Research on the Corrosion Damage of K8E Aircraft Structure Based on Environment
|School||Nanchang University of Aeronautics and|
|Keywords||corrosion damage environmental spectrum aluminum alloy coatings grade evaluation|
Under the influence of a certain environment, the effects of corrosion on the aircraftstructures have become increasingly prominent along with the aircraft service life, andcorrosion damage has become one of the most important factor seriously affecting thesafe use and maintenance of aircrafts. Therefore, it is urgently requisite to do the researchbetween the aircraft’s service environment and the corrosion damage of aircraft structurein service environment. In this paper, based on the service environment of K8E aircraft,the service environmental spectrum and accelerated corrosion test spectrum wereestablished, the coating corrosion failure behavior of aircraft structure simulationspecimens after accelerated corrosion test was analyzed, and the corrosion grades wereevaluated, the developing law of corrosion damage of specimen substrate waspredicted.The main researches are as follows:(1) According to the environmental monitoring datas of aircraft’s service airport, theenvironment database was established. Through the analysis on the meteorological andchemical environmental datas, the meteorological environmental spectrum and chemicalenvironmental spectrum were established respectively, and thus the airport groundcorrosion environmental spectrum was established.(2) Based on Faraday’s law and the equivalent quantization rule of corrosiondamage, the equivalent conversion coefficients of aluminum alloy for aircraft structuresunder different temperature and humidity conditions and that of corrosive media andwater were used to establish the equivalent accelerated corrosion environmentalspectrum of exposed aluminum alloy structural of aircrafts, and the aircraft skinsimulation specimens were prepared for accelerated corrosion test.(3) The development of corrosion failure of aircraft skin surface coatings wasanalyzed, and corrosion rate prediction model was established. According to coatingcorrosion damage evaluation standards, corrosion damages of different coating systemsof specimens were evaluated comprehensively based on grey relational theory, and theprotecting performances of different coatings were analysed.(4) By measuring the maximum corrosion depth of aircraft specimens at differentcorrosion time, statistical analysis method and time seial model were both used toestablish a forecasting model for corrosion damage, which was used to predict thechange rules of the maximum corrosion depth of the substrate along with the aircraftsevice time.