Total immersion type rotary bending corrosion simulation test method and device

Abstract

The invention relates to a total immersion type rotation bending corrosion simulation test method and device, and belongs to the field of material science. The device comprises a main box, a slave box, a corrosive liquid container, a water pump and a pipeline, wherein the main box is fixedly connected in the slave box without a top cover; the top of the main box is provided with a main box liquid inlet, one side wall is provided with a main box liquid outlet, and the other two opposite side walls are provided with a pair of mutually symmetrical circular holes through which samples pass; a slave box liquid outlet is formed in the slave box bottom; the liquid outlet of the main box is higher than the round hole penetrating through the sample; a liquid inlet of the main box is connected with the corrosive liquid container through a pipeline, a liquid outlet of the auxiliary box is connected with the corrosive liquid container through a pipeline, and corrosive liquid is driven to circulate through a water pump installed in the corrosive liquid container. By adopting the device, the actual application state of the material in the marine environment can be more accurately simulated, and a scientific basis is provided for selection, application and life prediction of the material. The method is accurate and reliable in data, and has a wide application prospect and an important practical value.

Description

Technical Field

[0001] The present invention relates to a rotating bending corrosion fatigue full immersion test method and device, and specifically to a full immersion rotating bending corrosion simulation test method and device, which is intended to provide a test method and device that can accurately simulate a full immersion corrosion environment for industries such as marine engineering, aerospace, and rail transportation, so as to evaluate and study the fatigue performance of metal materials in a state of full immersion in a corrosive medium. The present invention belongs to the field of material science, and specifically to the technical field of corrosion fatigue performance testing of metal materials in a simulated marine environment. Background Art

[0002] In the field of materials science, especially for industries such as marine engineering, aerospace, and rail transportation, corrosion fatigue performance testing of metal materials is a key link to ensure structural reliability and safety. Existing corrosion fatigue test devices usually use spray or drip methods to simulate the corrosive environment, and these devices have certain limitations in structure and process conditions.

[0003] In terms of structure, traditional test devices often lack effective corrosion liquid circulation and control systems, resulting in uneven distribution of the corrosive medium and failure to accurately simulate the real marine environment. In addition, the design of the sample clamping and rotating parts of these devices makes it difficult to achieve full immersion testing of the sample, making it impossible to fully evaluate the actual fatigue performance of the material in the corrosive medium.

[0004] In terms of process conditions, existing test equipment is usually unable to achieve accurate control of parameters such as temperature, pH value and concentration of the corrosive medium, which have a significant impact on the corrosion process and fatigue crack growth behavior. In addition, due to the splash and volatilization of the corrosive liquid, the existing equipment may change the environmental state of the sample during long-term testing, thereby affecting the accuracy of the test results.

[0005] The prior art has the following disadvantages and shortcomings:

[0006] 1. It is impossible to fully immerse the specimen in the test and simulate the fatigue performance of the material in a completely corrosive medium.

[0007] 2. The corrosion liquid circulation and control system is not precise enough, resulting in poor repeatability and controllability of test conditions.

[0008] 3. Lack of precise control over the parameters of the corrosive medium and inability to simulate complex marine environmental conditions.

[0009] 4. The splashing and volatilization of corrosive liquid lead to an unstable test environment, affecting the accuracy and reliability of the data.

[0010] 5. The structure of the test device is complex, the operation is inconvenient, and the maintenance and cleaning work are cumbersome. Summary of the invention

[0011] In view of the above problems existing in the prior art, the present invention has made improvements and provided a rotating bending corrosion fatigue full immersion test device and method.

[0012] The present invention designs a test device with a simple structure and convenient operation, which can realize the full immersion test of the sample in the corrosive medium and avoid the deviation of the test result caused by partial exposure. It solves the problem of splashing and volatilization of the corrosive liquid in the existing test device, ensures the stability of the environmental state of the sample during the test, and improves the accuracy and reliability of the data. It simplifies the structure of the test device, reduces the difficulty of operation, reduces maintenance and cleaning work, and improves the test efficiency.

