Neutral salt spray test method

Neutral salt spray test method, acetate spray test method, copper salt accelerated acetate spray test method

(1) Neutral salt spray test (NSS test) is a widely used accelerated corrosion test method that has emerged earlier. It uses 5% sodium chloride saline solution, and the solution PH value is adjusted in the neutral range (6-7) as the solution for spray. The experimental temperature is set at 35 ℃, and the sedimentation rate of the salt spray is required to be between 1-2ml/80cm2. h. 

(2) The acetate spray test (ASS test) was developed based on the neutral salt spray test. It involves adding some glacial acetic acid to a 5% sodium chloride solution, reducing the pH value of the solution to around 3.0-3.2, causing the solution to become acidic. The resulting salt mist also changes from neutral to acidic. Its corrosion rate is about three times faster than the NSS test.

 (3) The Copper Salt Accelerated Acetate Spray Test (CASS Test) is a newly developed rapid salt spray corrosion test abroad. The test temperature is 50 ℃, and a small amount (0.26g/1 liter of salt water) is added to the salt solution to strongly induce corrosion. Its corrosion rate is approximately 8 times that of the NSS test.