| Full text | |
| Author(s): |
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
Total Authors: 9
|
| Document type: | Journal article |
| Source: | MATERIALS; v. 18, n. 5, p. 18-pg., 2025-03-01. |
| Abstract | |
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) | |
| FAPESP's process: | 24/03148-3 - Biofunctionalization of biomedical Ti-based alloys using micro-arc oxidation and the concept of high entropy oxides |
| Grantee: | Diego Rafael Nespeque Correa |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 21/13921-3 - Development of a low cost high entropy alloy for potential use as bone fixation devices |
| Grantee: | Jhuliene Elen Muro Torrento |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 18/24931-7 - Development of a novel high entropy alloy based on TiZrNbTaMn for potential biomedical application |
| Grantee: | Jhuliene Elen Muro Torrento |
| Support Opportunities: | Scholarships in Brazil - Master |