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Abstract
AbstractThe SEM, X‐ray diffraction (XRD), and XPS were employed to systematically characterize the component and microstructure of the corrosion scale formed on P110 steel exposed to carbon dioxide (CO2) environment. A loose and porous microstructure in corrosion scale was observed under turbulent flow condition for 120 h at 100 °C with a carbon dioxide partial pressure of 4 MPa in which the principal component was iron carbonate (FeCO3), whereas at 160 °C the corrosion scale was composed mainly of FeCO3 and a little amount of FeO(OH). In addition, complex carbonate (Mg,Fe)CO3 was produced because some Fe positions in FeCO3 lattice were substituted by Mg. It showed that a double‐layer structure of corrosion scale was observed at 160 °C compared with the result at 100 °C. Copyright © 2008 John Wiley & Sons, Ltd.
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