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Abstract
The corrosion of X70 steel and iron in supercritical CO2/SO2/O2/H2O environment were investigated after a 454 h exposure. Optical microscopy was applied to observe the morphology of etch pits and synthesise the three-dimensional morphology. X-ray diffraction and X-ray photoelectron spectroscopy were employed to detect the composition of product scales. Experimental results verified that the localised corrosion occurred on the X70 steel sample under corrosion product deposits. Ferrous sulphate, sulphur and iron sulphide were detected as the corrosion products.
This research was financially supported by the National Natural Science Foundation of China (grant no. 51061130536).