Environmental testing Part 2 Tests – Test Kb: 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. One storage period of three days at 21C-25C at 45% – 55%RH is also required.
Horizontal and vertical test chambers
for salt spray, condensation humidity and cyclic corrosion tests.
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