Stress corrosion experimental device

Abstract

The utility model discloses a stress corrosion experimental device, which solves the technical problem of harm of corrosive liquid to a human body in an experiment in the prior art, the stress corrosion experimental device comprises more than one bracket, a corrosion tank, a new acid tank, a waste acid tank and a cleaning tank, the bracket comprises a bracket body and a limiting piece arranged on the bracket body, and more than one through hole is formed in the bracket body; the corrosion tank is used for accommodating more than one bracket; the new acid tank is communicated with the corrosion tank through a first pipeline, and a circulating pump is arranged on the first pipeline; the waste acid tank is communicated with the corrosion tank through a second pipeline; a first valve is arranged on the second pipeline; the cleaning tank is used for containing one or more supports and communicated with the waste acid tank through a third pipeline, and a second valve is arranged on the third pipeline. When the bracket is placed in the corrosion tank, the corrosion liquid is not injected into the corrosion tank; before the stent is taken out, the corrosive liquid is discharged in advance; manual contact with corrosive liquid can be avoided, and harm of the corrosive liquid to human bodies is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of corrosion test devices, and specifically relates to a stress corrosion test device. Background Art

[0002] Ultra-high-strength automotive sheet metal has become one of the indispensable materials in the modern automotive industry due to its excellent mechanical properties and formability. Ultra-high-strength automotive sheet metal not only improves the collision safety of vehicles, but also effectively reduces the weight of the vehicle body, reduces fuel consumption, reduces emissions, and meets the core needs of modern automobile design. Among them, galvanized ultra-high-strength steel sheet metal is an important classification of this material. By coating a layer of zinc on the surface of the steel sheet metal, it provides additional corrosion protection, thereby extending the service life of the vehicle. However, the corrosion resistance of the galvanized layer is affected by many factors. The U-shaped bending corrosion test is an important method to evaluate the corrosion resistance of galvanized ultra-high-strength steel sheet metal. In this experiment, the steel sheet is artificially made into a U-shaped specimen and placed in a corrosive solution under stress conditions to simulate the corrosion conditions in the actual use environment. The experimental results can characterize the corrosion resistance of the material in actual application and have a direct impact on the material selection in automobile design.

[0003] In the existing technology, the U-bend test of high-strength automotive panels is performed by manually processing the test specimens and then placing them in a corrosive solution for testing, which is labor-intensive. Since the corrosive solution is acidic, repeated contact with the human body can cause certain harm to the human body, and human factors have a significant impact on the accuracy of the test results. Summary of the Invention

[0004] In order to solve the above technical problems, the present application provides a stress corrosion experimental device.

[0005] The technical solution adopted to achieve the purpose of this application is a stress corrosion test device, comprising:

[0006] One or more brackets, each bracket comprising a bracket body, one or more position-limiting members provided on the bracket body for limiting the position of the sample, and the bracket body having one or more through holes for the circulation of etching liquid or / and cleaning liquid;

[0007] a corrosion tank for accommodating the one or more brackets;

[0008] A new acid tank is connected to the corrosion tank through a first pipeline, and a circulation pump is provided on the first pipeline;

[0009] a waste acid tank, connected to the corrosion tank via a second pipeline, wherein a first valve is provided on the second pipeline;

[0010] a cleaning tank for accommodating the one or more brackets, wherein the cleaning tank is connected to the waste acid tank via a third pipeline, and a second valve is provided on the third pipeline;

[0011] Wherein, when performing a corrosion experiment, the one or more brackets are placed in the corrosion tank; when performing a cleaning operation, the one or more brackets are placed in the cleaning tank.

[0012] In some embodiments, the bracket further comprises a support member provided on the bracket body and arranged at an angle to the bracket body, the one or more brackets are horizontally arranged in the corrosion groove, and the support member abuts against the corrosion groove and / or the adjacent bracket body;

[0013] Alternatively, the one or more brackets are horizontally arranged in the cleaning tank, and the support member abuts against the cleaning tank and / or the adjacent bracket body.

[0014] In some embodiments, the support members are provided on the upper surface and the lower surface of the bracket body, and the support members located on the upper surface correspond to the support members located on the lower surface or are staggered in an upper and lower manner.

