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.
Humidity Test(General Motors)
Can be used to test coated specimens by exposing them to water fog at an elevated temperature, using apparatus similar to that used for salt spray testing to ASTM B117.
Test specimens are placed in an enclosed chamber that meets the apparatus requirements of ASTM B117. Here they are exposed to a continuous indirect spray water, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +38C and a humidity of 100%RH. This climate is maintained under constant steady state conditions. The test duration is variable.
For further information on General Motors standards visit; www.global.ihs.com