A comparison of corrosion, tribocorrosion and electrochemical impedance properties of pure Ti and Ti6Al4V alloy treated by micro-arc oxidation process

Fazel, M.; Salimijazi, Hamidreza; Golozar, M.A.; jazi, M.R. Garsivaz

doi:10.1016/j.apsusc.2014.11.030

Cited by 175 publications

(66 citation statements)

References 22 publications

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“…Ca-P, Ca-P-Si 0.2Ag, and Ca-P-Si 0.4Ag presented a relaxation in low frequencies (0.1 Hz -50 Hz) related with mass transference despite not being the dominant mechanism of corrosion. This relaxation may be linked to a dense and continued layer in contact with the substrate, identified as an inner layer for other researchers and reported as a first time constant [27]. Moreover, the mass transference occurred at low frequencies with a capacitive behavior and a small slope about the relaxation given by charge transference (50 Hz -100 kHz) having a resistive behavior with a larger slope.…”

Section: Eis Y Mott-schottkymentioning

confidence: 58%

“…It means, highly protective coatings with a tendency to increase the substrate conductivity were obtained, which may be a reflex of its bioactivity. Ca-P-Si, Ca-P 0.2Ag, and Ca-P 0.4Ag presented a charge transference mechanism, this has been reported as a second time constant of an external porous coating layer produced by the dielectric breakdown for the PEO [27]. Where at high frequencies the porosity of the coating layer reduced the impedance values [28].…”

Section: Eis Y Mott-schottkymentioning

confidence: 84%

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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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Section: Eis Y Mott-schottkymentioning

confidence: 58%

Section: Eis Y Mott-schottkymentioning

confidence: 84%

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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“…Due to the formation of a strong, adherent coating and minimal changes to the substrate properties, MAO is used to treat aluminum, magnesium, and titanium alloys to improve wear and corrosion resistance as well as to provide thermal and electrical barriers [3][4][5][6][7][8]. Due to its environmental friendliness and ability to form thick, dense oxide coatings composed of -Al 2 O 3 and -Al 2 O 3 , MAO has also attracted increased attention as a potential replacement for hard anodizing [9][10][11][12]. While most attention has been focused on enhancing tribological properties, there has also been growing interest in using MAO as a means to deposit ceramic coatings on large aluminum panels in order to reduce noise and vibration in railway vehicles [13].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Scanning Microarc Oxidation Process

Xia

Han

Domblesky

et al. 2017

Advances in Materials Science and Engineering

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Scanning microarc oxidation (SMAO) is a coating process which is based on conventional microarc oxidation (MAO). The key difference is that deposition in SMAO is achieved by using a stainless steel nozzle to spray an electrolyte stream on the substrate surface as opposed to immersing the workpiece in an electrolyzer. In the present study, SMAO discharge characteristics, coating morphology, and properties are analyzed and compared to results obtained from MAO under similar conditions. Results show that MAO and SMAO have comparable spark and microarc lifetimes and sizes, though significant differences in incubation time and discharge distribution were evident. Results also showed that the voltage and current density for MAO and SMAO demonstrate similar behavior but have markedly different transient and steady-state values. Results obtained from coating A356 aluminum sheet show that oxide thickness and growth rate in SMAO are strongly dependent on interelectrode spacing and travel speed. Analysis of the SMAO coating morphology and structure showed that a denser and slightly harder layer was deposited in comparison to MAO and is attributed to reduced porosity and increased formation of -Al 2 O 3 . Preliminary results indicate that SMAO represents a viable process for coating of aluminum surfaces.

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“…Several modifications have been reported in the literature on the improvement of titanium surface properties [5,[15][16][17][18] by different methods, including laser-assisted methods [10,19,20]. In fact, laser technology can be employed in several industrial processes, comprising welding similar [18] and dissimilar alloys [19], or the modification of surface properties for corrosion resistance improvements [20].…”

Section: Introductionmentioning

confidence: 99%

Tribocorrosion Study of Ordinary and Laser-Melted Ti6Al4V Alloy

Silva

Churiaque

Bastos

et al. 2016

Metals

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Titanium alloys are used in biomedical implants, as well as in other applications, due to the excellent combination of corrosion resistance and mechanical properties. However, the tribocorrosion resistance of titanium alloy is normally not satisfactory. Therefore, surface modification is a way to improve this specific performance. In the present paper, laser surface-modified samples were tested in corrosion and pin-on-disk tribocorrosion testing in 0.90% NaCl under an average Hertzian pressure of 410 MPa against an alumina sphere. Laser-modified samples of Ti 6 Al 4 V were compared with ordinary Ti 6 Al 4 V alloy. Electrochemical impedance showed higher modulus for laser-treated samples than for ordinary Ti 6 Al 4 V ones. Moreover, atomic force microscopy revealed that laser-treated surfaces presented less wear than ordinary alloy for the initial exposure. For a further exposure to wear, i.e., when the wear depth is beyond the initial laser-affected layer, both materials showed similar corrosion behavior. Microstructure analysis and finite element method simulations revealed that the different behavior between the initial and the extensive rubbing was related to a fine martensite-rich external layer developed on the irradiated surface of the fusion zone.

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A comparison of corrosion, tribocorrosion and electrochemical impedance properties of pure Ti and Ti6Al4V alloy treated by micro-arc oxidation process

Cited by 175 publications

References 22 publications

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

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

Investigation of the Scanning Microarc Oxidation Process

Tribocorrosion Study of Ordinary and Laser-Melted Ti6Al4V Alloy

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