Corrosion is the destruction or deterioration of materials or their properties caused by the environment. Most corrosion occurs in the atmospheric environment, and the atmosphere contains corrosive components and corrosion factors such as oxygen, humidity, temperature changes, and pollutants. Salt spray corrosion is one of the most common and most destructive atmospheric corrosion.

         The salt fog referred to here refers to the atmosphere of chlorides, and its main corrosive component is the chloride salt in the ocean-sodium chloride, which is mainly derived from the marine and inland saline-alkali regions. The corrosion of the surface of metal materials by salt spray is caused by the contained chloride ions penetrating the oxide layer and protective layer on the metal surface and the electrochemical reaction between the internal metal. At the same time, chloride ions contain a certain amount of hydration energy, which is easily absorbed by the pores and cracks on the metal surface and replaces the oxygen in the chlorinated layer. It turns insoluble oxides into soluble chlorides, making the passive surface active. surface. Causes extremely bad adverse reactions to the product.