Nowik Krzysztof, Zybała Rafał, Sztorch Bogna, Oksiuta Zbigniew
Institute of Mechanical Engineering, Faculty of Mechanical Engineering, Białystok University of Technology, Wiejska 45C, 15-351 Białystok, Poland.
Łukasiewicz Research Network-Institute of Microelectronics and Photonics, Al. Lotników 32/46, 02-668 Warsaw, Poland.
Materials (Basel). 2024 Jul 12;17(14):3466. doi: 10.3390/ma17143466.
This paper presents corrosion resistance results of a 12Cr ferritic ODS steel (Fe-12Cr-2W-0.5Zr-0.3YO) fabricated via a powder metallurgy route as a prospective applicant for fuel cladding materials. In a spent nuclear fuel reprocessing facility, nitric acid serves as the primary solvent in the PUREX method. Therefore, fundamental immersion and electrochemical tests were conducted in various nitric acid solutions to evaluate corrosion degradation behavior. Additionally, polarization tests were also performed in 0.61 M of sodium chloride solutions (seawater-like atmosphere) as a more general, all-purpose procedure that produces valid comparisons for most metal alloys. For comparison, martensitic X46Cr13 steel was also examined under the same conditions. In general, the corrosion resistance of the 12Cr ODS steel was better than its martensitic counterpart despite a lower nominal chromium content. Potentiodynamic polarization plots exhibited a lower corrosion current and higher breakdown potentials in chloride solution in the case of the ODS steel. It was found that the corrosion rate during immersion tests was exceptionally high in diluted (0.1-3 M) boiling nitric acid media, followed by its sharp decrease in more concentrated solutions (>4 M). The results of the polarization plots also exhibited a shift toward more noble corrosion potential as the concentrations increased from 1 M to 4 M of HNO. The results on corrosion resistance were supported by LSCM and SEM observations of surface topology and corrosion products.
本文介绍了一种通过粉末冶金路线制备的12Cr铁素体氧化物弥散强化钢（Fe-12Cr-2W-0.5Zr-0.3YO）的耐腐蚀性能结果，该钢作为燃料包壳材料的潜在候选材料。在乏核燃料后处理设施中，硝酸是普雷克斯法中的主要溶剂。因此，在各种硝酸溶液中进行了基本的浸泡和电化学测试，以评估腐蚀降解行为。此外，还在0.61 M的氯化钠溶液（类似海水的气氛）中进行了极化测试，作为一种更通用的通用程序，可为大多数金属合金提供有效的比较。为了进行比较，还在相同条件下研究了马氏体X46Cr13钢。总体而言，尽管名义铬含量较低，但12Cr氧化物弥散强化钢的耐腐蚀性优于其马氏体对应物。在氧化物弥散强化钢的情况下，动电位极化曲线在氯化物溶液中显示出较低的腐蚀电流和较高的击穿电位。发现在稀释的（0.1 - 3 M）沸腾硝酸介质中浸泡测试期间的腐蚀速率异常高，随后在更浓的溶液（>4 M）中急剧下降。随着硝酸浓度从1 M增加到4 M，极化曲线结果也显示出向更高贵的腐蚀电位的偏移。耐腐蚀性能的结果得到了表面拓扑结构和腐蚀产物的激光扫描共聚焦显微镜（LSCM）和扫描电子显微镜（SEM）观察结果的支持。
