Particle Size Influences on the Coating Microstructure through Green Chromia Inclusion in Plasma Electrolytic Oxidation

Liu, Chen-Yu; Tsai, Dah–Shyang; Wang, Jian-Mao; Tsai, James T. J.; Chou, Chen–Chia

doi:10.1021/acsami.7b03113

Cited by 24 publications

(11 citation statements)

References 47 publications

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“…Optical properties pertaining to absorption in the visible spectrum are of greater interest since they decide the color of the coated surface. PEO experiments have generated yellow [ 65 ], green [ 193 , 194 ], grey [ 195 ], red [ 196 ], blue [ 197 ], black [ 198 , 199 ], and other coating colors. A study has been conducted to fabricate a porous and rough ceramic coating that could reflect active or passive infrared rays [ 200 ].…”

Section: Impact Of Environmental Conditionsmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Impact Of Environmental Conditionsmentioning

confidence: 99%

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

et al. 2021

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“…Anodizing is commonly carried out in acidic solutions, with an imposed voltage sufficiently low such that electric discharges did not occur. When the imposed voltage is raised to a point that electric discharges emerge and travel on the metal surface, the processing enters the phase of PEO [1][2][3][4][5]. However, the division between anodizing and PEO may not be as clear-cut as described.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Defect Density and Corrosion Parameter of Electrochemically Oxidized Aluminum

2019

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It has been recognized that a connection may exist between defects of oxide coating and its corrosion protection. Such a link has not been substantiated. We prepare two coatings of anodized aluminum oxide (AAO) and plasma electrolytic oxidation (PEO), and analyze them with Mott-Schottky plots and potentiodynamic polarization scans. The as-grown and annealed AAO coatings exhibit both p-type and n-type semiconductor behaviors. Polarization resistance of the AAO coating increases from (1.8 ± 1.7) × 108 to (4.3 ± 0.5) × 108 Ω·cm2, while corrosion current decreases from (6.1 ± 3.6) × 10−7 to (2.3 ± 0.9) × 10−7 A·cm−2, as annealing temperature increases from room temperature to 400 °C. The parameter analysis on AAO indicates a positive correlation between corrosion current and donor density, a negative correlation between polarization resistance and donor density. The attempt on correlating corrosion potential gives rise to considerable deviation from a linear fit. The results suggest protection of AAO hinges on its donor density, not acceptor. On the PEO coatings, only the n-type behavior is observed. Intriguingly, the donor density of PEO coating is influenced by the annealing temperature of its pre-anodized layer. The most resistant PEO coating, with pre-anodized and 400 °C annealed AAO, exhibits polarization resistance (2.1 ± 0.4) × 109 Ω·cm2 and corrosion current (1.7 ± 0.4) × 10−8 A·cm−2.

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“…Features of the formation of coatings by plasma electrolytic oxidation suggest the presence of outer porous and inner barrier layers. The porosity of PEO coatings varies from 5 to 50%, and the pore size changes from 0.01 to 10 µm [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ]. Thus, the anticorrosive properties of coatings are determined by the characteristics of a dense barrier sublayer at the alloy/coating interface, namely its thickness, defectiveness, and composition.…”

Section: Introductionmentioning

confidence: 99%

Features of Composite Layers Created Using an Aqueous Suspension of a Fluoropolymer

et al. 2022

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This paper presents a method for the formation of composite-polymer-containing coatings on MA8 Mg alloy by plasma electrolytic oxidation (PEO), followed by the deposition of a fluoropolymer from an aqueous suspension of superdispersed polytetrafluoroethylene. The Scanning Electron Microscope(SEM), Energy Dispersive Spectroscopy(EDS), and X-ray Diffraction(XRD) analyses established morphological features as well as elemental and phase composition of composite coatings. The fact that the pores are filled with a fluoropolymer has been experimentally confirmed. An assessment of the corrosion properties of formed composite coatings revealed a decrease in the corrosion current density by more than four orders of magnitude in comparison with the base PEO layer. The highest resistance to the damaging effects of a corrosive environment, according to the results of long-term exposure tests, was demonstrated by coatings after three treatments with polytetrafluoroethylene. The obtained polymer-containing coatings have antifriction properties, reducing the wear of the coatings by more than 27-fold in comparison with the base PEO layer. It was revealed that composite coatings have superhydrophobic properties: the value of the contact angle reaches 154°, and the hysteresis of the contact angle is less than 10°.

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Particle Size Influences on the Coating Microstructure through Green Chromia Inclusion in Plasma Electrolytic Oxidation

Cited by 24 publications

References 47 publications

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

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

Correlation between Defect Density and Corrosion Parameter of Electrochemically Oxidized Aluminum

Features of Composite Layers Created Using an Aqueous Suspension of a Fluoropolymer

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