Salt mist simulation test cabinet

Abstract

The invention discloses a salt mist simulation test cabinet, and belongs to the technical field of environment simulation test equipment. The test cabinet comprises a main body frame system which is provided with a test cabin with a double-layer heat insulation structure and an inflation sealing door; the environment simulation system comprises a multi-mode spray tower capable of generating salt mist with different particle sizes and spraying modes, and a temperature and humidity control module composed of PTC heating, compressor refrigeration, electrode humidification and rotating wheel dehumidification; the fluid circulation system comprises a salt solution circulation unit with concentration monitoring and an air treatment unit with corrosive gas injection; the sample management system comprises an angle-adjustable rotary sample holder and an online monitoring unit integrating image, potential and weighing functions; and the intelligent control system is used for centralized control. The device supports multiple test modes such as circulating corrosion, composite simulation and dynamic spraying, realizes automation of a test process and in-situ monitoring of a sample state, and improves authenticity, accuracy and efficiency of a corrosion test.

Description

Technical Field

[0001] This invention relates to the field of environmental simulation testing equipment technology, and specifically to a salt spray simulation test cabinet. Background Technology

[0002] Salt spray corrosion is an important testing method for evaluating the corrosion resistance of materials, coatings, and products. Traditional salt spray test chambers typically only perform single, static salt spray tests (such as the neutral salt spray test (NSS) and the acetic acid salt spray test (AASS), with fixed and singular test conditions. However, corrosion processes in real-world environments are often the result of dynamic coupling of multiple factors, such as temperature cycles due to diurnal or seasonal changes, alternating wet and dry conditions, fluctuations in salt spray concentration, and the synergistic effects of corrosive gases such as SO2 and CO2 present in industrial atmospheres. Existing salt spray testing equipment generally suffers from the following technical deficiencies:

[0003] The testing mode is limited: it can only achieve salt spraying under constant conditions, and cannot simulate cyclic corrosion testing (CCT) which includes multiple alternating stages such as drying, wetting, and salt spraying, nor can it simulate a complex environment where temperature, humidity, salt spray, and corrosive gases change synchronously.

[0004] Insufficient control precision and flexibility: Salt spray has a uniform particle size, and the spray direction and intensity are not adjustable, making it difficult to simulate salt spray deposition under different wind speeds and directions. Temperature and humidity control has a slow response and limited precision.

[0005] Inefficient sample management: Sample racks are usually fixed in place, resulting in inconsistent testing conditions in different parts of the sample or between different samples; lack of real-time, in-situ monitoring capability for sample corrosion status, test results rely on final visual inspection or weight loss measurement, and process data is missing.

[0006] Low level of automation and intelligence: The testing process relies on manual setup and monitoring, data recording is discontinuous, and it is impossible to achieve automatic execution and remote monitoring of complex dynamic testing programs.

[0007] Therefore, developing a high-precision salt spray simulation test device that can integrate multiple environmental factors, achieve dynamic simulation, automated control, and online monitoring is of great significance for improving the accuracy, reliability, and efficiency of corrosion testing. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a salt spray simulation test cabinet and a dynamic cycle test method. This equipment can highly simulate a real and complex corrosion environment, realize multi-mode, programmable, and high-precision dynamic testing, and has advanced sample management and real-time monitoring functions.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a salt spray simulation test chamber, comprising: a main frame system including a double-layer test chamber, an observation window on the front of the test chamber, and a sealed door on one side; an environmental simulation system installed inside the test chamber for generating and regulating the test environment, including at least a multi-mode spray tower and a temperature and humidity control module; a fluid circulation system fluidly connected to the environmental simulation system for providing and processing the salt solution and air required for the test, including at least a salt solution circulation unit and an air handling unit; a sample management system rotatably disposed inside the test chamber for carrying and monitoring test samples, including at least a rotating sample holder and an online monitoring unit; and an intelligent control system electrically connected to the environmental simulation system, the fluid circulation system, and the sample management system for controlling the test process and collecting data.

[0010] Preferably, the test chamber includes: an inner layer plate made of corrosion-resistant polypropylene, an outer layer plate made of stainless steel, and a heat-insulating material layer filled between the inner layer plate and the outer layer plate; the edge of the sealed door is provided with an annular inflatable sealing strip, which is connected to a pressure-controllable air source.

