Journal
CORROSION SCIENCE
Volume 50, Issue 9, Pages 2456-2464Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2008.06.031
Keywords
Carbon steel; EIS; CO2 corrosion; Steel microstructure; Imidazolines
Funding
- Argentine Research Council for Science and Technology (CONICET)
- TENARIS- SIDERCA
- University of Mar del Plata
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The importance of chemical composition and microstructure on CO2 corrosion of carbon and low alloy steels has been widely recognized, still contradictory results can be found in the literature. The aim of this work is to assess the relationship between microstructure, surface condition and inhibitor efficiency in CO2 corrosion. A C-Mn steel with two different microstructures was tested in a deoxygenated 5% wt. NaCl solution saturated with CO2 at 40 degrees C, pH 6. A commercial imidazoline-based inhibitor was added after different pre-corrosion periods. The results obtained showed that pre-corrosion decreases the inhibitor efficiency, but that its impact is microstructure dependent. (c) 2008 Elsevier Ltd. All rights reserved.
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