Comparison of corrosion behavior of 2205 and 2507 duplex stainless steel in simulated flue gas condensate of a waste incineration power plant

The corrosion behavior of duplex stainless steel 2205 DSS and 2507 DSS in simulated flue gas condensate of a waste incineration power plant at 180 degrees C was compared by micro-area electrochemical testing, surface and weight loss analysis. The results showed that the corrosion resistance of the two stainless steels decreased with the increase of Cl- concentration. After 48 h of corrosion, when the Cl- concentration was not less than 6 g.L-1, active sites where current density increased suddenly appeared on the surface of 2205 DSS, accompanied by the obvious increase of surface roughness and the weight loss. The lowest Cl- concentration that caused the appearance of active sites on the surface of 2507 DSS was 20 g.L-1, with less surface corrosion products and lower degree of general corrosion.

Automated summary

The corrosion resistance of duplex stainless steel 2205 DSS and 2507 DSS decreased with increasing Cl- concentration in simulated flue gas condensate environment. Active sites appeared on the surface of 2205 DSS at a lower Cl- concentration compared to 2507 DSS, resulting in higher surface roughness and weight loss.2507 DSS exhibited lower degree of general corrosion and less surface corrosion products.