Callaghan Innovation Research Papers

Back to Research Papers

TitleIn situ synchrotron X-ray diffraction study of scale formation during CO 2 corrosion of carbon steel in sodium and magnesium chloride solutions
Publication TypeJournal Article
Year of Publication2012
AuthorsIngham, B., Ko M., Laycock N., Burnell J., Kappen P., Kimpton J.A., and Williams D.E.
JournalCorrosion Science
Pagination96 - 104
Date Published2012
ISSN0010938X (ISSN)
KeywordsAnodic dissolution, Carbon dioxide, Carbon steel, Corrosion, Corrosion products, Critical supersaturation, In-situ synchrotrons, Iron ores, Magnesium, Magnesium chloride solution, NaCl solution, Scale formation, Scanning electron microscopy, Sodium, Sodium chloride, Supersaturation, Surface scale, Synchrotron radiation, Synchrotrons, X ray diffraction
AbstractIn situ synchrotron X-ray diffraction was used to follow the formation of corrosion products on carbon steel in CO 2 saturated NaCl solution and mixed NaCl/magnesium chloride (MgCl 2) at 80°C. Siderite (FeCO 3) was the only phase formed in NaCl solution, while Fe(OH) 2CO 3 was also detected when MgCl 2 was present. The proposed model is that siderite precipitation, occurring once the critical supersaturation was exceeded within a defined boundary layer, caused local acidification which accelerated the anodic dissolution of iron. The current fell once a complete surface scale was formed. It is suggested that MgCl 2 addition decreased the required critical supersaturation for precipitation. © 2011 Elsevier Ltd.

Back to top