Bioactive coatings on Ti6Al4V alloy formed by plasma electrolytic oxidation

Durdu, Salih; Usta, Metin; Berkem, Ali Sabri

doi:10.1016/j.surfcoat.2015.07.053

Cited by 85 publications

(44 citation statements)

References 60 publications

(59 reference statements)

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“…The produced markings are very sharp, reproducible and precise. Another benefit is that the process enables flexible change of marking colours on the fly with respect to laser processing parameters [6,[13][14][15][16].Titanium and its alloys have several specific properties, like good strength to weight ratio, high strength, good chemical stability, high temperature stability, biocompatibility, corrosion resistance and resistance to fatigue and wear, and can be heat treated or surface treated in order to achieve particular hardness and strength [11,26].Laser induced oxidation of metals is a gaseous high-temperature corrosion process, where thin layers of oxides or other more complex oxidation formations are formed. With this process, different colours can be produced on the titanium surface.…”

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confidence: 99%

Influence of Laser Colour Marking on the Corrosion Properties of Low Alloyed Ti

et al. 2019

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In the field of surface treatment, laser colour marking can be used to produce coloured marks on the surfaces of metals. Laser colour markings can be applied to various materials, but on titanium alloys a wide spectra of vivid colours can be achieved. This study presents an analysis of the corrosion properties of laser treated surfaces that were exposed to aggressive environments. Different samples were prepared with laser light of various power intensities and processing speeds. The samples were prepared on low alloyed Ti. Electrochemical, spectroscopic and microstructural analyses were conducted in order to study the properties of the laser treated surfaces. Corrosion testing showed different effects of laser power and production speed on the properties of the laser treated surfaces. It was shown that a high intensity and slow processing rate affect the surfaces by forming oxides that are relatively stable in a corrosive environment of 0.1 M NaCl. Spectroscopic investigations including scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analyses showed the differences in chemical structure of the surface layer formed after laser treatment. Similarly, microstructural investigations showed different effects on the surface and sub-surface layer of the laser treated samples. advantages of laser induced oxidation are that the process is non-contact and that the marking of smaller surfaces can be made fast at relatively low cost. The produced markings are very sharp, reproducible and precise. Another benefit is that the process enables flexible change of marking colours on the fly with respect to laser processing parameters [6,[13][14][15][16].Titanium and its alloys have several specific properties, like good strength to weight ratio, high strength, good chemical stability, high temperature stability, biocompatibility, corrosion resistance and resistance to fatigue and wear, and can be heat treated or surface treated in order to achieve particular hardness and strength [11,26].Laser induced oxidation of metals is a gaseous high-temperature corrosion process, where thin layers of oxides or other more complex oxidation formations are formed. With this process, different colours can be produced on the titanium surface. During laser oxidation, titanium oxides are formed at the surface if the marking is carried out in an oxidative atmosphere. Titanium oxides are not expensive, biocompatible, non-toxic and mechanically and chemically stable [16]. On the surfaces, there are thin layers present in the form of anatase, brookite, rutile or in the amorphous phase [6,13,16]. In the white light spectrum, they are highly transparent and exhibit a wide spectrum of vivid colours as a result of the interference between white light and the borders between different phases. The obtained colours depend on the thickness of the oxide layer, refractive index and the interference between light and incidence angle [6,13,15,27]. There are many laser parameters, such as pulse duration, pulse repetition rate, pulse en...

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confidence: 99%

Influence of Laser Colour Marking on the Corrosion Properties of Low Alloyed Ti

et al. 2019

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“…The PEO technique has been gaining an increasing interest recently as it could provide superior adhesion between the coatings and the substrate and formation of high crystalline coatings with porous surface morphologies [136], [137]. Moreover, the PEO process is a low cost, simple to operate, eco-friendly and versatile [138].…”

Section: Plasma Electroly Plasma Electroly Plasma Electroly Plasma Elmentioning

confidence: 99%

Biomedical materials and techniques to improve the tribological, mechanical and biomedical properties of orthopedic implants – A review article

