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 CO2 and 50°C. 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).

Subject
Scanning electron microscopy, Energy dispersive X-ray spectroscopy, Steel surfaces, Water, Corrosion rate, Autoclaves, Aqueous environments, Pipelines, Corrosion products, Steel, Sulfur dioxide, Oxygen, Carbon steel
Keywords:
Supercritical CO2, CO2 corrosion, O2, SO2, carbon steel, CO2 sequestration
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2010
Association for Materials Protection and Performance (AMPP)
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