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.
Nissan NES M0158 – CCT 5 (CCT-V)
This Nissan engineering standard specifies the method to measure compound corrosion that uses the combined processes of salt spraying or salt solution immersion followed by drying and moistening. The process will simulate and accelerate corrosion of metal materials used on automobiles. Therefore this test will measure corrosion of metals of functional decorative parts together with the coating effect of inorganic or organic plating of vehicle models.
It is an accelerated laboratory corrosion test method that can be used to determine the corrosion resistance of automotive assemblies and components. It is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.
Test specimens are placed in an enclosed chamber and exposed to a changing climate that comprises of a relatively short period of salt immersion, followed by exposure to hot/humid and hot/dry atmospheres. 1 entire test cycle takes 2 hours to execute. The number of entire cycle repeats and therefore the test duration is variable.
The main test cycle begins with 5 minutes salt water immersion at 60°C followed by 55 minutes of drying at 80°C , Humidity less than 30%rh . The final step is wetting at 60°C / 95%RH for 1 hour.
The total cycle is 2 hours and repeatable
The atmosphere in the chamber must be “instant setting” with a transition time of less than 10 seconds, and 1 cycle should take 2 hours. However, the process of Drying → Moistening should take less than 30 minutes.