Views:493 Author:Site Editor Publish Time: 2019-12-06 Origin:Site
Many friends have a lot of doubts about the salt spray test chamber. For example, how long is one hour equivalent to the natural environment during an experiment? In fact, we know that a sample of a product is tested under natural exposure. It may take up to one year for corrosion, and the test under artificial salt spray conditions can obtain similar results as long as 24 hours.
The salt spray test chamber also includes a neutral salt spray test, an acetate salt spray test, a copper salt accelerated acetate salt spray test, and an alternating salt spray test.
1. Neutral salt spray test (NSS test) is an accelerated corrosion test method that appears in a wide range of current applications. It uses a 5% sodium chloride aqueous solution, and the pH of the solution is adjusted to a neutral range (6 to 7) as a spray solution. The test temperature is 35 ° C, and the sedimentation rate of salt spray is required to be between 1 and 2ml / 80cm².h.
2. Acetic acid salt spray test (ASS test) was developed on the basis of neutral salt spray test. It is to add some glacial acetic acid to a 5% sodium chloride solution to reduce the pH value of the solution to about 3, the solution becomes acidic, and the salt mist formed from the neutral salt mist becomes acidic. Its corrosion rate is about 3 times faster than the NSS test.
The copper salt accelerated acetate spray test (CASS test) is a rapid salt spray corrosion test recently developed in foreign countries. The test temperature is 50 ℃. Strongly induces corrosion. Its corrosion rate is about eight times that of the NSS test.
The specific time is converted into:
Neutral salt spray test 24h ⇌ Natural environment 1 year
Acetic acid salt spray test 24h ⇌ Natural environment 3 years
Copper salt accelerated acetate spray test 24 hours ⇌ Natural environment 8 years
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