[0013] The invention provides a rotation bending corrosion fatigue test method and device capable of simulating a real marine environment, and can more accurately evaluate the fatigue performance of metal materials in a corrosive medium.

[0014] The test equipment of the present invention has a simple structure, is easy to operate, can realize full immersion corrosion testing, can effectively improve the accuracy and reliability of the test, and meets the needs of marine engineering and other fields for material corrosion fatigue performance testing.

[0015] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0016] A full immersion rotary bending corrosion simulation test device mainly comprises a main box, a slave box, a corrosive liquid container, a water pump and a pipeline, etc. The main box is fixedly connected in a slave box without a top cover; a main box liquid inlet is provided on the top of the main box, a main box liquid outlet is provided on one side wall, and a pair of symmetrical circular holes for passing a sample are provided on the other two opposite side walls; a slave box liquid outlet is provided on the bottom of the slave box; the height of the main box liquid outlet is higher than the height of the circular hole for passing the sample; the main box liquid inlet is connected to the corrosive liquid container through a pipeline, the slave box liquid outlet is connected to the corrosive liquid container through a pipeline, and the corrosive liquid is driven to circulate by a water pump installed in the corrosive liquid container.

[0017] Furthermore, the master box and the slave box are both in the shape of a cuboid or a cube, the master box is in the shape of a closed cuboid or a cube, and the slave box is in the shape of a cuboid or a cube without a top.

[0018] Furthermore, the main box is bonded inside the topless slave box.

[0019] Furthermore, the lowest point of the liquid outlet of the main box is higher than the highest point of the circular hole passing through the sample, that is, the height of the liquid outlet of the main box is greater than the height of the circular hole of the main box passing through the sample. During the test, the liquid level inside the main box must be maintained at a height that completely immerses the sample.

[0020] Furthermore, the diameter of the circular hole passing through the sample is not greater than 1.2 times the diameter of the sample.

[0021] Furthermore, the master box and the slave box are made of hard non-metallic materials, and the master box and the slave box do not need to be connected (the bottom of the master box is not connected to the bottom of the slave box) while ensuring that the corrosive liquid does not leak during use. The bottom height of the slave box is lower than the bottom height of the master box.

[0022] Furthermore, a splash-proof cover is provided on the top of the main box to prevent the corrosive liquid from splashing and volatilizing.

[0023] Furthermore, the device also includes a filtering device to ensure the cleaning and reuse of the corrosive liquid.

[0024] Furthermore, the device also includes a temperature control and monitoring system to accurately control the temperature of the corrosive medium and simulate different marine environmental conditions.

[0025] In the device, a closed circulation system is formed between the master box, the slave box and the corrosive liquid container. A corrosive liquid circulation system is formed between the master box and the slave box through a pipeline, and the corrosive liquid circulation is driven by a low-power water pump.

[0026] The fully immersed rotating bending corrosion simulation test device of the present invention is mainly composed of a main box, a slave box, a low-power water pump, a filtering device, a corrosive liquid container and a pipeline system. The main box and the slave box are made of hard non-metallic materials to ensure the durability and corrosion resistance of the device. A circular hole is designed inside the main box for passing the sample. The corrosive liquid is injected from the main box liquid inlet at the top, flows out from the main box liquid outlet at the side, flows into the slave box at the bottom, and returns to the corrosive liquid container from the slave box liquid outlet at the bottom, and is injected into the main box again after being processed, forming a full immersion corrosive liquid cycle.

[0027] The present invention designs a rotating bending corrosion fatigue full immersion test device, which includes a main box and a slave box. A splash-proof cover is provided on the top of the main box to prevent the corrosion liquid from splashing and volatilizing. The corrosion liquid is driven to circulate by a low-power water pump to ensure that the sample is tested in a full immersion state. It includes a filtering device and a corrosion liquid container to filter the rust products that may be generated during the test, and the treated corrosion liquid is reused to improve the test efficiency and environmental protection. The temperature of the corrosive medium is accurately controlled by a temperature control and monitoring system to simulate different marine environmental conditions.

