Advanced plasma electrolysis research equipment with in-situ process diagnostics

Mukaeva, V. R.; Gorbatkov, M. V.; Фаррахов, Р. Г.; Лазарев, Д. М.; Stotskiy, Andrey; Парфенов, Е.В.

doi:10.1109/icoecs50468.2020.9278498

Cited by 5 publications

(7 citation statements)

References 10 publications

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“…No-filler epoxy glue was used as a dielectric acoustic couplant; AES is band piezoelectric sensor П111-(0.02-0.3) (Russia); PA is 2-cascade broadband filter amplifier MSAE-FA010 (Russia); ADC is 4-channel 12-bit Advantech PCI-1714 board (Taiwan); ID is 2-cascade broadband preamplifier with zero gain (own make). The results of approbation demonstrated the operability of this measurement circuit with the possibility of amplifying acoustic signals without increasing the level of electrical crosstalk that unavoidably accompany measurements during PEO and that prevailed over the level of AE signals in other measurement circuits reviewed (AE registration through a bath [3]; through the air with a microphone [6]; through a waveguide welded to the specimen; immersionally, by immersion of the insulated AES in a bath). The operability of the proposed measurement circuit was confirmed using a calibrated acoustic pulse generator MSAE-UCA01 (Russia) according to technique [8].…”

Section: Experimental Materials and Methodsmentioning

confidence: 89%

“…Many authors noted [2][3][4][5][6] that in order to obtain high-quality PEO oxide layers on non-ferrous alloys it is necessary to monitor the oxidation process in situ at the structural level. Concurrently, the problem is most vital for PEO of casing-type products with a complex shape (cylinder blocks, compressor housings, etc.…”

Section: Introductionmentioning

confidence: 99%

“…One of the promising methods for PEO mode monitoring may be the acoustic emission (AE) method [7]. Yet a very limited number of papers are devoted directly to AE diagnostics of PEO [3,6] and were successful in proving experimentally that there is a primary correlation of AE nature with PEO electrical mode. Presently, there is almost no understanding of the nature and features of AE at the main stages of oxide layer formation in PEO on various alloys.…”

Section: Introductionmentioning

confidence: 99%

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Regularities and features of acoustic emission under plasma electrolytic oxidation of wrought Al-Mg alloy

Растегаев

Polunin

2021

J. Phys.: Conf. Ser.

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The paper highlights the characteristic features of acoustic emission (AE) in the process of plasma electrolytic oxidation (PEO) of aluminum alloy, and also reveals the correlation of 4 main stages of PEO process with AE signals. The fundamental possibility to establish and detail the features of oxidation stages and to compare different PEO modes by AE signals was demonstrated. The results obtained substantiate the high potential of AE method as an instrument of in situ research, production monitoring and control, and evaluation of quality of PEO process on aluminum alloys.

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Section: Experimental Materials and Methodsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Regularities and features of acoustic emission under plasma electrolytic oxidation of wrought Al-Mg alloy

Растегаев

Polunin

2021

J. Phys.: Conf. Ser.

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“…We used the PEO equipment (USATU, Ufa, Russia) in pulsed unipolar mode [ 37 ]. The pulse amplitude was 480 V, frequency 700 Hz, duty cycle 26%.…”

Section: Methodsmentioning

confidence: 99%

Plasma Electrolytic Oxidation of Zr-1%Nb Alloy: Effect of Sodium Silicate and Boric Acid Addition to Calcium Acetate-Based Electrolyte

et al. 2022

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This work aimed at the development of wear and corrosion resistant oxide coatings for medical implants made of zirconium alloy, by plasma electrolytic oxidation (PEO). The effect of sodium silicate and boric acid addition to calcium acetate electrolyte on the coating properties was studied. Different aspects of the PEO coating were investigated: microstructure, electrochemical and wear behavior, wettability and apatite-forming ability. The resultant coatings consist of a dense inner layer 1.4–2.2 µm thick and a porous outer layer. The total thickness of the coating is 12–20 µm. It was found that the coating contains the tetragonal zirconia (70–95%). The obtained coatings show high corrosion resistance and reduce the surface corrosion current by 1–3 orders of magnitude, depending on the electrolyte additive, compared to the uncoated surface. The addition of boric acid to the electrolyte significantly increases the wear resistance of the coating and reduces the coefficient of friction. In terms of the combination of the coating characteristics, the electrolyte with the addition of the alkali and boric acid is recommended as the most effective.

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“…In situ impedance spectroscopy was performed in separate PEO experiments with the frequency sweep according to the method described elsewhere [ 36 , 43 , 44 ]. The equipment details and calibration have been previously discussed [ 45 ]. A step scan was used in the range from 20 Hz to 10 kHz.…”

Section: Methodsmentioning

confidence: 99%

Investigation of Biocompatible PEO Coating Growth on cp-Ti with In Situ Spectroscopic Methods

et al. 2021

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The problem of the optimization of properties for biocompatible coatings as functional materials requires in-depth understanding of the coating formation processes; this allows for precise manufacturing of new generation implantable devices. Plasma electrolytic oxidation (PEO) opens the possibility for the design of biomimetic surfaces for better biocompatibility of titanium materials. The pulsed bipolar PEO process of cp-Ti under voltage control was investigated using joint analysis of the surface characterization and by in situ methods of impedance spectroscopy and optical emission spectroscopy. Scanning electron microscopy, X-ray diffractometry, coating thickness, and roughness measurements were used to characterize the surface morphology evolution during the treatment for 5 min. In situ impedance spectroscopy facilitated the evaluation of the PEO process frequency response and proposed the underlying equivalent circuit where parameters were correlated with the coating layer properties. In situ optical emission spectroscopy helped to analyze the spectral line evolutions for the substrate material and electrolyte species and to justify a method to estimate the coating thickness via the relation of the spectral line intensities. As a result, the optimal treatment time was established as 2 min; this provides a 9–11 µm thick PEO coating with Ra 1 µm, 3–5% porosity, and containing 75% of anatase. The methods for in-situ spectral diagnostics of the coating thickness and roughness were justified so that the treatment time can be corrected online when the coating achieves the required properties.

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Advanced plasma electrolysis research equipment with in-situ process diagnostics

Cited by 5 publications

References 10 publications

Regularities and features of acoustic emission under plasma electrolytic oxidation of wrought Al-Mg alloy

Regularities and features of acoustic emission under plasma electrolytic oxidation of wrought Al-Mg alloy

Plasma Electrolytic Oxidation of Zr-1%Nb Alloy: Effect of Sodium Silicate and Boric Acid Addition to Calcium Acetate-Based Electrolyte

Investigation of Biocompatible PEO Coating Growth on cp-Ti with In Situ Spectroscopic Methods

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