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 and 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.
An accelerated corrosion test under complex environment shall be performed in accordance with CCT-B of MS600-66
Step 1: Salt Spray @ 35C / 95% RH for 4 hours
Step 2: Drying @ 70C / 30%RH for 2 hours
Step 3: Wetting @ 50C / 95%RH for 2 hours
Step 4: Ambient Drying @ 25C / 60%RH for 1.5 hours
Step 5: Cooling @ -20C for 2.5 Hours
From step 1 to step 2 = 30 minutes
From step 2 to step 3 = 20 minutes
From step 3 to step 4 = 20 minutes
From step 4 to step 5 = 60 minutes
From step 5 to step 1 = 20 minutes
The entire cycle is 12 hours and repeatable