Effect of Bulk Phase Composition on the Growth of PEO Coatings on the Biomedical Ti-6Al-4V Alloy

Autor(es)

Neto, Jose Roberto Ferreira ; Ribeiro, Rafael Parra ; da Cruz, Nilson Cristino ; Rangel, Elidiane Cipriano ; Pinto, Bruna de Oliveira ; Torrento, Jhuliene Elen Muro ; Grandini, Carlos Roberto ; Kaneko, Ulisses Ferreira ; Correa, Diego Rafael Nespeque

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS; v. 18, n. 5, p. 18-pg., 2025-03-01.

Resumo

This study investigated the effects of plasma electrolytic oxidation (PEO) treatment in a Ca- and P-rich electrolyte on the surface of the Ti-6Al-4V alloy with distinct alpha/beta phase proportions previously induced by heat treatments. The results revealed that the alpha/beta phase proportions were successfully altered by the heat treatment temperatures, forming alpha phase plates surrounded by beta phase precipitates. PEO-treated samples exhibited a thick and microsized porous TiO2 coating in the anatase and rutile crystalline forms. The oxide layer was depleted by Al and V atoms, while Ca and P were gradually enriched along the coatings. Chemical analysis also indicated the absorption of water and organic molecules into the outer layer. PEO-treated samples had microscale roughness and thickness, hydrophilic behavior, and surface energy mainly formed by the dispersive component. The bulk's elastic modulus decreased with beta phase precipitation, while the alloying elements directly influenced the Vickers microhardness. The corrosion tests indicated a stable and protective layer in the PEO-treated samples, showing better corrosion resistance than untreated ones. Overall, the findings indicated that the alpha and beta phase proportion significantly impacts the mechanical properties, while the PEO treatment acts in the corrosion protection and surface aspects, suggesting that combining both approaches could be a powerful tool in biomedical applications. (AU)

• Processo FAPESP: 24/03148-3 - Biofuncionalização de ligas biomédicas de titânio usando oxidação por micro-arco e o conceito de óxidos de alta entropia
• Beneficiário: Diego Rafael Nespeque Correa
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 21/13921-3 - Desenvolvimento de uma liga de alta entropia de baixo custo para potencial aplicação como dispositivos de fixação óssea
• Beneficiário: Jhuliene Elen Muro Torrento
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/24931-7 - Desenvolvimento de uma nova liga de alta entropia à base de TiZrNbTaMn para potencial aplicação biomédica
• Beneficiário: Jhuliene Elen Muro Torrento
• Modalidade de apoio: Bolsas no Brasil - Mestrado