Abstract

CAMERO, Sonia; OLIMPIO, Franlis; ROMERO, Dubravka  and  SYAREZ, Maribel. A corrosiveness Ti6Al4V alloy subjected to different surface treatments. Rev. Fac. Ing. UCV [online]. 2013, vol.28, n.3, pp.77-90. ISSN 0798-4065.

In this study the corrosion behavior in a Ti6Al4V alloy with mechanical surface treatment (grinding and polishing) and chemical (HNO₃, NaOH and H₂O₂/H₂SO₄) was evaluated in a simulated body fluid solution (SBFS) using Scanning Electron Microscopy techniques (SEM), Energy Dispersive X Ray Spectrometer (EDS) and electrochemical tests. The treated samples were subjected to a static corrosion test for 0, 180 and 360 h in SFCS with pH ≈ 7.4 and T ≈37 ± 1 ° C, so as to simulate the conditions of implantation in the human body. These samples were then tested by electrochemical potentiodynamic polarization. The formed product layers as well as the surfaces were evaluated by SEM and EDS after removing such products. The samples treated with NaOH and H₂O₂/H₂SO₄ had porous and uniform coating, while the other treated samples showed a titanium oxide layer. In general, all samples of Ti6Al4V alloy with surface treatment and exposed to SBFS for different times showed, above 400 mV, a pseudo-passivation allowing confirming its advantages in biomedical applications. The characterization of the product layer confirmed the presence of calcium on the surface of the polished samples, treated with NaOH and H₂O₂/H₂SO₄, suggesting the formation of apatite on the surface. The samples with roughing treatment to 0 h of immersion SFCS presented surface damage revealed by preferential dissolution of α phase.

Keywords : Alloy Ti6Al4V; Surface treatment; Corrosion; Simulated body fluid (SBFS); Biomaterial.

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