Understanding corrosion behavior differences of Al-modified and Si-modified austenitic steels in lead-bismuth eutectic with 10−6 wt% oxygen at 600°C for up to 6000 h through multiscale characterization

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

Corrosion Science Pub Date : 2025-06-07 DOI:10.1016/j.corsci.2025.113099

Decang Zhang , Xiaoxin Zhang , Jun Zhang , Hao Ren , Feifei Zhang , Yingxue Chen , Qingzhi Yan

引用次数: 0

Abstract

Fe-17Ni-14Cr-3Al and Fe-17Ni-14Cr-3Si austenitic steels were exposed to liquid lead-bismuth eutectic (LBE) with 10⁻⁶ wt% oxygen at 600°C for up to 6000 h. Severe dissolution pitting occurred in Al-modified steel, while Si-modified steel showed no such damage. Both steels underwent breakaway oxidation, forming oxide scales with localized internal oxidation zones (IOZs) composed of Fe-Cr spinel and network of Ni&Fe-rich phase. The Ni&Fe-rich phase in the Al-modified steel was completely dissolved by LBE, forming penetration channels into the matrix that accelerated corrosion. In contrast, the IOZ in the Si-modified steel remained intact, effectively resisting LBE ingress and ensuring superior corrosion resistance.

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通过多尺度表征，了解al改性和si改性奥氏体钢在铅铋共晶中与10 - 6 wt%氧气在600°C、高达6000 h下的腐蚀行为差异

将Fe-17Ni-14Cr-3Al和Fe-17Ni-14Cr-3Si奥氏体钢暴露于含氧10 - 6 wt%的液态铅铋共晶（LBE）中，温度600℃，时间长达6000 h。al改性钢存在严重的溶解点蚀，而si改性钢没有这种损伤。两种钢均发生分离氧化，形成氧化层，内部氧化区（IOZs）由Fe-Cr尖晶石和富ni&fe相组成。铝改性钢中的富ni&fe相被LBE完全溶解，在基体中形成渗透通道，加速了腐蚀。相比之下，si改性钢的IOZ保持完整，有效地抵抗了LBE的进入，并确保了优异的耐腐蚀性。

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.

Understanding corrosion behavior differences of Al-modified and Si-modified austenitic steels in lead-bismuth eutectic with 10−6 wt% oxygen at 600°C for up to 6000 h through multiscale characterization

Abstract

Understanding corrosion behavior differences of Al-modified and Si-modified austenitic steels in lead-bismuth eutectic with 10−6 wt% oxygen at 600°C for up to 6000 h through multiscale characterization