Large walk-in salt spray chamber, salt spray corrosion chamber.

Salt spray corrosion test laboratory

It can simulate typical environmental conditions in nature at any time without being limited by time and season. Putting the product into an environmental simulation laboratory for environmental simulation testing, replacing the usage environment with a simulated environment, can save a lot of manpower and material resources, and save development costs. At the same time, environmental simulation testing is based on the product's usage environment conditions, controlling the product's usage conditions. The testing has an "acceleration" property, which can shorten the product's testing cycle.
1. Design basis and guiding ideology
1.1 Based on the technical conditions, sample form, sample material, sample size, weight of heavy components, and other relevant technical requirements in the user's bidding document.
1.2 Design according to the standards corresponding to the required equipment.
1.3 The structural design of the test chamber is reasonable, and the supporting products and functional components can meet the production needs of stability, safety, and reliability. It can meet user detection requirements, and is easy to use, operate, and maintain. It has a long service life, beautiful appearance, and a good user interface, making user operation and monitoring simpler and more intuitive.
1.4 The main components of the equipment shall be selected from the manufacturer's high-quality products for stability and normal service life.
1.5 Adopt mature and reliable new technologies and processes to reduce energy consumption, save costs, and improve quality.
1.6 Electrical control production and installation shall comply with relevant electrical installation standards, operate reliably, and pay attention to electrical protection and interlocking functions.
2. Form and scope of project undertaking
2.1 The design, production, procurement of components, installation, and commissioning work undertaken by the project shall be the responsibility of the contractor (supplier).
2.2 The common systems of the equipment (power supply, water source, etc.) are connected by the user to the designated location of the supplier, and the fire protection, lighting, ventilation, etc. of the workshop are also the responsibility of the user.
2.3 The civil foundation of the equipment shall be made by the user according to the requirements of the supplier.
3 Design Execution Standards
3.1 GB/T10587-2006 Technical Conditions for Salt Spray Test Chamber
3.2GJB150.11A-2009 Military Equipment Laboratory Environmental Test Methods Part 11: Salt Spray Test
3.3 GB/T2423.17-2008 Basic Environmental Testing Procedures for Electrical and Electronic Products - Test Ka: Salt Spray Test Method
3.4 GB/T10125-1997 Artificial Atmosphere Corrosion Test Salt Spray Test
4. Acceptance criteria:
GB/T5170.8-2008 Basic parameter calibration methods for environmental testing equipment for electrical and electronic products Salt spray testing equipment

Main parameter indicators of the equipment
1. Equipment model: AB-200
2. Studio size: 2000 mm x 3000 mm x 2000 mm (length x depth x height) (excluding spire)
Outer box size: 3500 * 2400 * 2850mm
3. Door: Double door, 2000mm × 1600mm, double leaf (PP board door, with double-layer silicone rubber seal and door lock).

4. Temperature range: 35 ℃ -50 ℃
5. Temperature fluctuation: ± 0.5 ℃ (when unloaded)
6. Temperature deviation: ± 2 ℃ (when unloaded)
7. Temperature gradient: ≤ 2 ℃
8. Salt spray settling amount: 1-5 ml/h/80cm2 adjustable
9. Salt water concentration: adjustable from 0.5% to 5%
10. Test time: 0-999 H, M, S; How to translate
11. Observation window: 350 × 500mm (length × height)
12. spray mode: air flow spray, continuous/intermittent.
13. Bottom load-bearing capacity: ≥ 0.5T
15. Average * working hours:>2000h
16. Average lifespan:>10 years
17. Noise: ≤ 75dB
18. Rated voltage of the laboratory: AC (380 ± 38) V 50Hz ± 0.5Hz
2、 Working principle:
1. Working principle diagram (see attached diagram)
3、 Composition of Salt Spray Laboratory:
1. Laboratory body
2. Gas supply system
3. Saltwater supply system
4. spray system
5. Drainage, sewage, pressure balance system:
6. Rapid defogging device
7. Electrical control system
8. Water treatment system

