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Corrosion of salt spray and test

2020-07-20

1. Corrosion of salt spray

Corrosion is the destruction or deterioration of materials or their properties caused by the environment. Most of the corrosion occurs in the atmospheric environment. The atmosphere contains corrosive components and factors such as oxygen, humidity, temperature changes, and pollutants. Salt spray corrosion is a common and most destructive atmospheric corrosion. The salt fog mentioned here refers to the atmosphere of chloride. Its main corrosion component is the chloride salt in the ocean-sodium chloride, which mainly comes from the ocean and the inland saline area. The corrosion of the metal material surface caused by salt spray is caused by the electrochemical reaction of the contained chloride ions through the oxide layer and the protective layer on the metal surface and the internal metal. At the same time, the chloride ion contains a certain hydration energy, which is easily dissipated by the pores and cracks adsorbed on the metal surface and replaces the oxygen in the chloride layer, turning the insoluble oxide into soluble chloride, making the passive surface active surface. Causes a bad reaction to the product.
2. The salt spray test and its relationship with the actual
Salt spray test is an environmental test that mainly uses artificially simulated salt spray environmental conditions created by salt spray test equipment to evaluate the corrosion resistance of products or metal materials. It is divided into two categories, one is the natural environment exposure test, and the other is the artificial accelerated simulated salt spray environment test. The artificial simulated salt spray environment test is to use a salt volume test box with a certain volume of space to test the quality of the salt spray corrosion resistance of the product by using a manual method in its volume space to create a salt spray environment. . Compared with the natural environment, the salt concentration of the chloride in the salt spray environment can be several times or tens of times of the general nat