In order to verify whether the metal parts on the product will corrode when exposed to the atmosphere or other environments, the product can be placed in the use environment for a long enough time, such as a life cycle of the product. This is time-consuming and labor-intensive, in practice It is rarely used.

This requires a convenient method to evaluate the corrosion resistance of the product.

The salt spray test is an accelerated anti-corrosion evaluation method of artificial atmosphere. It is to atomize a certain concentration of salt water, and then spray it in a closed constant temperature box, by observing the change of the tested sample after being placed in the box for a period of time. Reflects the corrosion resistance of the tested sample. It is an accelerated test method, that is, it takes a short time and does not require a few years, but only a few days or even a few hours.

Although the salt spray test is an effective test method. However, due to the many factors that affect corrosion, a single salt spray resistance cannot be used as a representative of the performance of other media, so the salt spray test result cannot be used as the test material to resist in all environments. A direct guide to corrosion performance. At the same time, the performance of the material in the test cannot be used as a direct guide to the corrosion resistance in use.

Nevertheless, the salt spray test method can still be used as a method for testing the tested material.