Accelerated corrosion test device and method for simulating semi-closed area environment

Abstract

The invention discloses a test device and method for simulating accelerated corrosion in a semi-closed area environment. The test device comprises a box body, a supporting frame, a semi-closed test bin, a salt mist spraying assembly, a heating assembly, a humidifying assembly, a control system and the like. The semi-closed test bin is made of ABS resin, polycarbonate, nylon, polyether-ether-ketone and other materials through 3D printing and is fixed in the box body through a supporting frame, the periphery of the test bin body is of an inverted-V-shaped louver-shaped structure, the height H of a triangle formed by louvers and the distance h between the louvers meet the condition that H / h is larger than or equal to 1 and smaller than or equal to 2, and the distance h between the louvers can be adjusted according to the salt deposition amount in the bin. The top is provided with a separable waterproof box cover, and the bottom is provided with a drainage groove. The test method comprises: (1) designing an acceleration test spectrum; (2) checking the state of the device and preparing a salt solution; (3) placing a semi-closed test bin; (4) placing the test piece in a semi-closed test bin, and carrying out an accelerated corrosion test according to an accelerated corrosion test spectrum; 5, taking out the test piece and analyzing the surface corrosion condition. According to the technical scheme, the semi-closed test bin is adopted to simulate the actual semi-closed condition, the accelerated test spectrum is designed according to the equivalent conversion of the natural environment spectrum of the actual environment, and the salt deposition amount in the bin is regulated by regulating the parameters of the louver structure, so that the accelerated corrosion simulation in the semi-closed environment is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of corrosion testing, and in particular to a device and method for simulating accelerated corrosion testing in a semi-enclosed area environment. Background Art

[0002] Metal materials and structures exposed to the atmospheric environment will be affected by the combined influence of various external environmental factors and will corrode. In particular, the corrosion problem will become more prominent in the marine atmosphere due to the effects of high temperature, high humidity, and high salt spray. The traditional method for studying the corrosion mechanism and laws of materials in atmospheric corrosion environments is outdoor exposure tests in natural environments. However, natural environment tests have long cycles, slow data recovery, and require a lot of manpower and material resources. Therefore, in the field of engineering technology, in order to shorten the test cycle and improve test reproducibility, accelerated corrosion test methods are often used to simulate and evaluate the corrosion resistance of materials or components in natural environments.

[0003] According to the corrosion mechanism of metal materials and components, continuous exposure to damp heat, salt spray, alternating dry and hot conditions, and potential acidic atmospheres are the primary factors contributing to corrosion. Accelerated testing based on these environmental factors has long been a hot topic in this field. Accelerated testing methods include damp heat testing, salt spray testing, cyclic spray testing, and combined cycle testing. Currently, combined cycle testing is most commonly used, following the sequence of actual environmental factors. This is an accelerated testing method that uses the equivalent conversion of the natural environmental spectrum of the intended simulated environment. Accelerated cycle testing is typically conducted indoors, exposing material specimens or workpieces to a corrosive medium to accelerate the corrosion process.

[0004] However, in actual engineering components, not all are directly exposed to rain, dew, and salt deposition. Many are located in semi-enclosed environments, such as artillery gun cases, electromechanical control cabinets, engine compartments, and ship cabins. For example, the automatic gun case mechanism, while not directly exposed to the open air due to its location within a semi-enclosed case, can still corrode in marine environments due to air convection, especially the breathing effect generated by the automatic mechanism during operation. Existing technologies often use accelerated testing with components directly exposed to corrosive media. Accelerated test profiles are designed based on the humidity and salt deposition levels of similar environments, such as warehouses. However, these tests often fail to accurately simulate the corrosion found in actual semi-enclosed environments. Summary of the Invention

[0005] The purpose of the present invention is to invent a device and method for simulating accelerated corrosion testing in a semi-enclosed area environment. On the basis of ordinary accelerated corrosion tests, a semi-enclosed test chamber is used to simulate actual semi-enclosed conditions. The amount of salt deposition in the chamber is controlled by adjusting the louver structure parameters to achieve accelerated corrosion simulation in a semi-enclosed environment.

