The review describes recent progress on understanding and quantification of the various phenomena that take place during plasma electrolytic oxidation, which is in increasing industrial use for pro...

https://www.tandfonline.com/doi/pdf/10.1080/09506608.2018.1466492

A review of recent work on discharge characteristics during plasma electrolytic oxidation of various metals

Plasma electrolytic oxidation (PEO) is a novel surface treatment process to produce thick, dense metal oxide coatings, especially on light metals, primarily to improve their wear and corrosion resistance. The coating manufactured from the PEO process is relatively superior to normal anodic oxidation. It is widely employed in the fields of mechanical, petrochemical, and biomedical industries, to name a few. Several investigations have been carried out to study the coating performance developed through the PEO process in the past. This review attempts to summarize and explain some of the fundamental aspects of the PEO process, mechanism of coating formation, the processing conditions that impact the process, the main characteristics of the process, the microstructures evolved in the coating, the mechanical and tribological properties of the coating, and the influence of environmental conditions on the coating process. Recently, the PEO process has also been employed to produce nanocomposite coatings by incorporating nanoparticles in the electrolyte. This review also narrates some of the recent developments in the field of nanocomposite coatings with examples and their applications. Additionally, some of the applications of the PEO coatings have been demonstrated. Moreover, the significance of the PEO process, its current trends, and its scope of future work are highlighted.

Plasma Electrolytic Oxidation (PEO) Process-Processing, Properties, and Applications.

Surface characterization and corrosion behavior of calcium phosphate-base composite layer on titanium and its alloys via plasma electrolytic oxidation: A review paper.

Corrosion properties of plasma electrolytic oxidation coatings on an aluminium alloy – The effect of the PEO process stage

Plasma electrolytic oxidation (PEO) coatings with incorporated α-Al2O3 particles were formed on 6082-T6 alloy. Effects of particle concentration on phase composition and wear behaviour were investigated. Tribological performance was compared with that of electrolytic hard chrome. Results suggested that α-Al2O3 particles are incorporated into the outer layer of the coatings either by deposition, electrophoresis or mechanical entrapment by the material ejected from the discharge channels. As a result, the outer layer shows lower porosity and increased hardness. Friction coefficients of untreated 6082-T6 alloy and hard chrome coating remained relatively unaffected as the normal load increased from 2 to 10 N. Friction coefficients of PEO coatings slightly increased with the applied load and were similar or slightly higher than those of hard chrome. PEO coatings with incorporated α-Al2O3 particles showed the lowest wear volumes among all tested materials, suggesting that they could be a promising alternative to hard chrome coatings.

Characterization and wear behaviour of PEO coatings on 6082-T6 aluminium alloy with incorporated α-Al2O3 particles

Plasma electrolytic oxidation of 2024-T3 aluminum alloy and investigation on microstructure and wear behavior

Investigation on the corrosion behaviour and microstructure of 2024-T3 Al alloy treated via plasma electrolytic oxidation

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Plasma electrolytic oxidation of 2024-T3 aluminum alloy and investigation on microstructure and wear behavior

Investigation on the corrosion behaviour and microstructure of 2024-T3 Al alloy treated via plasma electrolytic oxidation