Salt spray corrosion is a common and most damaging atmospheric corrosion.

Salt spray test is a major use of salt spray test equipment created by the artificial simulation of salt spray environmental conditions to assess the corrosion resistance of products or metal materials, environmental testing. It is divided into two categories, one for the natural environmental exposure test, the other for the artificial acceleration of salt spray environmental test. Artificial simulation of salt spray environmental test is the use of a certain volume of space test equipment - salt spray test chamber, in its volume space with artificial methods, resulting in salt spray environment to the product of salt spray corrosion performance quality assessment The It is compared with the natural environment, its salt spray environment chloride concentration of salt, can be the general natural salt spray content of several times or several times, so that the corrosion rate greatly improved, the product salt spray test, the results The time is greatly shortened.

Artificial simulated salt spray test also includes neutral salt spray test, acetate fog test, copper salt accelerated acetic acid salt test, alternating salt spray test.

Guideline:
GB / T 2423.17; IEC 60068-2-11; GB / T 10125; ISO 9227;
ASTM B 117; GB / T 2423.18; IEC 60068-2-52; ASTM B 368; MIL-STD-202; EIA-364-26

(1) neutral salt spray test (NSS test)
Is the earliest application of the most widely used in an accelerated corrosion test method. It uses 5% sodium chloride solution, the pH value of the solution in the neutral range (6 ~ 7) as a spray solution. The test temperature is 35 ℃, requiring salt fog sedimentation rate of 1 ~ 2ml / 80cm2.h between.

(2) Acetate spray test (ASS test)
Is based on the neutral salt spray test developed on the basis of. It is in 5% sodium chloride solution by adding some glacial acetic acid, the solution of the PH value is reduced to about 3, the solution becomes acidic, and finally the formation of salt mist from neutral salt mist into acidic. Its corrosion rate than the NSS test about 3 times faster.

(3) copper salt accelerated acetic acid salt test (CASS test)
Is a newly developed abroad, a rapid salt spray corrosion test, the test temperature of 50 ℃, salt solution by adding a small amount of copper salt - copper chloride, strongly induced corrosion. Its corrosion rate is about 8 times the NSS test.

(4) 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 tidal environment of the infiltration, so that salt spray corrosion not only in the product surface, but also within the product. It is the product in the salt mist and hot and humid two kinds of environmental conditions under the alternating conversion, the final assessment of the whole product electrical properties and mechanical properties have changed.