[0006] The technical solutions of the present invention are as follows:

[0007] According to a first aspect of the technical solution of the present invention, there is provided a device for accelerated corrosion testing in a simulated semi-enclosed area environment, comprising a box, a support frame, a semi-enclosed test chamber, a salt spray assembly, a heating assembly, a humidifying assembly, and a control system;

[0008] The semi-enclosed test chamber is fixed in the box by a support frame. The test chamber is provided with a louver structure around the periphery, a detachable waterproof box cover on the top, and a drainage groove on the bottom. The distance between the test chamber and the box wall is not less than 1 / 10 of the box side length. The control system controls the salt spray, temperature and humidity in the box through programmed settings.

[0009] Furthermore, the louvers around the semi-enclosed test chamber are in an inverted V shape, and the triangle height H, louver spacing h, louver wall thickness B, louver leaf thickness D, and louver gap d formed by the louver satisfy

[0010] Furthermore, the distance h between the louvers around the semi-enclosed test chamber can be adjusted according to the amount of salt deposition in the chamber, and the height H of the triangle formed by the louvers and the distance h between the louvers satisfy 1≤H / h≤2;

[0011] Furthermore, the semi-enclosed test chamber is manufactured by 3D printing using one or more materials selected from ABS resin, PETG plastic, polycarbonate, nylon, polyetheretherketone, and polytetrafluoroethylene.

[0012] Furthermore, the salt spray assembly, heating assembly, and humidifying assembly are respectively connected to the control system for communication, so as to realize real-time control of the state in the box and the accelerated corrosion test spectrum can be controlled by the control system program.

[0013] Furthermore, the salt mist spray assembly includes, from bottom to top, a brine tank, a gas or brine delivery pipeline, and an atomizing nozzle. Compressed gas passes through the atomizing nozzle, and negative pressure is generated at the small hole of the atomizing nozzle due to the Bernoulli effect, which continuously sucks the liquid in the brine tank back into the atomizing nozzle and sprays it out to form atomized salt mist.

[0014] Furthermore, two semi-enclosed test chambers are provided in the box, and the salt spray assembly is provided between the two semi-enclosed test chambers.

[0015] Furthermore, the atomizing nozzle is higher than the detachable waterproof box cover of the semi-enclosed test chamber.

[0016] Furthermore, the heating assembly includes a heating element and a temperature sensor, and the heating assembly is fixed in the box body to realize temperature detection and control in the box.

[0017] Furthermore, the heating component is arranged at the lower part of the support frame.

[0018] Furthermore, the humidifying component includes a humidity sensor, a humidifying element and a dehumidifying element. When the humidity is lower than a set value, the humidifying element adds water vapor into the box to increase the humidity; when the humidity is higher than the set value, the dehumidifying element starts to reduce the humidity.

[0019] Furthermore, the humidifying component is arranged inside the box body, and the relative distance from the semi-enclosed test chamber is at least 15 cm.

[0020] According to a second aspect of the technical solution of the present invention, there is provided a method for accelerated corrosion testing in a simulated semi-enclosed area environment using the apparatus described above, the method comprising the following steps:

[0021] S1: Design accelerated test spectrum based on the natural environment spectrum equivalent conversion of actual environment;

[0022] S2: Check the status of the salt spray assembly, heating assembly, and humidification assembly, and prepare the salt solution required for the test;

[0023] S3: Adjust the louver spacing h around the semi-enclosed test chamber and place the semi-enclosed test chamber as a whole on the box support frame;

[0024] S4: Place the specimen in a semi-enclosed test chamber with the tested surface at an angle of 15° to 25° to the vertical direction;

[0025] S5: Set the control program in the control system according to the accelerated corrosion test spectrum and conduct the accelerated corrosion test;

[0026] S6: Take out the specimens after the accelerated corrosion test at different stages and analyze the surface corrosion conditions.

