Effects of pH and dissolved oxygen on electrochemical behavior and oxide films of 304SS in borated and lithiated high temperature water

► An experimental E-pH diagram for 304SS at 300 °C was constructed. ► The safe E-pH zone of 304SS enlarged in high-pH deaerated solution. ► Increasing pH value improved the protective property of the oxide film on 304SS. ► The protective property of the oxide film on 304SS was DO-independent.