The salt spray test chamber uses salt spray corrosion to detect the corrosion resistance of the tested samples. The salt spray is a dispersion system consisting of tiny droplets of salt in the atmosphere. It is a series of artificial environment three-proof series. One type, many enterprise products need to simulate the damage caused by the surrounding climate of the ocean, so the salt spray test box should be shipped. The salt spray test is divided into two types: neutral salt spray and acid salt spray. The difference is that the standard is different from the test method. It is called "NSS" and "CASS" test respectively. It is the most common test in artificial three weather protection. method.
standard requirement
GB/T2423.17-2008 salt spray test method
GB/T 2423.18-2000 "Basic Procedures for Electrical and Electronic Products Test Ka"
GB/T10125-1997 artificial atmosphere corrosion test_salt spray test
Technical conditions of GB/T10587-2006 salt spray test chamber
GB10593.2-1990 Method for measuring environmental parameters of electrical and electronic products
GB/T1765-1979 Determination of moisture resistance, salt spray resistance, weather resistance (manual acceleration) paint film test
GB/T1771-2007 Determination of resistance to neutral salt spray of paints and varnishes
GB/T12967.3-2008 Aluminium and aluminium alloys - Determination of anodic oxide film - Part 3
GB/T5170.8-2008 and equivalent IEC, MIL, DIN, ASTM and other related standards
experiment method
Can be tested:
Neutral salt spray test (NSS test) salt spray test (SS test)
Acetate spray test (ASS test)
Copper accelerated vinegar instinct test
High temperature damp heat test
Test temperature: neutral salt spray test: laboratory: 35 ° C ± 1 ° C, b. saturated air barrel: 47 ° C ± 1 ° C, acid corrosion test: laboratory: 50 ° C ± 1 ° C, b. saturated air barrel: 63 °C±1°C, can also be set according to JIS, CNS, etc.
monitor
1. Adopting Japan imported "U-Control" brand control instrument, 7-inch high-definition true color LCD touch screen display
2. Real-time monitoring (monitor controller real-time data, signal point status, actual output status)
3. Curve recording function 3.3.1. The controller can store historical data within 600 days (in the 24-hour running state, the recording interval is more than 1min, the control data is recorded at the same time), and the historical data curve of the uploaded control can be played back.
4. In the machine stop state, you can insert the U disk to export or upload data at any time, and the exported file can be viewed or converted to EXCEL format by computer with random gift software.
5. The instrument is equipped with a USB port, which can directly preview and print the micro printer through the port (optional)
6. Control uses the same channel coordination control of PID + SSR system
7. With automatic calculation function, the temperature and humidity change conditions can be corrected immediately, making the control more precise and stable.
Box structure
The overall molding is welded by high temperature, corrosion-resistant, easy to clean, and no leakage.
The tower spray system is equipped with a salt liquid filtration system. There is no crystal nozzle, the salt spray is evenly distributed, and the sedimentation amount is freely adjusted.
The cover is made of transparent material to clearly see the test items and spray conditions inside the box.
A water-tight structure is adopted between the lid and the box, and no salt mist overflows.
The line control board and other components are fixed at the position for easy inspection and maintenance. The door lock is used to open the door, which is not only beautiful but also convenient for maintenance.
Internal structure
1. Spray device: tower sprayer with built-in glass nozzle. The spray is guided by the tower tube and then dispersed by cone. After being evenly dispersed, it is diffused into the whole test chamber;
2, the amount of spray adjustment: increase the spray volume of the cone disperser on the spray tower, and decrease the spray volume when lowered;
3. Collector: The fine mist sprayed from the nozzle is settled in a free fall manner. One or several funnel cups with a surface area of ​​80 cm2 are built in to collect salt spray, which is condensed into water and then flows from the conduit to the metering cylinder outside the tank;
4. Heating the water tank: the water tank is attached to the bottom of the test chamber, and is used for water heating and keeping the temperature of the test chamber stable;
5. Shelf: Made of plastic steel, the single load does not exceed 2kg. If it is dispersed, it can bear the weight within 10kg. There are two rows of round holes on both sides of the rack. The storage bar is placed at a vertical angle of 15 degrees and 30 degrees. use.
External structure
1. Test box cover: roof type angled 110 degree perspective cover, which can clearly observe the indoor test condition;
Salt spray test box physical picture
Salt spray test box physical picture
2, isolated sink: use water to seal the lid to avoid salt leakage;
3. Metering cylinder: collect the spray volume of each test, each time 50ml is the highest scale;
4. Saturated air tank: placed at the bottom of the control box, made of SUS#304 stainless steel plate, which plays the role of filtration, heating and humidification, so that the purified air reaches the saturation temperature and humidity and then sprays to the nozzle. The saturator has automatic water supply. Features;
5. Pressure regulating valve: Manually adjust the intake pressure and spray pressure. The intake pressure is controlled at 0.3 mPa; the spray pressure is controlled at 0.07-0.17 mPa. (The above pressure has been adjusted before leaving the factory, under normal circumstances, users do not need to adjust)
6. Pressure gauge: The pressure displayed by the gauge pointer is the pressure when the air-saturated air bucket conveys the nozzle spray;
7, water tank: automatic or manual replenishment of saturated water;
8. Exhaust pipe: PVC hard plastic pipe with a diameter of 50. When the salt spray test chamber is working, the pressure caused by the spray is oozing out, and the excess water in the tank overflows.
