48 hours of salt spray test is equivalent to several years of natural environment

Salt spray test is an accelerated corrosion resistance evaluation method of artificial atmosphere. It is to atomize a certain concentration of salt water; then spray it in a closed constant temperature box, and reflect the corrosion resistance of the tested sample by observing the changes of the tested sample after being placed in the box for a period of time. It is an accelerated test method. The salt concentration of chloride in the salt spray environment is several times or dozens of times that of the salt spray content in the general natural environment, which greatly increases the corrosion rate. The time to obtain the results of the salt spray test on the product is also greatly shortened.

1. Salt spray test is mainly divided into 4 types:

1. Neutral salt spray test (NSS);

2. Acetic acid salt spray test (AASS);

3. Copper accelerated acetic acid salt spray test (CASS);

4. Alternating salt spray test

2. Salt spray test time

How long does a 48-hour neutral salt spray test correspond to in the natural environment? This question is not recognized by the industry. The reason is very simple. The environment is too different. A simple example is that the temperature of the salt spray test is constant. There is a temperature difference in the natural environment. It does not mean that the higher the temperature, the more demanding it is. In fact, the greater the temperature difference, the more demanding it is. The principle is very simple. The salt spray test is only a means to test a product or compare several products, and it has been expanded. If you have to say that the salt spray corresponds to the actual time, it can be said that the 48-hour standard test can reach the constant temperature standard for about 1 year.