Sample corrosion test device

Abstract

The utility model discloses a sample corrosion test device which comprises a sealed test tank, a solution dripping device, a gas conveying device, a detection and collection device and a tail gas treatment device, a gas input pipe, a gas output pipe and a solution dropping pipe are arranged on the sealing test tank; an outlet of the gas input pipe and the sample are both immersed in the solution of the sealed test tank; the solution dropwise adding device is connected with a solution dropwise adding pipe of the sealing test tank through a pipeline, and the solution dropwise adding device is suitable for quantitatively conveying a corrosion medium adjusting solution into the sealing test tank; according to the utility model, the pH value of the solution for corrosion can be adjusted, the dissolved oxygen of the solution is ensured to be within a specified range, meanwhile, the change of the pH value and the dissolved oxygen of the solution during the test can be monitored in real time, and the operation is simple.

Description

Technical Field

[0001] The utility model relates to a specimen corrosion test device, belonging to the technical field of test devices. Background Art

[0002] At present, corrosion is a common destruction phenomenon that materials occur in the environment, widely existing in fields such as petroleum, chemical industry, aerospace, and ocean engineering. Corrosion will not only lead to the decline of material properties, but may even cause major safety accidents. Therefore, corrosion monitoring and control are of great significance in engineering applications.

[0003] After retrieving the prior art, it is found that a Chinese patent with the publication number CN220820509U discloses a sulfide stress corrosion solution filling device. In this patent, vacuum pumping is used for deoxidation, but it is found during use that the cost of vacuum pumping is relatively high, the operation is complex, and it is not very convenient to use. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a specimen corrosion test device which can adjust the pH of the corrosion solution, ensure that the dissolved oxygen content of the solution is within a specified range, can simultaneously detect the changes of the pH value and dissolved oxygen content of the solution during the test in real time, and has a simple operation.

[0005] To solve the above technical problem, the technical solution of the utility model is: a specimen corrosion test device, comprising:

[0006] A sealed test tank, which is suitable for accommodating the corrosion solution and placing specimens, and is provided with a gas input pipe, a gas output pipe and a solution dropping pipe on the sealed test tank;

[0007] The outlet of the gas input pipe and the specimen are both immersed in the solution of the sealed test tank;

[0008] A solution dropping device, which is connected to the solution dropping pipe of the sealed test tank through a pipeline, and is suitable for quantitatively transporting the corrosion medium adjusting solution into the sealed test tank;

[0009] A gas conveying device, which is connected to the gas input pipe of the sealed test tank through a gas path, and is suitable for introducing corrosive gas and / or inert gas into the sealed test tank;

[0010] A detection and acquisition device, which includes a detection part arranged in the solution of the sealed test tank and an acquisition part arranged outside the sealed test tank. The detection part is electrically connected to the acquisition part, and the acquisition part is suitable for acquiring the pH value and dissolved oxygen content of the solution in the sealed test tank detected by the detection part;

[0011] An exhaust gas treatment device, which is connected to the gas output pipe of the sealing test tank through a gas path, and is adapted to treat the gas discharged from the sealing test tank.

[0012] Furthermore, a specific structure of the exhaust gas treatment device is provided. The exhaust gas treatment device includes:

[0013] A gas treatment container, in which a neutralization solution is provided;

[0014] The gas output pipe of the sealing test tank is communicated with the gas treatment container, and the outlet end of the gas output pipe extends below the liquid level of the neutralization solution;

[0015] An air outlet is provided at the upper part of the gas treatment container, and the air outlet is adapted to discharge the treated gas.

[0016] Furthermore, a specific type of the neutralization solution is provided. The neutralization solution in the gas treatment container is an aqueous sodium hydroxide solution.

[0017] Furthermore, in order to prevent the neutralization solution from flowing back with the outside gas, the exhaust gas treatment device further includes an anti-backflow device;

[0018] Wherein, the anti-backflow device is arranged between the gas treatment container and the gas output pipe of the sealing test tank;

[0019] The anti-backflow device is adapted to prevent the neutralization solution in the gas treatment container and the outside gas from flowing back into the sealing test tank.

[0020] Furthermore, the detection part includes a pH sensor and a dissolved oxygen sensor;

[0021] The acquisition part is a controller;

[0022] The controller is respectively connected to the solution dropping device and the gas conveying device, and the controller is adapted to control the actions of the solution dropping device and / or the gas conveying device according to the pH value collected by the pH sensor and the dissolved oxygen content collected by the dissolved oxygen sensor.

