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Geosciences 2018, 8(10), 360; https://doi.org/10.3390/geosciences8100360

Synchrotron-Based Micro-CT Investigation of Oxic Corrosion of Copper-Coated Carbon Steel for Potential Use in a Deep Geological Repository for Used Nuclear Fuel

1
Department of Chemistry, the University of Western Ontario, London, ON N6A 5B7, Canada
2
Surface Science Western, the University of Western Ontario, London, ON N6G 0J3, Canada
3
Nuclear Waste Management Organization, Toronto, ON M4T 2S3, Canada
*
Author to whom correspondence should be addressed.
Received: 14 August 2018 / Revised: 17 September 2018 / Accepted: 20 September 2018 / Published: 26 September 2018
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Abstract

Within the multi-barrier system proposed for the permanent disposal of used nuclear fuel, the primary engineered barrier is the sealed metallic container. The present Canadian container design utilizes a carbon steel vessel coated with Cu for corrosion protection. In the event of a defect in the Cu coating that exposes the steel substrate, galvanically accelerated corrosion of steel is, in principle, possible. In this work, the progression of corrosion at a simulated through-coating defect in 3.0 mol/L NaCl solution containing dissolved O2 was monitored using electrochemical measurements and imaged non-destructively using synchrotron X-ray micro computed tomography (micro-CT). The damage volume at the base of the simulated defect was measured from the 3D micro-CT data and used to calculate the amount of O2 used to drive steel corrosion. The results demonstrate that the availability of O2 determines the rate and overall extent of corrosion, while the coatings produced using different deposition and treatment methods (cold spray deposition, heat-treated cold spray deposition, electrodeposition) lead to different corrosion propagation geometries, with the distribution of damage depending on the quality of the Cu/steel interface. View Full-Text
Keywords: copper; carbon steel; galvanic corrosion; micro-CT; X-ray tomography; cold spray; electrodeposition; electrochemistry; nuclear waste management copper; carbon steel; galvanic corrosion; micro-CT; X-ray tomography; cold spray; electrodeposition; electrochemistry; nuclear waste management
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Standish, T.E.; Zagidulin, D.; Ramamurthy, S.; Keech, P.G.; Shoesmith, D.W.; Noël, J.J. Synchrotron-Based Micro-CT Investigation of Oxic Corrosion of Copper-Coated Carbon Steel for Potential Use in a Deep Geological Repository for Used Nuclear Fuel. Geosciences 2018, 8, 360.

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