Equipment material
The salt spray corrosion test box material is generally selected from PVC and PP.
When used as a neutral salt spray test (NSS test) and a salt spray test (SS test), PVC is used to reinforce hard plastic plates.
The PP plate was used as the acetate spray test (ASS test) and the copper accelerated vinegar instinct test (CASS test).
PP board is more resistant to high temperature and strong corrosion than PVC board.
Control System
High-precision PID temperature controller with an error of ±0.1 °C, Fuji, RKC, Honeywell watch (optional).
Continuous or periodic spray optional.
All circuits are equipped with circuit breakers, all with electronic and mechanical overheat protection.
Multiple system protection, safe and reliable. GB/T2423.17-2008 Environmental testing of electric and electronic products - Part 2: Test method test Ka: salt spray
GB10587-89 salt spray test chamber technical conditions
Natural environment
The artificial acceleration simulation salt spray environment test uses a test equipment with a certain volume space--salt spray test chamber to artificially in the volume space to cause the salt spray environment to aging the salt spray corrosion resistance quality of the product. . Compared with the natural environment, the salt concentration of the chloride in the salt spray environment is several times or several times that of the salt spray content of the general natural environment, so that the corrosion rate is greatly improved, and the salt spray test is performed on the product, and the time for obtaining the result is also greatly increased. shorten.
The product meets the requirements of: CNS, ASTM, JIS, ISO standard salt spray test. The surface of various materials is tested for corrosion resistance after coating, electroplating, anodizing, anti-rust oil and other anti-corrosion treatment.
Imported intelligent temperature control instrument is adopted. The instrument has high intelligence, multiple sets of PID calculation and fuzzy control, and fast tuning to achieve smoother control output and higher control accuracy.
With the automatic timing device, after the test laboratory reaches the predetermined temperature, automatic spray is performed, and the time until the timer is set is automatically stopped.
The laboratory can also use a transparent top cover to monitor the spray status and sample working conditions at any time.
The nozzle adopts a non-crystallized spray nozzle, and there is no salt blockage.
There are dual pressure adjustment and over temperature protection devices.
Structural features
1. Both inner and outer biliary are molded by epoxy glass reinforced plastic. It has the characteristics of light weight, corrosion resistance, high strength, no leakage, smooth surface, smooth and easy to clean.
2, the water seal in the form of salt spray will not spill, duct heating jacket, working chamber fast heating, uniform temperature distribution.
3, designed to salt spray tank cap 110 ~ 112 ℃ apex angle, without the cold box of condensing water dripping directly on the sample.
4, the spray method is a spray tower, a spray tower is placed in the middle of the bottom surface of the chamber. The material of the nozzle is made of quartz glass, the mist is fine, and the salt spray is evenly distributed.
5, the control system of the device is placed in the upper right of the box, user-friendly operation, a power switch, the discharge switch mist spray switch panel, two self-tuning PID digital instrumentation, and equipment and operation time interval timers The spray timer also has an over-temperature protector on the circuit board of the cabinet.
Test principle
There are four types of tests that can be done in the salt spray test chamber: neutral salt spray test (NSS), copper accelerated acetate spray test (CASS), alternating salt spray test, and acetate spray test (ASS test). Of course, different tests are not only the same solution required for the test, but the design and structure of the case may be different.
1. The temperature requirement of the neutral salt spray test (NSS) test chamber is (35±2) °C, the humidity is greater than 95%, the fog reduction is 1~2mL/80cm*h, and the nozzle pressure is 78.5~137.3kPa (0.8~1.4). Kgf/cm2). In a salt spray test chamber, a salt water containing (5 ± 0.5)% sodium chloride and a pH of 6.5 to 7.2 is sprayed through a spray device to allow the salt spray to settle onto the test piece to be tested, and after a certain period of time, observe it. Surface corrosion state.
2. Copper accelerated acetate spray test (CASS) is to add 2 water copper chloride to 5% sodium chloride brine based on the general salt spray test to make the concentration 0.26 g / L, and then adjust the pH with acetic acid. The pH of the salt spray collection is from 3.1 to 3.3. (Reference Test GB / T 10125 artificial atmosphere corrosion test)
Third, the alternating salt spray test is a comprehensive salt spray test (implemented by alternating salt spray test chamber).
4. The acetate spray test (ASS test) was developed on the basis of a neutral salt spray test. It is to add some glacial acetic acid to a 5% sodium chloride solution.
Precautions
1. Regularly clean and maintain the pressure tank, salt water tank and nozzle of the salt spray test chamber.
2, sodium chloride solution, do not manually pour water from the pressure tank, first adjust the solution cylinder and then add distilled water.
3. Do not block the rear exhaust pipe during the test, so as to prevent the box from deforming due to excessive pressure inside the box.
4. Do not put flammable or explosive materials into the box.
5. The pressure gauge behind the salt spray test chamber is 2 kg, and the front is 1 kg. Before the factory, Wuhan Shang Test Equipment Co., Ltd. has been designed, do not move.
6. If the amount of spray is insufficient, please raise the spray tower, and spray the spray to oversize the spray tower. (The standard for collecting spray is 1~2ml/h, take the 16-hour average)
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