Electrochemical corrosion experiment device and method based on temperature, humidity and thin liquid film thickness control

Abstract

The invention relates to an electrochemical corrosion experiment device and method based on temperature, humidity and thin liquid film thickness control. The device comprises a sealed electrolytic tank used for providing a sealed test space; the supporting seat is mounted in the sealed electrolytic tank, and a test groove is formed in the upper surface of the supporting seat; the three-electrode system is arranged on the sealed electrolytic tank and takes a tested sample as a working electrode, the tested sample is mounted in the supporting seat, and the upper surface of the tested sample is flush with the bottom surface of the testing groove; the temperature adjusting assembly and the humidity adjusting assembly are respectively used for adjusting the temperature and the humidity in the sealed electrolytic tank; and the liquid film thickness adjusting assembly is used for adjusting the thickness of the liquid film in the testing groove. Compared with the prior art, the device can simulate the corrosion test of the magnesium alloy material and other samples under different temperature and humidity environments and different thin liquid film thickness environments in the atmospheric environment.

Description

Technical Field

[0001] The invention belongs to the technical field of corrosion equipment and relates to an electrochemical corrosion experimental device and method based on temperature, humidity and thin liquid film thickness control. Background Art

[0002] At present, the general thin liquid film electrochemical corrosion experimental device under simulated atmospheric environment can test the electrochemical corrosion of magnesium alloy under different liquid film thickness conditions, but the device structure is complex, the manufacturing cost is high, the sample replacement operation is inconvenient, and it cannot simulate the changes in temperature and humidity at the same time.

[0003] For example, Chinese patent application CN109374520A discloses an electrochemical test system for atmospheric corrosion of metals under a flowing thin liquid film, comprising a frame, a solution control device, a flow rate control device and an electrolytic cell device; the frame comprises a solution pipeline connecting the solution control device, the flow rate control device and the electrolytic cell device; the solution control device comprises a liquid storage container, a sealing cover, an air inlet pipe, a test electrode and a liquid outlet pipe, the air inlet pipe extends from the air inlet hole into the liquid storage container, the test electrode and the liquid outlet pipe both extend into the liquid storage container, and the liquid outlet pipe is connected to the solution pipeline; the electrolytic cell device comprises an upper cover plate, a porous film and a lower bottom plate, the upper cover plate is encapsulated with a metal electrode to be tested, the lower bottom plate is encapsulated with a reference electrode and an auxiliary electrode, the metal electrode to be tested and the reference electrode are both connected to the through hole of the porous film; the lower bottom plate is provided with a liquid inlet hole and a liquid outlet hole, and the liquid inlet hole is connected to the solution pipeline. The test system of this patent has the following defects: 1. The test sample is encapsulated in resin, which is inconvenient to operate and it is not easy to make the surface of the test sample flush with the surface of the thin liquid film cover, resulting in inaccurate liquid film thickness; 2. The thin liquid film in the atmospheric environment is generally in a static state, and the thin liquid film formed under the flow of the solution is not a simulation of the thin liquid film state in the real atmospheric environment; 3. The existing test system cannot adjust the ambient humidity, and the entire test space is filled with solution, which cannot truly simulate the corrosion of the metal surface under different humidity conditions in the atmospheric environment. Summary of the invention

[0004] The purpose of the present invention is to provide an electrochemical corrosion experimental device and method based on temperature, humidity and thin liquid film thickness control to simulate the atmospheric environment, and to conduct corrosion tests on samples such as magnesium alloy materials under different temperature, humidity and thin liquid film thickness environments.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] One of the technical solutions of the present invention provides an electrochemical corrosion experimental device based on temperature, humidity and thin liquid film thickness control, comprising:

[0007] A sealed electrolytic cell for providing a closed test space, comprising an electrolytic cell body with an upper opening, and an electrolytic cell sealing cover sealingly covering the opening of the electrolytic cell body;

[0008] A support seat installed in the sealed electrolytic cell and having a test groove on its upper surface;

