Simulation and Experimental Verification of Localized Corrosion of an Aircraft Structure

An aircraft structural simulation was made using 7050 aluminum alloy, QAl104-4 copper alloy and Aermet100 structure steel. The polarization curves of the three materials were tested, and the Comsol finite element simulation model based on secondary current distribution was constructed with the interpolation function of the 7050/QAl10-4-4/Aermet100 polarization curve as boundary condition. The galvanic current and the coupling potential of three metal pairs were calculated and compared with the test results to debug the model, and the debugged model was applied to the analog parts of a certain type of aircraft structural parts. The results show that the model could reflect the location of corrosion and the sequence of corrosion occurrence better, which could lay a foundation for corrosion simulation prediction of complex structural parts and even the whole airplane.