Effects of Pulse Duration on Structure and Surface Characteristics of Micro-Arc Oxidation Coatings Formed on Aluminum Alloy

Yılmaz, Mustafa Safa; Şahin, O.

doi:10.12693/aphyspola.129.673

Cited by 6 publications

(2 citation statements)

References 17 publications

(17 reference statements)

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“…It was obvious that the surface roughness' results are in the same direction with coating thickness. It should also be noted that [6,[9][10][11] surface roughness was closely related with the coating thickness. The effect of pulse duration on phase composition of MAO coatings was examined by XRD and given in Figure 4.…”

Section: Resultsmentioning

confidence: 95%

Investigation of High Energy Single Pulse Effect on Micro Arc Oxidation (MAO) Process on Aluminium

Yılmaz¹,

Şahin²

2019

IJMMME

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Micro Arc Oxidation (MAO) was applied by using high-energy anodic/cathodic pulses with various pulse durations. Anodic and cathodic pulse couples were kept at a constant voltage of 500 volts. Energy of each pulse increased with increasing duration of pulses. Since the aim of the present study was to investigate effect of pulse durations on MAO processing, other processing parameters such as duty cycle (8%), electrolyte temperature (25±5 °C), electrolyte composition (KOH, Na2SiO3.5H2O), process time (20 minutes), anodic pulse voltage, cathodic pulse voltage and chemical composition of substrate were all kept constant. Five different anodic and cathodic pulse durations were applied. Scanning electron microscope (SEM), indenter, profilometer, eddy current and X-ray diffractometer were employed to investigate the microstructure, hardness, surface roughness, coating thickness and phase distribution of the coatings. Varying of pulse duration occurred significant differences among coating specifications. Coating layers with thickness between 50-90 μm and surface roughness between 3.1-5.2 μm were obtained. The hardness of coating layers was between 800-2000 Vickers. Coatings consist of two sub-layers, inner dense layer and outer porous layer, which were a mixture of γ-Al2O3 and α-Al2O3.

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Section: Resultsmentioning

confidence: 95%

Investigation of High Energy Single Pulse Effect on Micro Arc Oxidation (MAO) Process on Aluminium

Yılmaz¹,

Şahin²

2019

IJMMME

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show abstract

“…There occurred 3 regimes with different pulse durations. It should also be noted that [6,[9][10][11] surface roughness was closely related with the coating thickness. The effect of pulse duration on the phase composition of MAO coatings was obtained by XRD analysis as given in Fig.…”

Section: Resultsmentioning

confidence: 95%

Investigation of the High Energy Single Pulses Affect on Micro Arc Oxidation Process on Aluminium

Yılmaz¹,

Şahin²

2018

World Congress on Mechanical, Chemical, and Material Engineering

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Micro Arc Oxidation (MAO) was applied by using high anodic (500 volt) and high cathodic (500 volt) voltages with increasingly pulse duration couples (anodic and cathodic single pulses). While the increasing pulse duration, the single pulse energy was increased also. Due to the investigation of the single pulse affect, all other parameters were kept constant, such as duty cycle (8%), electrolyte temperature (25±5°C), electrolyte composition (KOH, Na2SiO3.5H2O), process time (20 minutes), anodic voltage, cathodic voltage and substrate. Five different anodic and cathodic pulse durations were applied. Scanning electron microscope (SEM), indenter, profilometer, eddy current, X-ray diffractometer were employed to investigate the microstructure, hardness, surface roughness, coating thickness and phase distribution of the coatings. The pore volume and distribution of the coating layers were analysed. Varying of pulse duration occurred significant differences among coating specifications. Coating layers with thickness between 50-90 μm and surface roughness between 3.1-5.2 μm were obtained. The hardness of coating layers was between 800-2000 Vickers. Coatings consist of two layers, inner dense layer and outer porous layer, which was a mixture of γ-Al2O3 and α-Al2O3.

show abstract

Applying high voltage cathodic pulse with various pulse durations on aluminium via micro-arc oxidation (MAO)

Yılmaz

Şahin

2018

Surface and Coatings Technology

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Effects of Pulse Duration on Structure and Surface Characteristics of Micro-Arc Oxidation Coatings Formed on Aluminum Alloy

Cited by 6 publications

References 17 publications

Investigation of High Energy Single Pulse Effect on Micro Arc Oxidation (MAO) Process on Aluminium

Investigation of High Energy Single Pulse Effect on Micro Arc Oxidation (MAO) Process on Aluminium

Investigation of the High Energy Single Pulses Affect on Micro Arc Oxidation Process on Aluminium

Applying high voltage cathodic pulse with various pulse durations on aluminium via micro-arc oxidation (MAO)

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