Image analysis of periodic rain accelerated corrosion of aeronautical aluminium alloys

Periodic rain tests have been carried out for simulating atmospheric corrosion of aeronautical aluminium alloys. A digital image preprocessing and analysis method based on wavelet transformation was used to study the corrosion morphology of aluminium alloys samples, through which an image feature parameter δ was extracted and discussed. The influences of orthogonal experiment parameters on acceleration were analyzed according to image feature parameter δ with analysis of variance (ANOVA) method, and the optimal parameters for accelerated corrosion test were also obtained. The result was shown to be consistent with that from weight loss method.