[0011] Preferably, the multi-mode spray tower includes an ultrasonic atomization unit for generating micron-sized fine salt spray; a pneumatic spray unit for generating salt spray of conventional particle size; and a centrifugal spray unit for generating salt spray with controllable direction and intensity; the outlet pipelines of the ultrasonic atomization unit, the pneumatic spray unit, and the centrifugal spray unit are selectively connected to a common spray outlet through a three-way solenoid valve.

[0012] Preferably, the temperature and humidity control module includes a PTC ceramic heater installed on the inner wall of the test chamber, a compressor refrigeration unit connected to the outside of the test chamber, an electrode-type steam humidifier, and a rotary dehumidifier.

[0013] Preferably, the salt solution circulation unit includes a main storage tank with a concentration sensor inside for real-time detection of solution concentration; a magnetically driven circulation pump connected to the outlet of the main storage tank; and a multi-stage filter connected to the outlet pipeline of the circulation pump.

[0014] Preferably, the air handling unit includes an oil-free air compressor; an air saturator connected to the outlet of the air compressor for heating compressed air to a predetermined temperature; and a CO2 / SO2 mixing device connected to the outlet of the air saturator for meteringly injecting corrosive gas into the airflow.

[0015] Preferably, the rotating sample holder includes a vertically arranged rotating spindle driven by a servo motor; a multi-layered sample holder arranged along the axial direction of the rotating spindle; and an angle adjustment mechanism connected between the sample holder and the rotating spindle, the angle adjustment mechanism enabling the sample holder to tilt relative to the horizontal plane within a range of 15° to 90°.

[0016] Preferably, the online monitoring unit includes a high-definition camera fixed to the inner wall of the test chamber, with its lens pointing towards the rotating sample holder; a corrosion potential sensor disposed on at least one sample holder; and a high-precision weighing module integrated below the sample holder.

[0017] Preferably, the intelligent control system includes: an industrial programmable logic controller (PLC) as the core controller; a data acquisition module connected to the PLC for collecting environmental parameters; and a remote monitoring interface that supports remote communication.

[0018] A preferred dynamic cyclic testing method, applied to the above-mentioned salt spray simulation test chamber, includes the following steps:

[0019] S1. Preparation stage: Install the test sample on the rotating sample holder, prepare a salt solution of a predetermined concentration in the main storage tank, and select the test mode and set the parameters through the intelligent control system;

[0020] S2. Environment Construction Phase: Activate the temperature and humidity control module to bring the test chamber to the initial set temperature and humidity; according to the selected mode, activate the corresponding spray unit and air handling unit to bring the salt spray concentration and corrosive gas concentration in the chamber to the preset values.

[0021] S3. Dynamic Testing Phase:

[0022] If the cyclic corrosion test mode is selected, the system will execute the following sub-stages in a loop according to the preset program:

[0023] Salt spray sub-stage: The ultrasonic atomization unit is activated and continues for the first predetermined time;

[0024] Wetting sub-stage: Maintain or increase humidity, turn off the spray, and continue for the second predetermined time;

[0025] Drying sub-stage: Start the heater and dehumidifier to reduce humidity, continuing for the third predetermined time;

[0026] If the composite environment simulation mode is selected, the salt spray concentration, corrosive gas concentration and temperature will be controlled to change synchronously according to the preset curves.

[0027] If the dynamic spraying mode is selected, the rotating sample rack will start rotating at a constant speed, and the spray direction and intensity of the centrifugal spray unit will be dynamically adjusted with the rotation angle.

[0028] S4. Monitoring and Recording Stage: Throughout the testing process, the online monitoring unit collects sample images, corrosion potentials, and mass change data in real time, and the intelligent control system records all environmental parameters and sample response data.

[0029] S5. End Phase: After the preset test cycle is reached, all environmental simulation equipment will be automatically stopped and a test report will be generated.

[0030] Preferably, in the cyclic corrosion test mode of the S3 stage, the first predetermined time is 2 hours, the second predetermined time is 4 hours, and the third predetermined time is 2 hours, constituting a complete 8-hour test cycle.

[0031] Preferably, in the dynamic spraying mode of the S3 stage, the rotation speed of the rotating sample rack is 0.5 to 5 revolutions per minute, and the spray direction of the centrifugal spray unit is adjusted by a deflection nozzle driven by a stepper motor controlled by the intelligent control system.