[0028] A full immersion rotating bending corrosion simulation test method, the method comprising the following steps:

[0029] Step 1: Prepare the sample. Select appropriate metal material as the sample and process it into standard size and shape according to the test requirements to ensure that the sample can fit into the circular hole in the main box. The diameter of the circular hole in the main box is not greater than 1.2 times the diameter of the sample.

[0030] Step 2: Install the sample: pass the processed sample through the circular hole of the main box and install it in the full immersion rotating bending corrosion fatigue test device;

[0031] Step 3: Inject the corrosive medium into the main box through the main box liquid inlet until the corrosive medium flows out from the main box liquid outlet and the liquid level in the main box reaches a height that completely immerses the sample, ensuring that the sample is completely immersed in the corrosive medium.

[0032] Step 4: Set environmental parameters. According to the test requirements, set the temperature, pH value and concentration of the corrosive medium to simulate specific marine environmental conditions.

[0033] Step 5: Start the circulation system to allow the corrosive medium to circulate between the master box and the slave box to ensure that the sample is continuously and evenly exposed to the corrosive medium;

[0034] Step 6: Apply load, apply rotational bending load to the sample to simulate the stress state under actual working conditions;

[0035] Step 7: Monitor and record data. During the test, use monitoring equipment to record key parameters such as stress, strain, temperature and pH value of the sample;

[0036] Step 8: Evaluate corrosion damage and regularly check the corrosion damage of the specimens, including the formation and expansion of cracks, as well as the corrosion fatigue performance of the material;

[0037] Step 9: End the test and analyze the data. After reaching the predetermined test cycle or the sample fails, stop the test and analyze the collected data to evaluate the corrosion fatigue performance of the sample.

[0038] Through the above technical scheme, the test method and device of the present invention can provide a continuous, stable and cyclic dynamic corrosion environment, meet the test needs of corrosion fatigue performance of various metal materials under the action of rotating bending dynamic force, and provide real and effective test data for its engineering design and fatigue verification.

[0039] Compared with the prior art, the full immersion rotary bending corrosion simulation test method and device of the present invention have the following beneficial effects:

[0040] 1. Full immersion test capability: The device can realize full immersion test of the specimen in the corrosive medium, more realistically simulate the corrosion fatigue behavior of the material in the marine environment, and improve the accuracy and reliability of the test.

[0041] 2. Accurate control of corrosive media: Through a closed circulation system and precise control devices, the present invention can accurately control parameters such as temperature, pH value and concentration of the corrosive media to ensure the consistency and repeatability of the test conditions.

[0042] 3. Prevent splashing and volatilization of corrosive liquid: The designed full immersion test method, the main box with a closed top and the closed circulation system effectively avoid the splashing and volatilization of the corrosive liquid during the test, protect the test environment, and reduce the loss of corrosive liquid.

[0043] 4. Simple structure and easy operation: The design of the device simplifies the test operation, is easy to install and maintain, reduces the difficulty of operation, and improves the test efficiency.

[0044] 5. Accurate and reliable data: Due to the scientific and reasonable design of the device and the stable environment during the test, the corrosion fatigue data obtained is more accurate and reliable, providing an important reference for the engineering application and design of materials.

[0045] 6. Environmental protection and economy: The filter device and the corrosive liquid recycling design reduce the discharge of chemical waste, meet the environmental protection requirements, and reduce the test cost.

[0046] 7. Wide applicability: The device is not only suitable for the field of marine engineering, but can also be expanded to industries such as aerospace, rail transportation, etc. to provide services for corrosion fatigue performance testing of various metal materials.

[0047] 8. Improve test efficiency: The design of the device allows for quick setup and start-up of the test, shortening the test preparation time and improving the overall efficiency of the test.