[0027] Beneficial effects of the present invention:

[0028] The present invention provides an accelerated corrosion test device and method for simulating a semi-enclosed area environment. A semi-enclosed test chamber is used to simulate actual semi-enclosed conditions. An accelerated test spectrum is designed based on equivalent conversion of the natural environment spectrum of the actual environment. The amount of salt deposition in the chamber is controlled by adjusting the louver structure parameters to achieve accelerated corrosion simulation in a semi-enclosed environment.

[0029] Specifically, placing the sample in a semi-enclosed chamber for accelerated corrosion testing can effectively prevent salt spray droplets from being directly sprayed on the sample surface, while allowing the salt-containing medium to enter the semi-enclosed chamber through convection. By adjusting the louver structure parameters, the salt spray deposition rate in the chamber is optimized and regulated, thereby accelerating the corrosion process and obtaining a surface corrosion morphology close to the actual working conditions.

[0030] The semi-enclosed test chamber is secured within the chamber by a support frame. It features an inverted V-shaped louver structure around the perimeter, a detachable waterproof lid on the top, and drainage grooves at the bottom. The perimeter of the chamber is at least 1 / 10 of the chamber's side length. Atomized salt spray droplets released by the elevated salt spray assembly naturally settle under gravity, with some tiny droplets carried by the airflow into the semi-enclosed chamber through the louvers. During this process, the chamber's tilted exterior, with a low profile and a high interior, and its interior, with a high profile and a low profile, prevents salt spray / water mist from directly impacting the specimen and workpiece surfaces along with strong convective air currents. Ultimately, a uniform salt spray atmosphere is formed within the confined space. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the accelerated corrosion test device simulating a semi-enclosed area environment, where 1-box, 2-support frame, 3-semi-enclosed test chamber, 4-salt spray assembly, 5-heating assembly, 6-humidification assembly, 7-control system;

[0032] Figure 2 This is a schematic diagram of the shutter structure of the semi-enclosed test chamber;

[0033] Figure 3 This is the surface corrosion morphology of the sample after the accelerated corrosion test in a simulated semi-enclosed area environment. DETAILED DESCRIPTION

[0034] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Traditional accelerated corrosion tests generally expose specimens directly to a corrosive medium environment. Since the salt spray droplets sprayed by the salt spray assembly will be sprayed directly on the specimen surface, the components in the actual working conditions are in a semi-closed environment. Under the action of gravity, the specimens in the accelerated corrosion test are prone to groove-like corrosion marks of varying depths formed by the directional flow of salt spray droplets. Therefore, even if the accelerated test spectrum is designed according to the actual salt deposition amount in the semi-closed environment, it is difficult to obtain a corrosion state close to the actual environment through accelerated corrosion testing.

[0036] In actual working conditions, the surfaces of components in a semi-enclosed environment will not directly contact the salt spray liquid during operation. Through gas exchange, the surface of the component is placed in a salt spray atmosphere and is uniformly corroded. In the present invention, the sample is placed in a semi-enclosed chamber for accelerated corrosion testing, which can effectively prevent salt spray droplets from being directly sprayed on the surface of the sample, while allowing the salt-containing medium to enter the semi-enclosed chamber through convection, and by adjusting the parameters of the louver structure, the salt spray deposition rate in the chamber is optimized and regulated, thereby accelerating the corrosion process and obtaining a surface corrosion morphology close to the actual working conditions. Traditional turning processing technology is difficult to produce semi-enclosed boxes with complex louver structures, while 3D printing technology can achieve complex shapes that are difficult to achieve with traditional manufacturing processes, while saving mold costs in small-batch production. The semi-enclosed test chamber is manufactured by 3D printing using acid-resistant, alkali-resistant and anti-swelling ABS resin, PETG plastic, polycarbonate, nylon, polyetheretherketone, polytetrafluoroethylene and other materials, thereby ensuring that the semi-enclosed chamber can meet long-term testing requirements.

