A method of atmospheric corrosion prediction for aircraft structure

作者：Chen, Yueliang; Huang, Hailiang^*; Zhang, Yong; Wang, Chenguang; Fan, Weijie

来源：Materials and Corrosion-werkstoffe Und Korrosion, 2019, 70(1): 79-90.

DOI：10.1002/maco.201810391

• atmospheric corrosion prediction
• corrosion depth distribution
• galvanic current
• shell current distribution
• thin electrolyte layer
• wet-dry cycle

A simulation prediction system, test pieces -> flat test pieces -> structural parts, for the atmospheric corrosion of aircraft is proposed to provide guidance for aircraft anti-corrosion material selection and outfield maintenance. Based on the shell current distribution, a COMSOL corrosion simulation prediction model was constructed and applied to three types of test parts. The correctness of simulation principle is verified by comparing the galvanic current of simulation and test on each electrode surface of multi-electrode system. Comparing the simulated potential distribution at 100 mu m electrolyte layer with the corrosion morphology after 12 wet-dry corrosion periods, it is found that simulation and test are in good agreement. It is also proved that the 100 mu m static liquid film can reflect the corrosion of this kind of wet-dry cycle. Comparing the corrosion depths of different periods at three different points and the simulated corrosion depth with time, it is found that the corrosion depth of the first four periods was larger than the simulated depth, which was less than the simulated value after four periods. The model was applied to the local structural parts of aircraft. Then, corrosion position and corrosion area were predicted. The results were compared with the accelerated test results to verify the accuracy of the model's prediction of structural parts. At the same time, the corrosion depth of the structural parts was also predicted.

• 出版日期2019-1