超高纯度316型奥氏体不锈钢在含氧饱和或低氧浓度铅铋共晶液中的腐蚀行为

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

Corrosion Science Pub Date : 2025-07-10 DOI:10.1016/j.corsci.2025.113173

Eriko Irisawa, Chiaki Kato

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引用次数: 0

摘要

研究了以晶界杂质偏析减少为特征的超高纯度316奥氏体不锈钢（316EHP）在铅铋共晶液（LBE）中530℃的腐蚀行为。研究评估了(1)316EHP在氧饱和LBE中的抗晶间氧化能力，(2)在低于磁铁矿平衡氧势的低氧浓度下的抗溶蚀能力。在含氧饱和的LBE中，316EHP形成了保护性的、均匀的氧化层，没有严重的颗粒内氧化。与传统316 L不锈钢相比，增强的Cr沿316EHP晶界扩散显著提高了其抗晶间氧化能力。然而，在低氧LBE中，316EHP表现出更高的溶解腐蚀敏感性，具有快速的晶间攻击和岛状铁素体颗粒的形成。本研究结果表明，通过添加Si等促进保护性氧化层形成的元素，比单纯增加SS中Cr的含量更有效地提高其抗晶间腐蚀能力。

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Corrosion behavior of extra-high-purity type 316 austenitic stainless steel in a liquid lead–bismuth eutectic with oxygen saturation or low oxygen concentrations

This study investigates the corrosion behavior of extra-high-purity 316 austenitic stainless steel (316EHP), characterized by reduced impurity segregation at grain boundaries, in liquid lead-bismuth eutectic (LBE) at 530°C. The research assesses (1) the resistance of 316EHP to intergranular oxidation in oxygen-saturated LBE, and (2) its dissolution corrosion resistance at low oxygen concentrations below the equilibrium oxygen potential of magnetite. In oxygen-saturated LBE, 316EHP formed protective, uniform oxide layers without severe intragranular oxidation. Compared with conventional 316 L stainless steel, enhanced Cr diffusion along 316EHP grain boundaries significantly improved resistance to intergranular oxidation. However, in low-oxygen LBE, 316EHP showed higher susceptibility to dissolution corrosion, with rapid intergranular attack and the formation of island-like ferritic particles. The results of this study suggest that it is more effective to increase the resistance to intergranular corrosion by adding elements such as Si, which promote the formation of protective oxide scales, than to simply increase the Cr content in SS.

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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.