[0032] The beneficial effects of this invention are as follows:

[0033] Highly realistic simulation with diverse testing modes: By integrating multi-mode spraying, wide-range high-precision temperature and humidity control, corrosive gas injection, and programmable dynamic cycle control, it can highly reproduce real complex corrosive environments, such as marine atmospheres, industrial atmospheres, alternating wet and dry conditions, and temperature cycles. It supports various testing modes including static salt spray, cyclic corrosion, composite environment simulation, and dynamic spraying, making its applications extremely wide-ranging.

[0034] High control precision and fast dynamic response: Utilizing a combination of PTC heating, compressor cooling, electrode humidification, and rotary dehumidification, along with closed-loop control of concentration and gas concentration, it achieves high precision (e.g., temperature ±0.5°C, humidity ±2%RH) and rapid stabilization of environmental parameters. The multi-mode spray tower can generate salt spray with different characteristics as needed, improving the flexibility and accuracy of testing.

[0035] Uniform sample exposure and real-time, comprehensive data: The rotating sample holder with an adjustable angle greatly improves the uniformity and comparability of sample testing. The integrated online monitoring system (image, potential, weighing) can collect sample corrosion evolution data in real time, in situ, and in multiple dimensions without interfering with the testing process, providing much richer process information than traditional endpoint methods, which helps in in-depth analysis of corrosion mechanisms.

[0036] High degree of automation and intelligence: The PLC-based intelligent control system can automatically execute complex multi-step, multi-parameter dynamic test programs, greatly reducing manual operation and intervention. It supports remote monitoring and data management, facilitating laboratory networking and information management, and improving testing efficiency and reliability.

[0037] The equipment boasts high reliability and convenient maintenance: the main structure utilizes corrosion-resistant materials and a double-layer insulation design. Key fluid components, such as the magnetic pump, oil-free air compressor, and multi-stage filters, ensure long-term operational stability and media purity, reducing failure rates and maintenance costs. The inflatable sealing door design enhances sealing performance and ease of use. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the external structure of the test chamber of the present invention;

[0040] Figure 2 This is a schematic diagram of the internal structure of the test chamber of the present invention;

[0041] Figure 3 This is a schematic diagram of the inner structure of the sealing door of the present invention;

[0042] Figure 4 This invention relates to a multi-mode spray tower;

[0043] Figure 5 This is a schematic diagram of the salt solution circulation unit structure of the present invention;

[0044] Figure 6 This is a schematic diagram of the air handling unit structure of the present invention;

[0045] Figure 7 This is a schematic diagram of the rotating sample holder structure of the present invention.

[0046] In the diagram: 1. Test chamber; 2. Observation window; 3. Sealed door; 4. Insulation material layer; 5. Inflatable sealing strip; 6. Ultrasonic atomization unit; 7. Air pressure spray unit; 8. Centrifugal spray unit; 9. Three-way solenoid valve; 10. Spray outlet; 11. PTC ceramic heater; 12. Compressor refrigeration unit; 13. Electrode-type steam humidifier; 14. Rotary dehumidifier; 15. Main storage tank; 16. Concentration sensor; 17. Circulating pump; 18. Multi-stage filter; 19. Air compressor; 20. Air saturator; 21. Mixing device; 22. Rotary spindle; 23. Sample holder; 24. Angle adjustment mechanism; 25. High-definition camera; 26. Corrosion potential sensor; 27. High-precision weighing module; 28. PLC; 29. ​​Data acquisition module; 30. Remote monitoring interface. Detailed Implementation

[0047] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] according to Figures 1 to 7 As shown, a salt spray simulation test chamber includes a double-layered test chamber 1, an observation window 2 on the front of the test chamber 1, and a sealed door 3 on one side. This structure ensures the stability and airtightness of the test environment. An environmental simulation system is installed inside the test chamber 1 to generate and control the test environment, and includes at least a multi-mode spray tower and a temperature and humidity control module. The multi-mode spray tower provides salt spray with different particle sizes and spray patterns, and the temperature and humidity control module enables rapid and precise adjustment of the temperature and humidity inside the chamber. A fluid circulation system is fluidly connected to the environmental simulation system to provide and process the salt solution and air required for the test, and includes at least a salt solution circulation unit and an air handling unit. This system ensures the purity, concentration stability, and controllability of the supplied medium. A sample management system is rotatably installed inside the test chamber 1 to hold and monitor test samples, and includes at least a rotating sample holder and an online monitoring unit. The rotating sample holder ensures more uniform sample exposure, and the online monitoring unit enables real-time tracking of the corrosion process. The intelligent control system is electrically connected to the environmental simulation system, fluid circulation system, and sample management system, and is used to control the testing process and acquire data. This system is the core of the entire equipment's automated and intelligent operation.

