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.


Mazda MES MN 601G  Test Method for Paint Film

Section 27 for this test standard discusses the 5 class requirements for corrosion testing

Class 1 – Salt Spray Test

Class 2 – Perforation Corrosion Resistance Test

Class 3 – Scratch Corrosion Resistance Test

Class 4 – Edge Corrosion Resistance Test

Class 5 – Filiform Corrosion Resistance Test

Class 3-4 are commonly referred to as MAZDA MCT-3M which requires a fully enclosed chamber to perform the following test steps:

  • 1 hour Salt Spray @ 35°C in accordance with JIS Z 2371
  • 6 hours Drying @ 60°C /  10-30%RH
  • 1 Hour wetting @ 50°C / 95% RH

The test profile runs for 8 hours and 180 cycles

This test can be ran in an Ascott Cyclic Chamber fitted with accessories ACC42 & ACC47