Corrosion Mechanism of GH4169 Alloy in Simulated Shipboard Platform Environment

JIA Runchuan; LIU Zemeng; LI Ming; CHEN Yu; CUI Tengfei; WU Jianguo

doi:10.7643/issn.1672-9242.2025.08.005

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (8) : 38-44. DOI: 10.7643/issn.1672-9242.2025.08.005

Special Topic—Application and Collaborative Evaluation Technology of Light Weapons in Complex Environments

Corrosion Mechanism of GH4169 Alloy in Simulated Shipboard Platform Environment

JIA Runchuan^1,2, LIU Zemeng^1,2, LI Ming^1,2, CHEN Yu^1,2, CUI Tengfei³, WU Jianguo³

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Abstract

The work aims to investigate the corrosion damage mechanisms and influencing factors of GH4169 alloy under simulated shipboard environments. Salt spray/SO₂ composite tests were conducted on samples subject to two distinct heat treatment regimes. Micro-corrosion morphologies were characterized via scanning electron microscopy (SEM). Results revealed that under salt spray/SO₂ conditions, two GH4169 samples exhibited delayed corrosion initiation compared with common metals, but ultimately succumbed to corrosion, which produced green corrosion products. Samples with higher δ-phase content demonstrated earlier corrosion onset and progressively severe corrosion, characterized by increased pit density, larger pit dimensions, and greater depths, indicating exacerbated overall corrosion. These findings underscore the alloy's robust corrosion resistance in shipboard environments. Variations in corrosion behavior during testing are primarily attributed to heat treatment-induced differences in δ-phase content and distribution, with higher δ-phase fractions correlating with increased corrosion susceptibility.

Key words

high-temperature alloy / salt spray/SO₂ composite test / shipboard platform environment / accelerated corrosion / δ-phase / corrosion mechanism

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JIA Runchuan, LIU Zemeng, LI Ming, CHEN Yu, CUI Tengfei, WU Jianguo. Corrosion Mechanism of GH4169 Alloy in Simulated Shipboard Platform Environment[J]. Equipment Environmental Engineering. 2025, 22(8): 38-44 https://doi.org/10.7643/issn.1672-9242.2025.08.005

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