Corrosion Resistance of Several Metal Materials in Corrosive Environment of Low-Temperature Flue Gas in a Waste Incineration Power Plant

Corrosion behavior of two duplex stainless steels 2205 DSS and 2507 DSS, two titanium alloys TA2 and TA10 in mixed solution of ash and water on the flue gas side of a low-temperature heat exchanger for waste heat utilization in a waste incineration power plant was studied by polarization curve, micro-area electrochemical testing and microscopic surface morphology observation. And the corrosion resistance of these metals was compared. The results showed that the corrosion resistance of 2205 DSS and 2507 DSS decreased with the increase of immersion time. After 3 days of immersion, active sites where current density increased suddenly appeared, and pitting corrosion occurred on the surface of 2205 DSS and 2507 DSS. 2205 DSS was general corroded after 8 days of immersion, showing the lowest corrosion resistance in the four metals. There was no obvious corrosion occurred in TA2 and TA10 during test, and their corrosion resistance was significantly better than those of two duplex stainless steels.