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

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

doi:10.1016/j.corsci.2025.113397

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

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

School of Energy and Power Engineering

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

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.

Original language	English
Article number	113397
Journal	Corrosion Science
Volume	258
DOIs	https://doi.org/10.1016/j.corsci.2025.113397
State	Published - Jan 2026

Keywords

Hydrothermal molten salt corrosion
Inconel 625
Supercritical water oxidation

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10.1016/j.corsci.2025.113397

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

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.",

keywords = "Hydrothermal molten salt corrosion, Inconel 625, Supercritical water oxidation",

author = "Ke Li and Jiquan Chen and Guiyuan Xie and Xingying Tang and Donghai Xu and Jianqiao Yang",

note = "Publisher Copyright: {\textcopyright} 2025 Elsevier Ltd",

year = "2026",

month = jan,

doi = "10.1016/j.corsci.2025.113397",

language = "英语",

volume = "258",

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TY - JOUR

T1 - A novel phosphorus segregation–driven chromium depletion mechanism for intergranular corrosion of inconel 625 in SCWO–HyMoS environments

AU - Li, Ke

AU - Chen, Jiquan

AU - Xie, Guiyuan

AU - Tang, Xingying

AU - Xu, Donghai

AU - Yang, Jianqiao

PY - 2026/1

Y1 - 2026/1

N2 - 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.

AB - 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.

KW - Hydrothermal molten salt corrosion

KW - Inconel 625

KW - Supercritical water oxidation

UR - https://www.scopus.com/pages/publications/105018204722

U2 - 10.1016/j.corsci.2025.113397

DO - 10.1016/j.corsci.2025.113397

M3 - 文章

AN - SCOPUS:105018204722

SN - 0010-938X

VL - 258

JO - Corrosion Science

JF - Corrosion Science

M1 - 113397

ER -

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

Abstract

Keywords

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