For transporting large amounts of CO2 (compressing to supercritical or liquid state) over long distance during Carbon Capture and Storage process, the most logical and economical option is pipelines network made from carbon steels such as X65 and X70 steels, which, however, is susceptible to corrosion in the supercritical CO2 systems containing free water. This work aims to evaluate the performance of the newly developed Cr-containing steels, which fills the gap between carbon steels and anticorrosion alloys in view of the cost and corrosion resistance, in the static and dynamic water-saturated supercritical CO2 environments. Results showed that X70 and 3Cr steels mainly suffered from localized corrosion, and both the general and localized corrosion rates under static condition were higher than that under dynamic condition. 3 wt.% Cr content was unable to effectively enhance the corrosion resistance of the steel. However, 6.5Cr steel presented superior localized corrosion resistance in supercritical CO2 environments, and could be selected as a replacement for carbon steel under these conditions.

Subject
Energy dispersive X-ray spectroscopy, Water, Corrosion rate, Autoclaves, Surface morphology, Corrosion products, Corrosion scales, Steel, Pitting, Carbon steel, Corrosion resistance, Localized corrosion, Grain
Keywords:
supercritical CO2 corrosion, CCS, Cr-containing steel, localized corrosion
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2019
Association for Materials Protection and Performance (AMPP)
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