Corrosion behavior of 2205 stainless steel in simulated flue gas condensate with different chloride concentrations in a waste incineration power plant

The effect of Cl- on the initial corrosion behavior of 2205 duplex stainless steel (2205 DSS) in simulated flue gas condensate from a waste incineration power plant was investigated using Mott-Schottky plot, micro-area electrochemical methods, and microscopic surface morphology observation. The results show that at 150 degrees C, the carrier concentration of the 2205 DSS passive film was maintained at a small value and changed little when the Cl- concentration is less than 25 g/L, indicating that it has good pitting resistance. When the Cl- concentration reaches 30 g/L and above, the carrier concentration of the passive film increases remarkably, and pitting corrosion appears on the 2205 DSS surface. At 180 degrees C, there is no obvious pitting on the surface when the Cl- concentration is not more than 15 g/L. When the Cl- concentration is 20 g/L or above, the carrier concentration of the passive film significantly increases, and pitting corrosion appears on the surface. When the Cl- concentration reaches 30 g/L, the carrier concentration of the passive film increases sharply. The passive film on a 2205 DSS surface is seriously damaged and accompanied by the occurrence of uniform corrosion.