[0009] A three-electrode system is arranged on the sealed electrolytic cell and uses the tested sample as a working electrode, wherein the tested sample is installed in the support seat, and the upper surface of the tested sample is flush with the bottom surface of the test groove;

[0010] A temperature regulating component and a humidity regulating component for regulating the temperature and humidity inside the sealed electrolytic cell respectively;

[0011] And a liquid film thickness adjustment component for adjusting the thickness of the liquid film in the test groove, which includes a liquid film thickness measuring block installed inside the support seat and with the top flush with the bottom surface of the test groove, and a spiral micrometer arranged on the sealed electrolytic cell cover and adjustable up and down, and the liquid film thickness measuring block and the spiral micrometer are also connected to two connection ports of an external ohmmeter through wires.

[0012] Furthermore, the electrolytic cell sealing cover is also provided with a plurality of screw holes cooperating with the temperature regulating component, the humidity regulating component and the liquid film thickness regulating component, and when the screw holes are not in use, they are sealed by bolts matching the screw holes.

[0013] Furthermore, the bottom surface of the test groove on the support seat is processed with a sample threaded opening and a test block threaded opening that pass through from top to bottom, and the tested sample and the liquid film thickness measuring block are respectively arranged at the sample threaded opening and the test block threaded opening through sealing rings.

[0014] Furthermore, the sample threaded opening and the test block threaded opening are provided with adjustment bolts for adjusting the positions of the tested sample and the liquid film thickness measuring block.

[0015] Furthermore, at least two sealing rings are respectively mounted on the tested sample and the liquid film thickness measuring block.

[0016] Furthermore, the three-electrode system also includes an electrochemical workstation, and an AgCl reference electrode and a platinum wire electrode respectively connected to the electrochemical workstation and having their bottom ends contacting the bottom surface of the test groove.

[0017] Furthermore, the temperature regulating component includes a temperature control container filled with water, and a temperature control heating element arranged on the outer surface of the temperature control container.

[0018] Furthermore, the humidity adjustment component includes an air pump, a flow meter, a first saturated gas cylinder and a second saturated gas cylinder connected in sequence through pipelines. The first saturated gas cylinder also contains a saturated K2SO4 solution. An air inlet pipe and an air outlet pipe are also provided on the electrolytic cell sealing cover. The outlet end of the second saturated gas cylinder is also connected to the air inlet pipe.

[0019] Furthermore, the electrolytic cell sealing cover is also provided with a burette for providing a sodium chloride solution for forming a liquid film to the test groove.

[0020] Furthermore, the device includes an adjustment platform for adjusting the horizontal state of the tested sample.

[0021] The second technical solution of the present invention provides an electrochemical corrosion experimental method based on temperature, humidity and thin liquid film thickness control, which is based on the electrochemical corrosion experimental device as described above, and is characterized in that the method comprises the following steps:

[0022] (1) placing the test sample in the electrochemical corrosion experimental device, and adjusting the temperature adjustment component and the humidity adjustment component so that the temperature and humidity in the closed test space meet the set requirements;

[0023] (2) Adjust the screw micrometer so that it contacts the surface of the liquid film thickness test block. At this time, the ohmmeter displays conduction. Next, adjust the screw micrometer to rise so that the distance between the screw micrometer and the liquid film thickness test block reaches the required liquid film thickness. Then, drip the solution required to form the liquid film into the test groove. When the liquid surface contacts the screw micrometer, the ohmmeter displays conduction. At this time, the liquid film thickness reaches the set requirement.

[0024] (3) Start the three-electrode system, begin the electrochemical corrosion experiment on the test sample, and record the data.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1) The overall device is small in size, has good sealing performance, low cost, and is easy to disassemble and assemble. The support seat uses screw holes to fix the test sample, etc. The test sample can be directly placed in the support seat and positioned, and the test sample does not need to adopt traditional packaging methods.

[0027] 2) The positions of the three electrodes are fixed, the impedance of the solution is small each time it is tested, and the value is relatively constant, so reference calibration is generally not required.

