Salt Spray Corrosion Chamber: A Comprehensive Analysis of Performance, Functions and Applications

Abstract
In the field of industrial product reliability testing, salt spray corrosion testing is a key method for evaluating the corrosion resistance of materials and coatings, and the salt spray corrosion chamber is the core equipment to implement this test. This paper takes the LISUN YWX/Q Series Salt Spray Corrosion Chamber (with the YWX/Q-010 model as the core analysis object) as the research subject. It elaborates on the structural advantages of its integrally formed cabinet made of imported corrosion-resistant PP sheets, deeply analyzes the working principles of the high-precision temperature control system and automatic spray device, systematically introduces the implementation mechanisms of three mainstream test modes (Neutral Salt Spray (NSS), Acetic Acid Salt Spray (AASS), and Copper-Accelerated Acetic Acid Salt Spray (CASS)), and explains the intelligent functions of the equipment. Combined with specific specifications, parameters and practical application scenarios, this paper verifies the important value of this series of salt spray corrosion chambers in ensuring product durability and reliability, providing equipment reference and technical support for relevant testing work in the industrial field.

1. Introduction
In fields such as the marine environment, automotive industry, and electronic appliances, products are exposed to salt-containing humid air for a long time, which makes them prone to salt spray corrosion. This corrosion can lead to the peeling of surface coatings, rusting of metal substrates, and ultimately affect the performance and service life of products. Therefore, during the product research and development, production, and quality inspection stages, evaluating the corrosion resistance of materials and coatings through salt spray corrosion testing has become a key link in ensuring product reliability.

As a special equipment for simulating the salt spray corrosion environment, the salt spray corrosion chamber directly determines the accuracy and reliability of test results through its performance stability, diversity of test modes, and level of intelligence.

LISUN Group, as a professional manufacturer of environmental test equipment, has developed and produced the YWX/Q Series Salt Spray Corrosion Chamber. Relying on its integrally formed cabinet made of imported corrosion-resistant PP sheets, high-precision temperature control system, automatic spray device, and a wealth of intelligent functions, this series of chambers occupies an important position in the industry. This paper focuses on the YWX/Q-010 model salt spray corrosion chamber, and comprehensively analyzes the structural characteristics, working principles, and application value of this series of salt spray corrosion chambers based on the technical parameters and function introductions in the equipment details.

2. Structural Advantages of LISUN YWX/Q Series Salt Spray Corrosion Chamber
The cabinet structure of the salt spray corrosion chamber is the foundation for ensuring the stability of the test environment and the durability of the equipment. The LISUN YWX/Q Series Salt Spray Corrosion Chamber adopts an integral molding process using imported corrosion-resistant PP sheets in its cabinet design, which has significant advantages over traditional welded cabinets.

2.1 Material Properties of Imported Corrosion-Resistant PP Sheets
PP (polypropylene) sheets have excellent chemical corrosion resistance, especially strong resistance to sodium chloride solutions (a commonly used medium in salt spray tests). They can effectively prevent the cabinet from corrosion, aging, or leakage due to long-term contact with salt spray. The imported PP sheets selected by LISUN have undergone special modification treatment, which not only improves the rigidity and toughness of the material but also further enhances its high-temperature resistance. These sheets can adapt to the temperature range of the test chamber (from room temperature to 55°C) and the temperature range of the saturation bucket (from room temperature to 70°C) in salt spray tests, ensuring that the cabinet structure remains stable and not easily deformed in a long-term high-humidity and high-salt environment.

2.2 Leakage Prevention and Structural Stability of the Integral Molding Process
Traditional salt spray corrosion chambers are mostly made by welding and splicing multiple sheets. Welding seams are prone to cracking and leakage due to welding process defects or long-term alternating hot and cold conditions. This leakage can lead to the escape of salt spray, affect the stability of the test environment, and even cause corrosion to surrounding equipment in the laboratory.

The LISUN YWX/Q Series Salt Spray Corrosion Chamber adopts an integral molding process, so there are no welding seams in the cabinet, which fundamentally solves the hidden danger of leakage. At the same time, the integrally formed structure also improves the airtightness of the cabinet, which can effectively maintain the uniformity of the salt spray concentration in the test chamber, avoid interference from external air, and ensure the accuracy of test results. In addition, the design without welding seams also reduces dead corners for cleaning the cabinet, facilitating the cleaning of the interior of the cabinet after the test, reducing maintenance costs, and extending the service life of the equipment.

