The intelligent salt spray test chamber is an environmental test that mainly uses the salt spray test chamber to create artificial simulated salt spray environmental conditions to evaluate the corrosion resistance of products or metal materials. It is divided into two categories, one is the natural environmental exposure test. The other type is artificial accelerated simulated salt spray environment test. The artificial simulated salt spray environment test uses a test equipment with a certain volume space - salt spray test chamber, artificially in its volume space, causing salt spray environment. To assess the salt spray corrosion resistance quality of the product. Compared with the natural environment, the salt concentration of sodium chloride in the salt spray environment can be several times or several times higher than the salt spray content of the general natural environment, causing corrosion. The speed is greatly improved, and the salt spray test is carried out on the product, and the time for obtaining the result is also greatly shortened. If a product sample is tested in a natural exposed environment, it may take one year to corrode, and in the artificial simulated salt spray environment. Test, as long as 24 hours, you can get similar results.
The salt spray test using the smart salt spray test chamber includes neutral salt spray test, acetate spray test, copper salt accelerated acetate spray test, alternating salt spray test.
1. Neutral salt spray test (NSS test) is the most widely used accelerated corrosion test method in the earliest application field. It uses 5% aqueous solution of sodium chloride solution, and the pH value of the solution is adjusted in the neutral range (6-7). As a solution for spraying. The test temperature is taken at 35 ° C, and the sedimentation rate of salt spray is required to be between 1 and 2 ml / 80 cm 2 · h.
2. Acetic acid intelligent salt spray test chamber (ASS test) is developed on the basis of neutral salt spray test. It is to add some glacial acetic acid in 5% sodium chloride solution to reduce the pH value of the solution to about 3 The solution becomes acidic, and the resulting salt spray is also changed from neutral salt spray to acidity. Its corrosion rate is about 3 times faster than the NSS test.
3. Copper salt accelerated acetate spray test (CASS test) is a rapid salt spray corrosion test developed recently in foreign countries. The test temperature is 50 ° C. A small amount of copper salt---copper chloride is added to the salt solution, which is strongly induced. Corrosion. Its corrosion rate is about 8 times that of the NSS test.
4. The intelligent salt spray test chamber is a comprehensive salt spray test, which is actually a neutral salt spray test plus a constant damp heat test. It is mainly used for cavity type machine products, which makes the salt through the penetration of the tidal environment. The fog corrosion is not only produced on the surface of the product, but also generated inside the product. It is to alternate the product under the salt water and hot and humid environment conditions, and finally check whether the electrical properties and mechanical properties of the whole product are changed.
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