What is artificial simulated salt spray test?
The artificial simulated salt spray test includes neutral salt spray test, acetic acid salt spray test, copper salt accelerated acetate salt spray test and alternating salt spray test.
(1) Neutral salt spray test (NSS test) is one of the earlier accelerated corrosion test methods in the application field. It uses a 5% aqueous solution of sodium chloride and adjusts the pH of the solution to the neutral range (6-7) as a spray solution. The test temperature is 35°C, and the sedimentation rate of salt mist is required to be 1 to 2 ml/80 cm 2 h.
(2) The acetic acid salt spray test (ASS test) was developed on the basis of the neutral salt spray test. Add glacial acetic acid to 5% sodium chloride solution to reduce the pH value of the solution to about 3, the solution is acidic, and the salt spray formed after drunkenness also changes from neutral salt to acidic. spray. It corrodes about 3 times faster than the NSS test.
(3) The copper salt accelerated acetic acid salt spray test (CASS test) is a rapid salt spray corrosion test recently developed abroad. The test temperature is 50°C. A small amount of copper salt - copper chloride is added to the salt solution to strongly induce corrosion. . Its corrosion rate is about 8 times that of NSS test.
(4) The alternating salt spray test is a comprehensive salt spray test, which is actually a neutral salt spray test plus a constant damp heat test. It is mainly used for cavity type machine products. Through the penetration of the tidal environment, not only the surface of the product but also the salt spray corrosion will be generated inside the product. It uses the product alternately under salt water and hot and humid environmental conditions, and finally checks whether the electrical and mechanical properties of the entire product have changed.
