Investigation of the effects of small flow rate and particle impact on high temperature CO2 corrosion of N80 steel

Abstract

The effects of flow rate and particle-wall impact on CO2 corrosion of N80 steel at high temperature were studied by surface analysis techniques and computational fluid dynamics (CFD) method. It shows that the corrosion product layer of FeCO3 generated at 180 °C is denser and more protective than that at 90 °C so that the corrosion rate is lower for the former. Flow corrosion decreases the formation of polycrystalline layers compared to the static corrosion, while particle-wall impact directly destroys them. The promotion effect of the flow and particle-wall impact on corrosion are significant at 90 °C, but very weak at 180 °C due to the faster formation rate of layers for the latter.