[0048] 9. Long-term stability: The material selection and structural design of the device ensure stability during long-term testing and reduce test interruptions caused by equipment failure.

[0049] 10. Enhanced safety: The design of splash-proof cover and closed system reduces the risk of operators contacting corrosive media and improves the safety of the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0051] Figure 2 A schematic diagram of installing a sample in the device of the present invention;

[0052] Figure 3 It is a schematic diagram of the use state of the device of the present invention, in which the immersion corrosion solution is being injected into the main box;

[0053] Figure 4 This is a schematic diagram of the use state of the device of the present invention, in which the rotary bending device has been started and a simulation test is being carried out;

[0054] Figure 5 This is a schematic diagram of the test sequence of Example 1 of the present invention;

[0055] Figure 6 This is a schematic diagram of the second test sequence of Example 1 of the present invention;

[0056] Figure 7 Schematic diagram of the test sequence of Example 1 of the present invention.

[0057] Description of main reference numerals:

[0058] 1-main box, 101-main box liquid inlet, 102-main box liquid outlet, 103-circular hole, 2-slave box, 201-slave box liquid outlet, 3-sample, 4-liquid surface. DETAILED DESCRIPTION

[0059] The present invention designs a full-immersion rotary bending corrosion simulation test device, and the overall structural design is: the device is mainly composed of a main box 1, a slave box 2, a low-power water pump, a filtering device, a corrosion liquid container and a pipeline system.

[0060] like Figure 1-2 As shown, the full immersion rotary bending corrosion simulation test device comprises: a main box 1 in the shape of a rectangular parallelepiped, bonded inside a rectangular parallelepiped slave box 2 without a top; a main box liquid inlet 101 is provided on the top of the main box 1, and a main box liquid outlet 102 is provided on the side wall; a pair of mutually symmetrical circular holes 103 for passing through the sample 3 are provided on the other two opposite side walls of the main box 1; the lowest height of the main box liquid outlet 102 is higher than the highest height of the circular hole 103 passing through the sample 3, and the diameter of the circular hole 103 passing through the sample 3 is not higher than 1.2 times the diameter of the sample 3. During the test, the liquid level 4 inside the main box 1 must be maintained at a height that completely immerses the sample 3. A slave box liquid outlet 201 is provided at the bottom of the slave box 2, and the main box 1 and the slave box 2 do not need to be connected under the condition that the corrosive liquid does not leak during use. The main box liquid inlet 101 is connected to the corrosive liquid container through a pipeline, and the slave box liquid outlet 201 is connected to the corrosive liquid container to ensure the circulation of the corrosive liquid.

[0061] The device includes a closed circulation system consisting of a main box 1 and a slave box 2. A splash-proof cover is provided on the top of the main box 1 to prevent the splash and volatilization of the corrosive liquid. A corrosive liquid circulation system is formed between the main box 1 and the slave box 2 through a pipeline, and the corrosive liquid circulation is driven by a low-power water pump. The device also includes a filtering device and a corrosive liquid container to ensure the cleanliness and reuse of the corrosive liquid. In addition, the device is designed with a temperature control and monitoring system, which can accurately control the temperature of the corrosive medium to simulate different marine environmental conditions.

[0062] The main box 1 and the slave box 2 are made of hard non-metallic materials to ensure the durability and corrosion resistance of the device. The main box 1 is designed with a circular hole inside for passing the sample 3. The corrosive liquid is injected from the circular hole on the top, flows out from the opening on the side, flows into the slave box 2 at the bottom, and returns to the corrosive liquid circulation device from the opening at the bottom. After being processed, it is injected into the main box 1 again, forming a full immersion corrosive liquid circulation.

[0063] Circulation system design: connected by pipes to form a closed circulation system. A low-power water pump is used to drive the corrosive liquid to circulate in the system. The filter device is used to filter the rust products that may be produced during the test to ensure the cleanliness of the circulating fluid.

