Abstract
To study the effects of condensed acid liquid, hereafter referred to as condensate, on the CO2 transport pipeline steels, gas mixtures containing a varying concentration of H2O, O2, NO2, and SO2, were proposed and resulted in the condensate containing H2SO4 and HNO3 with the pH ranging from 0.5 to 2.5. By exposing the pipeline steel to the synthetic condensate with different concentration of acidic components, the corrosion kinetic is significantly changed. Reaction kinetic was studied using electrochemical methods coupled with water analysis and compared with surface analysis (scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffractometry (XRD)) of corroded coupons. The results showed that, although the condensation of NO2 in the form of HNO3 causes faster general corrosion rate, it is the condensation of SO2 in the form of H2SO4 or the combination of SO2 and NO2 that may cause much more severe problems in the form of localized and pitting corrosions. The resulting corrosion forms were depended on the chemical nature of acids and their concentration at the same investigated pH. The effects of changing CO2 flow rate and renewing condensate on pitting corrosion were further studied.
Highlights
Carbon dioxide has been identified as one of the main contributors to global warming, leading to a 20 cm increase of average sea level from 1901 to 2010
NO2 in the form of HNO3 causes faster general corrosion rate, it is the condensation of SO2 in the form of H2 SO4 or the combination of SO2 and NO2 that may cause much more severe problems in the form of localized and pitting corrosions
The resulting corrosion forms were depended on the chemical nature of acids and their concentration at the same investigated pH
Summary
Carbon dioxide has been identified as one of the main contributors to global warming, leading to a 20 cm increase of average sea level from 1901 to 2010. Carbon Capture, Utilization, and Storage (CCUS) has been proposed and proven as a technology of choice for the mitigation of CO2 emissions and to reach the GHG reduction target [1,2,3,4,5]. Many capture technologies are available for industrial applications such as pre-, post-combustion capture, oxyfuel combustion and solvent absorption [6,7,8,9]. They are not always directly installed at the CO2 storage/reuse sites, indicating a need for CO2 transportation network [10]. As the reliability and cost-effectiveness of the pipeline transport network are crucial to the overall operability and resilience of the CCUS system, it is vital to realize the possible corrosion risks of the employed pipeline steels corresponding to the impurity level of the gas source
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