1. Laboratory body
1.1 It is composed of PP board welding, which directly forms a sealed test space. The box can automatically maintain insulation within the specified temperature range, while meeting the requirements for the layout of the fogging device, gas path, saltwater supply pipeline, and temperature sensor opening placement. Due to the high temperature (35-50 ℃) and strong corrosiveness during salt spray testing, the material used to manufacture the salt spray test box body should have certain anti-corrosion and temperature resistance properties. At present, most of the box materials are made of plastic, fiberglass, and stainless steel. Fiberglass and PVC have good corrosion resistance, and special stainless steel materials should also be selected for stainless steel. General stainless steel is also not salt resistant. In order to meet the requirements of corrosion resistance, easy cleaning, temperature resistance, and certain strength, the internal bile material of this chamber is made of 12mm PP board; The outer wall material is PP board, and the middle is reinforced with square steel.
The material combination of the outer wall and the inner liner is as follows:
8mm thick PP board on the outside and 12mm thick PP board on the inside
1.2 The salt spray test stipulates that the water droplets formed by spray shall not fall on the test piece, and the included angle on the top of the test room shall be a certain angle, generally 110 º. Thus, the formed droplets flow along the apex to both sides of the laboratory.
1.3 Gate: It is one of the key components of the room. It can meet the requirements of convenient entry and exit of sample vehicles, good insulation, no cold running or condensation around, and lightweight switches. The fourth is good sealing and no salt spray leakage.
1.4 Floor: A 12mm thick PP board reinforced channel steel bottom plate is used to ensure the overall compressive strength and wear resistance of the bottom surface. The floor is inclined from the outside to the inside towards the collection tank at a certain angle to facilitate the quick discharge of atomized water.
2. Gas supply system

2.1 The laboratory adopts air flow spray, so there should be a gas supply system. The function of the gas supply system is to continuously supply fresh, clean, and humid hot air with pressure required for the salt spray test chamber. Our laboratory uses a domestically produced piston compressor as the gas supply source. The ambient atmosphere is compressed into high-pressure air by the air compressor and then enters the gas storage tank, which is connected to the location through the gas pipeline.
2.2 In order to ensure that the air entering the nozzle is clean and humid hot air, the gas generated by the air compressor needs to be separated into oil and water. The oil-water separation filter adopts a three-stage filtration method of pre filtration, fine filtration, and oil removal filtration. The filter element made of polymer compound material effectively removes oil, water, and particles from the compressed air. Place it in the position before entering the saturator, striving to achieve maximum ability to remove oil stains.

parameter

Model Processing Capacity m3/min Rated
High working pressure (MPa)
Working pressure MPa Particle size
Um residual oil quantity
Mg/m3 interface size and weight
K g

LJ33-2F 2．0 0．8 1．0 ≤5 ≤1 G3/4 30
The filter element of the high-efficiency precision filter can meet various requirements such as oil removal, water removal, dust removal, and sterilization. The technical parameters of the filter element are as follows:

Filter level particle size (um) dust removal efficiency% outlet residual oil content (ppm) initial pressure difference MPa service life h
Pre filtration V 3 100 0.003 ≥ 4000
Fine filtration Z 0.3 99.97 0.1 (0.8) 0.005 ≥ 4000
Oil removal filtration A 99.9999 0.003 (0.0024) 0.010 ≥ 4000

2.3 Since the spray pressure only needs 0.07~0.14Mpa, the filtered air needs to be reduced to 0.2~0.3 MPa by level *, and 0.07~0.14MPa by level 2 according to the amount of fog, so that the spray pressure sprayed through the nozzle is within the specified range.
2.4 Salt spray test stipulates that the air entering the laboratory must have a certain temperature and humidity. Therefore, a heating and humidification device, namely an air saturator, is added before the compressed air enters the chamber. The temperature value of the saturator is controlled by the main control board, and the spray pressure and temperature are adjusted according to different ambient temperatures and test temperatures. The saturator is a pressure vessel with a pressure resistance of ≥ 6Kg, made of stainless steel, and filled with deionized water heated by an electric heating tube. Equipped with water level gauge, inlet valve, exhaust valve, drain valve, sensor testing hole, etc. One end of the three-way connector is connected to the pipeline leading to the nozzle, and the other end is connected to a pressure gauge. Compressed air enters the saturator and is then passed through ionized water or distilled water for further filtration. Then mix it with the water vapor generated by deionized water or distilled water inside the cylinder, so that the air entering the nozzle is close to the test temperature inside the box, clean and humid.
The pipeline material of the gas supply system is pressure resistant PU pipe. All pipes exposed to the air and pipes buried in the outer framework need to be insulated with different insulation materials.
2.5 Replenishment of water in the saturator: since the air flowing out of the saturator is hot and humid air, it will take away part of the water vapor, and will continue to consume water for a long time, so it is necessary to make up water regularly. In addition, since there is pressure in the saturator under the spray state, and water cannot enter, the air supply must be temporarily stopped, and the water inflow is also very slow. In this case, it is necessary to set two solenoid valves on the saturator. One of them is the inlet solenoid valve, and the other is the outlet (ventilation) solenoid valve. When water enters, both solenoid valves open simultaneously. You can also manually add water.
3. Saltwater supply system:
3.1 Airflow spray shall be carried out continuously, and the continuous automatic supply of brine is *. The brine supply system is set up to achieve this purpose. The brine tank is usually placed on the upper part of the room. If proper control is not carried out, either the brine will flow out quickly or the demand for spray will not be met.
3.2 In order to maintain a certain siphon height, it is necessary to keep the saltwater siphon level within the range of 200-500mm. The pre configured salt solution is stored in a plastic container and pumped into the salt water supply container by a magnetic pump. The salt water supply container is arranged on the outer frame and is controlled by an automatic liquid level controller to operate the magnetic pump. Keep the upper and lower limits of the water level within 10mm.
4. spray system:

