Four-point bending hydrogen embrittlement resistance testing system and method

Abstract

The invention discloses a four-point bending hydrogen embrittlement resistance testing system which comprises a testing container, a central adjusting device, an image obtaining device and a four-point bending device. The test container contains a test solution with a preset pH value, and a test object is loaded in the four-point bending device; the central adjusting device comprises an automatic pH value adjusting part, a pH value testing part and a pH adjusting solution adding part; the automatic pH value adjusting part is used for controlling the adjusting solution adding part to add an adjusting solution into a testing solution when the current pH value deviates from a normal value and is greater than a preset threshold value; the image acquisition device is arranged facing the test object to acquire a real-time image of the test object, acquires a fracture image at the fracture moment of the test object, and transmits the real-time image and the fracture image to a preset terminal. The system can automatically adjust the pH value of the solution on the basis that the temperature of the solution is stable so as to accurately evaluate the hydrogen embrittlement resistance, and the test cost is lower. The invention further discloses a four-point bending hydrogen embrittlement resistance testing method.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen-induced delayed cracking detection, and in particular relates to a four-point bending hydrogen embrittlement resistance testing system and method. Background Art

[0002] The generation of hydrogen embrittlement is the result of the combined effects of factors such as the service environment, stress distribution, and material properties. Among them, the service environment determines the amount of hydrogen penetration into the matrix, the stress distribution determines the segregation state of hydrogen elements in the matrix, and the material properties determine the diffusion capacity of hydrogen within the material. Currently, ultra-high-strength steels used in automobiles, such as hot-formed steels above 1500MPa grade, are more prone to hydrogen-induced cracking in hydrogen-containing environments due to their material properties. Accelerated test methods are generally used to test the sensitivity to hydrogen-induced cracking, such as the slow strain rate method, the constant load method, and the four-point bending static immersion method. Among them, the four-point bending static immersion method is simple and easy to implement, and is therefore a method that is currently widely used in the automotive industry.

[0003] Specifically, the four-point bending static immersion method uses a hydrochloric acid solution with a pH of 1. The solution must be replaced every 24 hours to ensure the pH value of the solution. However, the timeliness of this method is at least 120 hours, which requires more work and testing costs for the test personnel. In order to reduce manual participation, there is a corrosion test container in the prior art that automatically adjusts the pH value of the solution. However, the device needs to be stirred after adding acid and alkali, and the solution is stirred, which introduces erosion. This significantly increases the uncertainty of the test results. At different temperatures, the pH of the same solution with the same pH value may be different. + The mobility and diffusion rates of the substances are also different, which can lead to inaccurate results in the measured hydrogen embrittlement resistance. Therefore, how to automatically adjust the pH value of the solution while maintaining a stable solution temperature during the test to improve the accuracy of the hydrogen embrittlement resistance evaluation is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] To solve the above problems, the present invention provides a four-point bending hydrogen embrittlement resistance testing system and method, which can automatically adjust the pH value of the solution to accurately evaluate the hydrogen embrittlement resistance while ensuring the stability of the solution temperature. It does not require human supervision, and the test process is simpler, the amount of acid used is reduced, and the testing cost is lower.

[0005] The present invention provides a four-point bending hydrogen embrittlement resistance test system, comprising a test container, a central adjustment device, an image acquisition device and a four-point bending device;

[0006] The test container is used to hold a test solution with a preset pH value, and the four-point bending device is immersed in the test solution, and the four-point bending device is loaded with a test object;

[0007] The central regulating device includes a pH automatic regulating component and a pH testing component and a pH regulating liquid adding component in communication with the pH testing component, wherein the pH testing component is used to obtain the current pH value of the test solution and transmit it to the pH automatic regulating component, and the pH automatic regulating component is used to control the regulating liquid adding component to add regulating liquid to the test solution when the current pH value deviates from the normal value by more than a preset threshold value;

[0008] The image acquisition device is arranged facing the test object to acquire a real-time image of the test object, and automatically acquires a fracture image when the test object fractures, and is communicatively connected to a preset terminal to transmit the real-time image and the fracture image to the preset terminal.

[0009] Preferably, in the above-mentioned four-point bending hydrogen embrittlement resistance test system, the test container is a constant temperature test container, and the central adjustment device includes a temperature adjustment component, which is connected to a temperature sensor, a heating element and a cooling element. The temperature sensor, the heating element and the cooling element are all in contact with the test solution in the container. The temperature adjustment component is used to receive the test solution temperature value sensed by the temperature sensor, and to start the heating element when the test solution temperature value is lower than a preset low value, and to start the cooling element when the test solution temperature value is higher than a preset high value.

