Salt spray test is a common and destructive atmospheric corrosion Salt spray test is an environmental test that mainly uses the artificial simulated salt spray environment conditions created by the salt spray test equipment to evaluate the corrosion resistance of products or metal materials. It is divided into two categories, one is natural environment exposure test, the other is artificial accelerated simulated salt spray environment test. The artificial simulated salt spray environment test is to use a test equipment with a certain volume space - salt spray test chamber, and use artificial methods to create a salt spray environment in its volume space to assess the quality of salt spray corrosion resistance of products. Compared with the natural environment, the salt concentration of chloride in the salt fog environment can be several times or several tens of times of the salt fog content in the general natural environment, which greatly improves the corrosion rate and greatly shortens the time for obtaining the results of salt fog test on products.