Performance Analysis and Characterization of a Fiber/Epoxy Composite in a Simulated Hygrothermal Corrosion Environment

LI Jinxuan; XUE Yawei; SUN Chenglong; WU Bin; SUN Dehai; WU Nana; KONG Guangming

doi:10.7643/ issn.1672-9242.2025.12.015

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (12) : 118-124. DOI: 10.7643/ issn.1672-9242.2025.12.015

Environmental Test and Observation

Performance Analysis and Characterization of a Fiber/Epoxy Composite in a Simulated Hygrothermal Corrosion Environment

LI Jinxuan¹, XUE Yawei², SUN Chenglong³, WU Bin⁴, SUN Dehai⁴, WU Nana⁵, KONG Guangming⁴

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Abstract

The work aims to reveal the correlation mechanism between the microstructural evolution and the electromagnetic wave absorption performance of fiber/epoxy composites during corrosion in a hot and humid tropical marine environment, providing a theoretical basis for the design of high-environmental-adaptability wave-absorbing materials and the prediction of their service life. A periodic immersion accelerated corrosion test was used to simulate the target environment. Multi-scale morphological characterization and reflectivity testing via the arch measurement method were combined to systematically analyze changes in the microstructure and wave absorption performance of the material before and after corrosion. Quantitative statistics, such as pit diameter distribution and surface roughness variation, along with frequency-band separation analysis, were employed to decipher the effect mechanism of corrosion on wave absorption behavior across different frequency bands. Corrosion led to significant alterations in the surface morphology and component distribution of the material, resulting in frequency-dependent evolution of the wave absorption performance. In the 8-12 GHz frequency band, the heterogeneous interfaces formed by corrosion products enhanced interfacial polarization loss, reducing the reflection loss (RL) by 0.5-2 dB and improving the wave absorption efficiency by 10%-20%. In the 12-18 GHz frequency band, pits with an average diameter of 5-8 µm on the fiber surface damaged interface integrity, causing an increase in RL by 1-3 dB and a decrease in wave absorption efficiency by 20%-30%. Analysis indicated that the increased surface roughness and the deposition of corrosion products benefited impedance matching and electromagnetic wave scattering in the mid-frequency range, thereby enhancing mid-frequency absorption. The degradation of high-frequency performance was attributed to corrosion damage at the fiber-resin interface and the deterioration of electrical properties. A competitive loss mechanism is proposed, that is "corrosion products enhance interfacial polarization to promote mid-frequency absorption, while interface damage and electrical degradation weaken high-frequency absorption". This study reveals the intrinsic relationship between "corrosion-structure-performance" in composites under hot-humid marine environment, providing crucial insights for the environmental adaptability assessment, design optimization, and service life prediction of wave absorbing composite materials

Key words

composites / multi-scale morphological characterization / hot-humid marine environment / arch measurement method for reflectivity / reflection loss / periodic wet-dry accelerated corrosion

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LI Jinxuan, XUE Yawei, SUN Chenglong, WU Bin, SUN Dehai, WU Nana, KONG Guangming. Performance Analysis and Characterization of a Fiber/Epoxy Composite in a Simulated Hygrothermal Corrosion Environment[J]. Equipment Environmental Engineering. 2025, 22(12): 118-124 https://doi.org/10.7643/ issn.1672-9242.2025.12.015

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