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首页> 外文期刊>Geosciences >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
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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

机译：基于同步加速器的Micro-CT研究潜在用在深层核废料核燃料库中的铜包碳钢的氧腐蚀

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摘要

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 O 2 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 O 2 used to drive steel corrosion. The results demonstrate that the availability of O 2 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.
机译：在提议永久处置用过的核燃料的多屏障系统中，主要的工程屏障是密封的金属容器。当前加拿大的容器设计利用涂覆有铜的碳钢容器进行腐蚀保护。如果暴露出钢基材的铜涂层出现缺陷，原则上可能会发生电加速腐蚀。在这项工作中，使用电化学测量方法监测了包含溶解的O 2的3.0 mol / L NaCl溶液中模拟涂层穿透缺陷的腐蚀进程，并使用同步加速器X射线微计算机断层扫描（micro-CT）无损成像。根据3D micro-CT数据测量模拟缺陷基础处的损伤量，并用于计算用于驱动钢腐蚀的O 2量。结果表明，O 2的可用性决定了腐蚀的速率和整体程度，而使用不同的沉积和处理方法（冷喷涂沉积，热处理的冷喷涂沉积，电沉积）生产的涂层会导致不同的腐蚀传播几何形状，损伤的分布取决于铜/钢界面的质量。

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