Impact of salt purification and flow conditions on SS316H corrosion in molten NaF–KF–UF4

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-17 DOI:10.1016/j.corsci.2025.113325

Jaewoo Park, Jinsuo Zhang

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Abstract

Flow-accelerated corrosion of stainless steel 316H (SS316H) in NaF–KF–UF₄ salt (FUNaK) was investigated using a rotating cylinder system. Corrosion tests were conducted with FUNaK synthesized to contain varying levels of impurities and UF₃ concentrations to evaluate their influence on the corrosion behavior of SS316H. Different salt flow conditions were simulated by adjusting the rotational speed of the SS316H specimens to assess the influence of the flow condition on SS316H corrosion. Corrosion of SS316H in FUNaK with high oxygen concentrations led to the depletion of alloy constituents and salt penetration along grain boundaries, resulting in significant selective dissolution of the constituents into salt. Additionally, corrosion of SS316H was more severe under turbulent flow conditions compared to laminar flow. Within the turbulent flow regime, however, variations in flow condition of salt with high oxygen content showed limited impact on SS316H corrosion, likely due to the dominant influence of oxygen on corrosion and/or the formation of an iron-enriched surface layer.

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盐净化和流动条件对熔液中SS316H腐蚀的影响

采用旋转圆筒系统研究了不锈钢316H （SS316H）在naff - kf - uf4盐（FUNaK）中的流动加速腐蚀。用合成的FUNaK进行腐蚀试验，其中含有不同水平的杂质和UF3浓度，以评估它们对SS316H腐蚀行为的影响。通过调整SS316H试样的转速，模拟不同的盐流动条件，评估流动条件对SS316H腐蚀的影响。SS316H在高氧浓度的FUNaK中腐蚀导致合金成分耗竭和盐沿晶界渗透，导致成分选择性溶解到盐中。此外，与层流相比，湍流条件下SS316H的腐蚀更为严重。然而，在湍流状态下，高氧盐流动条件的变化对SS316H腐蚀的影响有限，这可能是由于氧对腐蚀和/或富铁表面层的形成的主要影响。

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

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.