[0028] 3) The temperature in the electrolytic cell can be controlled from 1 to 50 degrees Celsius, the relative humidity can reach 98%, the thickness of the thin liquid film can be from 10 to 1000 μm, and the surface area of ​​the magnesium alloy sample can be about 1 square centimeter.

[0029] 4) The support base is made of PTFE, which can withstand high and low temperatures and strong acid and alkali environments, so it can be used to simulate tests under different atmospheric conditions. The support base is designed to be detachable, and the height position of the test sample and the liquid film thickness measuring block is adjusted with bolts. The support base can be reused many times.

[0030] 5) It can not only be used for corrosion performance testing of magnesium alloy material samples, but also for electrochemical corrosion performance testing of other metal materials and alloy materials in simulated atmospheric environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 It is a schematic diagram of the screw hole positions of the electrolytic cell sealing cover;

[0033] Figure 3 This is a schematic diagram of the installation of the support base;

[0034] Figure 4 It is a schematic diagram of the explosion structure at the support seat position;

[0035] Description of the markings in the figure:

[0036] 1-air pump, 2-flow meter, 3-first saturated gas bottle, 4-second saturated gas bottle, 5-sealed electrolytic cell, 6-AgCl reference electrode, 7-burette, 8-electrochemical workstation, 9-platinum wire electrode, 10-screw micrometer, 11-ohmmeter, 12-gas outlet pipe, 13-temperature control heating element, 14-liquid film thickness measuring block, 15-test sample, 16-temperature control container, 17-adjusting platform, 18-support seat, 19-water, 20-glass cover, 21-inlet pipe, 22-K2SO4 saturated solution, 23-heating jacket, 24-working electrode clamp, 25-counter electrode clamp, 26-stainless steel electrode clamp, 27-thermohygrometer probe, 28-micro pH meter, 29-sealing ring, 30-adjusting bolt. DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0038] In the following implementation manners or examples, unless otherwise specified, functional components or structures are conventional components or conventional structures used in the art to achieve corresponding functions.

[0039] In order to simulate the corrosion test of magnesium alloy materials and other samples under different temperature, humidity and thin liquid film thickness environments in the atmospheric environment, the present invention provides an electrochemical corrosion experimental device based on temperature, humidity and thin liquid film thickness control. The structure of the device can be seen in Figures 1 to 4 As shown, including:

[0040] A sealed electrolytic cell 5 for providing a closed test space, comprising an electrolytic cell body with an upper opening, and an electrolytic cell sealing cover for sealingly covering the opening of the electrolytic cell body;

[0041] A support seat 18 installed in the sealed electrolytic cell 5 and having a test groove on the upper surface;

[0042] A three-electrode system is arranged on the sealed electrolytic cell 5 and uses the test sample 15 as a working electrode, wherein the test sample 15 is installed in the support seat 18, and the upper surface of the test sample 15 is flush with the bottom surface of the test groove;

[0043] A temperature regulating component and a humidity regulating component for regulating the temperature and humidity inside the sealed electrolytic cell 5 respectively;

[0044] And a liquid film thickness adjustment component for adjusting the thickness of the liquid film in the test groove, which includes a liquid film thickness measuring block 14 installed inside the support seat 18 and with the top flush with the bottom surface of the test groove, and a screw micrometer 10 arranged on the sealed electrolytic cell cover and adjustable up and down, and the liquid film thickness measuring block 14 and the screw micrometer 10 are also connected to two connection ports of an external ohmmeter 11 through wires.

[0045] In some specific implementations, please refer to Figure 2 As shown in the figures, the electrolytic cell sealing cover is also provided with a plurality of screw holes for cooperating with the temperature regulating component, the humidity regulating component and the liquid film thickness regulating component, and when the screw holes are not in use, they are sealed by bolts matching the screw holes.

