Intelligent Automated System of Controlled Synthesis of MAO-Coatings

Golubkov, P. E.; Pecherskaya, E. A.; Karpanin, O. V.; Safronov, Maksim I.; Shepeleva, J. V.; Bibarsova, Aliya

doi:10.23919/fruct.2019.8711874

Cited by 14 publications

(5 citation statements)

References 26 publications

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“…Figure a illustrates the typical evolution patterns of the two peak cell voltages during the PEO treatment, with transition to soft sparking manifested in the noticeable drop in the anodic voltage magnitude U A , which is usually observed between 20 and 30 min into processing. Figure b shows a typical microstructure of the produced coating and distributions of the chemical elements of interest, that is, Al, O, and H, across the surface layer, indicating a local increase in hydrogen content at the metal–oxide interface, which might be associated with the development of CICs in the active reaction zone of the growing oxide layer …”

Section: Resultsmentioning

confidence: 99%

“…One of the important problems in the industrial application of PEO processes is the high number of processing variables associated with bipolar polarization, which makes optimization of PEO treatments rather laborious and complicated. Some authors suggest developing a database which would include information about processing parameters and the resulting coating properties to find appropriate conditions for processing new articles using machine learning algorithms. − However to the best of our knowledge, no successful implementation of such big data strategies has so far been reported, with heuristic (e.g., trial-and-error) approaches remaining commonly used in the optimization of PEO processes, causing dramatic costs of research and development. In such circumstances, personal competence, including professional experience and sometimes intuition, play a major role in the design and engineering of PEO coatings, which cannot be directly implemented within the smart manufacturing concept because of difficulties in formalization of personal competence.…”

Section: Introductionmentioning

confidence: 99%

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Relaxation Kinetics of Plasma Electrolytic Oxidation Coated Al Electrode: Insight into the Role of Negative Current

2020

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Plasma electrolytic oxidation (PEO) is an advanced coating process based on high-voltage anodizing. Notwithstanding the anodic nature of the PEO process, it is known that negative polarization leads to synergetic effects in oxide formation efficiency and characteristics of resulting coatings. In this work, we used dynamic anodic voltammograms derived from polarization signal, combining working and diagnostic segments to evaluate in real time the effects of negative polarization on the formation of PEO on the coating on Al in the bipolar regime with a frequency of 50 Hz and a negative-to-positive charge ratio of 1.3. It was found that the hysteresis between ascending and descending branches of the voltammogram can be both caused by prior cathodic polarization and spontaneously generated under unpolarized conditions. This indicated the existence of a quasi-equilibrium in the chemical state of the coating material, which could be perturbed by the external bipolar polarization. The characteristic relaxation time for this system was found to be 40–370 ms. The quasi-equilibrium was attributed to a reversible hydration/dehydration reaction taking place in the active zone of anodic alumina layer (degree of hydration: 10–40%). Coating response analysis via kinetic hydration model allowed both explanations to be provided to a number of previous experimental observations and practical recommendations to be made for the design of efficient electrical regimes for intelligent PEO processes. The latter includes recommendations on avoiding long pauses during negative to positive switching.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relaxation Kinetics of Plasma Electrolytic Oxidation Coated Al Electrode: Insight into the Role of Negative Current

2020

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“…Based on quality control methods, Pareto diagrams and Ishikawa's causal diagram have been developed to identify the main causes of damage to overhead lines. These methods are used to assess, control and improve the quality of production processes by identifying the main reasons that have a significant impact on the reliability and quality of operation (figure 2) [9][10][11][12][13]. When developing a structural diagram of the proposed information-measuring system for monitoring the overhead power lines parameters, the methods of the electrical circuits theory, circuitry, metrological analysis were used.…”

Section: Methodsmentioning

confidence: 99%

Systematization and monitoring of quality parameters of overhead power transmission lines functioning

Listyukhin

Pecherskaya

Safronova

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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On the basis of quality control methods, the analysis of the causes of technological disturbances (accidents) on overhead power lines was carried out. In particular, the Ishikawa diagram, the Pareto diagram were developed, which made it possible to systematize the main causes of technological violations. The necessity of monitoring the indicators of the reliability of the functioning of overhead power transmission lines by means of information-measuring systems has been substantiated. The structure of an information-measuring system for monitoring parameters that have a negative impact on the functioning quality of overhead power transmission lines is proposed. The proposed system is aimed at ensuring the reliability of the electrical networks operation and improving the quality indicators of services provided to consumers for the transmission of electrical energy.

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“…However, the considered oxidation method is characterized by heterogeneous factors that collectively affect the quality parameters of coatings [12], which indicates the need for their analytical description in order to establish optimal control technological effects. In addition, the imperfection of technological equipment and means of measuring the parameters of coatings in real time limit the widespread industrial introduction of microarc oxidation [13,14]. This article presents the results of an analysis of the current density and electrolyte composition effect, which made it possible to develop criteria for assessing the coatings quality by analyzing the electrical characteristics of the micro-arc oxidation method.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the current density and electrolyte composition influence on the quality of micro-arc coatings

Pecherskaya,

Li,

Zhurina

et al. 2024

J. Phys.: Conf. Ser.

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The results of an experimental study of oxide coatings obtained using an automated system developed by the authors in the anode-cathode mode at a ratio of the anode current to the cathode current equal to 1, at low current (0.125 A or 0.25 A) with different electrolyte composition are presented. An analysis of the dependence of the quality of the obtained coatings on the molding curves, which characterize the change in the electrical voltage on the samples depending on the time of their processing was made. It has been established that with increasing current density, the process is more intense, microdischarges begin to burn earlier, and, in general, the coating quality increases. However, at too high current densities (50 A/dm2), it is undesirable to carry out micro-arc oxidation treatment due to an increase in the coating roughness. In particular, it is expedient to use the results obtained for quality control of the technological mode under production conditions: the coating has inadequate quality if the molding curve has a distorted shape. The results obtained have been tested in the implementation of the method of formation by microarc oxidation of oxide coatings with specified properties.

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Intelligent Automated System of Controlled Synthesis of MAO-Coatings

Cited by 14 publications

References 26 publications

Relaxation Kinetics of Plasma Electrolytic Oxidation Coated Al Electrode: Insight into the Role of Negative Current

Relaxation Kinetics of Plasma Electrolytic Oxidation Coated Al Electrode: Insight into the Role of Negative Current

Systematization and monitoring of quality parameters of overhead power transmission lines functioning

Analysis of the current density and electrolyte composition influence on the quality of micro-arc coatings

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