11377 Effect of Water Content on the Corrosion Behavior of Carbon Steel in Supercritical CO2 Phase

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Product Number: 51300-11377-SG

ISBN: 11377 2011 CP

Author: Yoon-Seok Choi and Srdjan Nesic

Publication Date: 2011

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Sufficient drying (water removal) of carbon dioxide (CO2) in transport pipelines is required to prevent breaking-out of free water and consequent excessive corrosion rates. The drying requirement for CO2 pipelines, used for enhanced oil recovery (EOR) in the United States, is a maximum of 650 ppm (mole) of water. However, there is a possibility of increased corrosion rates in supercritical CO2 phase with water vapor (below its solubility level) in the presence of oxygen (O2) and sulfur dioxide (SO2). Thus, the objective of the present study is to evaluate the corrosion properties of carbon steel in supercritical CO2/O2/SO2 mixtures with different amounts of water (under-saturated) related to the transmission of CO2 to sequestration sites. The corrosion property of carbon steel was evaluated by using an autoclave operating at different pressures (maximum 2000 psi), temperatures (maximum 50oC), and concentrations of O2 and SO2 impurities as well as water content. The corrosion rate of samples was determined by weight loss measurements. The surface morphology and the composition of the corrosion product layers were analyzed using surface analytical techniques (scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD)).

Key words: Supercritical CO2, CO2 corrosion, H2O, O2, SO2, carbon steel, carbon capture and storage