Effect of duty cycle and applied current frequency on plasma electrolytic oxidation (PEO) coating growth behavior

Dehnavi, Vahid; Luan, B.; Shoesmith, David W.; Liu, Xing Yang; Rohani, Sohrab

doi:10.1016/j.surfcoat.2013.03.041

Cited by 233 publications

(129 citation statements)

References 27 publications

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“…La señal de control de frecuencia y ciclo útil programable activó los transistores MOSFET (Dehnavi et al, 2013); cada uno de ellos en esta configuración presentó una caída de tensión muy baja entre los terminales de drenaje y de surtidor que puede ser despreciada; por lo tanto la tensión obtenida del conversor AC DC fue la misma suministrada en la OEP, mientras que la corriente demandada se controló con la conmutación de los transistores. En la práctica se observó que una variación del ciclo útil de la señal de control se ve reflejada en la tensión de alimentación del montaje de la OEP.…”

Section: Resultados Y Análisisunclassified

Implementación De Una Fuente Conmutada Para Uso en La Técnica De Oxidación Electrolítica Con Plasma

2017

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Recibido 04-04-2017, aceptado 12-06-2017, versión final 25-07-2017.Artículo Investigación RESUMEN: Se implementó una fuente conmutada para ser utilizada en la técnica de Oxidación Electrolítica con Plasma (OEP). Los dispositivos electrónicos que se usaron son comunes y de bajo costo, lo que facilita la construcción del sistema. Se utilizó un microcontrolador de MICROCHIP para generar una señal digital con control de frecuencia y ciclo útil; también se usó un banco de condensadores y un puente de diodos para rectificar la alimentación suministrada directamente por la red eléctrica. El manejo de la potencia se hizo con transistores MOSFET en configuración "low side", la medición de la corriente se hizo con un sensor de Efecto Hall y los datos se enviaron a un computador mediante comunicación USB para ser visualizados a través de un algoritmo creado en LabVIEW. La fuente fue probada para crear microcavidades en láminas de titanio con el objetivo de formar nanoestructuras de dióxido de titanio.PALABRAS CLAVE: Fuente conmutada; oxidación electrolítica con plasma; ciclo útil; MOSFET.ABSTRACT: A switched-mode power supply was implemented for using in the Plasma Electrolytic Oxidation (PEO) technique. The electronic devices are inexpensive and ordinarily used, which facilitates the construction of the system. A MICROCHIP microcontroller was used for generating a digital signal with frequency and duty cycle control; a capacitor bank and a diode bridge were also used for rectifying the input signal from the electrical network. The management of the output voltage was made with an arrangement of MOSFET transistors in the "low side" configuration; the measurement of the current was made with a Hall Effect sensor and using the USB communication the data was sent to a computer for visualization with a LabVIEW algorithm. The power supply was tested for creating microcavities in a titanium sheet with the aim of forming nanostructures of titanium dioxide.

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Section: Resultados Y Análisisunclassified

Implementación De Una Fuente Conmutada Para Uso en La Técnica De Oxidación Electrolítica Con Plasma

2017

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“…Behin et al (2014) utilized liquid waste stream from a Plasma Electrolytic Oxidation (PEO) process. The electrolytes used in PEO typically contained low concentrations of alkaline solutions (Dehnavi et al, 2013). The waste stream of PEO contained Na (673 mg L…”

Section: Introductionmentioning

confidence: 99%

Continuous Flow Synthesis of Zeolite-A from Coal Fly Ash Utilizing Microwave Irradiation with Recycled Liquid Stream

Bukhari¹,

Rohani²

2017

American Journal of Environmental Sciences

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Coal Fly Ash (CFA) was converted to zeolite using continuous microwave reactors while minimizing the wastewater produced during the zeolitization process. At bench scale, a continuous flow tubular microwave reactor was used to explore the effect of microwave irradiation on the crystallinity of the product. The waste water was reused in consecutive runs and Inductively Coupled Plasma (ICP) analysis was conducted during and after each run to observe the concentration of the cations. An increase in the production of hydroxysodalite compared to zeolite-A was noted at higher levels of microwave energy. The XRD and SEM analyses were also conducted to corroborate the results. The Cation Exchange Capacity (CEC) measurement showed the highest value of 0.405 meq/g when Deionized (DI) water was used, the CEC dropped to 0.177 meq/g for thrice recycled waste stream. It was also found that higher microwave irradiation resulted in faster crystal growth and the product crystallinity reached its maximum at 810 W of microwave irradiation in 60 min while 335 W of microwave irradiation resulted in the same crystallinity after 120 min of reaction.

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“…It has been widely used by active companies, such as Keronite (UK), Magoxid-Coat (Germany), and Microplasmic (USA), active in commercial development of PEO technology [23]. Primarily used for pure aluminum or alloyed [23][24][25][26][27][28][29][30] aluminum treatments, PEO was applied recently for the oxidation of magnesium and its alloys [29][30][31][32][33] and titanium and its alloys [34][35][36][37][38][39][40][41][42][43][44] as well as niobium [45][46][47], zirconium [48][49][50][51], and tantalum [52][53][54][55]. In recent years, titanium and its alloys used as biomaterials drew the attention of numerous teams of researchers in the world.…”

Section: Introductionmentioning

confidence: 99%

Development of copper-enriched porous coatings on ternary Ti-Nb-Zr alloy by plasma electrolytic oxidation

Rokosz

Hryniewicz

Raaen

et al. 2016

Int J Adv Manuf Technol

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In this paper, a preparation method and characteristics of porous coatings enriched in copper distributed in the whole volume on a ternary Ti-Nb-Zr alloy biomaterial obtained by plasma electrolytic oxidation (PEO) in an electrolyte containing H 3 PO 4 within Cu(NO 3 ) 2 at potentials of 180 and 450 V are presented. It has been shown that the PEO potential has impact on the thickness of the coatings, i.e., the higher the potential used, the thicker the coating obtained. Using XPS study, it was shown that copper inside the coating appears as Cu + and Cu 2+ ions, while titanium, niobium, and zirconium appear as Ti 4+ , Nb 5+ , and Zr x+ (x ≤ 2), respectively. It was also found that the roughness of PEO coating formed at 450 V is higher than the one obtained at 180 V, and it is well correlated with bigger pores after the PEO treatment. Additionally, in this paper two PEO coating models composed of three sub-layers are presented. The thickness of the outer top porous sub-layer obtained after PEO oxidation at both 180 and 450 V equals to about 2 μm, while the semi-porous as well as transition sub-layers are thicker after PEO processing at 450 V (5 μm) than those obtained at 180 V (4 μm thick). The creation of the top porous and transition compact sub-layer of PEO coating may be explained by switch-on and switch-off of the PEO potential, while the middle and semi-porous sub-layers are most likely formed during the stable voltage conditions of PEO treatment.

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Effect of duty cycle and applied current frequency on plasma electrolytic oxidation (PEO) coating growth behavior

Cited by 233 publications

References 27 publications

Implementación De Una Fuente Conmutada Para Uso en La Técnica De Oxidación Electrolítica Con Plasma

Implementación De Una Fuente Conmutada Para Uso en La Técnica De Oxidación Electrolítica Con Plasma

Continuous Flow Synthesis of Zeolite-A from Coal Fly Ash Utilizing Microwave Irradiation with Recycled Liquid Stream

Development of copper-enriched porous coatings on ternary Ti-Nb-Zr alloy by plasma electrolytic oxidation

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