This standard defines an accelerated corrosion test method to be used in assessing the corrosion resistance of metals in environments where there is a significant influence of chloride ions, mainly as sodium chloride from a marine source or by winter road de-icing salt. It specifies a test procedure to be used in conducting the accelerated corrosion test to simulate atmospheric corrosion conditions in a controlled way.
The 7 day main test cycle is composed of two twelve-hour sub-cycles, one with controlled humidity cycling, the other including salt solution application.
Sub cycle 1 requires four hours of constant conditions at 35°C & 95% RH, followed by an increase of temperature to 45°C whilst reducing the humidity to 50% over a 2 hour period. This is followed by constant conditions of 45°C & 50% RH for four hours, followed by a 2 hour period of transition to 35°C & 95% RH
Sub cycle 2 requires spraying with salt solution for 15 mins then subjecting the samples to 35°C for one hour forty five minutes whilst maintaining a relative humidity of 95% – 99% RH to ensure the test samples remain wet. These steps are repeated to give a total period of 6 hours. This is followed by drying at 45°C & 50% RH for a two hour period followed by a further 2 hours of 35°C whilst maintaining 95% RH.
Horizontal and vertical test chambers
for salt spray, condensation humidity and cyclic corrosion tests.