There are four kinds of tests that the salt spray test chamber can do: neutral salt spray test (NSS), copper accelerated acetic acid salt spray test (CASS), alternating salt spray test, and acetic acid salt spray test (ASS test). Of course, different tests not only require different solutions, but also the design and structure of the cabinet.
1. The temperature of the neutral salt spray test (NSS) test chamber is required to be (35±2)℃, the humidity is greater than 95%, and the amount of mist reduction is 1～2mL/80cm*h. The nozzle pressure is 78.5～137.3kPa (0.8～1.4) kgf/cm2). In the salt spray test box, the salt water containing (5±0.5)% sodium chloride and the pH value of 6.5 to 7.2 is sprayed through the spray device, and the salt spray is allowed to settle on the test piece to be tested. After a certain period of time Observe the corrosion state of the surface.
2. The copper accelerated acetic acid salt spray test (CASS) is based on the general salt spray test by adding 2 water copper chloride to 5% sodium chloride brine to make the concentration 0.26g/L, and then adjust the pH with acetic acid. Make the pH of the salt mist collection liquid 3.1-3.3. (The test refers to GB/T 10125 artificial atmosphere corrosion test)
3. The alternating salt spray test is a comprehensive salt spray test (realized by an alternating salt spray test box.
4. Acetic acid salt spray test (ASS test) is developed on the basis of neutral salt spray test. It is added some glacial acetic acid in 5% sodium chloride solution.