[0049] The test chamber 1 comprises an inner layer made of corrosion-resistant polypropylene, an outer layer made of stainless steel, and an insulation material layer 4 filled between the inner and outer layers. This double-layer insulation structure effectively reduces heat exchange with the environment and improves temperature control efficiency and accuracy. The edge of the sealed door 3 is provided with an annular inflatable sealing strip 5, which is connected to a pressure-controllable air source. Compared with traditional mechanical compression sealing, the inflatable sealing method offers better sealing performance, requires less effort to open and close the door, has adjustable sealing pressure, and a longer service life.

[0050] The multi-mode spray tower includes an ultrasonic atomizing unit 6 for generating micron-sized fine salt spray; a pneumatic spraying unit 7 for generating salt spray of conventional particle size; and a centrifugal spraying unit 8 for generating salt spray with controllable direction and intensity. The outlet pipes of the ultrasonic atomizing unit 6, the pneumatic spraying unit 7, and the centrifugal spraying unit 8 are selectively connected to a common spray outlet 10 via a three-way solenoid valve 9. Users can flexibly select or combine different spray modes according to test standards or simulation requirements. The centrifugal spraying unit 8 is particularly suitable for achieving dynamic, directional spraying.

[0051] The temperature and humidity control module includes a PTC ceramic heater 11 installed on the inner wall of the test chamber 1, a compressor refrigeration unit 12 connected to the outside of the test chamber 1, an electrode-type steam humidifier 13, and a rotary dehumidifier 14. PTC heating is safe and efficient, compressor refrigeration can quickly cool down the temperature, and the combination of electrode humidification and rotary dehumidification can achieve wide-range, high-precision humidity control with fast response speed, meeting the needs of rapid switching between dry and wet cycles.

[0052] The salt solution circulation unit includes a main storage tank 15, which houses a concentration sensor 16 for real-time solution concentration monitoring; a magnetically driven circulation pump 17 connected to the outlet of the main storage tank 15; and a multi-stage filter 18 connected to the outlet pipeline of the circulation pump 17. The concentration sensor 16 enables closed-loop control of the solution concentration, automatically replenishing deionized water or salt to maintain a constant concentration. The magnetic pump eliminates the risk of leakage. The multi-stage filter 18 ensures the purity of the sprayed salt mist and prevents nozzle clogging.

[0053] The air handling unit includes an oil-free air compressor 19; an air saturator 20 connected to the outlet of the air compressor 19 for heating compressed air to a predetermined temperature; and a CO2 / SO2 mixing device 21 connected to the outlet of the air saturator 20 for metered injection of corrosive gases into the airflow. Oil-free air avoids oil contamination. The air saturator 20 heats and humidifies the compressed air before it enters the spray tower, meeting standard testing requirements and improving the stability of salt spray deposition. The CO2 / SO2 mixing device 21 allows the equipment to simulate industrial atmospheres or specific polluted environments, expanding the range of testing applications.

[0054] The rotating sample holder includes a vertically positioned rotating spindle 22 driven by a servo motor; multiple sample holders 23 arranged along the axial direction of the rotating spindle 22; and an angle adjustment mechanism 24 connecting the sample holders 23 and the rotating spindle 22. The angle adjustment mechanism 24 allows the sample holders 23 to tilt relative to the horizontal plane within a range of 15° to 90°. The rotational motion ensures that the environmental conditions received by samples at different locations and on different shelves are more consistent. The adjustable angle function allows users to set the sample angle according to testing standards or actual installation conditions.

[0055] The online monitoring unit includes a high-definition camera 25 fixed to the inner wall of the test chamber 1, with its lens pointing towards the rotating sample holder; a corrosion potential sensor 26 mounted on at least one sample holder 23; and a high-precision weighing module 27 integrated below the sample holder 23. The high-definition camera 25 can periodically or continuously capture images of the macroscopic morphological changes of the sample, recording the corrosion initiation and propagation process. The corrosion potential sensor 26 can be used for electrochemical testing to monitor the corrosion tendency of the sample in real time. The high-precision weighing module 27 can monitor changes in sample mass in real time and plot kinetic curves without interrupting the test and removing the sample.