3. Core Functional Systems of LISUN YWX/Q Series Salt Spray Corrosion Chamber
The core functional systems of the LISUN YWX/Q Series Salt Spray Corrosion Chamber include a high-precision temperature control system and an automatic spray device. These two systems work together to stably simulate different types of salt spray corrosion environments and implement multiple test modes.
3.1 High-Precision Temperature Control System
Salt spray corrosion tests have extremely high requirements for temperature control accuracy. Temperature fluctuations can directly affect the generation amount, deposition rate, and corrosion rate of salt spray, thereby leading to deviations in test results. The temperature control system of the LISUN YWX/Q Series Salt Spray Corrosion Chamber adopts a “dual-zone temperature control” design, which controls the temperature of the test chamber and the saturation bucket respectively, and has excellent temperature uniformity and stability.

3.1.1 Test Chamber Temperature Control
The test chamber is the core area of the salt spray test, and it is necessary to maintain a temperature range from room temperature to 55°C, with a temperature uniformity of ≤2°C and a temperature fluctuation of ≤±0.5°C. The temperature control system collects the real-time temperature of the test chamber through a built-in high-precision platinum resistance temperature sensor, transmits the data to the microprocessor, and then the microprocessor controls the output power of the heating tube to achieve precise temperature adjustment.
At the same time, the equipment is equipped with dual protection devices: mechanical over-temperature protection and electronic over-temperature protection. When the temperature of the test chamber exceeds the set upper limit, the system will immediately cut off the heating power supply and trigger an over-temperature alarm to prevent damage to the test samples or the equipment due to temperature runaway.

3.1.2 Saturation Bucket Temperature Control
The function of the saturation bucket is to heat and humidify the compressed air, so that the compressed air reaches a saturated state before entering the spray system. This avoids condensation during the spray process due to the low temperature of the compressed air, which would affect the salt spray deposition rate. The temperature range of the saturation bucket of the LISUN YWX/Q Series Salt Spray Corrosion Chamber is from room temperature to 70°C. The temperature control system adopts the same high-precision control logic as that of the test chamber to ensure that the compressed air reaches the set temperature before entering the spray device, with a humidity close to 100%. This effectively reduces the crystallization phenomenon at the nozzle and ensures the continuity and stability of the spray.

3.2 Automatic Spray Device
The automatic spray device is a key component for generating salt spray. Its spray method, spray pressure, and salt spray deposition rate directly determine the simulation effect of the salt spray environment. The automatic spray device of the LISUN YWX/Q Series Salt Spray Corrosion Chamber has multiple spray modes and precise parameter adjustment functions.

3.2.1 Spray Method and Pressure Control
The equipment supports three spray methods: continuous spray, intermittent spray, and programmable spray, which can meet the requirements of different standards (such as GB/T2423.17, ASTM-B117) for spray modes. For example, the continuous spray mode is often used in the Neutral Salt Spray Test (NSS); while in the accelerated corrosion test of some specific products, the programmable spray mode can be used to set a “spray-standby” cycle to simulate the intermittent corrosion environment in actual use.

The spray pressure is controlled through a two-stage pressure regulation system. The customer needs to prepare an air source with an inlet pressure of ≥0.4MPa. After the first-stage pressure regulation reduces the pressure to an appropriate range, the second-stage pressure regulation stabilizes the spray pressure at 0.07~0.17MPa (adjustable). Stable spray pressure can ensure uniform particle size of the salt spray and avoid unstable salt spray deposition rate due to pressure fluctuations.

3.2.2 Salt Spray Deposition Rate Control
The salt spray deposition rate is one of the core indicators for measuring the performance of the salt spray corrosion chamber. The national standard requires the salt spray deposition rate to be 1-2ml/80cm²/h (taking the 16-hour test average value). The LISUN YWX/Q Series Salt Spray Corrosion Chamber ensures that the salt spray deposition rate is stably within the standard range by optimizing the nozzle structure (equipped with 1 special nozzle as standard configuration), precisely controlling the spray pressure and the temperature of the saturation bucket.
At the same time, the equipment is equipped with an automatic salt spray deposition monitoring device, which can collect real-time data on the salt spray deposition amount at different positions in the test chamber and display it intuitively on the display screen. This facilitates the operator to monitor the test process, adjust parameters in a timely manner, and ensure the accuracy of the test results.

