Salt Spray Corrosion Test
Mar 14, 2024| Salt spray corrosion test
Most of the corrosion of metal materials occurs in the atmospheric environment, which contains corrosion components and corrosion factors such as oxygen, humidity, temperature changes and pollutants. Salt spray corrosion is one of the most common and destructive atmospheric corrosion.
Salt spray corrosion of metal materials, mainly conductive salt solution into the metal internal electrochemical reaction, forming a "low potential metal - electrolyte solution a high potential impurity" microbattery system, electron transfer occurs, as the anode metal dissolved, forming a new compound that is corrosive. Chloride ion plays a major role in the process of salt spray corrosion damage, which has a strong penetrating power and easily penetrates the metal oxide layer into the metal interior and destroys the passivity of the metal. At the same time, chloride ions have a small hydration energy, which is easy to be adsorbed on the metal surface, replacing the oxygen in the oxide layer that protects the metal, so that the metal is destroyed.
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