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TitleIn situ synchrotron X-ray diffraction study of surface scale formation during CO2 corrosion of carbon steel at temperatures up to 90 °C
Publication TypeJournal Article
Year of Publication2010
AuthorsIngham, B., Ko M., Kear G., Kappen P., Laycock N., Kimpton J.A., and Williams D.E.
JournalCorrosion Science
Pagination3052 - 3061
Date Published2010
ISSN0010938X (ISSN)
KeywordsAnodic currents, B. X-ray diffraction, Carbon steel, Corrosion, Corrosion inhibitors, Corrosion process, Corrosion product scale, Crystallite size, In-situ synchrotrons, Iron ores, Organic acids, Phosphonic acids, Saturated brines, Scale (deposits), Scale formation, Scale inhibitor, Scale thickness, Surface scale, Synchrotron radiation, Synchrotrons, Trimethylene, X ray diffraction, X rays
AbstractIn situ synchrotron X-ray diffraction was used to follow the formation of corrosion product scales on carbon steel in CO2 saturated brine at temperatures from 40 to 90 °C. The corrosion process was accelerated by applying a small anodic current, and in selected tests a scale inhibitor, amino trimethylene phosphonic acid (ATMPA), was added. Siderite was identified as the major phase in the scale formed in all conditions. With increasing temperature, the scale formation rate increased, while the scale thickness and crystallite size decreased. Above 60 °C, the scale became increasingly protective. The scale thickness and crystallite size decreased with increasing ATMPA concentration. © 2010 Elsevier Ltd. All rights reserved.

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