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
Nissan NES M0158 – Methods of Compound Corrosion Test
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.
As a rule, the testing equipment shall have the ability to generate and automatically repeat 3 different processes, i.e. salt solution spraying or immersion, drying and moistening.
- CCT-I Corrosion resistance in general (surface rust and penetrated rust): Vehicle body panel, road wheel, under-floor piping, drive shaft, propeller shaft, fastening parts (bolts and nuts) etc.
- CCT-IV External panel scab rust: External panel, external topcoat
- CCT-V Internally accelerated penetration of rust: Internal panel, box structure parts
See the hyperlinks above for information on each individual test standard