[0056] The intelligent control system includes: an industrial programmable logic controller (PLC) 28 as the core controller; a data acquisition module 29 connected to the PLC 28 for collecting environmental parameters; and a remote monitoring interface 30 supporting remote communication. The PLC 28 is highly reliable, suitable for industrial environments, and highly programmable, capable of accurately executing complex timing logic control. The data acquisition module 29 is responsible for collecting all data, including temperature, humidity, concentration, pressure, and sensor signals. The remote monitoring interface 30 allows users to remotely set programs, monitor test status, and download data via a network, enabling unattended testing.

[0057] This invention also provides a dynamic cyclic testing method, applied to the salt spray simulation test chamber described above, which includes the following steps:

[0058] S1. Preparation Stage: The operator mounts the test sample on the rotating sample holder at a preset angle, closes and inflates the sealing door 3. A salt solution of the predetermined concentration is prepared in the main storage tank 15. Through the human-machine interface of the intelligent control system or a remote client, a predefined test mode is selected, and specific parameters are set.

[0059] S2. Environment Setup Phase: The intelligent control system first activates the temperature and humidity control module to control the PTC heater, compressor cooling, humidifier, or dehumidifier to quickly reach the initially set temperature and humidity inside test chamber 1. Then, according to the selected mode, the corresponding spray unit and air handling unit are activated to ensure that the salt spray concentration and corrosive gas concentration inside the chamber reach and stabilize at the preset values ​​within a predetermined time.

[0060] S3. Dynamic Testing Phase:

[0061] If the cyclic corrosion test mode is selected, the system will automatically execute the following sub-stages according to the preset program until the set total number of cycles is reached:

[0062] Salt spray sub-stage: Activate ultrasonic atomization unit 6 or air pressure spray unit 7 and continue for the first predetermined time to maintain a high humidity and salt spray environment inside the chamber.

[0063] Humidification sub-stage: The spray unit is turned off, and the humidity inside the chamber is maintained or increased to near saturation by the humidifier for a second predetermined time to simulate a condensation humidification environment.

[0064] Drying sub-stage: The heater and rotary dehumidifier 14 are activated to reduce the humidity inside the chamber to a lower level, and the temperature may be appropriately increased, continuing for the third predetermined time. A complete test cycle is 8 hours.

[0065] If the composite environment simulation mode is selected, the intelligent control system will simultaneously and synchronously control the salt spray concentration, corrosive gas concentration, temperature, and humidity to change according to the preset environmental spectrum, simulating real day-night or seasonal environmental fluctuations.

[0066] If the dynamic spraying mode is selected, the rotating sample holder will rotate at a constant speed, and the spray direction and intensity of the centrifugal spray unit 8 will be dynamically adjusted according to the rotation angle of the sample holder. For example, in a simulated crosswind environment, the spray direction will always be at a certain angle to the sample surface, or in a simulated intermittent wave impact.

[0067] Furthermore, in the cyclic corrosion test mode of the dynamic testing phase, the first predetermined time is 2 hours, the second predetermined time is 4 hours, and the third predetermined time is 2 hours, constituting a complete 8-hour test cycle. This cycle is widely applicable to cyclic corrosion testing standards or user-defined cycles in industries such as automotive and electrical electronics.

[0068] In the dynamic spraying mode during the dynamic testing phase, the rotation speed of the rotating sample holder is 0.5 to 5 revolutions per minute. This speed range ensures both uniform sample exposure and prevents droplet sedimentation from being affected by centrifugal force. The spray direction of the centrifugal spray unit 8 is adjusted by a deflection nozzle driven by a stepper motor controlled by the intelligent control system, allowing the spray direction to change periodically or dynamically according to a preset pattern or following the sample position.

[0069] S4. Monitoring and Recording Phase: Throughout the testing process, the intelligent control system continuously records all environmental parameters within the test chamber, including temperature, humidity, salt spray deposition rate, and gas concentration, via the data acquisition module 29. Simultaneously, the online monitoring unit operates: a high-definition camera 25 periodically captures images of the sample; a corrosion potential sensor 26 continuously or intermittently collects potential data; and a weighing module records changes in sample mass. All data is stored synchronously with timestamps.

