[en] Full text: Metallic corrosion is frequent and occurs in various industrial activities. The corrosion resistance is decreased when metallic materials or alloys are exposed to environment containing chloride or moisture. Hybrid materials have been used as an alternative corrosion protection due to their excellent anti-corrosion performance and great potential as protective coating of metallic surfaces [1]. In this work, Siloxane-poly(methyl methacrylate) (PMMA) hybrid coatings were prepared by sol-gel process from copolymerization of methyl methacrylate (MMA) and 3-methacryloxypropyltrimethoxysilane (MPTS) followed by acid-catalyzed hydrolysis of tetraethoxysilane (TEOS) and the influence of the addition of molybdenum (VI) ions on the anticorrosion properties of coatings applied to aluminum alloy (AA6063T5) was investigated. Structural features of the hybrid materials were studied by ¹³C and ²⁹Si nuclear magnetic resonance (NMR), small Angle X-Ray Scattering (SAXS), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TG). The surface morphology of doped and undoped coatings and corrosion resistance were evaluated by scanning electron microscopy (SEM) and electrochemical measurements (Open Circuit Potential-OCP and potentiodynamic polarization curves), respectively. The results are discussed based on correlation of structural and anticorrosive properties and showed the influence of molybdenum ions addition on the structural characteristics and suggested an improvement in the corrosion resistance of hybrid coatings on the aluminum alloy. Reference: [1] P. Hammer, F. C. dos Santos, B. M. Cerrutti, S. H. Pulcinelli. C. V. Santilli, J Sol-Gel Sci Technol (2012). (author)