Formation mechanism of Al2O3/MoS2 nanocomposite coating by plasma electrolytic oxidation (PEO)

Babak GHORBANIAN; Mohammad TAJALLY; Seyed Mohammad MOUSAVI KHOIE; Hossein TAVAKOLI

doi:10.1088/2058-6272/ab777c

Plasma Science and Technology > 2020 > 22(6): 65503-065503. > DOI: 10.1088/2058-6272/ab777c

Babak GHORBANIAN, Mohammad TAJALLY, Seyed Mohammad MOUSAVI KHOIE, Hossein TAVAKOLI. Formation mechanism of Al₂O₃/MoS₂ nanocomposite coating by plasma electrolytic oxidation (PEO)[J]. Plasma Science and Technology, 2020, 22(6): 65503-065503. DOI: 10.1088/2058-6272/ab777c

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Formation mechanism of Al₂O₃/MoS₂ nanocomposite coating by plasma electrolytic oxidation (PEO)

¹ Faculty of Materials and Metallurgical Engineering, Semnan University, PO Box 35131-19111, Semnan, Iran
² Faculty of Mining and Metallurgical Engineering, Amirkabir University of Technology, PO Box 15875-4413 Tehran, Iran

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Received Date: November 23, 2019
Revised Date: February 16, 2020
Accepted Date: February 17, 2020

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Abstract

Abstract

In this study, an Al₂O₃/MoS₂ nanocomposite coating was created on an aluminum 1050 substrate using the plasma electrolytic oxidation method. The zeta potential measurements showed that small MoS₂particles have negative potential and move toward the anode electrode. The nanoparticles of MoS₂ were found to have a zeta potential of −25 mV, which prevents suspension in the solution. Thus, to produce an Al₂O₃/MoS₂ nanocomposite, one has to use the microparticles of MoS₂. The X-ray diffraction analyses showed that the produced coatings contained α-Al₂O₃, γ-Al₂O₃, and MoS₂, and that the size of MoS2 particles can be reduced to 30 nm. It was observed that prolonged suspension in the electrolyte results in an enhanced formation of an Al₂O₃/MoS₂ nanocomposite. Using the results, it was hypothesized that the mechanism of the formation of the Al2O3/MoS2 nanocomposite coating on the aluminum 1050 substrate is based on electrical energy discharge.
- plasma electrolytic oxidation,
- corrosion,
- Al₂O₃/MoS₂ nanocomposite,
- tribology

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Formation mechanism of Al2O3/MoS2 nanocomposite coating by plasma electrolytic oxidation (PEO)

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Formation mechanism of Al₂O₃/MoS₂ nanocomposite coating by plasma electrolytic oxidation (PEO)