[0037] The present invention relates to a device for simulating accelerated corrosion test in a semi-enclosed area environment. Figure 1 As shown, it consists of a box 1, a support frame 2, a semi-enclosed test chamber 3, a salt spray assembly 4, a heating assembly 5, a humidifying assembly 6, and a control system 7. The salt spray assembly 4 includes a salt water tank, a gas or salt water delivery pipeline, and an atomizing nozzle. Compressed gas passes through the nozzle, and a negative pressure is generated at the nozzle's small hole due to the Bernoulli effect, which continuously sucks the liquid in the salt spray tank back into the nozzle and sprays it out to form atomized salt mist; the heating assembly 5 includes a heating element and a temperature sensor. The heating assembly is fixed in the box and can realize the temperature detection and control in the box; the humidifying assembly 6 includes a humidity sensor, a humidifying element, and a dehumidifying element. When the humidity is lower than the set value, the humidifying element adds water vapor to the box to increase the humidity; when the humidity is higher than the set value, the dehumidifying element starts to reduce the humidity; the salt spray assembly, heating assembly, and humidifying assembly are respectively connected to the control system 7 for communication, which can realize real-time control of the state in the box and the accelerated corrosion test spectrum can be controlled by the control system program.

[0038] The semi-enclosed test chamber 3 is fixed to the box body by a support frame. The test chamber body is surrounded by a louver structure, a detachable waterproof box cover is installed on the top, and a drainage groove is installed on the bottom. The distance between the test chamber body and the box body wall is not less than 1 / 10 of the box body side length. The louver structure is an inverted V-shaped structure, that is, the outer side of the chamber is low outside and high inside, and the inner side of the chamber is high inside and low outside. This prevents salt spray / water mist from directly acting on the surface of the specimen and workpiece along the strong convection air. The louver structure parameters are as follows: Figure 2 As shown, the triangle height H, louver spacing h, louver wall thickness B, louver page thickness D, louver gap d meet Meeting this relationship ensures that H / h is within a specific range, ensuring no lateral airflow and sufficient convection. By adjusting the louver spacing h, the rate at which the salt spray environment diffuses into the chamber is controlled, ensuring uniform corrosion of the materials within the chamber at the desired rate. When H / h < 1, salt spray can enter the semi-enclosed test chamber directly through lateral airflow. However, when H / h > 1, the louver spacing is narrow, resulting in weak convection and less salt deposition within the chamber. Therefore, for corrosion of specimens within the chamber, the height H of the triangle formed by the louvers and the louver spacing h should satisfy 1 ≤ H / h ≤ 2. Atomized salt spray droplets released by the elevated salt spray assembly naturally settle under the influence of gravity. Some of these tiny droplets, driven by the airflow, pass through the surrounding louvers and enter the semi-enclosed test chamber. During this process, the chamber's tilted exterior, with a low outside and a high inside, and the interior, with a high inside and a low outside, prevent salt spray / water mist from directly impacting the specimen and workpiece surfaces along with strong convective airflow. Ultimately, a uniform salt spray atmosphere is formed within the confined space. The distance between the semi-enclosed test chamber and the chamber wall should be no less than 1 / 10 of the chamber's side length. This allows sufficient space for salt spray droplets to settle and rise around the chamber, then diffuse into the chamber to form a uniform salt spray atmosphere. The test surface of the specimen within the chamber is angled at 15° to 25° from vertical, ensuring full contact with the salt spray atmosphere and uniform corrosion.

[0039] Specifically, the technical solution of the present invention first provides a simulated semi-enclosed area environment accelerated corrosion test device, which includes a box, a support frame, a semi-enclosed test chamber, a salt spray spray component, a heating component, a humidification component and a control system.

