A good salt spray test chamber have two main features to note, the amount of sedimentation and spraying method.

     The amount of sedimentation in the salt spray test chamber is an important indicator for the qualified test. The amount of salt spray sedimentation reflects the characteristics of salt spray and is an important parameter in the salt spray test. The precipitation amount of salt spray test is mostly specified as 1~2ml/80㎝2·h. When the precipitation amount is less than 0.5ml/80㎝2·h, the salt liquid film on the metal surface is thin, and oxygen will quickly pass through the water film to reach the cathode surface, so the corrosion rate rises suddenly. As the precipitation amount increases, there is a medium-thick liquid film layer on the metal surface, and its corrosion rate rises slowly. When the precipitation amount continues to increase and exceeds 2ml/80㎝2·h, the salt liquid film layer on the metal surface thickens, the oxygen diffusion distance increases, and it is difficult to reach the cathode surface, so the corrosion rate does not accelerate significantly. Therefore, taking a moderate precipitation amount will make the corrosion rate more stable and the test results reproducible.

    Spraying method of salt spray test. Generally, continuous spray and intermittent spray are used. Intermittent spray can make the metal surface have periodic dry and wet alternation, so that the  liquid film on the metal surface can be renewed and oxygen can be continuously replenished, which is beneficial to accelerated corrosion and close to actual working and storage conditions. Continuous spray can keep the metal surface moist and have sufficient salt liquid film thickness. The test conditions of continuous spray are relatively stable and easy to control. Therefore, many salt spray test methods currently use continuous spray.

    HUDA's salt spray test chamber is an environmental reliability test that uses artificially simulated salt spray environment to assess the corrosion resistance of products or metal materials. By artificially simulating the salt spray environment, it is determined whether the product meets the product performance requirements in the salt spray corrosion environment. The purpose is to evaluate the corrosion resistance of metal materials and covering layers. It is suitable for evaluating the stability of product performance when stored or used in a salt spray corrosion environment.