Journal
CORROSION SCIENCE
Volume 52, Issue 9, Pages 3052-3061Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2010.05.025
Keywords
X-ray diffraction; Steel
Funding
- New Zealand Foundation for Research Science and Technology [CO8X0419]
- New Zealand Synchrotron Group Ltd
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In 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 degrees 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 degrees C, the scale became increasingly protective. The scale thickness and crystallite size decreased with increasing ATMPA concentration. (C) 2010 Elsevier Ltd. All rights reserved.
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