10195 Corrosion Behavior of Different Metallic Materials Under Supercritical Carbon Dioxide at 550°C and 250 Bars

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Product Number: 51300-10195-SG

ISBN: 10195 2010 CP

Author: Fabien Rouillard, Frederic Charton and Gervaise Moine

Publication Date: 2010

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In the framework of a new generation of nuclear reactors, typically Sodium Fast Reactors, supercritical carbon dioxide with a Brayton cycle (at 550°C and 250 bars) is identified as a promising energy conversion system to replace the traditional steam generators. Nevertheless, the long-term integrity of the heat exchanger structure in this environment has to be proven over at least 20 years. For this reason, the corrosion behavior of the following metallic materials in static carbon dioxide at 550°C and 250 bars was studied: 9wt% Cr ferritic-martensitic steel (T91) and austenitic alloys, 316L, 800H, and S30815. The first results about the nature of the corrosion product, and their morphology and kinetics of formation revealed through surface analyses such as Glow Discharge Optical Emission Spectroscopy, Scanning Electron Microscopy, Wavelength-Dispersive Spectroscopy and X-Ray Diffraction are presented. Corrosion mechanisms for the various steels are proposed and the most promising materials for heat exchanger applications revealed.

Keywords: supercritical carbon dioxide, oxidation, carburization, ferritic-martensitic steel, austenitic steel