[0046] In some specific implementations, please refer to Figure 4 As shown in the figure, the bottom surface of the test groove on the support seat 18 is processed with a sample threaded opening and a test block threaded opening that pass through from top to bottom, and the tested sample 15 and the liquid film thickness measuring block 14 are respectively arranged at the sample threaded opening and the test block threaded opening through a sealing ring 29. In a more specific embodiment, the sample threaded opening and the test block threaded opening are further provided with an adjustment bolt 30 for adjusting the position of the tested sample 15 and the liquid film thickness measuring block 14. In a more specific embodiment, at least two sealing rings 29 are respectively sleeved on the tested sample 15 and the liquid film thickness measuring block 14.

[0047] In some specific implementations, please refer to Figure 1As shown in FIG. 1 , the three-electrode system further includes an electrochemical workstation 8 , and an AgCl reference electrode 6 and a platinum wire electrode 9 which are respectively connected to the electrochemical workstation 8 and whose bottom ends contact the bottom surface of the test groove.

[0048] In some specific implementations, please refer to Figure 1 As shown in the figure, the temperature regulating assembly includes a temperature control container 16 containing water, and a temperature control heating element 13 arranged on the outer surface of the temperature control container 16. Specifically, the temperature control container 16 can be a beaker, and the temperature control heating element 13 can be a conventional commercially available heating element with temperature control function in the art, such as an automatic temperature control silicone heating sleeve.

[0049] In some specific embodiments, the humidity adjustment component includes an air pump 1, a flow meter 2, a first saturated gas cylinder 3 and a second saturated gas cylinder 4 which are connected in sequence through pipelines. The first saturated gas cylinder 3 also contains a K2SO4 saturated solution 22. An air inlet pipe 21 and an air outlet pipe 12 are also provided on the electrolytic cell sealing cover. The outlet end of the second saturated gas cylinder 4 is also connected to the air inlet pipe 21.

[0050] In some specific implementations, please refer to Figure 1 As shown in Figures 1 and 2, the electrolytic cell sealing cover is also provided with a burette 7 for providing a sodium chloride solution for forming a liquid film to the test groove.

[0051] In some specific implementations, please refer to Figure 1 As shown in FIG. 1 , the device includes an adjustment platform 17 for adjusting the horizontal state of the tested sample 15 .

[0052] In addition, the present invention also provides an electrochemical corrosion experimental method based on temperature, humidity and thin liquid film thickness control, which is based on the electrochemical corrosion experimental device as described above, and the method comprises the following steps:

[0053] (1) Place the test sample 15 in the electrochemical corrosion experimental device, and adjust the temperature adjustment component and the humidity adjustment component so that the temperature and humidity in the closed test space meet the set requirements;

[0054] (2) Adjust the screw micrometer 10 so that it contacts the surface of the liquid film thickness test block. At this time, the ohmmeter 11 displays conduction. Next, adjust the screw micrometer 10 to rise so that the distance between the screw micrometer 10 and the liquid film thickness test block reaches the required liquid film thickness. Then, drip the solution required to form the liquid film into the test groove. When the liquid surface contacts the screw micrometer 10, the ohmmeter 11 displays conduction. At this time, the liquid film thickness reaches the set requirement.

[0055] (3) Start the three-electrode system, start the electrochemical corrosion experiment on the test sample 15, and record the data.

[0056] The above embodiments may be implemented individually or in any combination of two or more.

[0057] The above implementation is described in more detail below in conjunction with specific examples.

[0058] Embodiment 1:

[0059] In order to simulate the corrosion test of magnesium alloy materials and other samples under different temperature, humidity and thin liquid film thickness environments in the atmospheric environment, the present invention provides an electrochemical corrosion experimental device based on temperature, humidity and thin liquid film thickness control. The structure of the device can be seen in Figures 1 to 4 As shown, including:

[0060] A sealed electrolytic cell 5 for providing a closed test space, comprising an electrolytic cell body with an upper opening, and an electrolytic cell sealing cover for sealingly covering the opening of the electrolytic cell body;

[0061] A support seat 18 installed in the sealed electrolytic cell 5 and having a test groove on the upper surface;

