Sayısal modelleme ve deneysel değerlendirme ile alüminyum alaşım AA2024-T3 ve karbon elyaf güçlendirilmiş plasti arasında galvanik korozyon tayini

During the aircraft development process, corrosion acceleration tests are often performed to assess the risk of corrosion of designs when exposed to the outdoor environment for an extended period or to simulate the actual situation the aircraft structure will be exposed to during its life. However, these tests require several months to years to complete. As an alternative approach, computational modeling has the potential to reduce the cost of testing significantly. A calculation model was developed, and experimental validation was performed to simulate galvanic corrosion in the environment to which the aircraft will be exposed to. The numerical approach was based on a 2D boundary/finite element method. The inputs of the problem were the geometric definition and physical properties of the electrolyte and the macroscopic polarization curves of the active electrodes. The main results of the model were corrosion rates, current density, and potential distribution. An experimental setup was established for the validation of the calculation results consisting of a combination of two common planar materials consisting of aluminum AA2024-T3 and carbon fiber reinforced polymer (CFRP). The validation approach is explained, and the critical pit corrosion distance due to galvanic corrosion on the aluminum alloy and the maximum pit corrosion depth is shown. A reasonably good agreement was reached between the observed and simulated data.