principle:
The salt spray test chamber can do four kinds of tests: neutral salt spray test (NSS), copper accelerated acetic acid salt spray test (CASS), alternating salt spray test, acetic acid salt spray test (ASS test). Of course, different tests not only require different solutions, even the design and structure of the box may also be different.
1, neutral salt spray test (NSS) test chamber temperature requirements at (35±2)℃, humidity greater than 95%, fog reduction volume of 1~2mL/80cm*h nozzle pressure of 78.5~137.3kPa(0.8~1.4kgf/cm2). It is to spray brine containing (5 0.5)% sodium chloride with a pH value of 6.5~7.2 through the spray device in the salt spray test chamber, and let the salt spray settle on the test part to be tested, and observe its surface corrosion state after a certain period of time.
2. Copper accelerated acetic acid salt spray te
st (CASS) is to add 2 water copper chloride into 5% sodium chloride brine on the basis of the general salt spray test, so that its concentration is 0.26g/L, and then adjust the PH with acetic acid, so that the PH value of the salt spray collection solution is 3.1-3.3. (Test reference GB/T 10125 artificial atmosphere corrosion test)
3, alternating salt spray test is a comprehensive salt spray test (using alternating salt spray test chamber to achieve.
4. Acetic acid spray test (ASS test) is developed on the basis of neutral salt spray test. It's a 5% sodium chloride solution with some glacial acetic acid.
Matters needing attention:
1, regular cleaning and maintenance of salt spray test tank pressure barrel, salt tank, nozzle.
2, sodium chloride solution do not manually add water from the pressure barrel into the pour, the first to clean the solution measuring cylinder and then add distilled water.
3, do not plug the back exhaust pipe during the test, so as not to make the box deformation due to too much pressure in the box.
4, flammable and explosive goods do not put into the box.
5. The pressure gauge behind the salt spray test box is 2kg, and the front is 1kg. It has been designed by Wuhan Still Test Equipment Co., Ltd. before leaving the factory.
6. If the spray quantity is insufficient, please adjust the spray tower higher; if the spray quantity is too large, lower the spray tower (the standard for collecting spray quantity is 1~2ml/h, and take the 16-hour average value).