What Is The Salt Spray Corrosion Test?

What is the salt spray corrosion test?
Salt spray corrosion is one of the most common and destructive atmospheric corrosion. The corrosion of salt spray on the surface of metal materials is caused by the electrochemical reaction between the chloride ions and the inner metal through the oxide layer and the protective layer of the metal surface. At the same time, chloride ion contains certain hydration energy, which is easy to be adsorbed in the pores and cracks of the metal surface to squeeze out and replace the oxygen in the oxide layer, and change the insoluble oxide into soluble chloride, so that the passivated surface becomes an active surface.