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Aircraft aluminum alloy is easy to initiate pitting corrosion in the airport environment, and the pitting corrosion topography characteristics could directly affect the fatigue mechanical property of aluminum alloy structure. In order to obtain the pitting corrosion characteristics of 7B04 aluminum alloy in the airport environment, the pitting corrosion test was carried out according to the accelerated corrosion environment spectrum which simulated the airport environment, and the corrosion damage parameters were defined, including corrosion pit depth H , corrosion pit surface length L and the corrosion pit surface width W . During the corrosion test process, the three parameters of typical corrosion pits were successively measured in different corrosion period to obtain the corrosion pit damage size data, then the data was statistically analysed and used to compute the fractal dimension of corrosion damage based on the fractal theory by which to gain the pitting corrosion damage characteristics and its evolvement rules during pitting corrosion process. The computation results show that the corrosion pit damage clearly appears fractal characteristics and the fractal dimension of corrosion pit gradually increases with corrosion time prolongation, which suggests that the corrosion pit damage trends to be shallow and long and moderate wide topography character in the later corrosion period.

Pitting Corrosion Morphology Characteristics of 7B04 Aluminum Alloys In Airport Environment Based on Fractal Theory