4. Test Modes of LISUN YWX/Q Series Salt Spray Corrosion Chamber
According to the corrosiveness of the test environment and the requirements for accelerated corrosion, salt spray corrosion tests are divided into three mainstream modes: Neutral Salt Spray (NSS), Acetic Acid Salt Spray (AASS), and Copper-Accelerated Acetic Acid Salt Spray (CASS). The LISUN YWX/Q Series Salt Spray Corrosion Chamber can stably implement these three test modes by adjusting the test medium, temperature, and spray parameters, meeting the test standards and requirements of different industries.

4.1 Neutral Salt Spray Test (NSS)
The Neutral Salt Spray Test is the most basic salt spray corrosion test mode. It simulates the neutral salt spray environment in the marine atmosphere and is suitable for evaluating the corrosion resistance of most metal materials and coatings. The test medium is a 5% sodium chloride solution (pH 6.5-7.2), the temperature of the test chamber is controlled at 35°C, the continuous spray method is adopted, and the salt spray deposition rate is 1-2ml/80cm²/h.

In the Neutral Salt Spray Test, the LISUN YWX/Q Series Salt Spray Corrosion Chamber stabilizes the temperature of the test chamber at 35°C ± 0.5°C through the high-precision temperature control system. The automatic spray device continuously sprays uniform salt spray to ensure that the test environment meets the requirements of national standards such as GB/T2423.17 and GB/T10125. This mode is widely used in the conventional corrosion resistance testing of electronic appliances, hardware accessories, and other products.

4.2 Acetic Acid Salt Spray Test (AASS)
The Acetic Acid Salt Spray Test simulates the salt spray environment containing acidic pollutants in the industrial atmosphere or marine atmosphere. Its corrosiveness is stronger than that of neutral salt spray, and it is suitable for evaluating the acid corrosion resistance of materials and coatings. The test medium is a 5% sodium chloride solution, with acetic acid added to adjust the pH value to 3.1-3.3. The temperature of the test chamber is controlled at 35°C, the continuous spray method is also adopted, and the salt spray deposition rate is maintained at 1-2ml/80cm²/h.

In the Acetic Acid Salt Spray Test of the LISUN YWX/Q Series Salt Spray Corrosion Chamber, the acidic sodium chloride solution is injected into the salt water tank through a special solution preparation device (the user needs to prepare the test medium according to the standard), and then atomized and sprayed by the automatic spray device. The cabinet of the equipment, made of corrosion-resistant PP sheets, can effectively resist the erosion of acidic solutions and avoid cabinet damage; the high-precision temperature control system ensures the stable temperature of the test chamber and guarantees the simulation effect of the acidic salt spray environment. This mode is often used in the testing of automotive parts, outdoor building materials, and other products that are exposed to acidic environments for a long time.

4.3 Copper-Accelerated Acetic Acid Salt Spray Test (CASS)
The Copper-Accelerated Acetic Acid Salt Spray Test is an accelerated corrosion test mode. By adding copper chloride to the acidic sodium chloride solution, the corrosiveness of the salt spray is further enhanced. This test can evaluate the corrosion resistance of materials and coatings in a short time, and is suitable for rapid screening and quality control in the product research and development stage. The test medium is a 5% sodium chloride solution, with acetic acid added to adjust the pH value to 3.1-3.3, and then 0.26g/L copper chloride is added. The temperature of the test chamber is controlled at 50°C, the continuous spray method is used, and the salt spray deposition rate is 1-2ml/80cm²/h.

In the Copper-Accelerated Acetic Acid Salt Spray Test of the LISUN YWX/Q Series Salt Spray Corrosion Chamber, relying on the cabinet made of imported high-temperature-resistant PP sheets and the high-precision temperature control system, the temperature of the test chamber can be stably maintained at 50°C, with a temperature fluctuation of ≤±0.5°C. The automatic spray device can still maintain the uniformity of the spray in a high-temperature environment, ensuring the stability of the accelerated corrosion environment. This mode complies with international standards such as ASTM-B368 and ISO3770, and is widely used in the rapid corrosion resistance testing of electroplated parts, coating materials, and other products.

5. Intelligent Functions and Specifications of LISUN YWX/Q Series Salt Spray Corrosion Chamber
5.1 Intelligent Functions
To improve the convenience of test operation and the controllability of the test process, the LISUN YWX/Q Series Salt Spray Corrosion Chamber is equipped with a wealth of intelligent functions, mainly including the following aspects:

5.1.1 Automatic Monitoring of Salt Spray Deposition Amount
The equipment is equipped with multiple salt spray collectors, which are distributed at different positions in the test chamber. These collectors can collect real-time data on the salt spray deposition amount, calculate the average value through the microprocessor, and display it dynamically on the display screen. The operator can judge whether the salt spray deposition rate meets the standard requirements through the monitored data. If there is a deviation, the spray pressure, the temperature of the saturation bucket, and other parameters can be adjusted in a timely manner to ensure the stability of the test environment.

