium outlet. Both the corrosion medium inlet and the corrosion medium outlet penetrate the outer corrosion tank wall and the inner corrosion tank wall, and communicate with the second space. The outer corrosion tank wall is provided with a temperature-controlled medium inlet and a temperature-controlled medium outlet that communicate with the first space. The upper end of the double-layer corrosion pool is provided with a corrosion pool cover plate, and the corrosion pool cover plate is provided with a sample support and a stress loading component; the sample support is used to fix the sample to be tested, and the stress loading component is used to apply a preset stress to the sample to be tested.

2. The multifunctional stress corrosion testing apparatus according to claim 1, characterized in that, The sample holder is fixed to the lower side of the corrosion tank cover plate, and the sample holder extends into a preset position within the second space.

3. The multifunctional stress corrosion testing apparatus according to claim 2, characterized in that, The stress loading assembly includes a stress loading screw and a stress loading controller for controlling the stress loading screw; the stress loading screw passes through the corrosion tank cover plate for contacting the sample to be tested, and the stress loading controller is fixedly installed on the upper side of the corrosion tank cover plate.

4. The multifunctional stress corrosion testing apparatus according to claim 3, characterized in that, It also includes an electrode assembly, which comprises a reference electrode, a reference electrode, and a working electrode; The reference electrode and the counter electrode are disposed through the corrosion tank cover plate, and the working electrode is the stress loading screw.

5. The multifunctional stress corrosion testing apparatus according to claim 1, characterized in that, It also includes a corrosive medium pump, which is connected to the corrosive medium inlet via a first pipeline; a first valve is installed on the first pipeline. The corrosive medium outlet is connected to a second pipeline, and a second valve is installed on the second pipeline.

6. The multifunctional stress corrosion testing apparatus according to claim 1, characterized in that, It also includes a liquid level sensor, which is located on the underside of the corrosion tank cover and is used to detect the height of the liquid level in the second space.

7. The multifunctional stress corrosion testing apparatus according to claim 1, characterized in that, The corrosion tank cover is connected to the upper part of the double-layer corrosion tank by threads or flanges.

8. The multifunctional stress corrosion testing apparatus according to claim 1, characterized in that, The temperature-controlled medium inlet is located on the bottom side of the outer corrosion tank wall, and the temperature-controlled medium outlet is located on the top side of the outer corrosion tank wall. The corrosive medium inlet is located on the bottom side of the double-layer corrosion tank, and the corrosive medium outlet is located on the top side of the double-layer corrosion tank.

9. The multifunctional stress corrosion testing apparatus according to claim 1, characterized in that, The temperature control medium includes silicone oil or water.

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