Journal
CORROSION SCIENCE
Volume 90, Issue -, Pages 192-201Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2014.10.010
Keywords
Low alloy steel; Carbon steel; X-ray diffraction; Potentiostatic
Funding
- New Zealand Ministry of Business, Innovation and Employment [C08X1003]
- New Zealand Ministry of Business, Innovation & Employment (MBIE) [C08X1003] Funding Source: New Zealand Ministry of Business, Innovation & Employment (MBIE)
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This study demonstrates that the nucleation of crystalline scales of siderite and chukanovite onto the surface of low-alloy steels under CO2 corrosion at elevated temperature is critically dependent on initial surface roughness, on microstructure-related surface roughness developed during corrosion, and on stirring in the solution. This study confirms that effects due to chromium micro-alloying in the steel are extremely important for siderite nucleation. On average, these effects dominate over the effects of microstructure. However, spatial variation of the corrosion deposit thickness indicates an interdependence between microstructure and chromium-enhanced siderite nucleation with the possibility of localised corrosion developing as a result. (C) 2014 Elsevier Ltd. All rights reserved.
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