Effect of silty sand in formation water on CO2 corrosion behavior of carbon steel

Silty sand (SiO2) promoted the rapid heterogeneous nucleation of corrosion product (FeCO3) and simultaneously decreased its grains growth. Silty sand mixed with corrosion product to form the outer layer of corrosion scale with high compactness, blocking the transport of ferrous ions and leading to the formation of the inner layer of corrosion scale without silty sand. The corrosion rate of carbon steel was obviously reduced due to the existence of silty sand in the outer layer by inhibiting anodic and cathodic currents.