Cyclic Corrosion Testing and Applicable Standards

In order to better test the aging resistance of coatings, an accelerated cyclic corrosion test (CCT) was developed. Compared with the traditional salt spray test, the cyclic corrosion test can more accurately reflect the corrosion resistance of the coating. Different independent experimental institutions have developed different CCT test methods to reflect the influence of temperature, ultraviolet radiation, freezing, alternating wet and dry, salt spray and other corrosive environments, and to test the performance expectations of the complete coating system.

The salt spray test uses 5% NaCl or artificial seawater as the electrolyte, which is closer to the marine environment, while the mixed solution of sodium chloride and ammonium sulfate in ASTM D 5894 is closer to the industrial and land corrosive environment.