Effect of environmental factors on hydrogen absorption into steel sheet under a wet-dry cyclic corrosion condition

Abstract

Effect of temperature and chloride deposition on hydrogen absorption into steel was evaluated under wet-dry cyclic corrosion conditions by using a temperature compensated hydrogen absorption monitoring system which is based on electrochemical hydrogen permeation method. Peaks of hydrogen permeation current were detected during the wetting and drying periods in the wet-dry cyclic corrosion conditions. Hydrogen absorption was increased with increasing temperature and chloride deposition. It was suggested that the hydrogen absorption behavior under the wet-dry cyclic corrosion conditions is related to the change in solution chemistry during the wetting and drying periods where the increase of chloride ion concentration and the decrease in pH due to hydrolysis reaction of Fe3+ occurred. Based on these results, the amount of absorbed hydrogen map effected by temperature and chloride deposition in atmospheric corrosion environment was described.