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The primary purpose of this study is to investigate the effect of the electrochemical parameters required in the anodic oxidation process on the friction and wear resistance of the obtained nanoporous aluminum oxide films. The wear resistance of the aluminum oxide films and the electrochemically polished Al1050 alloy were tested using a ball-on-disc tribometer having a corundum ball as counterbody in dry conditions. The friction coefficient graphs were recorded during wear tests at a 5 N normal force simulating the application of nanoporous aluminum oxide films in industrial areas requesting moderate wear resistance. The wear tracks formed on the tested surfaces were analyzed ex situ both qualitatively and quantitatively. Higher wear resistance is showed by nanoporous aluminum oxide films as compared with electro polished Al1050 alloy substrate. Fig. 2 SEM surface morphology of: (a) electrochemically polished Al1050 alloy; (b) nanoporous Al 2 O 3 film formed at 15 V imposed potential; (c) nanoporous Al 2 O 3 film formed at 18 V imposed potential and (d) nanoporous Al 2 O 3 film formed at 21 V imposed.

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This research work investigates the influence of anodic oxide film obtained in sulphuric electrolyte on the corrosion behavior of 6061 aluminum alloy in natural sea water. Corrosion behavior of untreated and anodized 6061 aluminum alloy was studied using electrochemical methods such as: open circuit potential and electrochemical impedance spectroscopy. All the tests were performed in an aerate sea water with pH=7.63 at room temperature (25oC). The electrochemical results are in good agreement with optical microscopy images. The polarization resistance of aluminum oxide film increases as compared with the untreated aluminum alloy this showing an improving of corrosion resistance after anodic oxidation. These results demonstrate the advantages of the as-fabricated anodic oxide layer as a barrier thin film to marine corrosion.