[0064] Anti-splashing design: In order to prevent the corrosion liquid from splashing when the sample is rotating at high speed, the main box 1 is designed as a rectangular or square box with a top and a bottom. The sample 3 is in a fully immersed state when rotating, which makes it difficult for the corrosion liquid to splash.

[0065] Temperature and environmental control design: In order to simulate different marine environmental conditions, the device also includes a temperature control and monitoring system, which can accurately control the temperature of the corrosive medium to ensure the consistency and repeatability of the test conditions.

[0066] Operation and maintenance design: The design of the device focuses on the ease of operation and convenience of maintenance. All components are made of materials that are easy to clean and maintain, and the piping system is designed to be simple and easy to disassemble and clean to reduce maintenance workload.

[0067] A full immersion rotating bending corrosion simulation test method, the method comprising the following steps:

[0068] 1) Sample preparation: Select appropriate metal material as the sample 3 and process it into a standard size and shape according to the test requirements to ensure that the sample can fit into the circular hole 103 in the main box 1;

[0069] 2) Device settings: Figure 2 As shown, the sample 3 is passed through the circular hole 103 of the main box 1 and installed in the full immersion rotating bending corrosion simulation test device;

[0070] 3) Selection of corrosive media: Select the corresponding corrosive media according to the test purpose, such as simulated seawater, acidic or alkaline solution, etc., and inject it into the main box 1 and slave box 2 of the device. Figure 3 As shown, the corrosive medium is injected into the main box 1 through the main box liquid inlet 101 until the corrosive medium flows out from the main box liquid outlet 102, and the liquid level 4 in the main box 1 reaches a height that completely immerses the sample 3, ensuring that the sample 3 is completely immersed in the corrosive medium;

[0071] 4) Environmental parameter setting: through the temperature control and monitoring system, set the temperature, pH value and concentration of the corrosive medium to simulate specific marine environmental conditions;

[0072] 5) Start the circulation system: Start the low-power water pump to circulate the corrosive medium between the main box 1 and the slave box 2 to ensure that the sample 3 is continuously and evenly immersed in the corrosive medium;

[0073] 6) Rotational bending loading: Apply rotational bending load to the specimen to simulate the stress state under actual working conditions. Figure 4 As shown, the rotary bending equipment has been started and simulation tests are underway;

[0074] 7) Data monitoring and recording: During the test, monitoring equipment is used to record key parameters such as stress, strain, temperature and pH value of the sample;

[0075] 8) Corrosion damage assessment: Regularly check the corrosion damage of sample 3, including the formation and expansion of cracks, and the corrosion fatigue performance of the material;

[0076] 9) Test termination and analysis: After reaching the predetermined test cycle or sample 3 fails, stop the test and analyze the collected data to evaluate the corrosion fatigue performance of sample 3.

[0077] Application of results: Use the test results to provide a scientific basis for material selection, application and life prediction, and guide engineering practice.

[0078] Example 1

[0079] Test procedure:

[0080] 1. Prepare the corrosive environment according to the test requirements.

[0081] 2. Install the specimen 3 on the testing machine, keep it coaxial with the main shaft of the testing machine, and then clamp it firmly. When the main shaft of the testing machine is slowly turned by hand, the radial runout measured by the dial indicator on the main shaft barrel of the pure bending fatigue testing machine or the free end of the specimen 3 in the cantilever bending fatigue testing machine should not be greater than 0.03mm. After starting the testing machine, when it is running normally without load, the radial runout measured by the dial indicator on the force-applied part of the main shaft barrel should not be greater than 0.06mm.

[0082] 3. Adjust the corrosion device so that the sample 3 is completely immersed, and check whether there is any leakage in the environment.

[0083] 4. Start the testing machine and make the test frequency reach the specified value.

[0084] 5. Place sample 3 in the specified environment and subject it to the specified bending moment. The counter starts counting immediately.

[0085] 6. During the test, monitor and control environmental parameters to ensure that they meet the specified requirements.