[0015] In some embodiments, the limiting member is cylindrical, and the sample is sleeved on the limiting member;

[0016] The height of the supporting member is higher than that of the limiting member.

[0017] In some embodiments, the etching tank and the cleaning tank have the same shape, and the shape of the bracket matches the shapes of the etching tank and the cleaning tank.

[0018] In some embodiments, the cross-sections of the etching tank and the cleaning tank are rectangular, and the cross-section of the bracket is a rectangle corresponding to the etching tank and the cleaning tank.

[0019] In some embodiments, the etching tank and the cleaning tank are arranged side by side, the new acid tank and the waste acid tank are arranged side by side, and the etching tank and the cleaning tank are located directly above the new acid tank and the waste acid tank respectively.

[0020] In some embodiments, the experimental device further includes a filtering device and a fourth pipeline connected to both the new acid tank and the spent acid tank, the filtering device is provided in the fourth pipeline, and the fourth pipeline is further provided with a third valve.

[0021] In some embodiments, at least one of the etching tank, the new acid tank, the spent acid tank, and the cleaning tank is provided with a radar level gauge; and the new acid tank is also provided with a acidity meter.

[0022] In some embodiments, the experimental device further includes a controller, and the radar level meter, the pH meter, the circulation pump, the first valve, the second valve, and the third valve are all electrically connected to the controller.

[0023] It can be seen from the above technical solution that the present application provides a stress corrosion experimental device, which includes one or more brackets, a corrosion tank, a new acid tank, a waste acid tank and a cleaning tank, wherein the bracket includes a bracket body, one or more limit members provided on the bracket body for limiting the sample, and the bracket body is provided with one or more through holes for the circulation of corrosion liquid or / cleaning liquid; the corrosion tank is used to accommodate one or more brackets; the new acid tank is connected to the corrosion tank through a first pipeline, and a circulation pump is provided on the first pipeline; the waste acid tank is connected to the corrosion tank through a second pipeline, and a first valve is provided on the second pipeline; the cleaning tank is used to accommodate one or more brackets, and the cleaning tank is connected to the waste acid tank through a third pipeline, and a second valve is provided on the third pipeline; wherein, when conducting a corrosion experiment, one or more brackets are placed in the corrosion tank; when performing a cleaning operation, one or more brackets are placed in the cleaning tank.

[0024] Before conducting a corrosion experiment, a specimen is fixed on a bracket, and then the bracket is placed in a corrosion tank. A circulating pump is provided in the fresh acid tank to inject the corrosive liquid in the fresh acid tank into the corrosion tank. When cleaning is required, the corrosive liquid in the corrosion tank is sent to the waste acid tank through a second pipeline via a first valve. The bracket is then manually removed and placed in a cleaning tank. That is, when the bracket is placed in the corrosion tank, no corrosive liquid is injected into the corrosion tank. Before the bracket is removed, the corrosive liquid is released in advance. This can avoid manual contact with the corrosive liquid and reduce the harm of the corrosive liquid to the human body. By using the corrosion tank, fresh acid tank, cleaning tank, and waste acid tank in combination, corrosion, cleaning, and waste liquid collection can be completed, thereby improving experimental efficiency. By injecting the corrosive liquid into the corrosion tank through the fresh acid tank and the circulating pump, the volume of the corrosive liquid injected into the corrosion tank can be controlled, reducing the influence of human factors on the experimental results and improving experimental accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of the stress corrosion experimental device in the embodiment of this application.

[0026] Figure 2 for Figure 1 Schematic diagram of the structure of the bracket.

[0027] Figure 3 for Figure 1 Schematic diagram of the corrosion tank structure.

[0028] Figure 4 for Figure 1 Schematic diagram of the cleaning tank structure.

[0029] Figure 5 for Figure 1 Schematic diagram of the new acid tank structure.

[0030] Figure 6 for Figure 1 Schematic diagram of the waste acid tank structure.