[0010] Preferably, in the above-mentioned four-point bending hydrogen embrittlement resistance test system, the regulating liquid adding component includes a regulating liquid container and a regulating liquid pipeline, the first end of the regulating liquid pipeline is connected to the regulating liquid inside the regulating liquid container, and the second end of the regulating liquid pipeline is connected to the test container, and a power component is provided in the regulating liquid pipeline, and the power component is communicatively connected to the central regulating device, and the central regulating device is used to turn on the power component when the current pH value deviates from the normal value by more than a preset threshold value to transport the regulating liquid in the regulating liquid container to the test container through the regulating liquid pipeline.

[0011] Preferably, in the above-mentioned four-point bending hydrogen embrittlement resistance test system, the power component is a peristaltic pump with a speed regulation module, the speed regulation module is communicatively connected to the central regulation device, and the central regulation device is also used to control the speed of the speed regulation module according to the difference between the current pH value and the normal value, so that the peristaltic pump can peristalsize at a corresponding speed.

[0012] Preferably, in the above four-point bending hydrogen embrittlement resistance test system, the pH value testing component is a pH meter electrode, and is suspended downward from above the liquid surface of the test solution and extended into the test solution.

[0013] Preferably, in the above-mentioned four-point bending hydrogen embrittlement resistance test system, the test container is also equipped with an ultrasonic debubbler, which is communicatively connected to the central adjustment device, and the central adjustment device is used to control the action of the ultrasonic debubbler to remove bubbles in the test container.

[0014] Preferably, in the above four-point bending hydrogen embrittlement resistance testing system, the image acquisition device is a camera.

[0015] Preferably, in the above four-point bending hydrogen embrittlement resistance test system, the preset terminal is a mobile terminal and / or a PC terminal.

[0016] Preferably, in the above four-point bending hydrogen embrittlement resistance testing system, the image acquisition device and the preset terminal are connected by wireless communication.

[0017] The present invention provides a four-point bending hydrogen embrittlement resistance testing method, which utilizes the four-point bending hydrogen embrittlement resistance testing system as described in any one of the above items, comprising:

[0018] Prepare a test solution and a regulating solution with a preset pH value, and place the regulating solution into a pH regulating solution adding component;

[0019] Mounting the test object on a four-point bending apparatus and applying the required stress, and placing the test object in the test solution;

[0020] acquiring an initial image of the test object using the image acquisition device, and placing the test solution into a test container;

[0021] Automatically adjusting the pH value of the test solution using the pH automatic adjustment component in the central adjustment device;

[0022] The image acquisition device is used to record the entire image of the test object and take a photo at regular intervals until a fracture occurs or a preset time threshold is reached. When a fracture occurs, the image acquisition device automatically obtains the fracture occurrence time and fracture image and transmits them to the preset terminal.

[0023] It can be seen from the above description that the above-mentioned four-point bending hydrogen embrittlement resistance test system provided by the present invention includes a test container, a central adjustment device, an image acquisition device and a four-point bending device; the test container is used to hold a test solution with a preset pH value, and the four-point bending device is immersed in the test solution, and the four-point bending device is loaded with a test object; the central adjustment device includes a pH value automatic adjustment component and a pH value testing component and a pH adjustment liquid adding component connected to the communication with the central adjustment device, the pH value testing component is used to obtain the current pH value of the test solution and transmit it to the pH value automatic adjustment component, and the pH value automatic adjustment component is used to adjust the current pH value deviating from the normal pH value. When the value is greater than a preset threshold, the regulating liquid adding component is controlled to add regulating liquid to the test solution; the image acquisition device is arranged facing the test object to obtain a real-time image of the test object, and automatically obtains a fracture image at the moment of fracture of the test object, and is connected to a preset terminal for communication to transmit the real-time image and the fracture image to the preset terminal. It can be seen that this can avoid large fluctuations in pH value, and the image acquisition device is used instead of manual monitoring. Therefore, on the basis of ensuring the stability of the solution temperature, the pH value of the solution can be automatically adjusted to accurately evaluate the hydrogen embrittlement resistance, and no personnel are required to be on duty, and the test process is simpler, the amount of acid used is reduced, and the test cost is lower. The above-mentioned four-point bending hydrogen embrittlement resistance test method provided by the present invention has the same advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of an embodiment of a four-point bending hydrogen embrittlement resistance testing system provided by the present invention;

[0026] Figure 2 This is a control connection diagram of the four-point bending hydrogen embrittlement resistance test system;

[0027] Figure 3 This is a schematic diagram of an embodiment of a four-point bending hydrogen embrittlement resistance testing method provided by the present invention. DETAILED DESCRIPTION

[0028] The core of the present invention is to provide a four-point bending hydrogen embrittlement resistance testing system and method. On the basis of ensuring the stability of the solution temperature, the pH value of the solution can be automatically adjusted to accurately evaluate the hydrogen embrittlement resistance. Moreover, no human supervision is required, the test process is simpler, the amount of acid used is reduced, and the testing cost is lowered.