[0062] A three-electrode system is arranged on the sealed electrolytic cell 5 and uses the test sample 15 as a working electrode, wherein the test sample 15 is installed in the support seat 18, and the upper surface of the test sample 15 is flush with the bottom surface of the test groove;

[0063] A temperature regulating component and a humidity regulating component for regulating the temperature and humidity inside the sealed electrolytic cell 5 respectively;

[0064] And a liquid film thickness adjustment component for adjusting the thickness of the liquid film in the test groove, which includes a liquid film thickness measuring block 14 installed inside the support seat 18 and with the top flush with the bottom surface of the test groove, and a screw micrometer 10 arranged on the sealed electrolytic cell cover and adjustable up and down, and the liquid film thickness measuring block 14 and the screw micrometer 10 are also connected to two connection ports of an external ohmmeter 11 through wires.

[0065] Please see again Figure 2 As shown in the figure, the electrolytic cell sealing cover is also provided with a number of screw holes for working with the temperature regulating component, the humidity regulating component and the liquid film thickness regulating component, and when the screw holes are not in use, they are sealed with bolts matching the screw holes. Specifically, 9 screw holes can be set on the electrolytic cell sealing cover, corresponding to the AgCl reference electrode 6, the air inlet pipe 21, the burette 7, the screw micrometer 10, the stainless steel electrode clamp 26, the micro pH meter 28, the working electrode clamp 24, the air outlet pipe 12, and the counter electrode clamp 25. Among them, the air inlet pipe 21 and the air outlet pipe 12 are respectively installed in two smaller screw holes; the burette 7 is taken away after the titration setting is completed, and the thermometer and hygrometer probe 27 is installed in the same screw hole.

[0066] Please see again Figure 4 As shown in the figure, the bottom surface of the test groove on the support seat 18 is processed with a sample threaded opening and a test block threaded opening that pass through from top to bottom, and the tested sample 15 and the liquid film thickness measuring block 14 are respectively arranged at the sample threaded opening and the test block threaded opening through a sealing ring 29. In a more specific embodiment, the sample threaded opening and the test block threaded opening are further provided with an adjustment bolt 30 for adjusting the position of the tested sample 15 and the liquid film thickness measuring block 14. In a more specific embodiment, at least two sealing rings 29 are respectively sleeved on the tested sample 15 and the liquid film thickness measuring block 14.

[0067] Please see again Figure 1 As shown in FIG. 1 , the three-electrode system further includes an electrochemical workstation 8 , and an AgCl reference electrode 6 and a platinum wire electrode 9 which are respectively connected to the electrochemical workstation 8 and whose bottom ends contact the bottom surface of the test groove.

[0068] Please see again Figure 1 As shown in the figure, the temperature regulating assembly includes a temperature control container 16 containing water, and a temperature control heating element 13 arranged on the outer surface of the temperature control container 16. Specifically, the temperature control container 16 can be a beaker, and the temperature control heating element 13 can be a conventional commercially available heating element with a temperature control function in the art, such as an automatic temperature control silicone heating sleeve, etc., so that the temperature of the heated saturated gas can be set to be consistent with the required temperature of the test environment.

[0069] Please see again Figure 1 As shown in FIG. 1 , the humidity adjustment assembly includes an air pump 1, a flow meter 2, a first saturated gas cylinder 3, and a second saturated gas cylinder 4 connected in sequence through pipelines. The first saturated gas cylinder 3 also contains a saturated K2SO4 solution 22. An air inlet pipe 21 and an air outlet pipe 12 are also provided on the electrolytic cell sealing cover. The outlet end of the second saturated gas cylinder 4 is also connected to the air inlet pipe 21. Here, a heating jacket 23 can also be provided on the outside of the first saturated gas cylinder 3 to control the temperature.

[0070] Please see again Figure 1 As shown in Figures 1 and 2, the electrolytic cell sealing cover is also provided with a burette 7 for providing a sodium chloride solution for forming a liquid film to the test groove.

[0071] Please see again Figure 1 As shown in FIG. 1 , the device includes an adjustment platform 17 for adjusting the horizontal state of the tested sample 15 .