5.1.2 Timed Control of Test Time
The equipment supports timed control of the test time from 0 to 9999 hours. The operator can set the test duration according to the test standards and requirements. When the test reaches the set time, the equipment will automatically stop the spray and heating, and trigger a prompt sound to inform the completion of the test. The timed control function not only reduces the workload of manual on-site monitoring but also avoids deviations in the test time caused by human operation errors, ensuring the consistency of the test results.

5.1.3 Audible and Visual Alarms for Water Shortage/Over-Temperature
The equipment is equipped with a complete safety protection system, including water shortage alarm and over-temperature alarm functions. When the water level in the salt water tank or the saturation bucket is lower than the set lower limit (water shortage), the system will immediately cut off the power supply of the spray device to avoid damage to the nozzle due to water shortage, and trigger an audible and visual alarm to remind the operator to replenish water in a timely manner.

When the temperature of the test chamber or the saturation bucket exceeds the set upper limit, the dual over-temperature protection devices will cut off the heating power supply and trigger an audible and visual alarm at the same time to prevent damage to the equipment and scrapping of the test samples. In addition, the equipment is also equipped with a low air pressure alarm function. When the air source pressure is lower than 0.4MPa, the system will issue an alarm prompt to ensure the stability of the spray pressure.

5.2 Core Specifications and Parameters
To more intuitively display the performance indicators of the LISUN YWX/Q Series Salt Spray Corrosion Chamber, this paper takes the YWX/Q-010 model as the core and combines the parameters of other models in the series to compile the following table:

LISUN Model	YWX/Q-150	YWX/Q-250	YWX/Q-750	YWX/Q-010	YWX/Q-016	YWX/Q-020
Working room size	600*450*400	900*600*500	1100*750*500	1200*800*500	1600*1000*600	2000*1000*600
External dimensions	1100*670*1050	1410*900*1050	1600*1050*1200	1700*1150*1200	2300*1250*1450	2800*1350*1450
Capacity	108L	270L	412L	480L	960L	1200L
Solution tank volume	15L	25L	30L	32L	40L	45L
Working power	Single -phase AC 220V/50Hz (60Hz available)				Three -phase AC 380V/50Hz (60Hz available)
	1.5KW	2.0KW	2.5KW	2.5KW	5.0KW	6.0KW
Sample space available	500*300*250	800*450*250	900*600*300	1000*600*300	1400*800*350	1800*800*350
Opening Method	Manual control	Manual control	Manual control	Stainless steel air spring support	Cylinder support	Cylinder support
Working temperature	Room temperature ~+55 ℃
The temperature range of saturated barrel	Room temperature ~+70 ° C (Heating and filtering compressed air to reduce nozzle crystallization)
Temperature performance	Temperature uniformity: ≤2 ℃      Temperature volatility: ≤ ± 0.5 ℃
Salt spray deposition rate	1-2ml/80cmm/h (take average of 16-hour test )
Spray method	Continuous, intermittent, programmable test
Test type	Neutral test (NSS), acid test (AASS), copper acceleration salt fog test (CASS)
Safety protection mechanism	Low water level alarm, over-temperature alarm (mechanical over-temperature protection + electronic over-temperature protection dual over-temperature protection), low air pressure alarm
Requirements for air compressors	Prepared by the customer: air inlet pressure 0.4Mp or above, two-stage pressure regulation, spray pressure 0.07~0.17Mp (adjustable)
Sample rack	One set of V -shaped grooves and O -type round sticks (combined with an angle of 20 ° ± 5 °). Special sample racks can be ustomized, and the load-bearing capacity is configured according to actual conditions.
Standard accessories	1 set of V -type/O -type sample racks, 2 bottles of sodium chloride (500g/bottle), 1 plastic rust -proof barrel (5L), 1 nozzle
Working environment requirements	The ambient temperature is 5℃~30℃. Ventilation is recommended. When the temperature exceeds 30℃, it is recommended to adjust the room temperature through appropriate methods. The ambient humidity is below 80%Rh.

It can be seen from the table that the YWX/Q-010 model salt spray corrosion chamber has a test chamber volume of 480L and a sample placement space of 1000600300mm, which is suitable for testing medium-sized test samples. With a power of 2.5KW, it ensures the performance of the equipment while keeping energy consumption relatively low. The cabinet opening method adopts stainless steel gas spring assistance, which is more labor-saving than manual opening and facilitates the loading and unloading of samples and the cleaning of the cabinet.
In addition, other models in the series cover a test chamber volume range from 108L to 1200L, which can meet the testing needs of samples of different sizes and provide users with a variety of choices.