[0023] Furthermore, the specimen corrosion test device further includes an annular sealing ring;

[0024] An annular groove matching with the annular sealing ring is provided on the peripheral edge of the opening of the sealing test tank;

[0025] The annular sealing ring is embedded in the annular groove of the sealing test tank.

[0026] Further, a specific structure of a gas delivery device is provided. The gas delivery device includes:

[0027] A main pipeline, one end of which is connected to the gas input pipe of the sealing test tank;

[0028] At least two branch pipes, two of which are respectively connected to the other end of the main pipeline;

[0029] One of the branch pipes is adapted to be connected to a corrosive gas source, and the other branch pipe is adapted to be connected to an inert gas source;

[0030] Control valves are provided on the branch pipes, and the control valves are adapted to adjust the flow rate of the corresponding gas.

[0031] Further, the specimen corrosion test device further includes a check valve, and the check valve is provided on the control valve.

[0032] Further, in order to fully expose the specimen in the solution and make the corrosion more uniform, the specimen corrosion test device further includes a specimen carrier. A plurality of support columns are provided on the specimen carrier, and the support columns support between the specimen carrier and the bottom of the sealing test tank, forming a gap between the specimen carrier and the bottom of the sealing test tank;

[0033] The upper surface of the specimen carrier is a specimen bearing surface, and the specimen bearing surface is adapted to place the specimen.

[0034] Further, a specific material of the specimen carrier is provided. The specimen carrier is made of plexiglass material.

[0035] Further, the solution dropping device includes a corrosion medium regulating solution container and a liquid control valve. The corrosion medium regulating solution container contains a corrosion medium regulating solution. The corrosion medium regulating solution container is connected to the sealing test tank through a pipeline, and the liquid control valve is installed on the pipeline between the corrosion medium regulating solution container and the sealing test tank.

[0036] Further, the specimen has a C-shaped ring structure, and each end is provided with a through hole;

[0037] The specimen corrosion test device further includes a specimen clamping device, and the specimen clamping device includes;

[0038] A screw rod, which passes through the through holes at both ends of the specimen;

[0039] Nuts, which are threadedly connected to both ends of the screw rod;

[0040] The specimen is vertically placed in the sealing test tank through the screw rod and the nuts.

[0041] Adopting the above technical solution, the utility model has the following beneficial effects:

[0042] In the utility model, first, the test sample is placed in the sealed test tank, and then a corrosive solution is added, and the solution submerges the test sample. Before the test, only inert gas is conveyed by the gas conveying device to remove oxygen, ensuring that the dissolved oxygen content is less than 10 ppb. In addition, during the process of the gas conveying device conveying gas, the excess gas passes through the tail gas treatment device and is discharged after harmless treatment by the tail gas treatment device. When the test starts, the solution dropping device is used to quantitatively convey the corrosion medium to adjust the solution, and the corrosion medium adjusting solution can be hydrochloric acid. After the corrosion medium adjusting solution is dropped, the gas conveying device is used to convey inert gas or corrosive gas to uniformly mix the solution. During the whole process, the detection and acquisition device real-time detects the pH value and dissolved oxygen content of the solution, and the corrosion medium adjusting solution of the solution dropping device is used to control the pH value within the target range, not exceeding 0.2 pH units of the target value, maintaining the stability and controllability of the test conditions.

[0043] In addition, a tail gas treatment device is adopted to treat the discharged gas through a neutralizing solution, prevent the leakage of harmful gases, and prevent the neutralizing solution from flowing back through a backflow prevention device, ensuring the safety of the experiment and environmental protection. The annular sealing ring prevents gas leakage during the test process. The test sample bearing platform and the test sample clamping device ensure the uniform exposure of the test sample in the solution, ensuring the uniformity of the corrosion effect.

[0044] In summary, the utility model realizes the detection of the pH value and dissolved oxygen content of the solution during the corrosion test of the test sample, ensuring the stability, accuracy and safety of the experiment. It is easy to operate, reliable in performance, improves the efficiency and accuracy of the corrosion test, and provides a reliable experimental platform. Description of the Drawings

[0045] Figure 1 It is a schematic structural diagram of the test sample corrosion test device of the utility model. Detailed Embodiments

[0046] In order to make the content of the utility model easier to be clearly understood, the following further detailed description of the utility model is given according to specific embodiments and in combination with the drawings.