[0040] The semi-enclosed test chamber is fixed in the box by a support frame. The test chamber is provided with a louver structure around the periphery, a detachable waterproof box cover on the top, and a drainage groove on the bottom. The distance between the test chamber and the box wall is not less than 1 / 10 of the box side length. The control system controls the salt spray, temperature and humidity in the box through programmed settings.

[0041] In a preferred embodiment, the salt spray assembly, heating assembly, and humidifying assembly are respectively connected to the control system for communication, so as to realize real-time control of the state in the box and the accelerated corrosion test spectrum can be controlled by the control system program.

[0042] In a preferred embodiment, the salt mist spray assembly includes, from bottom to top, a brine tank, a gas or brine delivery pipeline, and an atomizing nozzle. Compressed gas passes through the atomizing nozzle, and negative pressure is generated at the small hole of the atomizing nozzle due to the Bernoulli effect, which continuously sucks the liquid in the brine tank back into the atomizing nozzle and sprays it out to form atomized salt mist.

[0043] In a preferred embodiment, two semi-enclosed test chambers are provided in the box, and the salt spray assembly is provided between the two semi-enclosed test chambers.

[0044] In a preferred embodiment, the atomizing nozzle is higher than the detachable waterproof box cover of the semi-enclosed test chamber.

[0045] In a preferred embodiment, the heating assembly includes a heating element and a temperature sensor. The heating assembly is fixed in the box body to realize temperature detection and control in the box body.

[0046] In a preferred embodiment, the heating assembly is arranged at the lower part of the support frame.

[0047] In a preferred embodiment, the humidifying component includes a humidity sensor, a humidifying element and a dehumidifying element. When the humidity is lower than a set value, the humidifying element adds water vapor into the box to increase the humidity; when the humidity is higher than the set value, the dehumidifying element starts to reduce the humidity.

[0048] In a preferred embodiment, the humidifying component is arranged inside the box body, and the relative distance from the semi-enclosed test chamber is at least 15 cm.

[0049] In a preferred embodiment, the louvers around the semi-enclosed test chamber are in an inverted V shape, and the triangle height H, louver spacing h, louver wall thickness B, louver leaf thickness D, and louver gap d formed by the louver satisfy

[0050] In a preferred embodiment, the distance h between the louvers around the semi-enclosed test chamber can be adjusted according to the amount of salt deposition in the chamber, and the height H of the triangle formed by the louvers and the distance h between the louvers satisfy 1≤H / h≤2;

[0051] In a preferred embodiment, the semi-enclosed test chamber is manufactured by 3D printing using one or more materials selected from ABS resin, PETG plastic, polycarbonate, nylon, polyetheretherketone, and polytetrafluoroethylene.

[0052] The technical solution of the present invention also provides a method for accelerated corrosion testing in a simulated semi-enclosed area environment using the above-mentioned device, the method comprising the following steps:

[0053] S1: Design accelerated test spectrum based on the natural environment spectrum equivalent conversion of actual environment;

[0054] S2: Check the status of the salt spray assembly, heating assembly, and humidification assembly, and prepare the salt solution required for the test;

[0055] S3: Adjust the louver spacing h around the semi-enclosed test chamber, and place the semi-enclosed test chamber as a whole on the box support frame. The distance between the test chamber and the box wall should not be less than 1 / 10 of the box side length.

[0056] S4: Place the specimen in a semi-enclosed test chamber with the tested surface at an angle of 15° to 25° to the vertical direction;

[0057] S5: Set the control program in the control system according to the accelerated corrosion test spectrum and conduct the accelerated corrosion test;

[0058] S6: Take out the specimens after the accelerated corrosion test at different stages and analyze the surface corrosion conditions.

