Abstract
► Different flue gas acids show different behaviors in supercritical CO 2 . ► Sulfuric acid does not diffuse into supercritical CO 2 to cause corrosion. ► Nitric acid is reactive and leads to severe materials losses. ► Hydrochloric acid is very reactive even towards high alloyed stainless steel. Carbon capture and storage (CCS) includes processing of supercritical carbon dioxide (scCO 2 ). The carbon dioxide (CO 2 ) stemming from flue gases contains acid forming impurities, especially in the case of coal fired power plants. In the present work, the mobility and reactivity of acids in supercritical scCO 2 was investigated. The corrosive attack of low alloyed carbon steel (material 1.0484) by water (H 2 O) alone in scCO 2 was negligible. Nitric acid (HNO 3 ) was very mobile and corrosive towards the carbon steel while sulfuric acid did not migrate through the scCO 2 to react with the steel surface. Hydrochloric acid in scCO 2 was very mobile and reactive towards both carbon steel and high alloyed test equipment. Gravimetric analyses revealed a severe material loss after corrosion in the presence of HNO 3 . Thickness measurements showed localized material losses.
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