F.R. Marciano
Federal University of Piauí,
Brazil
Keywords: surface treatments, TiO2, anodizing, magnetite, electrical conductivity
Summary:
Surface treatments in metal alloys are fundamental for modifying electrical conductivity, playing a crucial role in optimizing the performance of materials in various technological applications. These treatments, such as anodizing, electroplating, and thin-film deposition, significantly change the electrical properties of metal alloys, altering the surface resistance. Herein, different surface treatments are shown to modify the electrical conductivity of the alloys. Nanostructured TiO2 surfaces can be formed on titanium alloy surfaces by electrochemical anodizing. They feature layers of self-organizing nanostructures in tubular shape. The electrochemical passive system, provided by the oxide layer, increased the structural organization of the samples and promoted an increase in roughness, adhesion force and work function. The anodizing also improved the corrosion resistance in SBF medium. These processes can provide increased resistance to oxidation and corrosion, extending the life of components and maintaining electrical efficiency over time. On the other hand, magnetite nanoparticles can be incorporated into hydroxyapatite scaffolds to provide conductive properties. The addition of magnetite increased the amounts of Ca and P observed in the coatings. The electrical conductivity of the coatings significantly increases, and the impedance decreases with the addition of magnetite. These findings are particularly relevant to produce coatings, especially to orthopedic implants, since electrical conductivity can play a fundamental role in the interaction between the implant and the bone Then, different surface treatments are indispensable to improve the functionality and reliability of metal alloys in contexts where electrical conductivity is a fundamental factor for their application.