[0031] Explanation of the accompanying reference numerals: 100 - corrosion experimental device, 110 - bracket, 111 - bracket body, 112 - limiter, 113 - through hole, 114 - support member, 115 - handle, 120 - corrosion tank, 130 - new acid tank, 131 - first pipeline, 132 - circulation pump, 133 - acidity meter, 140 - waste acid tank, 141 - second pipeline, 142 - first valve, 150 - cleaning tank, 151 - third pipeline, 152 - second valve, 160 - filtering device, 161 - fourth pipeline, 162 - third valve, 170 - radar level gauge. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to which this application belongs to understand this application more clearly, the technical solution of this application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0033] In the embodiment of the present application, the specimen used for the stress corrosion experiment is a U-shaped specimen or a C-shaped specimen. Taking the steel plate as an example, the steel plate is a rectangular steel plate, and connection holes are opened at both ends of the steel plate. The steel plate is bent into a U-shape or a C-shape so that the two connection holes at the ends correspond to each other, and then the ends are fixed by fasteners passing through the two connection holes so that the specimen maintains the U-shape and C-shape.

[0034] In the embodiments of this application, as shown in the attached Figure 1 To the attached Figure 6 As shown, a stress corrosion test device 100 includes one or more brackets 110, a corrosion tank 120, a new acid tank 130, a waste acid tank 140 and a cleaning tank 150, wherein the bracket 110 includes a bracket body 111, one or more limiters 112 provided on the bracket body 111 for limiting the position of the sample, and the bracket body 111 is provided with one or more through holes 113 for the circulation of corrosion liquid or / cleaning liquid; the corrosion tank 120 is used to accommodate one or more brackets 110; the new acid tank 130 and the corrosion tank 120 are connected through a first pipeline 111. 31 is connected, and a circulation pump 132 is provided on the first pipeline 131; the waste acid tank 140 is connected to the corrosion tank 120 through a second pipeline 141, and a first valve 142 is provided on the second pipeline 141; the cleaning tank 150 is used to accommodate more than one bracket 110, and the cleaning tank 150 is connected to the waste acid tank 140 through a third pipeline 151, and a second valve 152 is provided on the third pipeline 151; wherein, when performing a corrosion experiment, more than one bracket 110 is placed in the corrosion tank 120; when performing a cleaning operation, more than one bracket 110 is placed in the cleaning tank 150.

[0035] In some embodiments, as shown in the attached Figure 2 As shown, the bracket 110 is used to place the sample, and the limiting member 112 is cylindrical, which can be cylindrical or elliptical. The sample is placed on the limiting member 112 to limit the sample. The cross-sectional radius of each limiting member 112 can be different, that is, some can be the same and some can be different, so as to fix samples of different sizes.

[0036] In some embodiments, as shown in the attached Figure 2 As shown, the bracket 110 is a tray made of polypropylene (PP). PP is a polypropylene material with excellent chemical and acid resistance, suitable for various corrosion test environments. In certain embodiments, each bracket body 111 is provided with 18 stoppers 112, each for measuring six groups of specimens of different sizes, with each group containing three specimens of the same size.

[0037] In some embodiments, as shown in the attached Figure 1 and attached Figure 3 As shown, the etching tank 120 is used to hold the bracket 110, wherein the bracket 110 can be placed horizontally in the etching tank 120, and multiple brackets 110 can be placed in an upper and lower order. The cleaning tank 150 can effectively clean the sample after the experiment to remove the attached corrosive medium and residue. The fresh acid tank 130 can store and provide fresh corrosive solution to support the corrosion experiment. In other embodiments, the etching tank 120 and the cleaning tank 150 are respectively provided with an etching tank cover and a cleaning tank cover.

[0038] In some embodiments, as shown in the attached Figure 1 and attached Figure 3 As shown, two sets of brackets 110 can be provided, and both sets of brackets 110 are placed in the corrosion tank 120 to support simultaneous testing of multiple sets of samples, thereby improving experimental efficiency. In other embodiments, the corrosion tank 120, the new acid tank 130, the spent acid tank 140, and the cleaning tank 150 are all made of PP material to ensure its chemical resistance and acid resistance.

