Nanostructured oxide composites in PEO coating of β Ti alloys with low elastic modulus for biomedical applications

Author(s)

Rossi, Mariana C. ; Kuroda, Pedro A. B. ; Escuder, Angel Vicente ; Amigo, Vicente ; Afonso, Conrado R. M.

• Document type: Journal article
• Source: TRIBOLOGY INTERNATIONAL; v. 209, p. 14-pg., 2025-09-01.

Abstract

In this work, tribocorrosion of Ti-15Nb, Ti-40Nb, and Ti-33Nb-33Zr biomedical alloys in artificially simulated body fluid is studied by a tribocorrosion technique that allows measuring resistance to corrosion and wear at the same time for alloys coated by PEO technique using a bioactive solution for incorporation calcium, phosphorus, and magnesium that promote the formation of a passive ceramic layer with porosity made by TiO2. The kinetics parameters were calculated by the taffel curves extrapolation, the coefficient of friction during the process and the morphology and type of wear before, and after PEO coating on the alloys. XRD, SEM, and TEM evaluated a previous structural and microstructural study of the ceramic layer. Tribocorrosion tests were performed using a reciprocating pin-on-disk tribometer under constant load, and a counterpart, Al2O3, were used against the alloys in contact pressure on the tribocorrosion mechanisms. Among the beta Ti-Nb-(Zr) alloys, an improved wear and corrosion resistance with lower damage was remarked for TN15, TN40, and TNZ33 alloys, with better results for TN40 (rp=9.8 mu m/year), followed by TN15(rp=15.1 mu m/year) and TNZ33(rp=15.5 mu m/year) PEO coated samples. The improvement of tribocorrosion resistance can be attributed to the presence of zirconium oxide (ZrO2) and rutile (TiO2), the thickness (TN40: 1.3 mu m; TNZ33:5.2 mu m; TN15: 6.7 mu m) and pore size (TN40: 2.64 mu m; TNZ33: 3.68 mu m; TN15: 3.09 mu m) of the PEO ceramic layer. (AU)

• FAPESP's process: 23/16836-2 - Multiuser Platform for obtaining Powders through Ultrasonic Atomization and 3D Printing of Titanium Alloys, multiprincipal and refractory for Biomedical and Advanced Applications.
• Grantee: Conrado Ramos Moreira Afonso
• Support Opportunities: Research Infrastructure Program - Small Medium Sized
• FAPESP's process: 21/03865-9 - Influence of surface modifications on bioactivity and (tribo) corrosion of beta Ti-Nb-(Zr) alloys with low elastic modulus for application as implant
• Grantee: Mariana Correa Rossi
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 19/26517-6 - Influence of the microstructure and phases on surface functionalization of beta Ti-25Ta-xZr- alloys system
• Grantee: Pedro Akira Bazaglia Kuroda
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/18293-8 - Titanium alloys: phase transformations and additive manufacturing applied to obtaining functionally graded materials
• Grantee: Rubens Caram Junior
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 23/04654-7 - Tribological and ion release study of low elastic modulus in beta Ti alloys modified by anodizing and MAO
• Grantee: Mariana Correa Rossi
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor