There are many methods for salt spray testing. The state has relevant standards and various automobile production. Enterprises also have stricter standards relative to national standards, and the solvent spray used in the salt spray test. The content of etchant is also different, such as 5%, 2.5% using NaCl. 1.25% range. Spray time, moisturizing time, exposure time in the air, Each company also has different requirements, but it can be clear that in the automobile production enterprise Industry, there are strict requirements in this regard.