This study was aimed at evaluating the effects of exposure time and SO2 as one of the impurities on the corrosion behavior of steel pipeline transporting supercritical CO2 during carbon capture and storage. Steel coupons were exposed to supercritical CO2 with various concentrations of SO2 for durations up to 1512 hours. Weight loss measurements were performed to evaluate the steel corrosion behavior. The weight loss results revealed a decrease in corrosion rate with an increase in exposure time which was mainly attributed to the gradual increase of the mineral layer on the steel surface. The increase in SO2 concentration within supercritical CO2 increased the corrosion rate from 0.0109 mm/yr to the highest value of 1.396 mm/yr. X-ray diffraction analysis revealed that the mineral layer formed on the steel surface under pure supercritical CO2 mainly consisted of siderite while iron sulfite hydrate was observed under in the presence of SO2.
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