Corrosion in Dense Phase CO2 – the Impact of Depressurisation and Accumulation of Impurities

Comparison of corrosion behaviour for X-65 carbon steel in supercritical CO2-saturated water and water-saturated/unsaturated supercritical CO2

“…no consideration is afforded to corrosion studies in the presence of SO x and NO x , as this is beyond the scope of this particular review in light of the fact the results are not directly comparable with the work conducted in this article. For information on the influence of impurities such as SO x and NO x on the corrosion of carbon steel in water-containing supercritical CO 2 systems, the reader is directed to the articles by Dugstad et al [23][24][25], Choi et al [8], Farelas et al [26] and Xiang et al [2,19,20] It is noting that a review of the work of Dugstad et al [23,29], Yong Hua et al [15] and Sim et al [3], indicates that localised corrosion of mild steel is significant in impurity-containing supercritical CO 2 . Hence, it is critical that levels of localised corrosion in such environments are accounted for.…”

Internal corrosion of carbon steel pipelines for dense-phase CO2transport in carbon capture and storage (CCS) – a review

“…Dugstad and colleagues [102] found that when the system contained CO2 and water only (488 and 1222 ppm), the corrosion rate recorded was below 0.1 mm/year. The introduction of 138 ppm SO2 increased corrosion rates to just over 0.1 mm/year and covered the samples in a black deposit.…”

“…The accumulation of such impurities can increase the corrosivity of the liquid phase significantly. [102] Very few experiments within the literature, other than the work of Dugstad et al [102] , focus on the level of corrosion potentially encountered as a result of depressurisaton and accumulation of impurities. Their research involved depressurisation experiments at 4 and 25°C in which autoclaves were vented via the gas phase.…”

Effect of impurity on the corrosion behavior of X65 steel in water-saturated supercritical CO2 system

“…Currently, worldwide CO 2 pipelines have a total length of over 6000 km [4]. However, for alleviating global climate change, about 10 Gt/year of CO 2 will need to be transported for geological storage by 2050, which will require the construction of 3000 twelve-inch or 1000 twenty-inch pipelines if the transporting velocity of CO 2 fluid is 1.5 m/s [5]. Considering the cost requirement, carbon steel (e.g., X65 steel, X70 steel) is still the most economic material that can be used for such an extensive pipe network.…”