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

Ayoub Tanji; Xuesong Fan; Ridwan Sakidja; Peter K. Liaw; Hendra Hermawan

doi:10.1016/j.electacta.2022.140651

Niobium addition improves the corrosion resistance of TiHfZrNb_x high-entropy alloys in Hanks’ solution

Ayoub Tanji, Xuesong Fan, Ridwan Sakidja, Peter K. Liaw, Hendra Hermawan

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

High-strength TiHfZrNb_x 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 TiHfZrNb_x 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.

Original language	English
Article number	140651
Journal	Electrochimica Acta
Volume	424
DOIs	https://doi.org/10.1016/j.electacta.2022.140651
State	Published - Aug 20 2022
Externally published	Yes

Funding

The present work was funded by the Natural Sciences and Engineering Research Council of Canada (NSERC) via Discovery Grant (RGPIN-2017–04274) and the Canadian Foundation for Innovation (CFI) through the John R. Evans Leaders Fund (#37282). A. Tanji and H. Hermawan gratefully thank Dr. P. Chevalier from The Center for Research on Advanced Materials (CERMA) for the assistance in the XPS analysis, and Prof. Mitsuo Niinomi's team formerly at the Institute for Materials Research (IMR) Tohoku University, especially Dr. P. Fernandes Santos for providing the titanium samples. X. Fan and P. K. Liaw very much appreciate the supports from (1) the National Science Foundation (DMR-1611180 and 1809640) with program directors, Drs. J. Yang, G. Shiflet, and D. Farkas and (2) the US Army Research Office (W911NF-13–1–0438 and W911NF-19–2–0049) with program managers, Drs. M.P. Bakas, S.N. Mathaudhu, and D.M. Stepp. The neutron diffraction portion of this research used resources at Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. X. Fan and P. K. Liaw greatly appreciate the significant effort of the VULCAN instrument team, Dr. Y. Chen and Dr. K. An, in planning and performing experiments.

Funders	Funder number
Center for Research on Advanced Materials
John R. Evans Leaders Fund	37282
National Science Foundation	DMR-1611180, 1809640
National Science Foundation
Army Research Office	W911NF-13–1–0438, W911NF-19–2–0049
Army Research Office
Office of Science
Oak Ridge National Laboratory
Institute for Materials Research, Ohio State University
Natural Sciences and Engineering Research Council of Canada	RGPIN-2017–04274
Natural Sciences and Engineering Research Council of Canada
Canada Foundation for Innovation
Tohoku University

Keywords

Biomaterials
Corrosion-resistance
High-entropy alloys
Passive films

Access to Document

10.1016/j.electacta.2022.140651

Cite this

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title = "Niobium addition improves the corrosion resistance of TiHfZrNbx high-entropy alloys in Hanks{\textquoteright} solution",

abstract = "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{\textquoteright} 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.",

keywords = "Biomaterials, Corrosion-resistance, High-entropy alloys, Passive films",

author = "Ayoub Tanji and Xuesong Fan and Ridwan Sakidja and Liaw, {Peter K.} and Hendra Hermawan",

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AU - Tanji, Ayoub

AU - Fan, Xuesong

AU - Sakidja, Ridwan

AU - Liaw, Peter K.

AU - Hermawan, Hendra

PY - 2022/8/20

Y1 - 2022/8/20

N2 - 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.

AB - 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.

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