Abstract
Carbon capture and storage (CCS) is the recent promising technology aimed at
reducing greenhouse gas emission. Like many other developed technologies, CCS is faced with
great challenges such as pipeline transportation failure due to corrosion. There are many factors
contributing to steel corrosion during the pipeline transportation of carbon dioxide (CO2). This
study focuses on CO2 partial pressure and different phases of CO2 as some of the factors
contributing to steel corrosion. Carbon steel was used as a testing specimen. High pressure
reactor was used in this study to compress CO2 from low to high pressures ultimately changing
the CO2 from gaseous phase to gas/liquid phase (subcritical) and to dense phase (supercritical).
Weight loss method was employed to determine the corrosion rate while scanning electron
microscopy (SEM) and X-Ray diffraction (XRD) were used to study the carbon steel
morphology and phase analysis. Using low magnification digital camera, the type of corrosion
that took place on the carbon steel surface was identified.