Hydrogen permeation behaviours of high-strength steel 35CrMo under different cyclic wet-dry conditions were investigated by using Devanathan-Stachurski's technique. Four electrolytes were used: distilled water, seawater, seawater containing 1500ppm of H2S and seawater containing SO2. The corrosion weight loss of 35CrMo in the wet-dry cycles was measured simultaneously. The experimental results showed that hydrogen could be detected at the surface opposite to the corroding side of the specimen during wet-dry cycles and that the permeation current density during a wet-dry cycle exhibited a maximum during the drying process. The hydrogen permeation was obviously promoted by Cl2 ions, H2S and SO2. The hydrogen permeation in the real marine atmosphere has also been investigated. There was a clear correlation between the amount of hydrogen permeated and the corrosion weight losses.Hydrogen Permeation and Corrosion Behaviour of High Strength Steel 35CrMo under Cyclic Wet-Dry Conditions. Q.Yu, Y.L.Huang, C.Zheng: Corrosion Engineering, Science and Technology, 2008, 43[3], 241-7