Characterization of ceramic oxide coatings prepared by plasma electrolytic oxidation using pulsed direct current with different duty ratio and frequency

Lee, Jung-Hyung; Jung, Kwang-Hu; Kim, Seong-Jong

doi:10.1016/j.apsusc.2020.146049

Cited by 19 publications

(6 citation statements)

References 21 publications

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“…The morphology of PEO coatings is also suitable for the adhesion of other top coats, like sol-gel layers, while it could act as a reservoir for liquid or solid lubricants, providing self-lubricating properties [58][59][60]. Furthermore, PEO coatings exhibit high thermal resistance [61,62], superior dielectric properties [63,64], or photo-catalytical features [38,65,66]. In the biomedical industry, PEO coatings provide desirable properties such as biocompatibility [67,68], antibacterial properties [67,69], and bioactivity [70,71].…”

Section: Plasma Electrolytic Oxidation (Peo)mentioning

confidence: 99%

“…PEO electrolytes are typically categorized based on the predominant inorganic compound in their formulation, with common classifications including silicate-, aluminateand phosphate-based electrolytes. Among these, silicate-based electrolytes, with Na 2 SiO 3 being the most common reagent, are the most widely used electrolytes in PEO technology [64,137,138]. In general, silicate-based electrolytes have been found to be more stable than phosphate-based electrolytes [101].…”

Section: Electrolytementioning

confidence: 99%

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Plasma Electrolytic Oxidation (PEO) as a Promising Technology for the Development of High-Performance Coatings on Cast Al-Si Alloys: A Review

Fernández-López,

Alves,

San-Jose

et al. 2024

Coatings

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Cast Al-Si alloys, recognized for their excellent mechanical properties, constitute one of the most widely employed non-ferrous substrates in several sectors, and are particularly relevant in the transport industry. Nevertheless, these alloys also display inherent limitations that significantly restrict their use in several applications. Among these limitations, their low hardness, low wear resistance, or limited anti-corrosion properties, which are often not enough when the component is subjected to more severe environments, are particularly relevant. In this context, surface modification and the development of coatings are essential for the application of cast Al-Si alloys. This review focuses on the development of coatings to overcome the complexities associated with improving the performance of cast Al-Si alloys. Against this background, plasma electrolytic oxidation (PEO), an advanced electrochemical treatment that has revolutionized the surface modification of several metallic alloys in recent years, emerges as a promising approach. Despite the growing recognition of PEO technology, the achievement of high-performance coatings on cast Al-Si is still a challenge nowadays, for which reason this review aims to provide an overview of the PEO treatment applied to these alloys. In particular, the impact of the electrolyte chemical composition on the properties of the coatings obtained on different alloys exposed to harsh environments has been analyzed and discussed. By addressing the existing gaps and challenges, this paper contributes to a better understanding of the intricacies associated with the development of robust PEO coatings on cast Al-Si alloys.

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Section: Plasma Electrolytic Oxidation (Peo)mentioning

confidence: 99%

Section: Electrolytementioning

confidence: 99%

Plasma Electrolytic Oxidation (PEO) as a Promising Technology for the Development of High-Performance Coatings on Cast Al-Si Alloys: A Review

Fernández-López,

Alves,

San-Jose

et al. 2024

Coatings

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“…For instance, research conducted by Clyne [20], from Cambridge University, revealed that coatings with much looser microstructures could be obtained at high frequency. Similarly, Seong et al [19], from Mokpo National Maritime University, discovered that the microstructures and electrochemical properties of coatings could be dramatically changed by controlling discharge parameters. However, so far, limited studies have been reported on the effect of discharge parameters on heat capacity and heat conductivity of coatings prepared by PEO.…”

Section: Introductionmentioning

confidence: 98%

“…As PEO coatings are produced based on arc discharge in the liquid phase, their properties are closely related to discharge parameters [16][17][18][19]. For instance, research conducted by Clyne [20], from Cambridge University, revealed that coatings with much looser microstructures could be obtained at high frequency.…”

Section: Introductionmentioning

confidence: 99%

Influence of Applied Frequency on Thermal Physical Properties of Coatings Prepared on Al and AlSi Alloys by Plasma Electrolytic Oxidation

et al. 2021

Coatings

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In this study, plasma electrolytic oxidation (PEO) was performed on Al and AlSi substrates using a pulsed direct current (DC) power source. The coating process was carried out in a Na2SiO3 electrolyte with the systematic change of pulse frequency (50–1400 Hz). The surface characteristics of the coatings were examined using scanning electron microscopy (SEM). The phase structure was characterized using X-ray diffraction (XRD). A differential scanning calorimeter (DSC) and a laser flash apparatus (LFA) were employed to test heat capacity and heat conductivity, respectively. Results showed that as the discharge frequency increased, the thermal physical properties of Al-PEO and AlSi-PEO coatings changed in different ways. At a high frequency, Al-PEO coatings had low porosity and were closed-pore structured whereas AlSi-PEO coatings had high porosity and large-size open-pore structures could be observed on their surfaces due to concentrated discharges. Based on these findings, it was found that the thermal productivity of coatings is closely correlated with the open-/closed-pore structure instead of porosity. PEO coatings with low heat capacity or low heat conductivity could be obtained with a controlled frequency.

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“…Over the last few years, a number of papers investigating pulsed DC PEO processing in a microsecond range were published [7][8][9]. These papers exploited the finding that both the life of the micro-discharges and the incubation period between an individual micro-discharge and a cascade of micro-discharges are in the microsecond range [10] with the aim to influence the properties of the PEO coatings.…”

Section: Introductionmentioning

confidence: 99%

The Plasma Electrolytic Oxidation of Aluminum Using Microsecond-Range DC Pulsing

Mojsilović,

Stojadinović,

Vasilić

2023

Metals

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This manuscript presents the results of our recent work focused on the plasma electrolytic oxidation of aluminum in a sodium tungstate solution using a microsecond-range pulsed DC signal. DC pulses of 50, 300 and 900 μs were followed by 5- and 25-times longer pauses between the pulses, showing the effect of the pulse duration and duty cycle on the morphological, phase and chemical properties of formed oxide coatings. It is shown that all coatings are partially crystalline with gamma-alumina, WO3 and metallic W phases present in formed PEO coatings. A higher duty cycle value results in the higher crystallization of the obtained PEO coatings. Although the chemical composition of the obtained coatings is not very sensitive to processing parameters, their roughness and porosity change significantly, as well as their thickness. The photocatalytic activity and photoluminescence properties of the obtained coatings are dependent on their morphology and chemical composition, i.e., on the processing time. The highest photoactivity and photoluminescence intensity is observed for the coating formed with ton = 300 μs and toff = 25 ton. A comparable application potential is found for the sample processed with ton = 50 μs and toff = 25 ton, which requires considerably less energy for PEO processing.

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Characterization of ceramic oxide coatings prepared by plasma electrolytic oxidation using pulsed direct current with different duty ratio and frequency

Cited by 19 publications

References 21 publications

Plasma Electrolytic Oxidation (PEO) as a Promising Technology for the Development of High-Performance Coatings on Cast Al-Si Alloys: A Review

Plasma Electrolytic Oxidation (PEO) as a Promising Technology for the Development of High-Performance Coatings on Cast Al-Si Alloys: A Review

Influence of Applied Frequency on Thermal Physical Properties of Coatings Prepared on Al and AlSi Alloys by Plasma Electrolytic Oxidation

The Plasma Electrolytic Oxidation of Aluminum Using Microsecond-Range DC Pulsing

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