Effect of double thermal and electrochemical oxidation on titanium alloys for medical applications

[Display omitted] •The nanotube layer is formed on the gas oxidation layers created on the titanium alloy.•The nanotubular structure is strongly dependent on previous gas oxidation.•The colonies of nanotubes of different lengths are observed.•The duplex layer demonstrates good corrosion resistance a...

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Bibliographic Details
Published in:Applied surface science 2021-10, Vol.563, p.150340, Article 150340
Main Authors: Ossowska, Agnieszka, Olive, Jean-Marc, Zieliński, Andrzej, Wojtowicz, Andrzej
Format: Article
Language:English
Subjects:
Antibacterial efficiency
Coatings
Cytotoxicity
Electrochemical oxidation
Engineering Sciences
Materials
Microstructure
Nanoindentation
Thermal oxidation
Titanium alloys
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Summary:[Display omitted] •The nanotube layer is formed on the gas oxidation layers created on the titanium alloy.•The nanotubular structure is strongly dependent on previous gas oxidation.•The colonies of nanotubes of different lengths are observed.•The duplex layer demonstrates good corrosion resistance and biological properties. The research focuses on the development and characterization of innovative thin hybrid oxide coatings obtained in subsequent processes of thermal (TO) and electrochemical (EO) oxidation. Four different surface modifications were investigated and the microstructure was determined, the mechanical, chemical and biological properties of the Ti-13Nb-13Zr alloy were assessed using scanning electron microscopy, X-ray dispersion analysis, glow discharge emission spectroscopy, Raman spectroscopy, nanoindentation and corrosion resistance measurements. The composite layers were evaluated for antimicrobial activity, cytotoxicity bioassays and wettability tests were performed. The conducted studies of two-stage oxidation (TO + EO) have shown that it is possible to obtain layers with a different structure - crystalline and nanotubular. The formation of a nanotube layer on the surface of the crystalline layer is dependent on the thickness of the crystalline layer. The produced double titanium oxide coatings show high surface roughness, high corrosion resistance, are hydrophilic, slightly antibacterial, and not cytotoxic, which has a huge impact on the process of connecting the tissue with the implant.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2021.150340