Corrosion resistance and material optimization in supercritical water oxidation for radioactive waste treatment

IF 3.2 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Nuclear Materials Pub Date : 2025-07-26 DOI:10.1016/j.jnucmat.2025.156063

Xinyue Huang, Shuzhong Wang, Yanhui Li, Shenghan Sun, Zhaoxia Mi, Limei Xing, Yuanwang Duan

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Abstract

This study addresses the severe corrosion of materials during the supercritical water oxidation (SCWO) treatment of tributyl phosphate (TBP), a key radioactive organic solvent. The corrosion behavior of SS316, Incoloy 800, Incoloy 825, and Inconel 625 was evaluated under oxygen-free, oxidizing, and alkaline conditions in subcritical and supercritical water. Results showed that SS316, although cost-effective, undergoes rapid degradation in oxidizing environments, with a corrosion rate of 1.6 mm/a. In contrast, Inconel 625 maintained excellent corrosion resistance at 0.46 mm/a due to the formation of stable NiCr₂O₄ and Cr₂O₃ oxide layers. Notably, this study demonstrates that phosphate anions derived from TBP decomposition can enhance alloy passivation by forming protective phosphate films. Additionally, alkaline modulation using 1 wt.% sodium hydroxide was shown to reduce corrosion rates across all tested alloys significantly. By coupling corrosion environment control with tailored material selection, a corrosion-resistant SCWO reactor was developed, whose innovative structural design also enhances nuclide separation efficiency, offering valuable engineering insights for SCWO systems.

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超临界水氧化处理放射性废物的耐腐蚀性能及材料优化

研究了超临界水氧化（SCWO）处理磷酸三丁酯（TBP）过程中材料的严重腐蚀问题，这是一种重要的放射性有机溶剂。研究了SS316、incoly 800、incoly 825和Inconel 625在亚临界和超临界水中的无氧、氧化和碱性条件下的腐蚀行为。结果表明，SS316虽然具有成本效益，但在氧化环境中会迅速降解，腐蚀速率为1.6 mm/a。相比之下，由于形成稳定的NiCr₂O₄和Cr₂O₃氧化物层，Inconel 625在0.46 mm/a的速度下保持了优异的耐腐蚀性。值得注意的是，本研究表明，由TBP分解产生的磷酸盐阴离子可以通过形成保护性磷酸盐膜来增强合金的钝化。此外，使用1 wt.%的氢氧化钠进行碱性调制，可以显著降低所有测试合金的腐蚀速率。通过将腐蚀环境控制与定制材料选择相结合，开发了一种耐腐蚀的SCWO反应器，其创新的结构设计还提高了核素分离效率，为SCWO系统提供了有价值的工程见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Nuclear Materials 工程技术-材料科学：综合

CiteScore

5.70

自引率

25.80%

发文量

601

审稿时长

63 days

期刊介绍： The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome. The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example. Topics covered by JNM Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior. Materials aspects of the entire fuel cycle. Materials aspects of the actinides and their compounds. Performance of nuclear waste materials; materials aspects of the immobilization of wastes. Fusion reactor materials, including first walls, blankets, insulators and magnets. Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties. Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.