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

Toyota TSH1555G Method A+B

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.

The test comprises 3 alternative 24 hour single cycles, methods A, B and C.

Method A comprises 17 hours saltwater spraying, 3 hours forced drying, 2 hours saltwater dipping and finally 2 hours natural drying.

Method B comprises 1 hour saltwater spraying, 16 hours wetting, 4.5 hours forced drying, 1 hour saltwater dipping and finally 1,5 hours natural drying.

Method C comprises 4 hours saltwater spraying, 5 hours forced drying, 12 hours wetting, 2 hours forced drying and finally 1 hour natural drying.

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

This test is also referred to as a Cyclic Corrosion Test, often abbreviated to CCT.