Corrosion Testing by Salt Spray

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Salt spray (fog) testing is the most popular form of testing for protective coatings. These tests have been used for more than 90 years as accelerated tests in order to determine the degree of protection afforded by both inorganic and organic coatings on a metallic substrate.

The neutral salt spray (fog) test (ASTM B 117): is perhaps the most commonly used salt spray test in existence for testing inorganic and organic coatings, in particular where such tests are used for material or product specifications. The duration of the test can range from 8 to over 3000 hours, depending on the product. A 5% sodium chloride solution containing not more than 200 parts per million (ppm) total solids and with a pH range of 6.5 to 7.2 is used. The temperature of the salt spray chamber is controlled to maintain 35°C +1.1 or -1.7°C (95°F +2 or -3°F) within the exposure zone of the closed chamber.

Salt spray testing can also be performed in a salt spray chamber according to DIN 50 021 "Salt spray test with different sodium chloride solutions"(e.g. for a period of 30 days with visual controls after 1, 7 and 30 days and weight controls before the test and after 30 days). These tests can be supplemented by e.g. metallography.