Plasma electrolytic oxidation coatings with particle additions – A review

Lu, Xiaopeng; Mohedano, M.; Blawert, Carsten; Matykina, E.; Arrabal, R.; Kainer, Karl Ulrich; Zheludkevich, Mikhail L.

doi:10.1016/j.surfcoat.2016.08.055

Cited by 428 publications

(156 citation statements)

References 132 publications

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“…Formation of PEO coatings is closely related with generation of micro-arcs on the surface of metallic substrates in aqueous alkaline electrolytes [1][2][3][4][5][6][7][8][9][10]. Al alloys are readily dissolved in alkaline solutions but anodic oxide film can grow if appropriate anions are provided [3,12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Morphology and surface roughness of PEO coatings are quite dependent on the size and lifetime of micro-arcs generated during the PEO treatment. Generally size and lifetime of micro-arcs increase and color of micro-arcs changes from white to orange with increasing PEO treatment time [3,9]. To obtain uniform thickness and low surface roughness, micro-arcs should be generated uniformly over the entire surface.…”

Section: Introductionmentioning

confidence: 99%

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Lateral Growth of PEO Films on Al1050 Alloy in an Alkaline Electrolyte

Moon¹,

Kim²

2017

Journal of the Korean institute of surface engineering

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This article reports for the first time on the lateral growth of PEO (plasma electrolytic oxidation) films on Al1050 alloy by the application of anodic pulse current in an alkaline electrolyte. Generation of microarcs was observed at the edges initially and then moved towards the central region with PEO treatment time. Disc type PEO film islands with about 20 µm diameter were formed first and they grew laterally by the formation of new disc type PEO films at the edge of pre-formed PEO islands. The PEO film islands were found to be interconnected completely and form a continuous PEO film when generation of small size microarcs are terminated at the central part of the specimen, resulting in very smooth surface with low surface roughness less than 1 µm of R a . Further PEO treatment after the complete interconnection of PEO films islands showed local thickening of PEO films by vertical growth. It is concluded that very smooth PEO film surface can be obtained by lateral growth mechanism rather than vertical growth of them.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lateral Growth of PEO Films on Al1050 Alloy in an Alkaline Electrolyte

Moon¹,

Kim²

2017

Journal of the Korean institute of surface engineering

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“…In this perspective, many techniques have been employed for performing coatings on metallic materials such as plasma spraying [1], electrophoretic deposition [2], ion implantation [3], sol-gel [4], plasma electrolytic oxidation [5], among others [6]. Plasma electrolytic oxidation (PEO) is one of the techniques for this purpose to enhance the mechanical properties, wear resistance, and the good adhesion with the substrate exhibited by the coatings.…”

Section: Introductionmentioning

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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“…Coatings formed by the PEO process usually contain crystalline and amorphous phases with constituent species originating from both the metal and electrolyte. Recent developments in this area are focused on the addition of nanoparticles into the electrolyte, aiming at in-situ incorporation them into PEO-coatings [3][4][5][6][7][8][9][10][11][12][13][14][15]. The corrosion resistance was effectively improved by the addition of TiO2 nanoparticles in the electrolyte [5].…”

Section: Introductionmentioning

confidence: 99%

Formation and properties of composite nanostructured PEO-coatings on metals and alloys

2017

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Abstract.Results of investigation of the incorporation of zirconia and titanium nitride nanoparticles into the coatings formed on magnesium alloy by plasma electrolytic oxidation are presented. Comprehensive research of electrochemical and mechanical properties of obtained coatings was carried out. It was established that the polarization resistance of the samples with a coating containing zirconia nanoparticles is in two fold higher than for the sample with base PEO-coating. One of the important reasons for improving the protective properties of coatings formed in electrolytes containing nanoparticles consists in enhanced morphological characteristics, in particular, the porosity decrease and increase of thickness and resistivity of porousless sublayer in comparison with base PEO-layer. Incorporation of zirconia and titanium nitride particles into the coating increases the mechanical performances. The coating containing nanoparticles have greater hardness and are more wear resistant in comparison with the coatings formed in the electrolyte without nanoparticle.

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Plasma electrolytic oxidation coatings with particle additions – A review

Cited by 428 publications

References 132 publications

Lateral Growth of PEO Films on Al1050 Alloy in an Alkaline Electrolyte

Lateral Growth of PEO Films on Al1050 Alloy in an Alkaline Electrolyte

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

Formation and properties of composite nanostructured PEO-coatings on metals and alloys

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