Salt spray testing is an environmental test that artificially simulates salt spray environmental conditions to assess the corrosion resistance of products or metal materials. Salt mist mainly plays a corrosive role on metal materials, and electrochemical reactions occur with internal metals through chloride ions contained in the salt mist penetrating the oxide layer and protective layer on the metal surface. The hydration of chloride ions is easily adsorbed in the pores and cracks of the metal surface and replaces the oxygen in the oxide layer, turning insoluble oxides into soluble chlorides, and turning passive surfaces into active surfaces. So as to consider the corrosion resistance of metals.

The main types of salt spray test are neutral salt spray. 5% sodium chloride saline solution is used, and the pH value of the solution is adjusted to the neutral range (6.5~7.2) as the solution for spray. Acetate fog is the addition of some glacial acetic acid to a 5% sodium chloride solution to reduce the pH value of the solution to about 3, and the solution becomes acidic. Copper salt accelerated acetate fog is the addition of a small amount of copper salt copper chloride to the salt solution, strongly inducing corrosion. The alternating salt spray test is a comprehensive salt spray test, which is actually a neutral salt spray test plus a constant damp heat test.

Salt spray test is an important means to assess the salt spray corrosion resistance of products or materials, and the scientific and reasonable test results are crucial. Therefore, test personnel need not only solid professional knowledge and skills, but also rich practical experience and a comprehensive understanding of the product.

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