The neutral salt spray test is the most widely used test method to determine the corrosion performance of coatings. The test time can vary from 8 to 3000 hours depending on the type of coating. Depending on the ASTM b 117 standard, a 5% sodium chloride (NaCl) solution in deionized water with a solid solution of not more than 200 ppm and a Ph value between 6.5 and 7.2 is sprayed into the container to create a corrosive environment similar to a marine atmosphere. According to the same standard, the temperature of the salt spray test cabinet must be kept constant at 35 + - 2 C in the area exposed to the test environment inside the cabinet.
ASTM B 117 neutral salt spray test is a test that accelerates the bond damage of metal substrate and paint or coatings. With this test, the corrosion behavior of many coatings and materials can be compared and estimated information about their service life can be obtained.