Corrosion Testing and Simulation of Key Components in Helicopter Connecting Structures

LI Jian; WU Yunzhang; WANG Qianxu; SHEN Jun; WANG Yanbing

doi:10.7643/ issn.1672-9242.2025.11.005

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (11) : 49-58. DOI: 10.7643/ issn.1672-9242.2025.11.005

Aviation and Aerospace Equipment

Corrosion Testing and Simulation of Key Components in Helicopter Connecting Structures

LI Jian¹, WU Yunzhang¹, WANG Qianxu^1,*, SHEN Jun¹, WANG Yanbing²

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Abstract

The work aims to predict the development of corrosion damage and evaluate the calendar life of key components of helicopter structures through corrosion simulation tests. For key components of a certain type of helicopter structures, a three-dimensional physical model was established based on the structural form, material, and size conditions. Typical environmental conditions were selected for simulation calculations, and the simulation model was verified using actual corrosion damage data of the helicopter, corrosion damage data of natural exposure specimens, and data from laboratory environmental accelerated tests. The corrosion rate of 2A12 after surface anodizing treatment was 1/32 of that of the bare material, while the corrosion rate of 40CrNiMoA after cadmium plating treatment became 1/10 of that of the bare material. Different surface treatment processes of metals played a protective role to varying degrees for the bare material. When the damage tolerance of the bolt hole and the bolt was 0.15 mm and 0.2 mm, respectively, the bolt hole could support for 1.39 years, and the bolt could support for 1.23 years. The corrosion simulation results were basically consistent with the results of the corrosion accelerated test, verifying the effectiveness of the corrosion simulation model and laying a foundation for the simulation means of calendar life prediction of vehicle structure key components. In conclusion,taking the corrosion damage tolerance of major overhauls as the standard, and taking no corrosion and limited corrosion damage (based on actual damage) as the initial conditions, simulation calculations are conducted to analyze the corrosion rate, predict the corrosion development trend, and evaluate the potential for calendar life extension.

Key words

helicopter / structural critical components / corrosion simulation / corrosion damage tolerance / corrosion rate / calendar life

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LI Jian, WU Yunzhang, WANG Qianxu, SHEN Jun, WANG Yanbing. Corrosion Testing and Simulation of Key Components in Helicopter Connecting Structures[J]. Equipment Environmental Engineering. 2025, 22(11): 49-58 https://doi.org/10.7643/ issn.1672-9242.2025.11.005

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