ME - Artigos em revistas internacionais
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Browsing ME - Artigos em revistas internacionais by Subject "Aluminium"
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- Dielectric properties of Al-Nb amorphous mixed oxidesPublication . Di Franco, F.; Santamaria, M.; Di Quarto, F.; La Mantia, F.; de Sá, A.I.; Rangel, C. M.An impedance study of amorphous thin oxide films grown on sputtered Al-Nb alloys is presented. The characterization of the electronic properties of mixed amorphous oxide on the basis of the theory of amorphous semiconductor Schottky barrier has been carried out for anodic film on Al-92at.%Nb in a very detailed manner. The semiconductor to insulator transition of formed oxides as a function of the alloy composition at fixed final voltage has been supported by differential admittance study. A possible rationale for this transition has been suggested taking into account the changes of solid state properties, optical bandgap and electronic structure of the films, derived from the fitting of the differential admittance curves at different frequencies.
- Surface modification of 5083 aluminum-magnesium induced by marine microorganismsPublication . Jaume, Julien; Marques, Maria João; Délia, Marie-Line; Basseguy, RegineABSTRACT: The influence of microorganisms from a salt marsh in the surface modification of 5083 aluminum alloy (Al-Mg) in seawater was evaluated. An immersion test performed for 50 days in biotic and abiotic conditions, with electrochemical monitoring and surface/cross-section characterization by SEM/EDX and TEM after exposure, showed that microorganisms induced the formation of a homogenous layer on the Al-Mg surface. This layer, which proved to be composed of a doublestructure: a dense, amorphous inner layer and a more porous outer layer, was demonstrated to influence the corrosion resistance of the Al-Mg alloy in seawater.