[0072] The test method using the test device of this embodiment specifically includes the following steps:

[0073] Step 1: Install four O-rings into the sample threaded openings and the test block threaded openings of the test groove of the support seat 18, install the test sample 15 (i.e. magnesium alloy sample) and the liquid film thickness measuring block 14 made of stainless steel onto the cylindrical support seat 18, adjust the adjustment bolt 30 until both are flush with the inner surface of the support seat 18, and embed the platinum wire electrode 9 into the support seat 18 (refer to Figure 3 ).

[0074] Step 2: Install the working electrode clamp 24, the counter electrode clamp 25, and the stainless steel electrode clamp 26 into the corresponding screw holes on the electrolytic cell sealing cover, and connect them with the test sample 15, the platinum wire electrode 9, and the liquid film thickness measuring block 14 with wires, and tighten the electrolytic cell sealing cover to seal it (refer to Figure 2 ).

[0075] Step 3: Install the AgCl reference electrode 6, the thermometer and humidity probe 27, the micro pH meter 28, the burette 7, and the gas outlet pipe 12 onto the sealing cover of the electrolytic cell (refer to Figure 2 ).

[0076] Step 4: Connect the air pump 1, the glass rotor flowmeter 2, the first saturated gas bottle 3, the second saturated gas bottle 4, and finally install the air inlet pipe 21 on the sealing cover of the electrolytic cell (refer to Figure 1 and Figure 2 ).

[0077] Step 5: Set the temperature controller of the automatic temperature control silicone heating sleeve (i.e., the temperature control heating element 13) and the heating sleeve 23 (an automatic temperature control silicone heating sleeve may also be used) to the required temperature, and turn on the power supply to control the temperature at the beginning of the test.

[0078] Step 6: Fill a beaker (i.e., temperature control container 16) with a certain amount of water 19, install a round glass cover 20, and place the sealed electrolytic cell 5. Then place the assembled device on the adjustment platform 17, and adjust the position bolts of the adjustment platform 17 to make the surface of the test sample 15 reach a level.

[0079] Step 7: The screw micrometer 10 is connected to the probe needle and extends into the surface of the liquid film thickness measuring block 14 fixed in the support seat 18. The micro-ohmmeter 11 is connected to the screw micrometer 10 and the stainless steel electrode clamp 27 (connected to the liquid film thickness measuring block 14 made of stainless steel) through a wire. The screw micrometer 10 is adjusted so that the probe needle contacts the surface of the liquid film thickness measuring block 14, and the micro-ohmmeter 11 displays conduction. The screw micrometer 10 is adjusted to the required liquid film thickness. At this time, the micro-ohmmeter 11 displays disconnection. A 3.5% sodium chloride solution is dripped into the burette 7. When the liquid surface contacts the probe needle, the micro-ohmmeter 11 displays conduction. Stop dripping the sodium chloride solution, and the liquid film thickness reaches the set requirement.

[0080] Step 8: Connect the AgCl reference electrode 6, the working electrode clamp 24, and the counter electrode clamp 25 to the corresponding terminals on the electrochemical workstation 8 through wires, set the parameters, turn on the air pump 1, the automatic temperature control silicone heating jacket power supply, and assemble the thermometer and hygrometer probe 27 into the corresponding hole of the sealed electrolytic cell cover (such as Figure 2 As shown), start the electrochemical corrosion experiment and record the data.

[0081] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. An electrochemical corrosion experimental device based on temperature, humidity and thin liquid film thickness control, characterized in that: include: A sealed electrolytic cell for providing a closed test space, comprising an electrolytic cell body with an upper opening, and an electrolytic cell sealing cover sealingly covering the opening of the electrolytic cell body; A support seat installed in the sealed electrolytic cell and having a test groove on its upper surface; A three-electrode system is arranged on the sealed electrolytic cell and uses the tested sample as a working electrode, wherein the tested sample is installed in the support seat, and the upper surface of the tested sample is flush with the bottom surface of the test groove; A temperature regulating component and a humidity regulating component for regulating the temperature and humidity inside the sealed electrolytic cell respectively; And a liquid film thickness adjustment component for adjusting the thickness of the liquid film in the test groove, which includes a liquid film thickness measuring block installed inside the support seat and with the top flush with the bottom surface of the test groove, and a spiral micrometer arranged on the sealed electrolytic cell cover and adjustable up and down, and the liquid film thickness measuring block and the spiral micrometer are also connected to two connection ports of an external ohmmeter through wires.

