A Study Of Corrosion Behaviour Of Aircraft Components Material : Anodized Aluminium 2024-T3

Chang , Hin Fuat (2008) A Study Of Corrosion Behaviour Of Aircraft Components Material : Anodized Aluminium 2024-T3. Project Report. UTeM, Melaka,Malaysia. (Submitted)

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Abstract

This report presents a study on corrosion behaviour of aircraft components' material: anodized aluminium 2024-T3. Aluminium 2024-T3 is an aircraft material with high damage tolerance and it is normally used for aircraft fuselage and wings structure. However, the natural of Al 2024-T3 is very susceptible to many types of localized corrosion such as pitting corrosion, crevice corrosion and intergranular corrosion. Anodizing process is .a process where the bulk metal is corroded purposely using oxidizer to construct a protection layer that can prevent corrosion. In this study, the anodized aluminium 2024-T3 is prepared using chromic acid anodizing and hardcoat anodizing under controlled solution's temperature, concentration, times and current. Later, the prepared samples were studies using anodic polarization curve, Tafel plot (corrosion rate) and morphology analysis. Data such as critical corrosion potential of anodized Al 2024-T3 with their passivity can'be obtained and it is useful to characterize the corrosion behaviour the specimen. Meanwhile, the Tafel slope that been generated experimentally can used to calculate the corrosion rate of specimen. Lastly, through the SEM, the morphology of the corroded specimen is observed to determine what types of corrosion might be responsible for the deterioration of anodized Al 2024-T3. The result of this study had shown pitting corrosion and uniform corrosion on the specimens. This is further characterized with some metastable pitting and micropitting that commonly found in aluminium pitting process. As the C1- ion concentration increase, the specimens' Em, and Ebd had become more negative and more susceptible to corrosion. As conclusion, the Al 2024-T3 is very susceptible to pitting corrosion and it become more critical when the C1- ion in the environment increased. With anodizing process, the Al 2024-T3 aircraft components can increase its corrosion resistance and extend the service life of aircraft components about 25 years minimum.

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