A novel phosphorus segregation–driven chromium depletion mechanism for intergranular corrosion of inconel 625 in SCWO–HyMoS environments

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

Corrosion Science Pub Date : 2025-10-08 DOI:10.1016/j.corsci.2025.113397

Ke Li , Jiquan Chen , Guiyuan Xie , Xingying Tang , Donghai Xu , Jianqiao Yang

引用次数: 0

Abstract

This study investigated the intergranular corrosion (IGC) behavior of Inconel 625 sensitized at different temperatures (600–800°C) in supercritical water (SCW) environments containing phosphate-based hydrothermal molten salts (HyMoS). The results reveal that the IGC is driven by a dynamic chromium-depletion process induced by phosphorus segregation, which differs from the classical carbide-precipitation-induced chromium depletion theory. In addition, grain-boundary precipitates formed at 800 °C, such as MoNbP, further intensified the corrosion.

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一种新的磷偏析驱动的铬耗尽机制，用于铬镍铁合金625在SCWO-HyMoS环境中的晶间腐蚀

研究了不同温度（600 ~ 800℃）敏化后的Inconel 625在含有磷酸盐基水热熔盐（HyMoS）的超临界水（SCW）环境中的晶间腐蚀（IGC）行为。结果表明，IGC是由磷偏析引起的动态铬耗尽过程驱动的，这与经典的碳化物沉淀引起的铬耗尽理论不同。此外，在800℃时形成的晶界析出物（如MoNbP）进一步加剧了腐蚀。

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.