[0059] Example

[0060] A semi-enclosed test chamber was made by 3D printing using PETG plastic. The chamber was surrounded by a louver structure, with a detachable waterproof cover on the top and a drainage ditch on the bottom. The height of the louvers around the chamber was 210.0mm, and the louvers were in an inverted V shape. The louver wall thickness B was 20.0mm, and the louver leaf thickness D was 3.5mm. The height H of the louver triangle is 14.9 mm.

[0061] The accelerated corrosion test process in a simulated semi-enclosed area environment is as follows:

[0062] (1) An accelerated test spectrum was designed based on the environmental equivalent transformation of offshore platforms in the South China Sea. One test cycle consisted of a 3-day cyclic acid salt spray test, with four cycles. The spray solution in the cyclic acid salt spray test was a 5% NaCl + 0.1% Na2SO4 solution with a pH of 4.0, a temperature of (37±1)°C, and a cycle of 22 hours of spraying followed by 2 hours of ventilation and drying.

[0063] (2) Prepare 5% NaCl + 0.1% Na2SO4 solution and adjust the pH value to 4.0 with dilute hydrochloric acid; check the salt spray spray assembly and test whether the spray uniformity and deposition rate meet the standard requirements; check whether the salt spray chamber heating assembly and humidification assembly are in normal condition;

[0064] (3) Adjust the distance h between the louvers in the semi-enclosed warehouse to 10.0 mm, H / h = 1.49, the height H of the triangle formed by the louvers and the distance h between the louvers satisfy 1≤H / h≤2, according to At this time, the louver gap d is 3.6mm. Place the semi-enclosed test chamber as a whole on the box support frame; the distance between the chamber and the short side of the box is 200mm and the distance between the chamber and the long side of the box is 100mm, which is greater than 1 / 10 of the box side length.

[0065] (4) The specimen was placed in a semi-enclosed test chamber. The test material was 35CrNi2MoV, the specimen size was 100×50×2mm, and the tested surface was at an angle of 20° to the vertical direction.

[0066] (5) According to the accelerated corrosion test spectrum, that is, the cycle period is 22 hours of spraying and 2 hours of ventilation and drying, the control program is set in the control system to conduct the accelerated corrosion test.

[0067] Figure 3 This is the surface morphology of the corrosion sample. It can be observed that the rust on the sample surface is evenly distributed. There is no scar corrosion morphology formed by direct contact of the surface with salt spray droplets. There are no groove-like corrosion marks of varying depths formed by the directional flow of salt spray droplets on the surface. It is relatively close to the actual corrosion morphology in a semi-closed environment.

[0068] In summary, the present invention discloses an accelerated corrosion test device and method for simulating a semi-enclosed environment. The test device comprises a housing, a support frame, a semi-enclosed test chamber, a salt spray assembly, a heating assembly, a humidification assembly, and a control system. The semi-enclosed test chamber is 3D-printed using materials such as ABS resin, polycarbonate, nylon, polyetheretherketone, and polytetrafluoroethylene. It is secured to the housing via a support frame. The chamber is surrounded by an inverted V-shaped louver structure. The height H of the triangle formed by the louvers and the spacing h between the louvers satisfy 1 ≤ H / h ≤ 2. The louver spacing h can be adjusted based on the amount of salt deposited within the chamber. A detachable waterproof cover is installed on the top, and a drainage groove is provided on the bottom. The test method is as follows: ① Design an accelerated test profile; ② Check the device status and prepare the salt solution; ③ Place the semi-enclosed test chamber; ④ Place the specimen in the semi-enclosed test chamber and conduct an accelerated corrosion test according to the accelerated corrosion test profile; ⑤ Remove the specimen and analyze the surface corrosion. The technical solution of the present invention adopts a semi-enclosed test chamber to simulate actual semi-enclosed conditions, designs an accelerated test spectrum according to the equivalent conversion of the natural environment spectrum of the actual environment, and controls the amount of salt deposition in the chamber by adjusting the louver structure parameters to achieve accelerated corrosion simulation in a semi-enclosed environment.