[0047] As Figure 1 shown, a test sample corrosion test device includes:

[0048] A sealed test tank 1, in which a solution for corrosion and a test sample 2 are adapted to be accommodated. A gas input pipe 11, a gas output pipe 12 and a solution dropping pipe 13 are provided on the sealed test tank 1;

[0049] The outlet of the gas inlet pipe 11 and the specimen 2 are both immersed in the solution in the sealed test tank 1;

[0050] A solution dropping device 3, the solution dropping device 3 is connected to the solution dropping pipe 13 of the sealed test tank 1 through a pipeline, and the solution dropping device 3 is adapted to quantitatively transport the corrosion medium regulating solution into the sealed test tank 1;

[0051] A gas delivery device 4, the gas delivery device 4 is connected to the gas inlet pipe 11 of the sealed test tank 1 through a gas path, and the gas delivery device 4 is adapted to introduce corrosive gas or inert gas into the sealed test tank 1;

[0052] A detection and acquisition device, the detection and acquisition device includes a detection part 51 arranged in the solution in the sealed test tank 1 and an acquisition part 52 arranged outside the sealed test tank 1, the detection part 51 is electrically connected to the acquisition part 52, and the acquisition part 52 is adapted to acquire the pH value and dissolved oxygen content of the solution in the sealed test tank 1 detected by the detection part 51;

[0053] An exhaust gas treatment device, the exhaust gas treatment device is connected to the gas outlet pipe 12 of the sealed test tank 1 through a gas path, and the exhaust gas treatment device is adapted to treat the gas discharged from the sealed test tank 1.

[0054] In this embodiment, as Figure 1 shown, first, the specimen 2 is placed in the sealed test tank 1, and then a corrosive solution is added, and the solution covers the specimen 2. Before the test, only inert gas is transported using the gas delivery device 4 to remove oxygen and ensure that the dissolved oxygen content is less than 10 ppb. In addition, during the process of the gas delivery device transporting gas, the excess gas passes through the exhaust gas treatment device and is discharged after being harmlessly treated by the exhaust gas treatment device. At the start of the test, the solution dropping device 3 is used to quantitatively transport the corrosion medium regulating solution, and the corrosion medium regulating solution can be hydrochloric acid. After the corrosion medium regulating solution is dropped, the gas delivery device 4 is used to transport inert gas or corrosive gas to uniformly mix the solution. Throughout the process, the detection and acquisition device continuously detects the pH value and dissolved oxygen content of the solution, and the corrosion medium regulating solution of the solution dropping device 3 is used to control the pH value within the target range, not exceeding 0.2 pH units of the target value, to maintain the stability and controllability of the test conditions. The corrosive gas can be H 2 S, and of course, it can also be other different corrosive gases. The inert gas can be N 2， Of course, it can also be other different inert gases. The detection part 51 of the detection and acquisition device includes a pH sensor and a dissolved oxygen sensor, and both the pH sensor and the dissolved oxygen sensor are immersed in the solution. A display connected to the controller is also provided in the specimen corrosion test device, which is respectively connected to the solution dropping device 3, the gas delivery device 4, and the detection and acquisition device. The display is used to display the pH value and dissolved oxygen content acquired by the acquisition part 52 of the detection and acquisition device.

[0055] Specifically, as Figure 1 shown, the detection unit 51 includes a pH sensor and a dissolved oxygen sensor;

[0056] The acquisition unit 52 is a controller;

[0057] The controller is respectively connected to the solution dropping device 3 and the gas delivery device 4. The controller is adapted to control the actions of the solution dropping device 3 and the gas delivery device 4 according to the pH value collected by the pH sensor and the dissolved oxygen content collected by the dissolved oxygen sensor.

[0058] In this embodiment, as Figure 1 shown, specifically, the controller can be connected to the liquid control valve of the solution dropping device 3 and the control valve 44 of the gas delivery device 4. By controlling the corresponding liquid control valve, the adjustment of the solution for transporting the corrosive medium is realized, and by controlling the control valve 44, the adjustment of the corrosive gas and the inert gas introduced is realized. The controller can be a PLC or a single-chip microcomputer.

[0059] Specifically, as Figure 1 shown, the tail gas treatment device can have the following structure, including:

[0060] A gas treatment container 61, in which a neutralization solution is provided;

[0061] The gas output pipe 12 of the sealed test tank 1 is connected to the gas treatment container 61, and the outlet end of the gas output pipe 12 extends below the liquid level of the neutralization solution;

[0062] The upper part of the gas treatment container 61 is provided with an air outlet 62, and the air outlet 62 is adapted to discharge the treated gas.

[0063] Specifically, as Figure 1 shown, the neutralization solution in the gas treatment container 61 is an aqueous sodium hydroxide solution.

