Electrochemical behaviour of titanium in KOH at high potential

Mathis, Aude; Rocca, Emmanuel; Veys‐Renaux, Delphine; Tardelli, Joffrey

doi:10.1016/j.electacta.2015.11.027

Cited by 31 publications

(14 citation statements)

References 37 publications

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“…Ikonopisov [60] stated that the breakdown voltage is practically independent of the current density. Recently, Mathis et al [46] showed that, under galvanostatic conditions, micro-arc initiation voltages observed were similar to the ones obtained during potentiodynamic scans. The authors also suggested three stages of galvanostatic conditions: i. the formation of an inner barrier inner layer leading to a sharp increase of voltage with time; ii.…”

Section: Electrochemical Behavioursupporting

confidence: 57%

“…In the first stage, anodic layer formation proceeds as the conventional anodic treatment mechanism where a compact and thin oxide film is formed. Then, when the dielectric breakdown potential is reached, oxide phases such as anatase and rutile are formed as a result of the extremely high temperatures that are locally reached at the metal/electrolyte interface due to the micro-arcs that occur at that interface [46]. Moreover, the transformation of metastable anatase to stable rutile is facilitated by the frequent micro-discharges.…”

Section: Bio-functionalizationmentioning

confidence: 99%

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Effect of bio-functional MAO layers on the electrochemical behaviour of highly porous Ti

Alves

Costa

Toptan

et al. 2020

Surface and Coatings Technology

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Ti foams are attractive for orthopaedic applications due to reduced Young's modulus and ability of bone ingrowth. However, poor corrosion behaviour and lack of bioactivity are yet to be overcome. In the present work, highly porous Ti samples were processed by powder metallurgy with space holder technique and bio-functionalized by micro-arc oxidation, resulting in nano/micro structured TiO 2 surfaces containing bioactive elements. The electrochemical behaviour of these bio-functionalized highly porous Ti surfaces was evaluated through potentiodynamic polarization and EIS in physiological solution at body temperature. Results showed that biofunctionalization improved the corrosion behaviour of highly porous Ti. However, increased macro-porosity led to an increased corrosion rate.

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Section: Electrochemical Behavioursupporting

confidence: 57%

Section: Bio-functionalizationmentioning

confidence: 99%

Effect of bio-functional MAO layers on the electrochemical behaviour of highly porous Ti

Alves

Costa

Toptan

et al. 2020

Surface and Coatings Technology

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“…Also, it has exhibited excellent corrosion protection in simulated physiological solutions [20]. Other studies have reported the presence of titanium dioxide in rutile phase in similar coatings, this phase is desirable for its stability and corrosive properties [23,24]. However, the samples analyzed did not present this phase possibly for the short time of heat treatment employed.…”

Section: Xrdmentioning

confidence: 73%

“…It is a model composite of an oxide in a double layer, wherein the first layer corresponds to a porous outer layer or coating and the second layer to an inner barrier that represents the substrate, previously described in Bode diagrams and reported by other researchers [23,24].…”

Section: Figure 3 Bode Diagrams Coatings Obtained By Peomentioning

confidence: 99%

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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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Impact of processing parameters in plasma electrolytic oxidation on corrosion resistance of magnesium alloy type AZ91

Aljohani

Aljadaan

Rubayan

et al. 2021

Engineering Reports

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This study aims to investigate the effect of the processing parameters in plasma electrolytic oxidation (PEO) on the corrosion resistance of magnesium alloy type AZ91. The PEO coatings were prepared on the samples using alkaline‐based electrolyte. Both unipolar and bipolar, different frequencies and duty cycles were applied. Corrosion tests, using potentiodynamic polarization, linear and cyclic, and electrochemical impedance spectroscopy techniques, were applied on the as‐received and PEO coated samples. Scanning electron microscopy was used to investigate the surface morphology, for example, micropores, as well as to measure the thickness of the coated layer by changing the processing parameters. The results show that the size of micropores is interrelated to the duty cycle percentage and current polarities, as the higher frequency causes thinner coating layers, with fewer micropores, consequently higher corrosion resistance. In addition, increasing the duty cycle, a denser and more compact coating was obtained. The XRD results showed a missing peak of the α‐Mg phase in a PEO coated sample using bipolar, the highest frequency (1666 Hz), and the highest duty cycle (66.6%). The mils per year calculations showed that the PEO coated has a lower corrosion rate by at least 8 times than the as‐received alloy.

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Electrochemical behaviour of titanium in KOH at high potential

Cited by 31 publications

References 37 publications

Effect of bio-functional MAO layers on the electrochemical behaviour of highly porous Ti

Effect of bio-functional MAO layers on the electrochemical behaviour of highly porous Ti

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

Impact of processing parameters in plasma electrolytic oxidation on corrosion resistance of magnesium alloy type AZ91

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