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In the present work, the microstructure of an aluminum alloy produced by recycling metal waste is analyzed. This analysis showed that in addition to the main phase consisting of the aluminum matrix and which represents between 80 and 90% of the material, there are numerous secondary phases consisting of fine eutectic particles, inclusion of silica and numerous structural defects. A hybrid organic/inorganic coating was developed on this aluminum substrate by sol-gel route and cured at temperatures between 100 and 200°C. The chemical characteristics of the coating were analyzed by Fourier-Transform Infrared Spectroscopy. The anticorrosion properties of the coating were studied in a 3.5% NaCl solution by the classical technique of potentiodynamic polarization and electrochemical impedance spectroscopy. [ABSTRACT FROM AUTHOR]