[0064] In this embodiment, as Figure 1 shown, the tail gas treatment device is mainly used to treat the harmful gases generated during the corrosion test to ensure the safety and environmental protection of the test. The gas treatment container 61 is filled with an aqueous sodium hydroxide solution as a neutralizing agent, which can effectively neutralize acidic gases such as hydrogen sulfide. The outlet end of the gas output pipe 12 extends below the liquid level to ensure that the waste gas is fully in contact with the neutralization solution, improving the treatment efficiency. The concentration of the aqueous sodium hydroxide solution can be a 10% sodium hydroxide neutralization solution.

[0065] During the test operation, the waste gas discharged from the sealed test tank 1 enters the gas treatment container 61 through the gas output pipe 12 and reacts fully with the neutralization solution. The treated gas is discharged from the upper air outlet 62, greatly reducing the emission of harmful gases and protecting the operators and the environment.

[0066] In addition, an activated carbon filter device can be added at the air outlet 62 to further adsorb the residual harmful gases and achieve more thorough tail gas treatment.

[0067] Specifically, as Figure 1 shown, the tail gas treatment device further includes a backflow prevention device 63;

[0068] Among them, the backflow prevention device 63 is arranged between the gas output pipe 12 of the gas treatment container 61 and the sealed test tank 1;

[0069] The backflow prevention device 63 is adapted to prevent the neutralization solution in the gas treatment container 61 and the outside gas from flowing back into the sealed test tank 1.

[0070] In this embodiment, as Figure 1 shown, the main function of the backflow prevention device 63 is to prevent the neutralization solution in the gas treatment container 61 and the outside air from flowing back into the sealed test tank 1. The backflow prevention device 63 effectively ensures the purity and stability of the test environment.

[0071] During use, the backflow prevention device 63 can be an empty sealed container. The gas output pipe 12 of the sealed test tank 1 and the inlet for entering the gas treatment container 61 are both connected into the sealed container. The height of the outlet of the gas output pipe 12 of the sealed test tank 1 is lower than the height of the inlet for entering the gas treatment container 61.

[0072] In addition, the backflow prevention device 63 can also be in the form of a check valve. When the pressure in the sealed test tank 1 is higher than the outside, the waste gas is discharged normally; when the internal pressure decreases, the backflow prevention device 63 automatically closes to prevent reverse airflow. This design not only prevents the backflow of the neutralization solution but also avoids the entry of outside air into the sealed test tank 1 and affects the test results.

[0073] Specifically, as Figure 1 shown, the specimen corrosion test device further includes an annular sealing ring 7;

[0074] An annular groove matching the annular sealing ring 7 is provided on the peripheral edge of the notch of the sealed test tank 1;

[0075] The annular sealing ring 7 is embedded in the annular groove 14 of the sealed test tank 1.

[0076] In this embodiment, as Figure 1 shown, the annular sealing ring 7 ensures the sealing performance of the test device, effectively prevents the leakage of corrosive gases and solutions during the test, and can also prevent outside air from entering the test environment, ensuring the stability and controllability of the test conditions.

[0077] In practical applications, the annular sealing ring 7 can be made of an elastic material that is corrosion-resistant and high-temperature resistant, such as fluororubber or silicone rubber. During installation, the annular sealing ring 7 is pressed into the annular groove 14. When the test tank cover is closed, the sealing ring will be deformed under pressure, thereby filling the gap between the tank cover and the test tank to form a tight sealing effect.

[0078] Specifically, as Figure 1 shown, the gas delivery device 4 can have the following structure, including:

[0079] The main pipeline 41, one end of the main pipeline 41 is connected to the gas inlet pipe 11 of the sealing test tank 1;

[0080] Two branch pipes, the two branch pipes are respectively connected to the other end of the main pipeline 41;

[0081] One of the branch pipes is suitable for connecting to a corrosive gas source, and the other branch pipe is suitable for connecting to an inert gas source;

[0082] Control valves 44 are provided on both branch pipes, and the control valves 44 are suitable for adjusting the flow rate of the corresponding gas.

[0083] Specifically, as Figure 1 shown, the sample corrosion test device further includes a one-way valve, and the one-way valve is arranged on the control valve 44.

[0084] In this embodiment, as Figure 1 shown, the gas delivery device 4 can be connected to both corrosive gas and inert gas at the same time, and different gases can be flexibly allocated through the main pipeline 41 and the branch pipes. This enables the test to be carried out under multiple gases, greatly increasing the applicable range of the test.