6. Application Scenarios and Industrial Value of LISUN YWX/Q Series Salt Spray Corrosion Chamber
6.1 Application Scenarios
Relying on its stable performance and diverse test modes, the LISUN YWX/Q Series Salt Spray Corrosion Chamber is widely used in multiple industries, mainly including the following fields:

6.1.1 Electronic and Electrical Industry
Electronic and electrical products (such as connectors, circuit boards, sensors, etc.) may be exposed to humid and salt-containing environments during use (such as marine transportation and use in coastal areas). Salt spray corrosion can cause failures such as short circuits and poor contact of products. By conducting Neutral Salt Spray or Acetic Acid Salt Spray tests on electronic and electrical products and their components using the YWX/Q Series Salt Spray Corrosion Chamber, their corrosion resistance can be evaluated, product design and coating processes can be optimized, and the stable operation of products in harsh environments can be ensured.

6.1.2 Automotive Industry
Automotive parts (such as body coatings, chassis components, fasteners, etc.) are exposed to the outdoor environment for a long time and face erosion from rainwater, snowwater, and road salt, which makes them prone to salt spray corrosion. Using the YWX/Q Series Salt Spray Corrosion Chamber to conduct the Copper-Accelerated Acetic Acid Salt Spray Test (CASS) on automotive parts can quickly evaluate the corrosion resistance of the parts, shorten the product research and development cycle, improve the service life and safety of automobiles, and meet the requirements of standards such as ISO 16750-4 (Environmental Conditions and Testing for Electrical and Electronic Equipment of Road Vehicles).

6.1.3 Hardware and Electroplating Industry
The quality of the surface coating of hardware products and electroplated parts directly determines their corrosion resistance. By conducting Neutral Salt Spray or Acetic Acid Salt Spray tests on hardware products and electroplated parts using the YWX/Q Series Salt Spray Corrosion Chamber, the adhesion and corrosion resistance of the coating can be tested, and it can be judged whether the product meets standards such as GB/T1771 (Determination of Resistance of Paints and Varnishes to Neutral Salt Spray) and QB/T3826 (Neutral Salt Spray Test for Metal Coatings of Light Industrial Products). This helps enterprises improve product quality and enhance market competitiveness.

6.2 Industrial Value
The promotion and application of the LISUN YWX/Q Series Salt Spray Corrosion Chamber have brought multiple values to the industrial field:
Firstly, it ensures product quality and reliability. By simulating the real salt spray corrosion environment, defects in the corrosion resistance of products can be found in advance, providing enterprises with improvement directions, reducing the failure rate of products in actual use, and lowering after-sales costs.

Secondly, it promotes the development of industry standardization. This series of salt spray corrosion chambers complies with a number of national and international standards (such as GB/T, IEC, ASTM, ISO), providing enterprises with test equipment that meets the standards, ensuring the authority and comparability of test results, and promoting the unification of product quality standards in the industry.

Finally, it improves research and development efficiency. The application of accelerated corrosion modes such as the Copper-Accelerated Acetic Acid Salt Spray Test (CASS) can obtain data on the corrosion resistance of products in a short time, shorten the product research and development cycle, help enterprises quickly respond to market demands, and enhance core competitiveness.

7. Conclusion
As a key equipment for evaluating the corrosion resistance of materials and coatings, the salt spray corrosion chamber directly affects the accuracy and reliability of test results through its performance and functions. The LISUN YWX/Q Series Salt Spray Corrosion Chamber uses an integrally formed cabinet made of imported corrosion-resistant PP sheets, which solves the leakage problem of traditional cabinets and improves the durability of the equipment. The collaborative work of the high-precision temperature control system and the automatic spray device ensures the stability of the salt spray environment and the diversity of test modes. The rich intelligent functions improve the convenience and safety of test operations.

The LISUN YWX/Q Series Salt Spray Corrosion Chamber, represented by the YWX/Q-010 model, not only meets the requirements of three mainstream test modes (Neutral Salt Spray (NSS), Acetic Acid Salt Spray (AASS), and Copper-Accelerated Acetic Acid Salt Spray (CASS)) but also covers the testing scenarios of samples of different sizes. It is widely used in the electronic and electrical industry, automotive industry, hardware and electroplating industry, and other fields.

Tags：YWX/Q-010