an be divided into three categories:
(1)Neutral salt spray test,
(2) Acetate salt spray test,
(3)Copper salt accelerated acetate salt spray test
(1) The neutral salt spray test (NSS test) is the earliest and most widely used accelerated corrosion test method. It uses 5% sodium chloride salt water solution, and the PH value of the solution is adjusted to a neutral range (6.5 ~ 7.2) as a spray solution. The test temperature is 35℃, and the sedimentation rate of salt spray is required to be 1～2m