Abstract:

The corrosion depth of LY12CZ aluminum alloy was obtained by investigation in the service condition. A statistical study of corrosion characteristic quantity (CCQ) for these aluminum alloys was carried out. The results show that the corrosion depth is in conformity with Weibull distribution in given time. Corrosion depth (d_m) was fitted to Sigmoid function curve of the service time which included exposure to the environment and flying time. The period of validity of the anticorrosion layer is about 2.5 years in severe service environments.

Key words: aluminum alloy, localized corrosion, pitting corrosion, maximum corrosion depth, statisticalanalysis