What’s salt spray test?

Corrosion is the destruction or deterioration of a material or its properties under the action of the environment. Most corrosion occurs in the atmospheric environment, which 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 corrosion of salt spray on the surface of metal materials is caused by the electrochemical reaction of the chloride ions contained in the metal surface through the oxide layer and protective layer of the metal surface and the internal metal. At the same time, chloride ions contain a certain amount of hydration energy, and are easily absorbed by pores and cracks on the metal surface to displace and replace oxygen in the chlorinated layer, turning insoluble oxides into soluble chlorides, and turning the passivated surface into an active surface, resulting in a very bad adverse reaction to the product. The salt spray test is an environmental test that uses the artificial simulated salt spray environmental conditions created by the salt spray test equipment to evaluate the corrosion resistance of products or metal materials.

Application scenarios of salt spray test

The purpose of the salt spray test is to evaluate the salt spray corrosion resistance quality of products or metal materials. The test object may have permanent or temporary corrosion resistance, or may not have permanent or temporary corrosion resistance.

Salt spray test can be used as a method to check whether the tested material has anti-corrosion performance, can be used as a test method to quickly evaluate the discontinuity, porosity and breakage of organic and inorganic coatings, and can also be used as comparison of the workmanship quality of the samples with similar coatings.