The objective of the present study is to evaluate the corrosion properties of carbon steel in
supercritical CO2/H2O/O2/SO2 mixtures related to the transmission of CO2 to sequestration
sites. The corrosion property of carbon steel was evaluated by using an autoclave with
different impurities at 80 bar CO22 and 50oC. The concentrations of O2 and SO2 were changed
from its maximum concentrations in supercritical CO2 phase (4% for O2 and 1% SO2). The
corrosion rate of samples was determined by weight loss measurements. The surface
morphology and the composition of the corrosion product layers were analyzed by using
surface analytical techniques (SEM, EDS, and Raman spectroscopy). In addition, a mitigation
strategy for corrosion of CO2 transport pipelines was suggested by utilizing corrosion resistant
alloys (CRA).
Key words: Supercritical CO2, CO2 corrosion, O2, SO2, carbon steel, CO2 sequestration