[0085] The setting of the control valve 44 on each branch pipe enables the operator to accurately control the flow rate of various gases. This can not only accurately simulate different corrosion environments, but also quickly switch the gas type or adjust the gas ratio when needed. For example, inert gas can be introduced first to remove the dissolved oxygen in the solution, and then corrosive gas can be introduced to start the corrosion test.

[0086] The one-way valve is arranged on the control valve 44 to prevent the gas from flowing back in the pipeline, especially to prevent the corrosive gas from entering the inert gas pipeline, avoiding cross-contamination and potential safety hazards.

[0087] In some embodiments, the number of branch pipes is not limited to two and can be set according to specific requirements.

[0088] Specifically, as Figure 1 shown, the sample corrosion test device further includes a sample carrier 8. Three support columns are provided on the sample carrier 8, and the support columns support between the sample carrier 8 and the bottom of the sealing test tank 1 to form a gap between the sample carrier 8 and the bottom of the sealing test tank 1;

[0089] The upper surface of the specimen carrier 8 is a specimen bearing surface, and the specimen bearing surface is adapted to place the specimen 2.

[0090] Specifically, as Figure 1 shown, the specimen carrier 8 is made of plexiglass material.

[0091] In this embodiment, as Figure 1 shown, the function of the specimen carrier 8 is to ensure the accuracy of the test and the uniform corrosion of the specimen 2. The setting of the three support columns not only provides stable support, but also forms a gap between the specimen carrier 8 and the bottom of the sealed test tank 1. This design allows the corrosion solution to flow fully, ensuring that all parts of the specimen can come into full contact with the corrosive solution.

[0092] The specimen carrier 8 made of plexiglass material can withstand a variety of corrosive solutions, will not react with the test medium, and avoids interfering with the test results. At the same time, the transparency of plexiglass enables the operator to clearly observe the state changes of the specimen during the test. In addition, plexiglass also has good insulation properties, which can effectively prevent possible galvanic corrosion between the specimen and the bottom of the test tank.

[0093] In some embodiments, the number of support columns is not limited to three and can be set according to specific requirements.

[0094] Specifically, as Figure 1 shown, the solution dropping device 3 includes a corrosion medium regulating solution container and a liquid control valve. The corrosion medium regulating solution container contains a corrosion medium regulating solution. The corrosion medium regulating solution container is connected to the sealed test tank 1 through a pipeline, and the liquid control valve is installed on the pipeline between the corrosion medium regulating solution container and the sealed test tank 1.

[0095] In some embodiments, the solution dropping device 3 can also use a combination of a metering pump and a solution storage container to achieve quantitative delivery of the corrosion medium regulating solution.

[0096] Specifically, as Figure 1 shown, the specimen 2 has a C-shaped ring structure, and each end is provided with a through hole;

[0097] The specimen corrosion test device further includes a specimen clamping device 9. The specimen clamping device 9 can have the following structure, including;

[0098] A screw rod that passes through the through holes at both ends of the specimen 2;

[0099] Nuts that are threadedly connected to both ends of the screw rod;

[0100] The specimen 2 is vertically placed in the sealed test tank 1 through the screw rod and the nuts.

[0101] In this embodiment, as Figure 1 shown, the specimen 2 is a corrosion-resistant pipe, and the sampling of the corrosion-resistant pipe is in a C-shaped ring structure. The C-shaped ring structure not only increases the surface area of the specimen 2, but also can simulate the curved surface state of the inner wall of the actual pipeline, making the test results more valuable for practical applications.

[0102] The screw of the specimen clamping device 9 passes through the through holes at both ends of the specimen and is fixed by nuts. This method not only ensures the stability of the specimen 2, but also facilitates installation and disassembly. The vertical placement method ensures that the specimen 2 can be evenly exposed to the corrosive solution, avoiding the problem of uneven local corrosion that may occur in the horizontal placement.

