The performance requirements of the salt spray test chamber: the test temperature and the tolerance are 35 degrees plus or minus 2 degrees, the temperature fluctuation is not more than 1 degree, the temperature gradient is not more than 2 degrees, and the salt spray settling rate in the working room is 1.0-2.0ML / H. 80cm2 (1-2 square milliliters per 80 square centimeters per hour).
Product structure and appearance requirements: The materials in direct contact with the salt solution and the salt spray in the salt spray test chamber should not react chemically with the salt solution and the salt spray, and the parts not in direct contact should be resistant to salt spray corrosion, and the salt spray should not be directly sprayed On the test sample, the condensate on the top and inner wall of the box and other components should not drip on the test sample, the pressure inside and outside the box must be balanced, and a pressure balance vent hole should be provided, and the airflow in the work space should not be allowed when venting Through subturbulent turbulence, there should be a sample rack for placing or hanging samples. The sample rack should not cause electrochemical corrosion with the test sample. The salt spray generated by the sprayer should be minutely dispersed, wet, and dense, and the collected liquid after atomization should be removed. Outside the blocking part of the board, it can not be used repeatedly for spraying. The box should be equipped with instruments or devices such as temperature adjustment and indication, and there should be a clear indicator device for the amount of salt mist settling. When atomizing the salt solution with compressed air, the following conditions should be met. :
1. Before the compressed air enters the atomizer, it should completely filter out oil, dust and other impurities;
2. It should be heated to not lower than the working temperature;
3. It should be fully humidified, and the relative humidity of the air at the spray outlet should not be less than 85%;
4. The pressure of compressed air should be adjustable within the range of 70-170KPa, and should be stable.
There should be a salt solution filter in the test chamber, the lid should be reliable, and there should be no leakage of air or salt mist. The appearance of the coating should be smooth and uniform, and there should be no bottom leakage, blistering, layering or scratches.
Safety and environmental protection requirements: the insulation resistance between the terminal and the metal shell of the box should meet: cold state more than 2 ohms, hot state more than 1 ohm, and can withstand 50HZ AC voltage 1500V, pressure time 5S withstand voltage test The protective earth terminal should have a good electrical connection with the enclosure of the test chamber and can be connected conveniently and firmly. It should meet the standard requirements in GB / T 14048.1-2000. There should be over-temperature and over-current protection and alarm devices. The noise of the whole machine should be Not higher than 75DB.
Product performance specification requirements for salt spray test chamber
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