The salt spray test is an environmental test that uses a salt spray test equipment to simulate the salt spray environment to assess the corrosion resistance of a product or metal material. The salt spray test is divided into two categories, one is the natural environmental exposure test, and the other is the artificial accelerated simulated salt spray environment test.
The artificial simulated salt spray environment test uses a test equipment-salt spray test chamber. Its working principle is to use artificial methods in its volume space to cause salt spray environment to evaluate the salt spray corrosion resistance of the product.
Compared with the natural environment, the artificial control of the salt concentration greatly improves the corrosion rate, greatly shortens the test time and saves the test cost. The artificial simulated salt spray test includes the following items:
Neutral salt spray test (NSS test) is one of the earliest applications in the field of accelerated corrosion test. It uses a 5% aqueous solution of sodium chloride solution, and the PH of the solution is adjusted to a neutral range (6-7) as a solution for spraying. The test temperature is taken at 35 ° C, and the sedimentation rate of the salt spray is required to be between 1 ~ 2 ml / 80 cm 2 · h.
The acetate spray test (ASS test) was developed on the basis of a neutral salt spray test. It is to add some glacial acetic acid to the 5% sodium chloride solution, the pH value of the solution is reduced to about 3, the solution becomes acidic, and the salt mist formed finally changes from neutral salt fog to acid.
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 to strongly induce corrosion.
The alternating salt spray test is a comprehensive salt spray test, which is actually a neutral salt spray test plus a constant damp heat test. It is mainly used in cavity-type machine products.
Through the penetration of the tidal environment, salt spray corrosion is generated not only on the surface of the product but also inside the product.
It is to alternate the product under the salt water and hot and humidity environment conditions, and finally check whether the electrical and mechanical properties of the whole product are changed.
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