As we all know that the valve body like carbon steel (WCB, WCC, LCB, LF2, A105), stainless steel (SS304, SS316, F304L, F316L), hastelloy (Alloy 20) etc., or even in the trim material always use metallic materials.

Most of the corrosion of metallic materials occurs in the atmosphere, which contains corrosive components and corrosive factors such as oxygen, humidity, temperature changes and pollutants. Salt spray corrosion is a common and most destructive atmospheric corrosion.

The salt spray test is divided into two categories, one is the natural environmental exposure test, and the other is the artificial accelerated simulated salt spray environmental test. The artificial simulated salt spray environment test uses a test equipment with a certain volume space, the salt spray test chamber, to artificially use the salt spray environment in the volume space to assess the salt spray corrosion resistance quality of the product.

Compared with the natural environment, the salt concentration of the chloride in the salt spray environment canbe several times or dozens of times that of the salt spray content of the general natural environment, so that the corrosion rate is greatly improved, and the product is subjected to a salt spray test to obtain a result. The time is also greatly shortened. If a product sample is tested in a natural exposure environment, it may take 1 year to corrode, and in a simulated salt spray environment, as long as 24 hours, similar results can be obtained.