Salt spray test is the more common and most destructive atmospheric corrosion, salt spray test is a kind of natural environment test that mainly uses the environment created by salt spray test equipment to simulate the natural environment of salt spray to assess the corrosion resistance of finished products or metal materials. The purpose of salt spray testing is to assess the quality level of salt spray corrosion resistance of finished products or metal materials, and the salt spray test data is the judgment of product quality, and whether its judgment data is correct and reasonable is the key to correctly estimating the quality level of finished products or metal salt spray corrosion.