Salt spray test method
Neutral Salt Spray Test (NSS)
Neutral salt spray test is a method of accelerated corrosion test , which is carried out in a special salt spray box . Corrosion resistance test for galvanized , cadmium-plated , oxidized and phosphatized coatings on steel parts. .
Neutral salt spray test was formulated in 5% NaCl saline solution, PH 6.5 to 7.2, the tank temperature was 35 ± 2? C, a relative humidity of 95% or more.
Neutral salt spray test spray settling is 1mL ~ 2Ml /
Steps for neutral salt spray test :
(1) Wash the surface of the sample with an organic solvent so that the surface of the sample is free of oil and other objects that are corrosive to the coating .
(2) Place the test piece in a salt spray box, and the test piece faces 15 mm to 30 mm from the vertical line .
(3) Conduct salt spray test according to the inspection cycle .
(4) Remove the sample and gently rinse with running water or gently wipe the surface with a sponge to remove salt. Deposit, then 80? C ~ 100? C drying about 30min.
(5) Judging the corrosion grade of the sample .
Acetate spray test (ASS method )
Mainly applicable Cu - Ni - Cr or nickel - chrome and other decorative coating corrosion resistance test, resistance test with the use of chemically pure glacial acetic acid acetic acid salt spray was formulated, is 3.0 to 3.1 PH, PH spray eluate was 3.2 ± 0.1 other requirements and test method for the same neutral salt spray test.
Copper salt accelerated acetate spray test (CASS method )
It is mainly suitable for the corrosion resistance test of decorative coatings such as copper - nickel - chromium or nickel - chromium on steel parts and zinc die-casting parts. It is also suitable for the corrosion resistance test of aluminum and aluminum alloy anodized films .
Test Method salt solution prepared as follows: a solution of NaCl prepared by neutral salt spray test in the method of adding 0.26 ± NaCl solution.
The test temperature is 50±1?C, and the spray collection pH is 3.2±0.1. Other requirements are the same as the neutral salt spray test .
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