Corrosion Behavior of Key Materials in Firearm Automatic Mechanisms under Marine Corrosive Environment

GAO Yuan; HU Ming; HE Wei; LI Zhiteng; LI Zhiyuan; ZHANG Yanan

doi:10.7643/ issn.1672-9242.2026.01.002

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (1) : 9-16. DOI: 10.7643/ issn.1672-9242.2026.01.002

Weapons Equipment

Corrosion Behavior of Key Materials in Firearm Automatic Mechanisms under Marine Corrosive Environment

GAO Yuan¹, HU Ming^1*, HE Wei^2,3, LI Zhiteng¹, LI Zhiyuan¹, ZHANG Yanan¹

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Abstract

The work aims to investigate the corrosion behavior of key firearm automatic mechanism materials in marine corrosive environment and its impact on automatic component performance. Laboratory immersion corrosion tests were conducted and combined with corrosion weight loss analysis, electrochemical measurements, friction coefficient tests, and scanning electron microscopy observations, the corrosion weight loss, surface morphology evolution, electrochemical parameters, and friction coefficient variations of the samples were analyzed. With prolonged testing, the corrosion weight loss rate of the materials accelerated, and the surface morphology progressed from initial pitting and cracks to extensive peeling. The corrosion potential shifted negatively, the corrosion current density increased, and the substrate dissolution accelerated, indicating a decline in corrosion resistance. The friction coefficient increased, resulting in greater motion resistance. The results show that corrosion causes the surface to become increasingly rough, increases the resistance of the automatic mechanism components, and gradually leads to the loss of functionality.

Key words

automatic mechanism materials / 25Cr3Mo3NiNbZr steel / marine corrosion / corrosion kinetics / electrochemistry / corrosion mechanism

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GAO Yuan, HU Ming, HE Wei, LI Zhiteng, LI Zhiyuan, ZHANG Yanan. Corrosion Behavior of Key Materials in Firearm Automatic Mechanisms under Marine Corrosive Environment[J]. Equipment Environmental Engineering. 2026, 23(1): 9-16 https://doi.org/10.7643/ issn.1672-9242.2026.01.002

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Funding

; Fund：Doctoral Research Start-up Fund of Liaoning Province (2021-BS-162); Basic Scientific Research Project of Higher Education Institutions of Liaoning Province (LJKZ0273)