[0070] S5. End Phase: After the preset test cycle is reached, the intelligent control system automatically stops all environmental simulation equipment and restores the chamber conditions to a safe state. The system automatically organizes all monitoring data and generates a comprehensive test report containing environmental curves, sample image change sequences, mass loss curves, corrosion potential curves, etc., which can be exported or sent remotely.

[0071] 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 variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A salt spray simulation test cabinet, characterized in that, include: The main frame system includes a double-layer test chamber (1), an observation window (2) located on the front of the test chamber (1), and a sealed door (3) located on one side. An environmental simulation system, which is installed inside the test chamber (1), is used to generate and regulate the test environment, and includes at least a multi-mode spray tower and a temperature and humidity control module; A fluid circulation system, which is in fluid communication with the environmental simulation system, is used to provide and process the salt solution and air required for the test, and includes at least one salt solution circulation unit and one air handling unit; A sample management system, which is rotatably installed inside the test chamber (1) for carrying and monitoring test samples, includes at least a rotating sample holder and an online monitoring unit; An intelligent control system, which is electrically connected to the environmental simulation system, fluid circulation system and sample management system, is used to control the testing process and acquire data.

2. The salt spray simulation test cabinet according to claim 1, characterized in that: The test chamber (1) includes: An inner layer made of corrosion-resistant polypropylene, an outer layer made of stainless steel, and a layer of insulating material filled between the inner layer and the outer layer (4); The edge of the sealing door (3) is provided with an annular inflatable sealing strip (5), which is connected to a pressure-controllable air source.

3. The salt spray simulation test cabinet according to claim 1, characterized in that: The multi-mode spray tower includes an ultrasonic atomizing unit (6) for generating micron-sized fine salt spray; a pneumatic spraying unit (7) for generating salt spray of conventional particle size; and a centrifugal spraying unit (8) for generating salt spray with controllable direction and intensity. The outlet pipes of the ultrasonic atomizing unit (6), the pneumatic spraying unit (7), and the centrifugal spraying unit (8) are selectively connected to a common spray outlet (10) via a three-way solenoid valve (9).

4. The salt spray simulation test cabinet according to claim 1, characterized in that: The temperature and humidity control module includes a PTC ceramic heater (11) installed on the inner wall of the test chamber (1), a compressor refrigeration unit (12) connected to the outside of the test chamber (1), an electrode-type steam humidifier (13), and a rotary dehumidifier (14).

5. A salt spray simulation test cabinet according to claim 1, characterized in that: The salt solution circulation unit includes a main storage tank (15) with a concentration sensor (16) inside for real-time detection of solution concentration; a magnetically driven circulation pump (17) connected to the outlet of the main storage tank (15); and a multi-stage filter (18) connected to the outlet pipeline of the circulation pump (17).

6. The salt spray simulation test cabinet according to claim 1, characterized in that: The air handling unit includes an oil-free air compressor (19); an air saturator (20) connected to the outlet of the air compressor (19) for heating compressed air to a predetermined temperature; and a CO2 / SO2 mixing device (21) connected to the outlet of the air saturator (20) for metering the injection of corrosive gas into the airflow.

7. A salt spray simulation test cabinet according to claim 1, characterized in that: The rotating sample holder includes a vertically arranged rotating spindle (22) driven by a servo motor; a multi-layered sample holder (23) arranged along the axial direction of the rotating spindle (22); and an angle adjustment mechanism (24) connected between the sample holder (23) and the rotating spindle (22), the angle adjustment mechanism (24) enabling the sample holder (23) to tilt relative to the horizontal plane in the range of 15° to 90°.

8. A salt spray simulation test cabinet according to claim 1, characterized in that: The online monitoring unit includes a high-definition camera (25) fixed to the inner wall of the test chamber (1), with its lens pointing towards the rotating sample holder; a corrosion potential sensor (26) disposed on at least one sample holder (23); and a high-precision weighing module (27) integrated below the sample holder (23).

9. A salt spray simulation test cabinet according to claim 1, characterized in that: The intelligent control system includes: an industrial programmable logic controller (PLC) (28) as the core controller; a data acquisition module (29) connected to the PLC (28) for collecting environmental parameters; and a remote monitoring interface (30) that supports remote communication.

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