Environmental engineering considerations & laboratory tests: Salt fog

Can be used to test the relative resistance to corrosion of coated and uncoated specimens, when exposed to a salt spray climate at an elevated temperature.

Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of neutral (pH 6.5 to 7.2) salt water solution, which falls-out on to the specimens at a rate of 0.5 to 3.0ml/80cm²/hour, in a chamber temperature of +35C. This climate is generally maintained under constant steady state conditions, but may also be cycled between salt spray for 24 hours and ambient air drying for 24 hours. The test duration is variable.