Ibrahim

Sarhan

Yusuf

et al. 2017

Journal of Alloys and Compounds

260

100

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“…However, the samples analyzed did not present this phase possibly for the short time of heat treatment employed. For good relationship, rutile/anatase researchers have been reported heat treatments of 9 h to 13 h [25]. The signal obtained at 25 ° was indicative of an amorphous phase, which was related to the growth of amorphous oxides and other components with non-crystalline phases.…”

Section: Xrdmentioning

confidence: 99%

EIS, Mott Schottky and EFM analysis of the electrochemical stability and dielectric properties of Ca-P-Ag and Ca-P-Si-Ag coatings obtained by plasma electrolytic oxidation in Ti6Al4V

Leal-Marin

Estupiñán-Duran

2017

Rev. Fac. Ing. Univ. Antioquia

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Ti6Al4V ELI (ASTM F136) alloy is one of the most used alloys in devices for osteosynthesis and joint replacement. However, the properties of this alloy can be improved regarding biocompatibility and the osteointegration with the bone tissue through coatings. The aim of this study was the evaluation of the electrochemical behavior of a coating obtained by plasma electrolytic oxidation on Ti6Al4V ELI, using electrolyte solutions enriched with PO 4 2-, Ca +2, Si +4 ions and various concentrations of Ag +1. The coatings were characterized by electrochemical impedance spectroscopy (EIS) and Mott-Schottky (M-S) in a three-electrode cell with a simulated physiological solution. The electrochemical behavior was compared with electrostatic force microscopy (EFM). The EIS results showed improved stability properties in corrosion for Ca-P-Ag coatings, compared with Ca-P-Si-Ag. Nyquist and Bode Spectra showed relaxations related to charge transference to the double electrochemical layer and the reflex of the microstructural changes and conductivity of the coating given by its composition. According to with M-S results, all the samples showed an n-type conductivity increased with silver inclusion. The potential, the phase, and amplitude of the coatings with silver inclusion compared to uncoated Ti6Al4V were observed by EFM. RESUMEN:El Ti6Al4V ELI (ASTM F136) es una de las aleaciones más empleadas en dispositivos de osteosíntesis y reemplazo articular. Sin embargo, las propiedades de esta aleación pueden ser mejoradas respecto a su biocompatibilidad y osteointegración con el tejido óseo a través de recubrimientos. El objetivo de este trabajo fue evaluar el comportamiento electroquímico de un recubrimiento obtenido por oxidación por plasma electrolítico sobre Ti6Al4V ELI empleando soluciones electrolíticas enriquecidas con iones de PO 4 2-, Ca +2 , Si +4 y varias concentraciones de Ag +1. Los recubrimientos se caracterizaron mediante espectroscopia de impedancia electroquímica (EIS) y Mott-Schottky (M-S) en una celda de tres electrodos con una solución fisiológica simulada. El comportamiento electroquímico se contrastó con microscopía de fuerza electrostática (EFM), donde se analizó el potencial eléctrico del recubrimiento. Los resultados de EIS mostraron mejores propiedades de estabilidad frente a la corrosión en los sustratos recubiertos con Ca-P-Ag, comparados con los recubiertos con Ca-P-Si-Ag. Los espectros de Nyquist y Bode mostraron relajaciones relacionadas con la transferencia de carga hacia la doble capa electroquímica como reflejo de los cambios microestructurales y de conductividad de los recubrimientos, dada por la presencia particular en cada caso, de los elementos contenidos en estos. De acuerdo con los resultados de M-S, todas las muestras ensayadas presentaron un comportamiento con dopado tipo n, cuya conductividad incrementó con la inclusión de plata. Mediante EFM se observaron mayores contrastes en el potencial, fase y la amplitud de los recubrimientos con mayor cantidad de plata respecto al Ti6Al...

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Bioactive coatings on Ti6Al4V alloy formed by plasma electrolytic oxidation

Cited by 85 publications

References 60 publications

Influence of Laser Colour Marking on the Corrosion Properties of Low Alloyed Ti

Influence of Laser Colour Marking on the Corrosion Properties of Low Alloyed Ti

Biomedical materials and techniques to improve the tribological, mechanical and biomedical properties of orthopedic implants – A review article

EIS, Mott Schottky and EFM analysis of the electrochemical stability and dielectric properties of Ca-P-Ag and Ca-P-Si-Ag coatings obtained by plasma electrolytic oxidation in Ti6Al4V

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