An investigation into the effects of chloride ion concentration and crevice geometry on denting corrosion

It has been reported that Stress Corrosion Cracking (SCC) can lead to damage of the steam generator tubes in a nuclear power plant. Denting corrosion can occur between the steam generator tubes and tube support plate (TSP) or top of tube sheet (TTS), and it is therefore considered that denting is one of the factors related to the occurrence of SCC. Denting occurs when brackish or seawater is used for the cooling system. On the other hand, it has been known that oxidizers such as dissolved oxygen can create acidification at the crevice region in the case of pure-water cooling. These factors regarding the denting phenomenon have been evaluated based on the concentrations of dissolved oxygen, chloride ion, temperature, pH, crevice geometry, and so on. In this work, we look into the effects of crevice geometry and chloride ion concentration on the denting corrosion rate