There are four kinds of tests that can be done in the salt spray corrosion test box: neutral salt spray test (NSS), copper accelerated acetate salt spray test (CASS), alternating salt spray test, and acetate salt spray test (ASS test). Of course, different tests not only require different solutions, but even the design and structure of the cabinet may be different.
1. The temperature of the neutral salt spray test (NSS) test chamber is required to be (35 ± 2) ° C, the humidity is greater than 95%, the amount of mist reduction is 1 to 2 mL / (h · cm2), and the nozzle pressure is 78.5 to 137.3 kPa ( 0.8 ～ 1.4kgf / cm2). In the salt spray test chamber, the salt water containing (5 ± 0.5)% sodium chloride, pH value 6.5 ~ 7.2 is sprayed through the spray device to allow the salt spray to settle on the test piece to be tested, after a certain time Observe the surface corrosion state.
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 adjusting the pH with acetic acid. Make the PH value of the salt spray collection liquid 3.1-3.3. (Test reference GB / T 10125 artificial atmosphere corrosion test)
3. The alternating salt spray test is a comprehensive salt spray test (implemented by an alternating salt spray test box). It is actually a neutral salt spray test plus a constant damp heat test. It is mainly used for hollow machine products. Through the penetration of the tidal environment, the salt spray corrosion not only occurs on the surface of the product, but also occurs inside the product. It converts the product alternately under the two environmental conditions of salt spray and humid heat, and finally assesses whether the electrical and mechanical properties of the whole product have changed.
4. Acetic acid salt spray test (ASS test) is developed on the basis of neutral salt spray test. It is to add some glacial acetic acid to the 5% sodium chloride solution, so that the pH value of the solution is reduced to about 3, the solution becomes acidic, and the salt mist formed finally becomes acidic from the neutral salt mist. Its corrosion rate is about 3 times faster than the NSS test.
The above are the principles of the four salt spray test chambers of the salt spray test chamber. Customers can choose different salt spray chambers according to their own test needs.
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