Corrosion performance of the biocompatible β-Ti12Mo6Zr2Fe alloy submitted to laser and plasma-nitriding surface modifications. (December 2022)

• Record Type: Journal Article
• Authors: Travessa, Dilermando Nagle; Guedes, Geovana Vilas Bôas; de Oliveira, Aline Capella; Silva Sobrinho, Argemiro Soares da; Roche, Virginie; Jorge, Alberto Moreira
• Is Part Of: Corrosion science. Volume 209(2022)
• Publication Date: 2022-12
• Subjects: Beta-Titanium alloy -- Nitriding -- Surface laser remelting -- Plasma-enhanced chemical vapour deposition -- Corrosion -- Electrochemical impedance spectroscopy; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110740
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The corrosion behaviour of laser and plasma nitrided β-Ti12Mo6Zr2Fe biomaterial was evaluated. Polarisation curves and electrochemical impedance spectroscopy were performed in simulated body fluid (SBF) at 37 °C. Both treatments formed titanium-nitride at the alloy's surface, and significantly improved the corrosion performance of the alloy. At anodic potentials of the order of 1.0 V, the titanium-nitride layer seems to oxidise, independent of the nitriding process. Nanometric fissures formed on the plasma titanium-nitride layer seems to govern the impedance response at low frequencies, exposing the substrate to the electrolyte. Laser titanium-nitride layer is thicker and lead to a better corrosion performance. Graphical Abstract: ga1 Highlights: Bioactivity, elastic modulus, and stability are important issues of Ti implants. Low modulus, no toxic high stable β-Ti alloys are candidates for human implants. Laser and plasma processing are efficient in designing surface characteristics of metals. Laser and plasma nitriding imposes compositional and microstructural changes. Changes caused by nitriding improves corrosion performance of β-Ti alloys.