[0086] 7. The test shall be carried out until sample 3 fails or the specified number of cycles is reached, and the test shall not be stopped midway.

[0087] 8. If any of the following conditions occurs, the test result will be invalid:

[0088] The failure of specimen 3 occurred outside its maximum stress position;

[0089] There are obvious defects on the fracture surface of sample 3;

[0090] During the test, the environment did not meet the specified requirements.

[0091] 9. Determination of the corrosion fatigue limit for 50% survival rate

[0092] The test is generally expected to be (0.95~1.05) CF(N) ) range, the number of failure cycles is close to the specified number of cycles. At each stress level, more than two specimens are generally tested. The stress increment is generally expected to be σ CF(N) The stress level of the first specimen 3 should be slightly higher than the expected σ CF(N) .

[0093] The test stress is calculated according to Table 1.

[0094] Table 1 Stress calculation and loading table of different types of testing machines

[0095]

[0096]

[0097] The test sequence is as follows Figure 5-7 shown.

[0098] According to the test results, take the stress obtained by any of the following methods as σ CF(N) :

[0099] a. The highest stress level at which half of the specimens are tested to the specified number of cycles without failure; however, at a stress level one level lower, the number of specimens that are tested to the specified number of cycles without failure should exceed half.

[0100] b. If at a certain stress level, more than half of the specimens are damaged before the specified number of cycles, and at a stress level one level lower than that, none of the specimens are damaged after the specified number of cycles, then the average value of these two stress levels is σ CF(N) .

[0101] Note: If necessary, the two parties can agree on the number of test specimens at each stress level and use statistical processing methods to determine σ CF(N) .

[0102] 10. Determination of SN curve

[0103] Usually, the stress level is 4 to 6. The fatigue life in the medium life zone is determined by the group test method. The number of specimens in each group gradually increases as the stress level decreases. According to step 9, the σ in the long life zone is determined. CF(N) .

[0104] The SN curve is obtained by fitting the above test data using the point-by-point tracing method or the least squares method.

[0105] The number of samples used is usually determined by the requirements of the data user, but in limited circumstances it is agreed upon by both parties.

[0106] There are two ways to express the test results:

[0107] 1. List method

[0108] The table should include the following:

[0109] Test sequence, specimen number, specimen size, shape or Kt, specimen surface roughness, test environment, test frequency, stress and number of cycles, average fatigue life in the medium life area and σ in the long life area CF(N) .

[0110] 2. Graphical method

[0111] The S-N curve is a commonly used method to illustrate fatigue test results. When drawing the S-N curve, the test stress (σ MAX Or σα, MPa) is the ordinate, and fatigue life N is the abscissa. Fatigue life uses logarithmic coordinates, and test stress uses linear or logarithmic coordinates.

[0112] Through the above technical scheme, the test method and device of the present invention can provide a continuous, stable and cyclic dynamic corrosion environment, meet the test needs of corrosion fatigue performance of various metal materials under the action of rotating bending dynamic force, and provide real and effective test data for its engineering design and fatigue verification.

[0113] The present invention provides a brand-new technical solution for simulating a real marine environment and conducting a full immersion corrosion fatigue performance test on metal materials. The device mainly includes a closed circulation system consisting of a main box and a slave box. A splash-proof cover is provided on the top of the main box to prevent the splash and volatilization of the corrosive liquid. A corrosive liquid circulation system is formed between the main box and the slave box through a pipeline, and the corrosive liquid circulation is driven by a low-power water pump. The device also includes a filtering device and a corrosive liquid container to ensure the cleanliness and reuse of the corrosive liquid. In addition, the device is designed with a temperature control and monitoring system, which can accurately control the temperature of the corrosive medium to simulate different marine environmental conditions.