[0103] The specific embodiments described above further elaborate on the technical problems solved, technical solutions, and beneficial effects of the present utility model. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A sample corrosion test device, characterized in that: include: A sealed test tank (1), wherein the sealed test tank (1) is suitable for containing a corrosion solution and placing a sample (2), and the sealed test tank (1) is provided with a gas input pipe (11), a gas output pipe (12) and a solution dripping pipe (13); The outlet of the gas input pipe (11) and the sample (2) are both immersed in the solution of the sealed test tank (1); A solution dripping device (3), the solution dripping device (3) is connected to the solution dripping tube (13) of the sealed test tank (1) through a pipeline, and the solution dripping device (3) is suitable for quantitatively transporting the corrosive medium regulating solution into the sealed test tank (1); A gas delivery device (4), the gas delivery device (4) being connected to a gas input pipe (11) of the sealing test tank (1) via a gas path, the gas delivery device (4) being suitable for introducing corrosive gas and / or inert gas into the sealing test tank (1); A detection and collection device, the detection and collection device comprising a detection portion (51) arranged in the solution of the sealed test tank (1) and a collection portion (52) arranged outside the sealed test tank (1), the detection portion (51) being electrically connected to the collection portion (52), and the collection portion (52) being suitable for collecting the pH value and dissolved oxygen content of the solution in the sealed test tank (1) detected by the detection portion (51); An exhaust gas treatment device is connected to the gas output pipe (12) of the sealing test tank (1) through a gas path, and the exhaust gas treatment device is suitable for treating the gas discharged from the sealing test tank (1).

2. The sample corrosion test device according to claim 1, characterized in that: The detection unit (51) includes a pH sensor and a dissolved oxygen sensor; The collecting unit (52) is a controller; The controller is connected to the solution dripping device (3) and the gas conveying device (4) respectively, and is suitable for controlling the action of the solution dripping device (3) and / or the action of the gas conveying device (4) according to the pH value collected by the pH sensor and the dissolved oxygen content collected by the dissolved oxygen sensor.

3. The sample corrosion test device according to claim 1, characterized in that: The tail gas treatment device comprises: A gas processing container (61), wherein a neutralizing solution is provided in the gas processing container (61); The gas output pipe (12) of the sealed test tank (1) is connected to the gas processing container (61), and the outlet end of the gas output pipe (12) extends below the liquid level of the neutralization solution; The gas processing container (61) is provided with a gas outlet (62) at the top, and the gas outlet (62) is suitable for discharging the processed gas.

4. The sample corrosion test device according to claim 3, characterized in that: The tail gas treatment device further includes a backflow prevention device (63); Wherein, the backflow prevention device (63) is arranged between the gas processing container (61) and the gas output pipe (12) of the sealing test tank (1); The backflow prevention device (63) is suitable for preventing the neutralization solution and external gas in the gas processing container (61) from flowing back into the sealed test tank (1).

5. The sample corrosion test device according to claim 1, characterized in that: Also includes an annular sealing ring (7); The sealing test groove (1) is provided with an annular groove matching the annular sealing ring (7) at the periphery of the groove opening; The annular sealing ring (7) is embedded in the annular groove (14) of the sealing test groove (1).

6. The sample corrosion test device according to claim 1, characterized in that: The gas delivery device (4) comprises: A main pipeline (41), one end of which is connected to the gas input pipe (11) of the sealing test tank (1); at least two branch pipes, the two branch pipes being respectively connected to the other end of the main pipe (41); One of the branch pipes is suitable for connecting to a corrosive gas source, and the other branch pipe is suitable for connecting to an inert gas source; The branch pipes are each provided with a control valve (44), and the control valve (44) is suitable for adjusting the flow of the corresponding gas.

7. The sample corrosion test device according to claim 6, characterized in that: It also includes a one-way valve, which is arranged on the control valve (44).

8. The sample corrosion test device according to claim 1, characterized in that: It also includes a sample bearing platform (8), on which a plurality of support columns are provided, and the support columns are supported between the sample bearing platform (8) and the bottom of the sealing test tank (1), so that a gap is formed between the sample bearing platform (8) and the bottom of the sealing test tank (1); The upper surface of the sample bearing platform (8) is a sample bearing surface, and the sample bearing surface is suitable for placing the sample (2).

9. The sample corrosion test device according to claim 1, characterized in that: The solution dropping device (3) comprises a corrosive medium regulating solution container and a liquid control valve. The corrosive medium regulating solution container contains a corrosive medium regulating solution. The corrosive medium regulating solution container is connected to the sealing test tank (1) through a pipeline. The liquid control valve is installed on the pipeline between the corrosive medium regulating solution container and the sealing test tank (1).

10. The sample corrosion test device according to claim 1, characterized in that: The sample (2) is in a C-shaped ring structure, with a through hole at each end; It also includes a sample clamping device (9), the sample clamping device (9) comprising: A screw rod, the screw rod passing through the through holes at both ends of the sample (2); A nut, wherein the nut is threadedly connected to both ends of the screw; The sample (2) is placed vertically in the sealing test tank (1) via the screw rod and the nut.

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