Corrosion evolution of 2205 duplex stainless steel in hot concentrated seawater under intermittent vacuum and boiling conditions

Abstract Long-term corrosion behavior of 2205 duplex stainless steel was investigated in the hot concentrated artificial seawater under intermittent vacuum boiling and atmosphere conditions during the immersion of more than one year by using electrochemical impedance spectroscopy (EIS). Compared to the atmosphere state, the passive film formed on specimen surface is thinner and the induction time for pitting corrosion decreases notably under intermittent vacuum boiling condition. However, the pit propagation is retarded by the lower dissolved oxygen content and violent boiling of solution. The vacuum boiling of solution has opposite effect on the initiation and stable growth processes of pitting corrosion.