Stress-assisted Corrosion Behaviour of GH3535 Alloy in FLiNaK Molten Salt Environment

WANG Liang; KONG Deying; MA Qing

doi:10.7512/j.issn.1001-2303.2026.07.10

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Stress-assisted Corrosion Behaviour of GH3535 Alloy in FLiNaK Molten Salt Environment
Vol. 56, Issue 7, Pages: 81-87(2026)
Received：05 September 2025，

Revised：2025-10-20，

Published：20 July 2026
DOI： 10.7512/j.issn.1001-2303.2026.07.10
稿件说明：

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王亮，孔德英，马青.使役应力对GH3535合金在熔盐环境中腐蚀行为的影响［J］.电焊机，2026，56（7）：81-87. DOI： 10.7512/j.issn.1001-2303.2026.07.10.

WANG Liang, KONG Deying, MA Qing.Stress-assisted Corrosion Behaviour of GH3535 Alloy in FLiNaK Molten Salt Environment[J].Electric Welding Machine, 2026, 56(7): 81-87. DOI： 10.7512/j.issn.1001-2303.2026.07.10.

摘要

为评估服役应力对镍基高温合金熔盐腐蚀性能的影响，以GH3535合金为研究对象，采用四点弯曲加载装置施加348 MPa拉伸应力，在700 ℃ FLiNaK熔盐中进行240 h浸泡试验。通过失重测试、SEM/EPMA微观表征及ICP-OES熔盐成分分析，研究应力状态下合金的腐蚀动力学行为、组织演变特征及元素扩散规律。结果表明，加载试样的单位面积失重达5.21 mg/cm

，约为空载试样（1.29 mg/cm

）的4倍。空载试样以晶间腐蚀为主，晶界处腐蚀深度超过100 μm；施载后腐蚀形貌由沿晶溶解向晶内迁移转变，表层形成厚度逾100 μm的泡沫状腐蚀影响层，腐蚀前沿延伸至距表面300 μm以深。元素分布分析显示，晶界区域呈现贫Cr、贫Ni、富Mo的特征；腐蚀产物由保护性Cr

层转变为非保护性FeCr

尖晶石相。

Abstract

To evaluate the effect of service stress on the molten salt corrosion performance of nickel-based superalloys

GH3535 alloy was investigated using a four-point bending fixture applying 348 MPa tensile stress in FLiNaK molten salt at 700 ℃ for 240 h immersion tests. Through mass loss measurement

SEM/EPMA microstructural characterization

and ICP-OES molten salt composition analysis

the corrosion kinetics behavior

microstructural evolution characteristics

and elemental diffusion patterns of the alloy under stress conditions were examined.

Results

showed that the mass loss per unit area of the loaded specimen reached 5.21 mg/cm

approximately 4 times that of the unloaded specimen (1.29 mg/cm

). The unloaded specimen exhibited predominantly intergranular corrosion

with corrosion depth at grain boundaries exceeding 100 μm; after loading

the corrosion morphology transitioned from intergranular dissolution to grain interior migration

forming a foam-like corrosion-affected layer exceeding 100 μm in thickness on the surface

with the corrosion front extending to depths greater than 300 μm from the surface. Elemental distribution analysis revealed that the grain boundary region exhibited characteristics of Cr depletion

Ni depletion

and Mo enrichment; corrosion products transformed from

a protective Cr

layer to a non-protective FeCr

spinel phase. The research results can provide experimental basis for material selection and life prediction of key structural components in molten salt reactors.

关键词

Keywords

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