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0030] The embodiment of the four-point bending hydrogen embrittlement resistance test system provided by the present invention is as follows: Figure 1 As shown, Figure 1 Schematic diagram of an embodiment of a four-point bending hydrogen embrittlement resistance testing system provided by the present invention. The embodiment of the four-point bending hydrogen embrittlement resistance testing system may include a test container 1, a central adjustment device 2, an image acquisition device 3, and a four-point bending device 4;

[0031] The test container 1 is used to hold a test solution having a preset pH value, and the four-point bending device 4 is immersed in the test solution. A test object 5 is loaded in the four-point bending device 4. In this case, the test object 5 can be completely immersed in the test solution during the four-point bending, thereby realizing the four-point bending hydrogen embrittlement resistance test. Multiple test objects 5 can be placed simultaneously for static immersion.

[0032] The central regulating device 2 includes an automatic pH regulating component 21, a pH testing component 22 and a pH regulating liquid adding component 23 in communication therewith. The central regulating device 2 may employ a PLC controller. The pH testing component 22 is used to obtain the current pH value of the test solution and transmit it to the automatic pH regulating component 21. The automatic pH regulating component 21 is used to control the regulating liquid adding component 23 to add regulating liquid to the test solution when the current pH value deviates from the normal value by more than a preset threshold. The regulating liquid for replenishment is placed inside the regulating liquid adding component 23, for example, an acid having a lower pH value than the test solution. When the current pH value of the test solution increases significantly, a corresponding amount of regulating liquid may be added to reduce the pH value of the test solution to the desired value.

[0033] The image acquisition device 3 is arranged facing the test object 5 to acquire a real-time image of the test object 5, so that the condition of the test object 5 can be monitored in real time. It can be viewed remotely through the Internet of Things and automatically acquire a fracture image at the moment of fracture of the test object 5. The device is connected to a preset terminal to transmit the real-time image and the fracture image to the preset terminal. It should be noted that at the moment of fracture, the image undergoes a significant change, which can be perceived in real time by the image acquisition device 3. At this time, controlling the acquisition of the image eliminates the need for relevant personnel to be on duty at all times, greatly reducing the manpower cost required for the test. Moreover, recording the fracture moment at this time can facilitate the subsequent calculation process. The timely transmission of relevant images and data to the preset terminal can ensure that relevant personnel quickly obtain information, thereby facilitating timely response measures. The image acquisition device 3 can preferably be a camera, and the preset terminal can preferably be a mobile terminal 6 and / or a PC terminal 7. The image acquisition device 3 and the preset terminal 6 or 7 are preferably connected by wireless communication, which can achieve better remote monitoring and control. The entire test process can be recorded or photographed, and the fracture time of each sample can be accurately found. There is no need for test personnel to go to the laboratory to check the test status at regular intervals, simplifying the test process, and the MCGS touch screen can be used on site for corresponding control. In a specific example, the PLC can be connected to an IoT touch screen installed with MCGS configuration software. After installing an IoT card using the 4G interface of the IoT touch screen, the system can be viewed and controlled through the IoT Assistant app on a mobile phone. At the same time, a TP-LINK high-definition network camera can be installed to record the entire test process. The fracture time and fracture status of the specimen can be recorded by mobile phone and by reviewing the video.

