Salt spray corrosion test

Salt spray test is an environmental test that uses artificial simulated salt spray environmental conditions created by salt spray testing equipment to confirm the corrosion resistance of products or metal materials. The severity of the test depends on the duration of the exposure.

Salt spray test can be divided into three categories: neutral salt spray test, acetate salt spray test, and copper salt accelerated acetate salt spray test.
(1) Neutral salt spray test (NSS test) is the earliest accelerated corrosion test method with the widest application field. It uses 5% sodium chloride salt solution, and the pH value of the solution is adjusted to a neutral range (6.5~7.2) as the spray solution. The test temperature is all 35°C, and the sedimentation rate of salt spray is required to be 1~2ml/80cm/h.
(2) The acetate salt spray test (ASS test) is developed on the basis of the neutral salt spray test. It adds some glacial acetic acid to a 5% sodium chloride solution to reduce the pH value of the solution to about 3, making the solution acidic, and the resulting salt spray also changes from neutral salt spray to acidic. Its corrosion rate is about 3 times faster than the NSS test.
(3) The copper salt accelerated acetate 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 approximately 8 times that of the NSS test.

GB/T 2423.17 Environmental testing of electrical and electronic products
IEC60068-2-11 Environmental testing of electrical and electronic products
ASTM_B117 operating salt spray test machine
GJB 150.1 General Principles of Environmental Test Methods for Military Equipment

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