Enhancing the corrosion behavior of Ti–6Al–4V and nitinol alloys by simple chemical oxidation in H2O2

A.L. MARTÍNEZ; M. SAUGO; D.O. FLAMINI; S.B. SAIDMAN

MATERIALS CHEMISTRY AND PHYSICS

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2023 vol. 295

0254-0584

This study investigated the effect of hydrogen peroxide treatment on the corrosionbehavior of two Ti biomaterial alloys (Ti-6Al-4V and Nitinol (NiTi)). The obtained oxideswere characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) andX-ray photoelectron spectroscopy (XPS). Even though both oxidized alloys are constitutedmostly by TiO2 oxide on their surfaces, different topographies were obtained: a non-porousfilm with mud-cracked structure type was formed on Ti-6Al-4V while some microporeswere observed on the NiTi surface. Oxidized NiTi samples also exhibited Ni speciespresent as oxides and hydroxides in the form of Ni2+ and Ni3+. The ICP-AES analysisdemonstrated that the presence of the oxides reduced the amount of alloying ionsreleased to the simulated physiological environment after the electrochemical tests. Theresults show that this simple technique without the need for thermal post-treatment isenough to reduce the corrosion current density (icorr) and shift the corrosion potential (Ecorr)to more noble values enhancing the anticorrosive properties of both Ti-based alloys inRinger solution. Moreover, the hydrophilicity of the surfaces was increased after thetreatment.