[0034] From the above description, it can be seen that in the embodiment of the above-mentioned four-point bending hydrogen embrittlement resistance test system provided by the present invention, it includes a test container, a central adjustment device, an image acquisition device and a four-point bending device; the test container is used to hold a test solution with a preset pH value, and the four-point bending device is immersed in the test solution, and the four-point bending device is loaded with a test object; the central adjustment device includes a pH value automatic adjustment component and a pH value testing component and a pH adjustment liquid adding component connected to the communication therewith, the pH value testing component is used to obtain the current pH value of the test solution and transmit it to the pH value automatic adjustment component, and the pH automatic adjustment component is used to adjust the current pH value when it deviates from the normal value. When the constant value is greater than a preset threshold, the regulating liquid adding component is controlled to add the regulating liquid to the test solution; the image acquisition device is set facing the test object to obtain a real-time image of the test object, and automatically obtains a fracture image at the moment of fracture of the test object, and is connected to a preset terminal for communication to transmit the real-time image and the fracture image to the preset terminal. It can be seen that this can avoid large fluctuations in the pH value, and the image acquisition device is used instead of manual monitoring. Therefore, on the basis of ensuring the stability of the solution temperature, the pH value of the solution can be automatically adjusted to accurately evaluate the hydrogen embrittlement resistance, and no personnel are required to be on duty, and the test process is simpler, the amount of acid used is reduced, and the testing cost is lower.

[0035] In a specific embodiment of the above four-point bending hydrogen embrittlement resistance test system, reference Figure 2 , Figure 2 2 is a control connection diagram of a four-point bending hydrogen embrittlement resistance test system. The test container 1 may preferably be a constant temperature test container. The central regulating device 2 may include a temperature regulating component 25. The temperature regulating component 25 is connected to a temperature sensor 26, a heating element 27 and a cooling element 28. The temperature sensor 26, the heating element 27 and the cooling element 28 are all in contact with the test solution in the test container 1. The temperature regulating component 25 is used to receive the test solution temperature sensed by the temperature sensor 26, and to start the heating element 27 when the test solution temperature is lower than a preset low value, and to start the cooling element 28 when the test solution temperature is higher than a preset high value. It should be noted that the heating element can be a resistance heating element, and the cooling element can be a semiconductor refrigeration sheet to ensure a sufficiently good cooling effect. Of course, other types of heating and cooling elements can be selected according to actual needs. There is no restriction here. By using the combination of these components, the constant temperature of the test container can be maintained in real time without human operation. Specifically, any temperature between 10°C and 50°C can be controlled to maintain, so that the entire test process is in a constant temperature state, there will be no temperature variables, the control accuracy of the pH value of the solution is improved, and the test results are not affected by the ambient temperature, making the results more accurate.

[0036] In another specific embodiment of the above four-point bending hydrogen embrittlement resistance test system, continue to refer to Figure 1 and Figure 2 The regulating liquid adding component 23 may include a regulating liquid container 231 and a regulating liquid pipeline 232. The first end of the regulating liquid pipeline 232 is connected to the regulating liquid in the regulating liquid container 231, and the second end of the regulating liquid pipeline 232 is connected to the test container 1. The regulating liquid pipeline 232 may be provided with a power component 29. The power component 29 is communicatively connected to the central regulating device 2. The central regulating device 2 is configured to activate the power component 29 when the current pH value deviates from the normal value by more than a preset threshold value, thereby transferring the regulating liquid in the regulating liquid container 231 to the test container 1 through the regulating liquid pipeline 232. In a specific example, when the pH value is detected to have risen to a certain level, the power component 29 is activated to add an appropriate amount of regulating liquid to the test container 1. After mixing, the pH value can be lowered to an appropriate level, thereby maintaining a constant pH value. The power component 29 may preferably be a peristaltic pump, which is low-cost and easy to operate. Of course, other types of power components can also be selected according to actual needs, and this is not limited here. Furthermore, the power component 29 can preferably be a peristaltic pump with a speed regulation module. The speed regulation module is communicatively connected to a central control device. The central control device is further configured to control the speed of the speed regulation module based on the deviation of the current pH value from the normal value, so that the peristaltic pump peristalsis at a corresponding speed. Specifically, when the pH value deviates slightly, the speed can be set to a lower speed, and vice versa. This allows for more precise pH control and avoids the problem of over-regulation.

[0037] In a preferred embodiment of the four-point bend hydrogen embrittlement resistance testing system, the pH test component 22 is preferably a pH meter electrode, suspended from above the test solution surface and extending downward into the test solution. This pH meter electrode is a common product with automatic temperature compensation, consisting of a temperature sensor, a pH sensor, and a reference electrode. It can be used to obtain accurate pH values, providing a precise basis for pH stability.

