Impact of surface roughness and humidity on X70 steel corrosion in supercritical CO2 mixture with SO2, H2O, and O2

3D surface morphology of pit corrosion on the cleaned samples after removing products from corroded X70 steel samples, which were exposed to supercritical CO2 with 1.0 mol.% O2, 2.0 mol.% SO2 and relative humidity of 60%. The pit is about 56 μm deep, 40 μm wide, and 200 μm long.