Preparation of highly wettable coatings on Ti–6Al–4V ELI alloy for traumatological implants using micro-arc oxidation in an alkaline electrolyte

0535575 - FGÚ 2021 RIV GB eng J - Journal Article
Gabor, R. - Doubková, Martina - Gorošová, S. - Malaník, K. - Vandrovcová, Marta - Cvrček, L. - Drobíková, K. - Kutláková Mamulová, K. - Bačáková, Lucie
Preparation of highly wettable coatings on Ti–6Al–4V ELI alloy for traumatological implants using micro-arc oxidation in an alkaline electrolyte.
Scientific Reports. Roč. 10, č. 1 (2020), č. článku 19780. ISSN 2045-2322. E-ISSN 2045-2322
R&D Projects: GA ČR(CZ) GA20-01570S
Institutional support: RVO:67985823
Keywords : Ti-6AI-4V ELI alloy coatins * implants * micro-arc oxidation * alkaline electrolyte * biocompatibility
OECD category: Orthopaedics
Impact factor: 4.380, year: 2020
Method of publishing: Open access
https://www.nature.com/articles/s41598-020-76448-w

Pulsed micro-arc oxidation (MAO) in a strongly alkaline electrolyte (pH > 13), consisting of Na2SiO3⋅9H2O and NaOH, was used to form a thin porous oxide coating consisting of two layers differing in chemical and phase composition. The unique procedure, combining MAO and removal of the outer layer by blasting, enables to prepare a coating suitable for application in temporary traumatological implants. A bilayer formed in an alkaline electrolyte environment during the application of MAO enables the formation of a wear-resistant layer with silicon incorporated in the oxide phase. Following the removal of the outer rutile-containing porous layer, the required coating properties for traumatological applications were determined. The prepared surfaces were characterized by scanning electron microscopy, X-ray diffraction patterns, X-ray photoelectron spectroscopy, atomic force microscopy and contact angle measurements. Cytocompatibility was evaluated using human osteoblast-like Saos-2 cells. The newly-developed surface modifications of Ti–6Al–4V ELI alloy performed satisfactorily in all cellular tests in comparison with MAO-untreated alloy and standard tissue culture plastic. High cell viability was supported, but the modifications allowed only relatively slow cell proliferation, and showed only moderate osseointegration potential without significant support for matrix mineralization. Materials with these properties are promising for utilization in temporary traumatological implants.
Permanent Link: http://hdl.handle.net/11104/0314541