Effects of ultrasound on the evolution of plasma electrolytic oxidation process on 6061Al alloy

Shen, Dejiu; He, Dingyong; Liu, Fangfei; Guo, Changhong; Cai, Jun; Li, Guolong; Ma, Huijuan

doi:10.1016/j.ultras.2013.12.011

Cited by 20 publications

(14 citation statements)

References 23 publications

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“…Such a phenomenon produces a hightemperature/high-pressure microenvironment on the sample surfaces, providing additional energy and reducing the breakdown voltage. [42] The breakdown voltage is defined as the lowest voltage which can break down the oxide coating formed on the substrate. [35] As shown in Figure 1, the breakdown voltage (the beginning of nonlinear segment) of ultrasonic-assisted samples is around 213 V and the untreated sample is around 230 V. Afterward, the voltage exceeds the breakdown voltage, which means the commence of stage II (50-200 s).…”

Section: Formation Of Microarc Oxidation Coatingsmentioning

confidence: 99%

“…In addition, the cavitation effect of ultrasonic increases the discharge channels and enhances the formation of the melt at stage II. [42] Therefore, ultrasonic assistance would promote the growth of microarc oxidation coatings.…”

Section: Microstructural Characterizationsmentioning

confidence: 99%

“…[34] As such, such coatings have higher microhardness, better wear resistance, and better corrosion resistance. [34,41,42] However, rare literature has investigated the microarc oxidation of Ti-6Al-4V alloy with ultrasonic assistance for potential biomedical applications. [43] The effects of ultrasonic assistance on the detailed microstructural features of the produced oxide coatings on Ti-6Al-4V alloy are still not understood.…”

Section: Introductionmentioning

confidence: 99%

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Improved Wear and Corrosion Resistance of Microarc Oxidation Coatings on Ti–6Al–4V Alloy with Ultrasonic Assistance for Potential Biomedical Applications

et al. 2021

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Although microarc oxidation is frequently used in producing wear‐ and corrosion‐resistant coatings on Ti and Ti alloys for biomedical applications, the formation of nonuniform microstructure of the coatings is still unavoidable. To overcome this drawback, this work adopts ultrasonic assistance in the microarc oxidation of Ti–6Al–4V and systematically investigates the influences of ultrasonic treatment with different durations on the coating microstructures and resultant properties. The positive effects of ultrasonic, such as cavitation effect, sound flow effect, and mechanical effect, accelerate the cooling rate of electrolyte and promote the homogeneity of the solute on the sample surface. Therefore, the ultrasonic‐assisted coatings exhibit uniform microstructures with fewer cracks and therefore improve performances. For instance, compared with the counterpart without ultrasonic assistance, the ultrasonic‐assisted coating with 15 min duration demonstrates 25.1% lower mass loss in the tribology test and half corrosion density in Hank's solution. Such results indicate that ultrasonic assistance in microarc oxidation of Ti–6Al–4V can homogenize the microstructures of coatings and enhance their corrosion resistance and wear resistance in human body.

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Section: Formation Of Microarc Oxidation Coatingsmentioning

confidence: 99%

Section: Microstructural Characterizationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improved Wear and Corrosion Resistance of Microarc Oxidation Coatings on Ti–6Al–4V Alloy with Ultrasonic Assistance for Potential Biomedical Applications

et al. 2021

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“…1. It is known that the increase of the processing time usually causes Table III. an increase in coating thickness [13]. Similarly, coating roughness increases with the increasing coating thickness [14].…”

Section: Thickness and Roughnessmentioning

confidence: 91%

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

Yılmaz

Şahin

2016

Acta Phys. Pol. A

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Micro arc oxidation (MAO) of aluminum alloy samples was studied using bipolar pulses with various pulse durations under constant duty cycle. The processing times were chosen as 20, 30 and 40 minutes. The X-ray diffraction (XRD) technique, scanning electron microscope (SEM), surface roughness measurement (Ra) and indentation tests were employed to investigate the phase distribution, microstructure, surface properties and hardness of the coatings, respectively. By increasing the pulse duration and processing time, coatings with different surface roughness, thickness and hardness were fabricated.

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“…R L and L represent the inductive elements corresponding to the inductive loop. The impedance of CPE is defined as [33,34]:…”

Section: Electrochemical Impedance Spectroscopy (Eis) Analysismentioning

confidence: 99%

Influence of Sealing Treatment on the Corrosion Resistance of PEO Coated Al-Zn-Mg-Cu Alloy in Various Environments

et al. 2019

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In the present work, a coating was prepared on an Al alloy substrate by plasma electrolytic oxidation (PEO). To seal the micro defects in the oxide scale, a siloxane layer was prepared on the PEO coating by sol gel method. The polymer sealant was synthesized from Tetraethoxy silane (TEOS) and methacryloxy propyl trimethoxyl silane (MPTES). The chemical structure of the polymer was studied by Fourier transform infrared spectroscopy (FTIR). The morphologies and microstructure of the PEO coating and siloxane coating were investigated by scanning electron microscopy (SEM). The results showed that siloxane formed a continuous layer on the surface and effectively sealed the micro defects. The corrosion behavior of the coatings in three different corrosion solutions (NaCl, HCl, and NaOH) was examined by electrochemical impedance spectroscopy and potentiodynamic polarization. The corrosion resistance of the sealed coatings was superior to that of the PEO coating because it prevented the penetration of corrosive solutions. The corrosion resistance of the sealed coatings was found to decrease with increasing electrolyte concentration. The work demonstrated that siloxane sealing may greatly enhance the corrosion resistance of Al-based PEO coating in acidic, neutral, and alkaline environments.

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Effects of ultrasound on the evolution of plasma electrolytic oxidation process on 6061Al alloy

Cited by 20 publications

References 23 publications

Improved Wear and Corrosion Resistance of Microarc Oxidation Coatings on Ti–6Al–4V Alloy with Ultrasonic Assistance for Potential Biomedical Applications

Improved Wear and Corrosion Resistance of Microarc Oxidation Coatings on Ti–6Al–4V Alloy with Ultrasonic Assistance for Potential Biomedical Applications

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

Influence of Sealing Treatment on the Corrosion Resistance of PEO Coated Al-Zn-Mg-Cu Alloy in Various Environments

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