Salt spray corrosion test

Corrosion is the damage or deterioration of materials or their properties under the action of environment. Most of the corrosion occurs in the atmospheric environment, which contains oxygen, humidity, temperature changes, pollutants and other corrosion components and corrosion factors. Salt spray corrosion is one of the most common and destructive atmospheric corrosion. The salt fog here refers to the atmosphere of chloride, and its main corrosive component is the chloride salt in the ocean - sodium chloride, which mainly comes from the ocean and inland salt and alkali areas. The corrosion of the metal surface by salt spray is caused by the electrochemical reaction between the chloride ion and the inner metal through the oxide layer and the protective layer on the metal surface. At the same time, chloride ions contain a certain amount of hydration energy, which is easy to be adsorbed on the pores and cracks of the metal surface and displace the oxygen in the oxide layer, turning the insoluble oxide into soluble chloride, making the passivated surface become active surface. Cause extremely bad adverse reactions to the product.