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This study was aimed at evaluating the effects of exposure time and SO 2  as one of the impurities on the corrosion behavior of steel pipeline transporting supercritical CO 2  during carbon capture and storage. Steel coupons were exposed to supercritical CO 2  with various concentrations of SO 2  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 SO 2  concentration within supercritical CO 2  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 CO 2  mainly consisted of siderite while iron sulfite hydrate was observed under in the presence of SO 2 .

Effect of exposure time with SO 2 as an impurity on the corrosion behaviour of pipeline steel in CCS transportation