Hours for a Salt Spray Test – A Full Guide from Effective Lab India's blog

A Salt spray test is conducted to test the resistance of metals and coatings against corrosion. Corrosion affects the coatings of metals badly and changes their properties, so it’s important to test the corrosion resistance properties of the materials before selling them in the market. This test is conducted by using a salt spray chamber. There are different types of salt spray test chambers that are being used according to the specific test type.

Moreover, the period for the salt spray test is according to the sample to be tested. There are different periods for conducting salt spray tests. Let us discuss.

In the 720-hour salt spray test, the sample is exposed to the test chamber for 720 hours. The temperature of the test is set to +35°C +1.1°C/ -1.7°C. Moreover, the compound used in the test is 5% sodium chloride and 95% water. In this test, users will have to wait for 720 hours until the exposure of salt spray.

In a 24-hour salt spray test, the specimens are placed for 24 hours. In this test, the sample to be tested is continuously exposed to the salt spray chamber during the testing period. The effects of corrosion on each sample should be noted in detail after every 24 hours. Moreover, after the predetermined time, the specimens are removed from the chamber and corrosion resistance is evaluated.

500-hour salt spray is intended to predict the performance of oil to protect metals from rust. In this test, steel panels are dipped in an oil test and then they are placed in a salt fog chamber for a predetermined time (500 hours). For rust development, panels are evaluated daily. Hence, the rust on metals is reported accordingly.

A salt spray test chamber is conducted to test the corrosion resistance of different products. In this test, the samples are placed in a closed chamber and then a thick metal fog is exposed to them for simulating severely corrosive conditions. A sodium chloride solution with a pH range of 6.5 to 7.2 is employed in this test and the time duration for this test is typically from 8 to 3000 hours.

In this test, the specimens are placed into a closed testing chamber. A high concentration of salts is exposed on the specimens for 480 hours. After the set period, the specimens are taken out and examined if there are any signs of corrosion on them.