1, road traffic: road vehicle electronic and electrical equipment, rail transportation rolling stock equipment and devices, automotive parts and components
2, computer class: computer, display, host, computer components, medical equipment and other precision instruments
3, electronic communications: cell phones, radio frequency apparatus, electronic communications components, etc., PCB, PCBA.
4, electrical appliances: home appliances, lamps and lanterns, transformers and other types of home appliances and electrical equipment, instruments, medical equipment;
5, other: plating, coating, packaging boxes, transportation equipment, and so on.
Salt spray test method
1, neutral salt spray test (NSS test)
is the earliest emergence of one of the most widely used accelerated corrosion test method. It uses 5% sodium chloride saline solution, solution PH value adjusted in the neutral range (6 ~ 7) as a spray solution. Test temperature are taken 35 ℃, the requirements of the salt spray settlement rate of 1 ~ 2ml/80cm2.h between.
2, acetate salt spray test (ASS test)
It is developed on the basis of neutral salt spray test. It is to add some glacial acetic acid in 5% sodium chloride solution, so that the PH value of the solution is reduced to about 3, the solution becomes acidic, and the final formation of salt spray also becomes acidic from neutral salt spray. Its corrosion rate is about 3 times faster than NSS test.
3, copper salt accelerated acetic acid salt spray test (CASS test)
It is a newly developed foreign rapid salt spray corrosion test, the test temperature of 50 ℃, salt solution with a small amount of copper salt - copper chloride, strongly induced corrosion. Its corrosion rate is about 8 times that of the NSS test.
4, alternating salt spray test
It is a comprehensive salt spray test, which is actually neutral salt spray test plus constant humidity and heat test. It is mainly used for cavity type of the whole product, through the penetration of the humid environment, so that the salt spray corrosion is not only produced on the surface of the product, but also inside the product. It is the product in the salt spray and humid heat two environmental conditions alternately, and finally assess the electrical and mechanical properties of the whole product with or without changes.
Three, salt spray test reference standards:
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