The test standard summaries are for general guidance only. Though believed to be accurate at the time of writing, this may change over time. So this information should not be used as a substitute for referring to a complete test standard, at an appropriate revision level.
Note: the terms salt spray, salt mist & salt fog are all in wide spread use within corrosion test standards. In this context they can be considered to be equivalent and interchangeable terms.
Salt mist, cyclic
Can be used to test the relative resistance to corrosion of components or equipment, when exposed to a changing climate of a salt mist (spray), followed by a high humidity, at an elevated temperature.
Test specimens are placed in an enclosed chamber (a separate salt mist chamber and controlled humidity chamber are generally used), and exposed to a changing climate that comprises of the following 2 part repeating cycle. 2.0 hours exposure 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 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +15 to+35C. This is followed by either 7 days or 20 to 22 hours (depending on the test severity) exposure to a high humidity climate of 93%RH, in a chamber temperature of +40C. The number of cycle repeats is variable depending on the test severity.
For further information on IEC standards visit; www.iec.ch
Note; IEC 68-2-52 has been replaced by IEC 60068-2-52.
See IEC 60068-2-52 For breakdown of chamber specification vs test methods