Journal
CORROSION SCIENCE
Volume 65, Issue -, Pages 397-404Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2012.08.045
Keywords
Low alloy steel; Mild steel; XPS; Acid corrosion; Passivity
Funding
- Postdoctoral Foundation of Shengli Petroleum Administrative Bureau
- Sinopec Science & Technology Project [P11023]
- National Key Technology RD Program [2012BAC24A04]
- Special Fund for Postdoctoral Innovative Projects of Shandong Province [20110 2005]
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The surface layers of two model steels after corrosion in simulated CO2-enhanced oil recovery brines were characterized by chemical analysis and ion release measurement. It was found that a thin double layer of FeCO3 and FeO was formed on 20-steel surface, which can act as an initial pseudo-passive layer; while for 3Cr-steel, a thick, incompact corrosion layer with graded structures was formed, triggering higher dissolution rate of steel surface until reaching critical thickness. The results reflect an underlying mechanism of surface structural changes during initial CO2 corrosion, which also gives indications for long-term corrosion performance. (C) 2012 Elsevier Ltd. All rights reserved.
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