Salt spray testing is a test method for evaluating a product or a coating's resistance to corrosion in the face of extended exposure to a saline, or salted, spray.

A cost-effective corrosion testing method, salt spray testing is conducted in a closed salt spray chamber where the sample is subjected to a sodium chloride fog, an extremely corrosive atmosphere. The length of exposure time is determined by the material, the coating, and the standard.

Types of salt spray testing: NSS, ASS, CASS

Most frequently used to measure the corrosion-resistance of coatings and paints, the salt spray test can be adapted to different corrosivity levels to simulate different environments—the difference between the Indian Ocean and the Great Salt Lake, for example.  

Variations include: A standardized 5% solution of NaCl, known as NSS or neutral salt spray; acetic acid or ASS test, and acetic acid with copper chloride or CASS test. The solution is chosen based on the  specific coating being evaluated, such as electroplated copper-nickel-chromium, electroplated copper-nickel or anodized aluminium. 

Other salt variations: Calcium Chloride (CaCl2

Other Corrosion Testing

Cyclic Corrosion Testing (CCT)

detail

Standards

American Society for Testing and Materials
ASTM D1735, ASTM D5894, ASTM G 85 (Annex A1, A2, A3, A5)
Department of Defense
NASM 1312- 1
Deutches Institut für Normung
DIN 50021
International Electrotechnical Commission
IEC 60068-2
International Standards Organization
ISO 9227
Japanese Industrial Standard
JIS Z2371
Military Standards
DEF STAN 00-35, MIL-STD-202 E/F/G (Method 101), MIL-STD-810 E/F/G (Method 509), MIL-STD-1312-01, RTCA/DO-160 E/F/G (Section 14)
Various Customer Standards
Delphi DX900158, GM4298P, GM4476P, GM9540P, GM4345M

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