Plasma electrolytic oxidation up to four-steps performed on niobium and Nb-Ti alloys

Plasma electrolytic oxidation (PEO) of up to four steps were performed on Niobium (Nb), and binary Niobium-Titanium alloys (Nbx-Ti, x = 50%, 90 wt.%), and the resulting oxidized surfaces were compared to their respective metallic substrate. The first and third steps were carried out in the phosphoru...

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Bibliographic Details
Published in:Surface & coatings technology 2022-05, Vol.438, p.128369, Article 128369
Main Authors: Pereira, Bruno Leandro, Lepienski, Carlos Maurício, Seba, Viviane, Nugent, Michael J.D., Torres, Ricardo, Kuroda, Pedro Akira Bazaglia, Grandini, Carlos Roberto, Soares, Paulo
Format: Article
Language:English
Subjects:
Binary alloys
Biocompatibility
Calcium ions
Chemical composition
Electrolytes
Four-step PEO
Modulus of elasticity
Niobium
Niobium-titanium alloys
Oxidation
Phosphorus
Plasma electrolytic oxidation
Substrates
Titanium base alloys
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Summary:Plasma electrolytic oxidation (PEO) of up to four steps were performed on Niobium (Nb), and binary Niobium-Titanium alloys (Nbx-Ti, x = 50%, 90 wt.%), and the resulting oxidized surfaces were compared to their respective metallic substrate. The first and third steps were carried out in the phosphorus electrolyte, whereas the second and fourth steps were oxidized in the electrolyte containing calcium ions. Coatings formed from the second step were porous, with the chemical composition containing both calcium and phosphorus elements. The PEO process decreased the elastic moduli to approximately 60 GPa and increased the surface cell viability compared to the metallic surfaces without treatment. All surfaces produced from the second step-PEO demonstrated improved characteristics for application in metallic implants. Additionally, those performed on the alloys in electrolytes containing phosphate ions (up to three steps) exhibited greater performance on cytocompatibility tests. •Niobium and Niobium-Titanium alloys were treated by Plasma Electrolytic Oxidation (PEO) up to four steps.•The 1st and 3rd steps were performed in a phosphoric solution and the 2nd and 4th in a calcium-based solution•PEO up to 3rd step exhibited improved cytocompatibility on the Niobium-Titanium alloys.•The improved cytocompatibility is related to the coating Calcium/Phosphorus ratio close to the ratio for the hydroxyapatite.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2022.128369