[0039] Therefore, before conducting the corrosion experiment, the sample is fixed on the bracket 110, and then the bracket 110 is placed in the corrosion tank 120. The new acid tank 130 is provided with a circulation pump 132, so that the corrosive liquid in the new acid tank 130 can be injected into the corrosion tank 120. The circulation pump 132 is responsible for the circulation of the corrosive medium in the corrosion tank 120 to ensure the uniform distribution of the corrosive medium around the sample; when cleaning is required, the corrosive liquid in the corrosion tank 120 can be sent to the waste acid tank 140 through the first valve 142 and the second pipeline 141, and then the bracket 110 is manually taken out and placed in the cleaning tank 150. That is, when the bracket 110 is placed in the corrosion tank 120, no corrosion liquid is injected into the corrosion tank 120; before the bracket 110 is taken out, the corrosion liquid is released in advance; this can avoid human contact with the corrosion liquid and reduce the harm of the corrosion liquid to the human body; through the coordinated use of the corrosion tank 120, the new acid tank 130, the cleaning tank 150 and the waste acid tank 140, corrosion, cleaning and waste liquid collection can be completed, thereby improving the experimental efficiency; the corrosion liquid is injected into the corrosion tank 120 through the new acid tank 130 and the circulation pump 132, and the capacity of the corrosion liquid injected into the corrosion tank 120 can be controlled, thereby reducing the influence of human factors on the experimental results.

[0040] In some embodiments, as shown in the attached Figure 1 and attached Figure 2 As shown, the bracket 110 further includes a support member 114 disposed on the bracket body 111 and arranged at an angle to the bracket body 111. One or more brackets 110 are horizontally disposed in the etching groove 120, and the support member 114 abuts against the etching groove 120 and / or an adjacent bracket body 111. In certain embodiments, when the bracket 110 is placed in the etching groove 120 for etching, if there is only one bracket 110, the support member 114 on the bracket 110 may abut against the bottom inner wall of the etching groove 120, thereby supporting and positioning the lower bracket 110 and preventing the bracket 110 from shaking. In other embodiments, when the number of brackets 110 is two, the brackets 110 can be stacked up and down, and the support member 114 on the bottom bracket 110 can abut against the bottom inner wall of the corrosion groove 120, thereby supporting and positioning the lower bracket 110, and the support member 114 on the upper bracket 110 can abut against the lower bracket body 111, thereby supporting and positioning the upper bracket 110.

[0041] In other embodiments, as shown in the attached Figure 1 and attached Figure 2As shown, one or more brackets 110 are horizontally arranged in the cleaning tank 150, and the support members 114 abut against the cleaning tank 150 and / or the adjacent bracket bodies 111. When the bracket 110 is placed in the cleaning tank 150 for cleaning, if there is only one bracket 110, the support member 114 on the bracket 110 can abut against the inner wall of the bottom of the cleaning tank 150, thereby supporting and positioning the lower bracket 110 and preventing the bracket 110 from shaking. In other embodiments, when there are two brackets 110, the brackets 110 can be stacked up and down, and the support member 114 on the bracket 110 at the bottom can abut against the inner wall of the bottom of the cleaning tank 150, thereby supporting and positioning the lower bracket 110, and the support member 114 on the bracket 110 at the top can abut against the bracket body 111 at the bottom, thereby supporting and positioning the upper bracket 110.

[0042] In order to further improve the stability of adjacent brackets 110, in some embodiments, as shown in the attached Figure 1 and attached Figure 2 As shown, the support members 114 are provided on the upper and lower surfaces of the bracket body 111. The support members 114 on the upper surface correspond to or are staggered with the support members 114 on the lower surface. In some embodiments, there are two brackets 110. The support members 114 above the bottom bracket 110 and the support members 114 below the upper bracket 110 may correspond to each other, that is, the support members 114 above the bottom bracket 110 and the support members 114 below the upper bracket 110 may directly abut against each other. In other embodiments, the number of brackets 110 is two, and the support member 114 located above the bottom bracket 110 and the support member 114 located below the upper bracket 110 are staggered, that is, the support member 114 located above the bottom bracket 110 and the support member 114 located below the upper bracket 110 can be staggered, that is, the support member 114 located above the bottom bracket 110 directly abuts the lower surface of the upper bracket 110, and in addition, the support member 114 located below the upper bracket 110 directly abuts the upper surface above the bottom bracket 110, thereby increasing the contact area of ​​adjacent brackets 110.

[0043] In some embodiments, as shown in the attached Figure 1 and attached Figure 2 As shown, the height of the support member 114 is higher than that of the limiting member 112 , so as to prevent the sample of the limiting member 112 from contacting with the bracket body 111 .