2. The electrochemical corrosion experimental device based on temperature, humidity and thin liquid film thickness control according to claim 1 is characterized in that: The electrolytic cell sealing cover is also provided with a plurality of screw holes for cooperating with the temperature regulating component, the humidity regulating component and the liquid film thickness regulating component, and when the screw holes are not in use, they are sealed by bolts matching the screw holes.

3. The electrochemical corrosion experimental device based on temperature, humidity and thin liquid film thickness control according to claim 1 is characterized in that: The bottom surface of the test groove on the support seat is processed with a sample thread opening and a test block thread opening that pass through from top to bottom. The tested sample and the liquid film thickness measuring block are respectively arranged at the sample thread opening and the test block thread opening through sealing rings.

4. The electrochemical corrosion experimental device based on temperature, humidity and thin liquid film thickness control according to claim 3 is characterized in that: The sample threaded opening and the test block threaded opening are also provided with adjustment bolts for adjusting the positions of the tested sample and the liquid film thickness measuring block.

5. The electrochemical corrosion experimental device based on temperature, humidity and thin liquid film thickness control according to claim 3 is characterized in that: At least two sealing rings are respectively mounted on the tested sample and the liquid film thickness measuring block.

6. The electrochemical corrosion experimental device based on temperature, humidity and thin liquid film thickness control according to claim 1 is characterized in that: The three-electrode system also includes an electrochemical workstation, and an AgCl reference electrode and a platinum wire electrode respectively connected to the electrochemical workstation and having their bottom ends contacting the bottom surface of the test groove.

7. The electrochemical corrosion experimental device based on temperature, humidity and thin liquid film thickness control according to claim 1 is characterized in that: The temperature regulating component comprises a temperature control container filled with water and a temperature control heating element arranged on the outer surface of the temperature control container.

8. The electrochemical corrosion experimental device based on temperature, humidity and thin liquid film thickness control according to claim 1 is characterized in that: The humidity adjustment component includes an air pump, a flow meter, a first saturated gas cylinder and a second saturated gas cylinder which are connected in sequence through pipelines. The first saturated gas cylinder also contains a saturated K2SO4 solution. An air inlet pipe and an air outlet pipe are also provided on the sealing cover of the electrolytic cell. The outlet end of the second saturated gas cylinder is also connected to the air inlet pipe.

9. The electrochemical corrosion experimental device based on temperature, humidity and thin liquid film thickness control according to claim 1 is characterized in that: The electrolytic cell sealing cover is also provided with a burette for providing a sodium chloride solution for forming a liquid film to the test groove; The device comprises an adjusting platform for adjusting the horizontal state of the tested sample.

10. An electrochemical corrosion experiment method based on temperature, humidity and thin liquid film thickness control, which is based on the electrochemical corrosion experiment device according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: (1) placing the test sample in the electrochemical corrosion experimental device, and adjusting the temperature adjustment component and the humidity adjustment component so that the temperature and humidity in the closed test space meet the set requirements; (2) Adjust the screw micrometer so that it contacts the surface of the liquid film thickness test block. At this time, the ohmmeter displays conduction. Next, adjust the screw micrometer to rise so that the distance between the screw micrometer and the liquid film thickness test block reaches the required liquid film thickness. Then, drip the solution required to form the liquid film into the test groove. When the liquid surface contacts the screw micrometer, the ohmmeter displays conduction. At this time, the liquid film thickness reaches the set requirement. (3) Start the three-electrode system, begin the electrochemical corrosion experiment on the test sample, and record the data.

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