[0038] During the hydrogen embrittlement resistance test, the test object needs to be immersed in a hydrochloric acid solution with a pH of 1 for a long time. The hydrochloric acid solution will react chemically with the test solution to produce gas, resulting in many bubbles remaining on the side walls of the solution tank. Bubbles will also appear on the surface of the test object, especially for test objects with coatings and high hydrogen embrittlement sensitivity. This will affect the observation of the test object. Based on this situation, in another preferred embodiment of the above-mentioned four-point bending hydrogen embrittlement resistance test system, the test container 1 is also equipped with an ultrasonic defoamer 210, which can be installed at the bottom of the test container near the observation surface, on the inner wall of the test container, at the bottom of the test container, or placed in the test solution. The ultrasonic defoamer 210 is communicatively connected to the central adjustment device 2, and the central adjustment device 2 is used to control the action of the ultrasonic defoamer 210 to remove bubbles in the test container 1. It should be noted that after the ultrasonic defoamer 210 is working, the vibration generated can eliminate bubbles attached to the wall of the test container, the test object and the fixture. For example, the ultrasonic defoamer can be operated once at 0.5h, 1h, 2h, 5h, and 10h after the start of the test, and then once every 24h to achieve the purpose of not affecting the observation. In this way, on the basis of constant pH value and temperature, it is ensured that bubbles will not have an adverse effect on the test process. Of course, other defoaming methods can also be used, which are not limited here.

[0039] The embodiment of the four-point bending hydrogen embrittlement resistance test method provided by the present invention is as follows: Figure 3 As shown, Figure 3 This is a schematic diagram of an embodiment of a four-point bending hydrogen embrittlement resistance test method provided by the present invention. Using any of the above four-point bending hydrogen embrittlement resistance test systems, the method may include the following steps:

[0040] S1: Prepare a test solution and a regulating solution with a preset pH value, and place the regulating solution into a pH regulating solution adding component;

[0041] It should be noted that the pH value of the regulating solution should be lower than the pH value of the test in order to achieve the function of regulating the pH value.

[0042] S2: Mount the test object on a four-point bending device and apply the required stress, then place it in the test solution.

[0043] It should be noted that the test object can be polished in advance and then mounted on a four-point bending fixture to load a certain bending stress so that it remains in a bent state. The target pH value and the temperature of the solution in the test container must also be set.

[0044] S3: Acquire an initial image of the test object using an image acquisition device and place a test solution into a test container;

[0045] Specifically, the position of the image acquisition device can be adjusted in advance to ensure that all loaded specimens are monitored, the monitoring area can be set, and then photos can be taken before the test begins.

[0046] S4: Automatically adjust the pH value of the test solution using the pH automatic adjustment component in the central adjustment device;

[0047] It should be noted that this step does not require human operation.

[0048] S5: Use an image acquisition device to record the entire image of the test object and take a photo at regular intervals until a fracture occurs or a preset time threshold is reached. When a fracture occurs, the image acquisition device automatically acquires the fracture occurrence time and fracture image and transmits them to a preset terminal.

[0049] It should be noted that after the test object breaks or reaches the required immersion time, the system power is turned off to store all data, the waste liquid is collected, the unbroken specimens are disassembled, and subsequent data processing is carried out.

[0050] The above system and method are described below with a specific example:

[0051] For example, to test the hydrogen embrittlement resistance of 1500MPa grade hot-formed steel with a yield strength of 1150MPa, the test conditions are as follows: using a four-point bending fixture, applying a stress of 100% of the yield strength to the specimen, immersing it in a hydrochloric acid solution with a pH of 1 for 120 hours at a temperature of 26°C, and using three replicate samples. One implementation method is as follows:

[0052] 1) Prepare 5 L of hydrochloric acid solution with a pH of 1 and 500 mL of hydrochloric acid solution with a pH of 0.5. Calculate the deflection corresponding to the specimen loading stress to be 8 mm. Load all specimens and stack them in a constant temperature solution tank, with the specimens facing the camera.

[0053] 2) Set the target pH value to 1. When the solution pH is ≥1.2, the peristaltic pump starts and adds high-concentration hydrochloric acid solution to the solution. When the pH is ≤1, the peristaltic pump stops. The thermostat temperature is set to 26°C, and the ultrasonic defoamer operates for 30 seconds every 30 minutes.

[0054] 3) Adjust the camera so that the entire sample is within the detection range, record the entire test process, and take a photo every 2 hours for later data processing to quickly find the time point of sample fracture.

[0055] 4) Pour in hydrochloric acid solution with pH=1 and the test will start until all the specimens break or 120 hours have passed.

[0056] 5) During the test, the fracture status of the specimen can be checked through the mobile app.

[0057] 6) If the equipment cannot be shut down in time after the test, the power supply of the constant temperature solution pH automatic adjustment system can be remotely turned off through the mobile app to protect the equipment and save energy.

