A study of the interactive effects of hybrid current modes on the tribological properties of a PEO (plasma electrolytic oxidation) coated AM60B Mg-alloy

Hussein, R.O.; Northwood, Derek O.; Su, Jun-Feng; Nie, Xueyuan

doi:10.1016/j.surfcoat.2012.08.082

Cited by 63 publications

(43 citation statements)

References 23 publications

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“…A unipolar current mode gives rise to thicker (≈48 µm), more porous (amount and size) coatings with a higher surface roughness than those produced using a bipolar current mode (≈37 µm) or H1(U+B) and H2 (B+U) modes (≈30 µm) [24]. As shown in Fig.…”

Section: Current Mode and Current Density Effectsmentioning

confidence: 87%

“…Quantitative studies have been performed by our group relating processing to performance [6,13,15,16,22,23]. It has been confirmed that a PEO processing of Mg alloys is strongly influenced by such parameters as electrolyte chemistry, current mode and density and substrate alloy.…”

Section: Plasma Discharge Effects On Microstructure Of Coating and Prmentioning

confidence: 99%

“…Four different current modes (unipolar, bipolar and hybrid (unipolar-bipolar and bipolar-unipolar)) were used in the PEO processing of Mg-alloy AM60B in a mixed aluminate and phosphate electrolyte [22,24]. Changing the current mode produces changes in the PEO process characteristics, including the breakdown voltage and discharge events, both in terms of discharge intensity and density [22].…”

Section: Current Mode and Current Density Effectsmentioning

confidence: 99%

“…The last example will explain the role played by current modes on the microstructural and tribological characteristics of oxide coatings produced on a AM60B Mg alloy in a 7g/l K 4 P 2 O 7 + 3 g/l Na 2 Al 2 O 4 and 1 g/l KOH electrolyte [24]. A unipolar current mode gives rise to thicker (≈48 µm), more porous (amount and size) coatings with a higher surface roughness than those produced using a bipolar current mode (≈37 µm) or H1(U+B) and H2 (B+U) modes (≈30 µm) [24].…”

Section: Current Mode and Current Density Effectsmentioning

confidence: 99%

“…Many processing parameters can affect the PEO process, including electrolyte concentration and composition [10], substrate material [11], and electrical (b) (a) parameters, mainly current mode and current density [8,12]. Different current modes have been utilized in the PEO treatment including, DC, AC, unipolar, bipolar and hybrid (combination of bipolar and unipolar) current modes [13] which play important roles in the consequent voltage breakdown and discharge events, both in terms of discharge intensity and density, local melting and oxidation of the substrate, quenching and re-crystallization processes. The discharges have a profound effect on the coating microstructure, thickness, roughness, porosity, hardness, and coating growth rate, and hence affect the corrosion and wear resistance of the coated lightweight alloy.…”

Section: Introductionmentioning

confidence: 99%

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Production of high quality coatings on light alloys using Plasma Electrolytic Oxidation (PEO)

Hussein

Nie

Northwood

2016

WIT Transactions on the Built Environment

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Plasma Electrolytic Oxidation (PEO) is a high voltage plasma-assisted oxidation process which involves the creation of plasma discharges around a metal surface component immersed in an environmentally-friendly aqueous electrolyte to form ceramic oxide coatings which can, if correctly formed, impart a high corrosion and wear resistance. During PEO coating, there are three simultaneous processes taking place, namely the electrochemical reactions, the plasma chemical reactions and thermal oxygen diffusion. All PEO-coatings have a three-layer structure with a porous outer layer, and intermediate dense layer and a thin inner dense layer. It is through control of the relative amounts (thickness) and composition of these three that high quality coatings can be obtained. In this paper we describe how processing parameters including current density, current mode (unipolar, bipolar, hybrid), and electrolyte (concentration and composition) effect the quality of the coatings as measured by the corrosion and wear resistance. In general terms, an intermediate current density and a bipolar current mode lead to the most compact and high quality coatings, although the growth rate is reduced compared to using a unipolar current mode and higher current densities. The growth rate can be increased by increasing the electrolyte concentration. Incorporation of silicates and aluminates into the electrolyte can result in the formation of hard spinels in the coatings, which can then lead to better wear and corrosion resistance.

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Section: Current Mode and Current Density Effectsmentioning

confidence: 87%

Section: Plasma Discharge Effects On Microstructure Of Coating and Prmentioning

confidence: 99%

Section: Current Mode and Current Density Effectsmentioning

confidence: 99%

Section: Current Mode and Current Density Effectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Production of high quality coatings on light alloys using Plasma Electrolytic Oxidation (PEO)

Hussein

Nie

Northwood

2016

WIT Transactions on the Built Environment

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Surface modification of valve metals using plasma electrolytic oxidation for antibacterial applications: A review

Rizwan

Alias

Zaidi

et al. 2017

J Biomedical Materials Res

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Plasma electrolytic oxidation (PEO) is an advance technique to develop porous oxidation layer on light metals, primarily to enhance corrosion and wear resistance. The oxidation layer can also offer a wide variety of mechanical, biomedical, tribological, and antibacterial properties through the incorporation of several ions and particles. Due to the increasing need of antimicrobial surfaces for biomedical implants, antibacterial PEO coatings have been developed through the incorporation of antibacterial agents. Metallic nanoparticles that have been employed most widely as antibacterial agents are reported to demonstrate serious health and environmental threats. To overcome the current limitations of these coatings, there is a significant need to develop antibacterial surfaces that are not harmful for patient's health and environment. Attention of the readers has been directed to utilize bioactive glasses as antibacterial agents for PEO coatings. Bioactive glasses are well known for their excellent bioactivity, biocompatibility, and antibacterial character. PEO coatings incorporated with bioactive glasses can provide environment-friendly antimicrobial surfaces with exceptional bioactivity, biocompatibility, and osseointegration. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 590-605, 2018.

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Network Topology Model for Wear Behavior Prediction of Ti6Al4V Clad Magnesium Substrates

Kannan¹,

Revathi²,

Rajkumar³

et al. 2023

Lecture Notes in Mechanical Engineering

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A study of the interactive effects of hybrid current modes on the tribological properties of a PEO (plasma electrolytic oxidation) coated AM60B Mg-alloy

Cited by 63 publications

References 23 publications

Production of high quality coatings on light alloys using Plasma Electrolytic Oxidation (PEO)

Production of high quality coatings on light alloys using Plasma Electrolytic Oxidation (PEO)

Surface modification of valve metals using plasma electrolytic oxidation for antibacterial applications: A review

Network Topology Model for Wear Behavior Prediction of Ti6Al4V Clad Magnesium Substrates

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