The Influence of ZnO Oxide Layer on the Physicochemical Behavior of Ti6Al4V Titanium Alloy.

Anna Woźniak,Bogusław Ziębowicz,Agata Jakóbik-Kolon,Marcin Adamiak,Zbigniew Brytan,Witold Walke

doi:10.3390/ma14010230

Anna Woźniak, Bogusław Ziębowicz + Show 4 more

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https://doi.org/10.3390/ma14010230

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Journal: Materials	Publication Date: Jan 5, 2021
Citations: 14	License type: CC BY 4.0

Affiliation: Silesian University of Technology

Abstract

Titanium and its alloys are characterized by high biocompatibility and good corrosion resistance as a result of the ability to form a TiO2 oxide layer. However, based on literature data it can be concluded that titanium degradation products, in the form of titanium particles, metal-protein groups, oxides and ions, may cause allergic, inflammatory reactions and bone resorption. The corrosion process of Ti6Al4V in the human body environment may be intensified by a decreased pH and concentration of chloride compounds. The purpose of this article was to analyze the corrosion resistance of the Ti6Al4V alloy, obtained by the selective laser melting method in a corrosion solution of neutral pH and in a solution simulating peri-implant inflammatory conditions. Additionally, the influence of zinc oxide deposited by the atomic layer deposition method on the improvement of the physicochemical behavior of the Ti6Al4V alloy was analyzed. In order to characterize the ZnO layer, tests of chemical and phase composition as well as surface morphology investigation were performed. As part of the assessment of the physicochemical properties of the uncoated samples and those with the ZnO layer, tests of wetting angle, pitting corrosion and impedance corrosion were carried out. The number of ions released after the potentiodynamic test were measured using the inductively coupled plasma atomic emission spectrometry (ICP–AES) method. It can be concluded that samples after surface modification (with the ZnO layer) were characterized by favorable physicochemical properties and had higher corrosion resistance.

Highlights

Titanium and its alloys haves been regarded as inert and biocompatible materials, which are ideal for long-lasting implantation in medical applications [1,2,3,4]
Based on the microscopic observation (Figure 2a) it ca be concluded, that the ZnO layer deposited by the atomic layer deposition (ALD) method was conformal, homogeneous and defect-free
The results reveal that the ALD method can be used to effectively modify the surface hydrophilicity/hydrophobicity of the ZnO layer

Summary

Introduction

Titanium and its alloys haves been regarded as inert and biocompatible materials, which are ideal for long-lasting implantation in medical applications [1,2,3,4]. In vivo corrosion and tribological wear of titanium materials can, lead to the release of particles in the form of TiO2, inorganic metallic salts, as well as free metal ions to the intraarticular joint space. Titanium dioxide TiO2 can alter the viability and behavior of multiple bone cells, which may result in bone resorption, aseptic implant loosening and disrupt implant retention [17,18]. On this basis, it can be concluded that the chemical and physical properties of the surface of the medical device are responsible for the proper integration of the implant with the environment of the human body. According to the studies performed by Bowen et al [28], it can be concluded that the Zn2+ ions released from a zinc implant may suppress restenosis pathways and exhibit excellent biocompatibility with the arterial tissue, which was confirmed by Yang et al [29]

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