[0058] 7) Collect the waste liquid, remove the four-point bending fixture, disassemble the unbroken specimen, and clean the specimen and fixture.

[0059] 8) View the stored photos and videos to obtain the fracture time and corresponding photos of each specimen.

[0060] The above variables can be flexibly adjusted according to test requirements and have a wide range of applications.

[0061] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A four-point bending hydrogen embrittlement resistance testing system, characterized in that: It includes a test container, a central adjustment device, an image acquisition device and a four-point bending device; The test container is used to hold a test solution with a preset pH value, and the four-point bending device is immersed in the test solution, and the four-point bending device is loaded with a test object; The central regulating device includes a pH automatic regulating component and a pH testing component and a pH regulating liquid adding component in communication with the pH testing component, wherein the pH testing component is used to obtain the current pH value of the test solution and transmit it to the pH automatic regulating component, and the pH automatic regulating component is used to control the regulating liquid adding component to add regulating liquid to the test solution when the current pH value deviates from the normal value by more than a preset threshold value; The image acquisition device is arranged facing the test object to acquire a real-time image of the test object, and automatically acquires a fracture image when the test object fractures, and is communicatively connected to a preset terminal to transmit the real-time image and the fracture image to the preset terminal.

2. The four-point bending hydrogen embrittlement resistance testing system according to claim 1, characterized in that: The test container is a constant temperature test container, and the central regulating device includes a temperature regulating component, which is connected to a temperature sensor, a heating element, and a cooling element. The temperature sensor, the heating element, and the cooling element are all in contact with the test solution in the container. The temperature regulating component is used to receive the test solution temperature value sensed by the temperature sensor, and to activate the heating element when the test solution temperature value is lower than a preset low value, and to activate the cooling element when the test solution temperature value is higher than a preset high value.

3. The four-point bending hydrogen embrittlement resistance testing system according to claim 1, characterized in that: The regulating liquid adding component includes a regulating liquid container and a regulating liquid pipeline. The first end of the regulating liquid pipeline is connected to the regulating liquid inside the regulating liquid container, and the second end of the regulating liquid pipeline is connected to the test container. A power component is provided in the regulating liquid pipeline. The power component is communicatively connected to the central regulating device, and the central regulating device is used to activate the power component when the current pH value deviates from the normal value by more than a preset threshold value to transport the regulating liquid in the regulating liquid container to the test container through the regulating liquid pipeline.

4. The four-point bending hydrogen embrittlement resistance testing system according to claim 3, characterized in that: The power component is a peristaltic pump with a speed regulation module, and the speed regulation module is communicatively connected to the central regulation device. The central regulation device is also used to control the speed of the speed regulation module according to the difference between the current pH value and the normal value, so that the peristaltic pump can peristalsize at a corresponding speed.

5. The four-point bending hydrogen embrittlement resistance testing system according to claim 1, characterized in that: The pH value testing component is a pH meter electrode, and is suspended downward from above the liquid surface of the testing solution and extends into the testing solution.

6. The four-point bending hydrogen embrittlement resistance testing system according to claim 1, characterized in that: The test container is further equipped with an ultrasonic defoamer, which is communicatively connected to the central regulating device. The central regulating device is used to control the action of the ultrasonic defoamer to remove bubbles in the test container.

7. The four-point bending hydrogen embrittlement resistance testing system according to claim 1, characterized in that: The image acquisition device is a camera.

8. The four-point bending hydrogen embrittlement resistance testing system according to claim 7, characterized in that: The preset terminal is a mobile terminal and / or a PC terminal.

9. The four-point bending hydrogen embrittlement resistance testing system according to claim 8, characterized in that: The image acquisition device and the preset terminal are connected by wireless communication.

10. A four-point bending hydrogen embrittlement resistance test method, characterized in that: The four-point bending hydrogen embrittlement resistance testing system according to any one of claims 1 to 9 comprises: Prepare a test solution and a regulating solution with a preset pH value, and place the regulating solution into a pH regulating solution adding component; Mounting the test object on a four-point bending apparatus and applying the required stress, and placing the test object in the test solution; acquiring an initial image of the test object using the image acquisition device, and placing the test solution into a test container; Automatically adjusting the pH value of the test solution using the pH automatic adjustment component in the central adjustment device; The image acquisition device is used to record the entire image of the test object and take a photo at regular intervals until a fracture occurs or a preset time threshold is reached. When a fracture occurs, the image acquisition device automatically obtains the fracture occurrence time and fracture image and transmits them to the preset terminal.

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