Study of the Effect of Current Pulse Frequency on Ti-6Al-4V Alloy Coating Formation by Micro Arc Oxidation

Sobolev, Alexander; Kossenko, Alexey; Borodianskiy, Konstantin

doi:10.3390/ma12233983

Cited by 41 publications

(16 citation statements)

References 27 publications

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“…Usually, PEO treatment is conducted in an aqueous electrolyte made of silicates, phosphates, aluminates, fluorides, and other [7][8][9][10][11][12]. Recently, we have showed a possible implementation of the electrolyte of the molten salt in the PEO process [13][14][15]. Results of these works evaluated the formation of a denser coating free of any contaminants in comparison with a traditional method, which is usually obtained in an aqueous electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Ceramic Coating on Al7075 Alloy by Plasma Electrolytic Oxidation in Molten Salt

2020

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The fabrication of a ceramic coating on the metallic substrate is usually applied to achieve the improved performance of the material. Plasma electrolytic oxidation (PEO) is one of the most promising methods to reach this performance, mostly wear and corrosion resistance. Traditional PEO is carried out in an aqueous electrolyte. However, the current work showed the fabrication and characterization of a ceramic coating using PEO in molten salt which was used to avoid disadvantages in system heating-up and the formation of undesired elements in the coating. Aluminum 7075 alloy was subjected to the surface treatment using PEO in molten nitrate salt. Various current frequencies were applied in the process. Coating investigations revealed its surface porous structure and the presence of two oxide layers, α-Al2O3 and γ-Al2O3. Microhardness measurements and chemical and phase examinations confirmed these results. Potentiodynamic polarization tests and electrochemical impedance spectroscopy revealed the greater corrosion resistance for the coated alloy. Moreover, the corrosion resistance was increased with the current frequency of the PEO process.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Ceramic Coating on Al7075 Alloy by Plasma Electrolytic Oxidation in Molten Salt

2020

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“…the surface modification of aluminum, magnesium and titanium alloys based on the electrical breakdown of the metallic-oxide-coated anode under a significantly high pulse voltage [1]. The properties of MAO coatings are normally related to both electrolytic and electric parameters, such as electrolyte compositions and concentrations [2] [3], applied pulse frequency [4], average current density [5] and treatment time [6].…”

Section: Micro-arc Oxidation (Mao) Has Been An Attractive Electrochem...mentioning

confidence: 99%

Discharge Characteristic of Micro-Arc Oxidation on Aluminum Alloy under the Changing Electrolyte Temperature

Yang¹,

Wang²,

Zhu³

et al. 2022

MSCE

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The electrolyte temperature has a great influence on the performance of the coating prepared by micro-arc oxidation (MAO). The behavior of MAO discharge in the changing electrolyte temperature has been investigated. Compared to constant electrolyte temperature in conventional MAO process, the process has different discharge characteristics under the changing electrolyte temperature. The amplitude of pulse voltage was detected to study the change of discharge characteristic under the constant-current control of MAO power supply. Three successive discharge stages were differentiated by the variable the pulse voltage versus process time. Since there were significant changes in the sound, the sound signals were acquired and the audio analysis was used to describe the changing of the MAO discharge at different stages. Optical emission spectroscopy (OES) was employed in situ to unveil how the micro-discharge changed with the temperature increasing. Scanning electron microscopy (SEM) was used to characterize the morphology of the coatings on 6N01 aluminum alloy prepared by normal process with the constant-temperature control of the MAO electrolyte and by the process under the changing electrolyte temperature. A mode of film growth and microdischarge was given to describe the effects of the changing electrolyte temperature in the whole MAO process.

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“…The chemical composition, hydrophilicity, morphology, and surface roughness in this case are key factors for the active interaction of the implant with bone tissue and subsequent osseointegration [9,10]. Surface modification methods such as plasma spraying [11][12][13][14][15], alkali treatment [16][17][18][19][20], acid etching [21][22][23][24], laser treatment [25][26][27][28], and anodizing [29][30][31] are used, as well as the increasingly widely used plasma-electrolytic method of microarc oxidation (MAO) [32][33][34][35][36]. MAO is commonly used to produce useful coatings with various oxide layers on the surface of various metals, such as Ti, Al, Mg and Zr and their alloys, to improve corrosion resistance, tribological properties, biocompatibility and thermal properties [37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Investigation of MAO Coatings Characteristics on Titanium Products Obtained by EBM Method Using Additive Manufacturing

et al. 2022

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Coatings with a thickness from 27 to 62 µm on electron beam melted Ti-6Al-4V have been formed by micro-arc oxidation (MAO) in a silicate-hypophosphite electrolyte. MAO tests in the anode-cathode mode (50 Hz) with an anode-to-cathode current ratio of 1:1 and sum current densities 10 and 20 A/dm2 were carried out. The duration of the MAO treatment was 30 and 60 min. The effect of the processing parameters on the structural properties of the MAO treated coatings was studied. The current density and treatment time significantly affect the coating thickness and surface roughness. The values of these characteristics increase as the current density increases. The effect of thermal cycling tests on surface morphology, thickness and roughness, and elemental and phase composition of MAO coatings was analyzed. After 50 cycles of thermal cycling from +200 °C to −50 °C, no cracking or delamination of coatings was observed. Coatings formed in 30 min at a current density of 20 A/dm2 turned out to be the best in terms of such indicators as surface morphology, thickness, and roughness.

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Study of the Effect of Current Pulse Frequency on Ti-6Al-4V Alloy Coating Formation by Micro Arc Oxidation

Cited by 41 publications

References 27 publications

Fabrication and Characterization of Ceramic Coating on Al7075 Alloy by Plasma Electrolytic Oxidation in Molten Salt

Fabrication and Characterization of Ceramic Coating on Al7075 Alloy by Plasma Electrolytic Oxidation in Molten Salt

Discharge Characteristic of Micro-Arc Oxidation on Aluminum Alloy under the Changing Electrolyte Temperature

Investigation of MAO Coatings Characteristics on Titanium Products Obtained by EBM Method Using Additive Manufacturing

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