Evolution of corrosion resistance of 310S stainless steel in carbonates melt at 650 °C

Evolution of electrochemical impedance and corrosion products is observed for 600 h on 310S stainless steel in carbonates melt at 650 degrees C under flowing CO2-2%O2 gas. Warburg impedance is observed throughout the course of corrosion. Corrosion proceeds with formation of oxides and their dissolution into the melt. The dissolution exposes Ni-rich metallic fragments to the surface as the oxidized macrocrystalline phases, and forms porous inner layer, resulting into the duplex corrosion products. Corrosion is not slowed down until formation of the second layer of corrosion products. The outer layer also does not offer sufficient protection to the inner layer and the substrate, so corrosion is evolving with time.

Automated summary

The evolution of electrochemical impedance and corrosion products was studied on 310S stainless steel in a carbonate melt at 650 degrees C under flowing CO2-2%O2 gas for 600 hours. The corrosion process involved the formation and dissolution of oxides, exposing metallic fragments and resulting in a porous inner layer. Insufficient protection from the outer layer led to continued corrosion.