[0044] In order to facilitate the transport of the bracket 110 in the corrosion tank 120 and the cleaning tank 150, in some embodiments, as shown in the attached Figure 1As shown, the etching tank 120 and the cleaning tank 150 have the same shape, and the shape of the bracket 110 matches the shape of the etching tank 120 and the cleaning tank 150, that is, the bracket 110 can be placed in both the etching tank 120 and the cleaning tank 150. In some embodiments, the etching tank 120 is a rectangular tank, and the corresponding cleaning tank 150 is also a rectangular tank. In order to facilitate the transfer of the bracket 110 between the etching tank 120 and the cleaning tank 150, the etching tank 120 and the cleaning tank 150 have the same size, and the bracket 110 can be placed in both the etching tank 120 and the cleaning tank 150. In other embodiments, the etching tank 120 is a cylindrical tank, and the corresponding cleaning tank is also a cylindrical tank.

[0045] In some embodiments, as shown in the attached Figure 1 As shown, the cross-sections of the etching tank 120 and the cleaning tank 150 are rectangular, and the cross-section of the bracket 110 is a rectangle corresponding to the etching tank 120 and the cleaning tank 150. That is, it is convenient to transport the bracket 110 in the etching tank 120 and the cleaning tank 150.

[0046] In some embodiments, as shown in the attached Figure 1 As shown, the etching tank 120 and the cleaning tank 150 are arranged side by side, and the new acid tank 130 and the waste acid tank 140 are arranged side by side, and the etching tank 120 and the cleaning tank 150 are respectively located directly above the new acid tank 130 and the waste acid tank 140. By arranging the etching tank 120 and the cleaning tank 150 side by side, it is convenient to transport the bracket 110 from the etching tank 120 and the cleaning tank 150. In addition, the etching tank 120 is located directly above the new acid tank 130, which facilitates the transportation of the etching solution in the new acid tank 130 to the etching tank 120. The cleaning tank 150 is located directly above the waste acid tank 140, which facilitates the injection of the cleaning solution into the waste acid tank 140, saving pipelines. In addition, it is also convenient to inject the etching solution that cannot be recycled in the etching tank 120 into the waste acid tank 140.

[0047] In order to improve the recycling of the corrosive liquid, in some embodiments, as shown in the attached Figure 1 and attached Figure 3 As shown, the experimental apparatus further includes a filter device 160 and a fourth pipeline 161 connected to both the new acid tank 130 and the spent acid tank 140. The filter device 160 is disposed in the fourth pipeline 161, and the fourth pipeline 161 is further provided with a third valve 162. The filter device 160 can be a filter screen, etc., and only needs to filter the corrosive liquid. This is not limited in the present application. By filtering the corrosive liquid after corrosion in the corrosion tank 120, and then returning the filtered corrosive liquid to the new acid tank 130, and then providing it for the next corrosion test, the number of times the corrosive liquid can be used is increased.

[0048] In some embodiments, as shown in the attached Figure 1As shown, at least one of the etching tank 120, the fresh acid tank 130, the spent acid tank 140, and the cleaning tank 150 is equipped with a radar level gauge 170. The radar level gauge 170 is provided in each of the etching tank 120, the fresh acid tank 130, the spent acid tank 140, and the cleaning tank 150. The radar level gauge 170 allows the corresponding liquid level to be determined, thereby facilitating subsequent operations such as replenishing or draining the corresponding liquid. In other embodiments, the fresh acid tank 130 is further equipped with an acidity meter 133 for monitoring the acid concentration so that the acidity meter 133 can be promptly replaced if the concentration falls below the required level.

[0049] In some embodiments, as shown in the attached Figure 1 As shown, the experimental device also includes a controller, and the radar level gauge 170, the circulation pump 132, the first valve 142, the second valve 152, and the third valve 162 are all electrically connected to the controller. The first valve 142, the second valve 152, and the third valve 162 can all be electric valves, that is, the radar level gauge 170, the pH meter 133, the circulation pump 132, the first valve 142, the second valve 152, and the third valve 162 can be controlled by the controller. When the radar level gauge 170 displays the corresponding liquid level, the controller obtains the relevant signal and can control the circulation pump 132, the first valve 142, the second valve 152, and the third valve 162 to open and close, which is simple to operate. In other embodiments, the first valve 142, the second valve 152, and the third valve 162 can also be manual valves for manual control.

