Publication :
Niobium addition improves the corrosion resistance of TiHfZrNbₓ high-entropy alloys in Hanks’ solution

En cours de chargement...
Vignette d'image
Fan, Xuesong
Sakidja, Ridwan
Liaw, P. K. (Peter K.)
Direction de publication
Direction de recherche
Titre de la revue
ISSN de la revue
Titre du volume
Amsterdam : Elsevier
Projets de recherche
Structures organisationnelles
Numéro de revue
High-strength TiHfZrNbₓ high-entropy alloys could become the ideal materials for small-diameter endovascular stents once their corrosion resistance in the physiological milieu is confirmed. This work aims at evaluating the corrosion resistance of a TiHfZrNbₓ high-entropy-alloys family in Hanks’ solution at 37 °C and revealing the influence of niobium on the mechanisms of dissolution and passivation. The alloys were subjected to a series of static and dynamic electrochemical tests and surface characterization, employing the static/dynamic/cyclic polarizations, impedance spectroscopy, XPS, AFM, and SEM. Results confirm a higher corrosion resistance of the alloys compared to that of CP-Ti and Ti6Al4V. The addition of niobium considerably improves the microstructural homogeneity that ensures a low dissolution rate and a greater resistance of the film due to the lower concentration of point defects. The passive film behaves as an n-type semiconductor and is composed of a mixture of TiO₂, Nb₂O₅, ZrO₂, and HfO₂ oxides, with the presence of metallic hydroxides on the outermost layer. A detailed description of the niobium influence on the mechanisms of the dissolution and passivation is presented in this work.
Electrochimica Acta, vol. 24, 140651 (2022)
URL vers la version publiée
Biomaterials , Corrosion-resistance , High-entropy alloys , Passive films
Type de document