4.1 The function of the spray device is to use the high-pressure air supplied by the air supply system to inject the brine from the nozzle at a high speed. The brine is sucked up by the siphon principle and mixed with the air to produce a misty mist. Because the fog contains some unmeasured water droplets, the sprayed misty air flow cannot be directly introduced into the test chamber, but should be hit on a salt spray baffle first to break the unmeasured water droplets into fog or block the redundant salt spray back, so that the sprayed fog is really a fine fog without water droplets. The magnitude of salt spray deposition is directly related to the pressure of saltwater supply and gas supply, as well as the angle of the baffle.
4.2 The refracting baffle is placed in front of the salt spray nozzle. Unlike the reflective baffle, it faces the test space. It uses the lifting angle of the baffle to lift the physical airflow to the top of the salt spray test chamber and then settle freely (industry name: baffle spray). This laboratory adopts a Japanese non crystalline nozzle structure with baffle atomization. Based on our experience, a portion of the atomized baffle will not atomize and will flow down, resulting in a waste of saltwater resources. Therefore, a collection device can be added to collect the flowing saltwater, thereby maximizing the utilization of saltwater resources. This room requires approximately 3 pairs of nozzles. The nozzle is made of resin glass and equipped with a runoff regulation system. They are installed on a bracket and can move vertically within a range of 200mm, and can rotate up, down, left, and right at an angle of ± 90 °, continuously adjustable.

5. Drainage, sewage, pressure balance system:
5.1 In the process of spray, most of the salt solution falls into the chamber except for a part taken away by the mist exhaust system. The drainage pipe and fog pipe can be organically combined to discharge both salt spray and accumulated water through a channel, while maintaining pressure balance. The final fog outlet should be far away from the laboratory. If it is necessary to treat the discharged salt spray, an air purification tower can be used for treatment.
6. Rapid defogging device:
After the experiment, there is still a large amount of salt spray in the chamber, which cannot be completely settled or discharged outside in a short period of time. In order to facilitate the early entry of experimental personnel into the chamber, our laboratory is designed with a set of rapid mist exhaust devices with pressure balance windows. The indoor salt spray can be eliminated within about 5 minutes.

7. Electrical control system
7.1 Laboratory Control System
The human-machine interface of this control system adopts Advantech embedded touch screen, and the main controller adopts Siemens programmable controller. The control system is specially customized by our company for customers to meet different testing modes. The system control is precise, smooth, and does not drift. The control interface adopts a bilingual operation interface in Chinese and English, with detailed experimental parameters and simple and fast settings. The experimental information is complete and has detailed alarm indication functions.
8. Water treatment system
This deionized water generator is composed of a cation anion exchanger and reverse osmosis. Ion exchange is a technology for removing ionic substances from water. The ion exchange method can be used to produce soft water, pure water, and ultrapure water. According to the actual situation of the user, a single-stage and multi-stage multi-stage design is adopted. The combination of reverse osmosis and ion exchange equipment can greatly extend the regeneration cycle of resin, not only improving the purity of water, but also making it easier to produce 1M Ω～ 18 M Ω· cm high-purity water to meet the needs of different users. The purified water obtained by using an ion exchanger is more cost-effective and efficient than water obtained by distillation.

4、 Security protection system
1. Overtemperature protection
2. Overpressure protection
3. Heating tube malfunction alarm
4. Water shortage alarm
5. Power failure alarm
6. Display of closed door status