Corrosion Testing Standards

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.

Toyota TSH1555G Method C (CCT-C)

Toyota Laboratory Accelerated Cyclic Corrosion Test

This test procedure serves as a general purpose atmospheric corrosion test and can be applied to a wide variety of materials, coatings and interactions of materials.

It has been developed to allow the evaluation of the corrosion resistance of metals used in vehicle bodies where there is a significant influence of chloride ions, mainly as sodium chloride from winter road de-icing salt. This test 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.

Method C comprises the following 24 hour profile

  • 4 hours saltwater spraying @ 50°C
  • 5 hours forced drying @ 70°C / <30%RH
  • 12 hours wetting @ 50°C / 85-90%RH
  • 2 hours forced drying @ 70°C / <30%RH and
  • 1 hour natural drying in ambient conditions

The number of cycle repeats and therefore the test duration is variable.

The test allows for 30 mins transition time between each of the above steps and is commonly referred to as Toyota CCT-C