[0069] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An accelerated corrosion test device simulating a semi-enclosed area environment, characterized by: Including box, support frame, semi-enclosed test chamber, salt spray assembly, heating assembly, humidification assembly and control system; The semi-enclosed test chamber is fixed in the box body by a support frame. The test chamber body is provided with a louver structure around it, a detachable waterproof box cover on the top, and a drainage groove on the bottom. The distance between the test chamber body and the box body wall is not less than 1 / 10 of the box body side length; The salt mist spray component, heating component and humidifying component are respectively connected to the control system for communication, and the control system controls the salt mist spray, temperature and humidity in the box through programmed settings.

2. The accelerated corrosion test device for simulating a semi-enclosed area environment according to claim 1, characterized in that: The louver structure around the semi-enclosed test chamber is in an inverted V shape. The triangle height H, louver spacing h, louver wall thickness B, louver leaf thickness D, and louver gap d formed by the louver must meet the following requirements:

3. The accelerated corrosion test device for simulating a semi-enclosed area environment according to claim 2, characterized in that: The spacing h between the louver-like structures around the semi-enclosed test chamber is adjusted according to the amount of salt deposition in the chamber. The height H of the triangle formed by the louvers and the spacing h between the louvers satisfy 1≤H / h≤2.

4. The accelerated corrosion test device for simulating a semi-enclosed area environment according to claim 1, characterized in that: The semi-enclosed test chamber is manufactured by 3D printing using one or more of ABS resin, PETG plastic, polycarbonate, nylon, polyetheretherketone, and polytetrafluoroethylene materials.

5. The accelerated corrosion test device for simulating a semi-enclosed area environment according to claim 1, characterized in that: The salt mist spray assembly comprises, from bottom to top, a salt water tank, a gas or salt water delivery pipeline, and an atomizing nozzle.

6. The accelerated corrosion test device for simulating a semi-enclosed area environment according to claim 5, characterized in that: Two semi-enclosed test chambers are provided in the box, and the salt spray assembly is provided between the two semi-enclosed test chambers; Wherein, the atomizing nozzle is higher than the detachable waterproof box cover of the semi-enclosed test chamber.

7. The accelerated corrosion test device for simulating a semi-enclosed area environment according to claim 1, characterized in that: The heating assembly includes a heating element and a temperature sensor, and the heating assembly is fixed in the box; Wherein, the heating component is arranged at the lower part of the support frame.

8. The accelerated corrosion test device for simulating a semi-enclosed area environment according to claim 1, characterized in that: The humidification component includes a humidity sensor, a humidification element and a dehumidification element. When the humidity is lower than the set value, the humidification element adds water vapor to the box to increase the humidity; when the humidity is higher than the set value, the dehumidification element starts to reduce the humidity.

9. The accelerated corrosion test device for simulating a semi-enclosed area environment according to claim 1, characterized in that: The humidifying component is arranged inside the box body, and is at a relative distance of at least 15 cm from the semi-enclosed test chamber.

10. A method for accelerated corrosion testing in a simulated semi-enclosed area environment, characterized in that: The method is operated based on the simulated semi-enclosed area environment accelerated corrosion test device according to any one of claims 1 to 9, and the method comprises the following steps: S1: Design accelerated test spectrum based on the natural environment spectrum equivalent conversion of actual environment; S2: Check the status of the salt spray assembly, heating assembly, and humidification assembly, and prepare the salt solution required for the test; S3: Adjust the louver spacing h around the semi-enclosed test chamber and place the semi-enclosed test chamber as a whole on the box support frame; S4: Place the specimen in a semi-enclosed test chamber with the tested surface at an angle of 15° to 25° to the vertical direction; S5: Set the control program in the control system according to the accelerated corrosion test spectrum and conduct the accelerated corrosion test; S6: Take out the specimens after the accelerated corrosion test at different stages and analyze the surface corrosion conditions.

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