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

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 degrees C is denser and more protective than that at 90 degrees 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 degrees C, but very weak at 180 degrees C due to the faster formation rate of layers for the latter.

Automated summary

The effects of flow rate and particle-wall impact on CO2 corrosion of N80 steel at high temperature were investigated. The results showed that the corrosion product layer formed at 180 degrees C was denser and more protective, leading to a lower corrosion rate compared to that at 90 degrees C. Flow corrosion reduced the formation of polycrystalline layers, while particle-wall impact directly destroyed them. The promotion effect of flow and particle-wall impact on corrosion was significant at 90 degrees C, but weak at 180 degrees C due to faster formation rate of protective layers.