Abstract
The corrosion behavior of X70 steel in CO2 saturated water at 60 °C and 10 MPa was investigated by limiting the exposed solution volumes. When the specific solution volume to the exposed area was smaller than 10 mL/cm2, it revealed the formation of protective FeCO3 layer, leading to a significant corrosion reduction. The time-sensitive nucleation and the spatial growth of FeCO3 grains governed the overall performance of corrosion product layers. The solution volume dependency was further explained by a diffusion-controlled deposition mechanism. It suggested a possible way to prevent CO2 corrosion in harsh environments by generating stable FeCO3 layers.
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