Galvanized Steel Overhead Ground Wire Corrosion Mechanism and Spectral Detection

DENG Shanquan; ZHU Junwei; ZHANG Xingsen; BIAN Meihua; CHEN Heng; HE Yuyin; JI Shuolei

doi:10.7643/ issn.1672-9242.2025.12.012

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (12) : 94-102. DOI: 10.7643/ issn.1672-9242.2025.12.012

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Galvanized Steel Overhead Ground Wire Corrosion Mechanism and Spectral Detection

DENG Shanquan, ZHU Junwei, ZHANG Xingsen, BIAN Meihua, CHEN Heng, HE Yuyin, JI Shuolei

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Abstract

The work aims to study the corrosion mechanism of the GJ-50 galvanized steel overhead ground wire in Guangxi when it is in service due to the synergistic effect of electrochemical corrosion and environmental medium. In this study, a neutral salt spray test (NSS) of 5wt.% NaCl and 25 ℃ was conducted to simulate the local high temperature, high humidity and high salt environment, and an accelerated corrosion test of the GJ-50 overhead ground wire was carried out for 20-960 h. Through weight loss test, surface morphology observation and reflectance spectrum analysis (350 nm-2 500 nm), the corrosion evolution law was systematically studied and analyzed. The results showed that the average weight loss in the corrosion weight loss test was 62.208 g/m² at 20 h, increased to 173.389 g/m² at 90 h, reached 442.085 g/m² at 360 h, increased to 534.324 g/m² at 960 h, and the weight loss rate with increasing salt spray time were 3.111, 1.926, 1.228 and 0.556 6 g/m²·h respectively. The macroscopic morphology showed that the corrosion process went through four stages: local corrosion of the galvanized layer, large-scale destruction of the galvanized layer, exposure of the steel matrix and corrosion of the steel matrix. The microscopic analysis confirmed that the protective effect of the zinc layer of salt spray at 960 h had completely failed, and the corrosion of the steel matrix was serious. From the EDS data, it was known that the zinc layer still existed in the sample when the salt spray time was 20 h and 90 h, while the zinc layer disappeared in the sample with the salt spray time of 360 h and 960 h, and iron oxide appeared. The following conclusions are drawn from this experiment. The corrosion weight loss increases monotonically with the extension of salt spray time, and the initial corrosion rate is significantly higher than that in the later stage, which is attributed to the barrier effect formed by the deposition of corrosion products. The corrosion law of the overhead ground wire was revealed by macroscopic morphology detection, and the microscopic morphology and spectral analysis were used to verify the corrosion law. This study reveals the corrosion dynamics and spectral response mechanism of galvanized steel strands, and provides a theoretical basis for the corrosion protection and service safety assessment of transmission lines in Guangxi.

Key words

galvanized steel / salt spray test / corrosion mechanism / protection failure / infrared spectroscopy detection / corrosion product correspondence

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DENG Shanquan, ZHU Junwei, ZHANG Xingsen, BIAN Meihua, CHEN Heng, HE Yuyin, JI Shuolei. Galvanized Steel Overhead Ground Wire Corrosion Mechanism and Spectral Detection[J]. Equipment Environmental Engineering. 2025, 22(12): 94-102 https://doi.org/10.7643/ issn.1672-9242.2025.12.012

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