[0114] The main purpose of the device is to provide a test device that can accurately simulate the full immersion corrosion environment for industries such as marine engineering, aerospace, and rail transportation, and is used to evaluate and study the fatigue performance of metal materials in corrosive media. Through this device, the actual application state of materials in the marine environment can be simulated more accurately, providing a scientific basis for the selection, application, and life prediction of materials. The device of the present invention has a simple structure, convenient operation, high test efficiency, and accurate and reliable data, and has broad application prospects and important practical value.

Claims

1. A full immersion rotating bending corrosion simulation test device, characterized in that: It includes a main box, a slave box, a corrosive liquid container, a water pump and a pipeline. The main box is fixedly connected in a slave box without a top cover; a main box liquid inlet is arranged on the top of the main box, a main box liquid outlet is arranged on one side wall, and a pair of symmetrical circular holes for passing the sample are arranged on the other two opposite side walls; a slave box liquid outlet is arranged on the bottom of the slave box; the height of the main box liquid outlet is higher than the height of the circular hole for passing the sample; the main box liquid inlet is connected to the corrosive liquid container through a pipeline, the slave box liquid outlet is connected to the corrosive liquid container through a pipeline, and the corrosive liquid is driven to circulate by a water pump installed in the corrosive liquid container.

2. The full immersion rotary bending corrosion simulation test device according to claim 1 is characterized in that: The master box and the slave box are both in the shape of a cuboid or a cube.

3. The full immersion rotary bending corrosion simulation test device according to claim 2 is characterized in that: The main box is in the shape of a closed cuboid or cube, and the slave box is in the shape of a topless cuboid or cube; the main box is bonded inside the topless slave box.

4. The full immersion rotary bending corrosion simulation test device according to claim 1 is characterized in that: The lowest point of the liquid outlet of the main box is higher than the highest point of the circular hole passing through the sample.

5. The full immersion rotary bending corrosion simulation test device according to claim 1 is characterized in that: The diameter of the circular hole passing through the sample is not greater than 1.2 times the diameter of the sample.

6. The full immersion rotating bending corrosion simulation test device according to claim 1 is characterized in that: The master box and slave box are made of hard non-metallic materials.

7. The full immersion rotating bending corrosion simulation test device according to claim 1 is characterized in that: The top of the main box is provided with a splash-proof cover.

8. The full immersion rotary bending corrosion simulation test device according to claim 7 is characterized in that: The device also includes a filtering device.

9. The full immersion rotary bending corrosion simulation test device according to claim 1 is characterized in that: The unit also includes a temperature control and monitoring system.

10. A full immersion rotating bending corrosion simulation test method, comprising the following steps: Step 1: Prepare the specimen, select appropriate metal material as the specimen, and process it into standard size and shape according to the test requirements to ensure that the specimen can fit into the circular hole in the main box; Step 2: Install the sample: pass the processed sample through the circular hole of the main box and install it in the full immersion rotating bending corrosion fatigue test device; Step 3: Inject the corrosive medium into the main box through the main box liquid inlet until the corrosive medium flows out from the main box liquid outlet and the liquid level in the main box reaches a height that completely immerses the sample, ensuring that the sample is completely immersed in the corrosive medium. Step 4: Set environmental parameters. According to the test requirements, set the temperature, pH value and concentration parameters of the corrosive medium to simulate specific marine environmental conditions. Step 5: Start the circulation system to allow the corrosive medium to circulate between the master box and the slave box to ensure that the sample is continuously and evenly exposed to the corrosive medium; Step 6: Apply load, apply rotational bending load to the sample to simulate the stress state under actual working conditions; Step 7: Monitor and record data. During the test, use monitoring equipment to record the key parameters of the specimen’s stress, strain, temperature of the corrosive medium, and pH value. Step 8: Evaluate corrosion damage and regularly check the corrosion damage of the specimens, including the formation and expansion of cracks, as well as the corrosion fatigue performance of the material; Step 9: End the test and analyze the data. After reaching the predetermined test cycle or the sample fails, stop the test and analyze the collected data to evaluate the corrosion fatigue performance of the sample.

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