[0050] The steps for this application are:

[0051] S1: Before conducting the corrosion test, check whether the equipment is intact, whether the acid level in the new acid tank 130 is normal, and whether the corresponding pipeline valves are normal.

[0052] S2: Open the corrosion tank cover, place the bracket 110 at the bottom of the corrosion tank 120, then place the samples on the bracket 110 in order, then place the second layer of bracket 110, and then place the samples on the second layer of bracket 110, and close the corrosion tank cover.

[0053] S3: The controller injects the etching liquid in the new acid tank 130 into the etching tank 120 through the circulation pump 132. During the test period, in order to ensure the concentration and volume of the etching liquid, the radar level meter 170 signal is used to replenish the etching liquid in the etching tank 120.

[0054] S4: After the test cycle is completed, the corrosive liquid is discharged into the wastewater tank, and the bracket 110 is moved into the cleaning tank 150 for sample cleaning.

[0055] S5: After cleaning is complete, the cleaning liquid is placed in a waste tank for collection. At the same time, the sample is taken out and dried, and the U-bend corrosion of the sample is evaluated.

[0056] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0057] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A stress corrosion test device, characterized in that: include: One or more brackets, each bracket comprising a bracket body, one or more position-limiting members provided on the bracket body for limiting the position of the sample, and the bracket body having one or more through holes for the circulation of etching liquid or / and cleaning liquid; a corrosion tank for accommodating the one or more brackets; A new acid tank is connected to the corrosion tank through a first pipeline, and a circulation pump is provided on the first pipeline; a waste acid tank, connected to the corrosion tank via a second pipeline, wherein a first valve is provided on the second pipeline; a cleaning tank for accommodating the one or more brackets, wherein the cleaning tank is connected to the waste acid tank via a third pipeline, and a second valve is provided on the third pipeline; Wherein, when performing a corrosion experiment, the one or more brackets are placed in the corrosion tank; when performing a cleaning operation, the one or more brackets are placed in the cleaning tank.

2. The stress corrosion test device according to claim 1, characterized in that: The bracket further comprises a support member provided on the bracket body and arranged at an angle to the bracket body, the one or more brackets are horizontally arranged in the corrosion groove, and the support member abuts against the corrosion groove and / or the adjacent bracket body; Alternatively, the one or more brackets are horizontally arranged in the cleaning tank, and the support member abuts against the cleaning tank and / or the adjacent bracket body.

3. The stress corrosion test device according to claim 2, characterized in that: The support members are arranged on the upper surface and the lower surface of the bracket body, and the support members located on the upper surface correspond to the support members located on the lower surface in an up-down manner or are arranged in an up-down staggered manner.

4. The stress corrosion test device according to claim 3, characterized in that: The limiting member is cylindrical, and the sample is sleeved on the limiting member; The height of the supporting member is higher than that of the limiting member.

5. The stress corrosion test device according to any one of claims 1 to 4, characterized in that: The corrosion tank and the cleaning tank have the same shape, and the shape of the bracket matches the shapes of the corrosion tank and the cleaning tank.

6. The stress corrosion test device according to claim 5, characterized in that: The cross sections of the corrosion tank and the cleaning tank are rectangular, and the cross section of the bracket is a rectangle corresponding to the corrosion tank and the cleaning tank.

7. The stress corrosion test device according to any one of claims 1 to 4, characterized in that: The etching tank and the cleaning tank are arranged side by side, the new acid tank and the waste acid tank are arranged side by side, and the etching tank and the cleaning tank are located directly above the new acid tank and the waste acid tank respectively.

8. The stress corrosion test device according to any one of claims 1 to 4, characterized in that: The experimental device further includes a filtering device and a fourth pipeline connected to both the new acid tank and the spent acid tank. The filtering device is arranged in the fourth pipeline, and the fourth pipeline is further provided with a third valve.

9. The stress corrosion test device according to any one of claims 1 to 4, characterized in that: At least one of the etching tank, the new acid tank, the waste acid tank and the cleaning tank is provided with a radar level meter; the new acid tank is also provided with an acidity meter.

10. The stress corrosion test device according to claim 9, characterized in that: The experimental device further includes a controller, and the radar level meter, the acidity meter, the circulation pump, the first valve, the second valve and the third valve are all electrically connected to the controller.

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