Microarc oxidation of magnesium alloys: A review

Vladimirov, B. V.; Крит, Б. Л.; Lyudin, V. B.; Morozova, N. V.; Rossiiskaya, A. D.; Суминов, И. В.; Эпельфельд, А. В.

doi:10.3103/s1068375514030090

Cited by 67 publications

(21 citation statements)

References 46 publications

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“…With the SCR thickness usually being less than a micron, the electric field there at voltages typically applied in EP treatments can reach breakdown values (~ 10 7 V/cm) [33]. PEO treatments can therefore be easily implemented to grow protective coatings on the valve metals [2,58]. For other metals, such as Fe, Cr, Ni, W, Cu etc., that either form p-type oxide films (3) or do not form stable oxides at all (2), high anodic potentials result in VGE formation, promoting non-oxidising treatments, e.g.…”

Section: Metal Substrate Type and The Main Voltage Drop In The Systemmentioning

confidence: 99%

Towards smart electrolytic plasma technologies: An overview of methodological approaches to process modelling

Парфенов

Yerokhin

Nev’yantseva

et al. 2015

Surface and Coatings Technology

158

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Article:Parfenov, E.V., Yerokhin, A., Nevyantseva, R. ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract This paper reviews the present understanding of electrolytic plasma processes (EPPs) and approaches to their modelling. Based on the EPP type, characteristics and classification, it presents a generalised phenomenological model as the most appropriate one from the process diagnostics and control point of view. The model describes the system 'power supply -electrolyser -electrode surface' as a system with lumped parameters characterising integral properties of the surface layer and integral parameters of the EPP. The complexity of EPPs does not allow the drawing of a set of differential equations describing the treatment, although a model can be formalised for a particular process as a black box regression. Evaluation of dynamic properties reveals the multiscale nature of electrolytic plasma processes, which can be described by three time constants separated by 2-3 orders of magnitude (minutes, seconds and milliseconds), corresponding to different groups of characteristics in the model. Further developments based on the phenomenological approach and providing deeper insights into EPPs are proposed using frequency response methodology and electromagnetic field modelling. Examples demonstrating the efficiency of the proposed approach are supplied for EPP modelling with static and dynamic neural networks, frequency response evaluations and electromagnetic field calculations.

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Section: Metal Substrate Type and The Main Voltage Drop In The Systemmentioning

confidence: 99%

Towards smart electrolytic plasma technologies: An overview of methodological approaches to process modelling

Парфенов

Yerokhin

Nev’yantseva

et al. 2015

Surface and Coatings Technology

158

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“…[1][2][3][4][5][6] Among several types of surface treatments, anodization with spark discharges at a high voltage (so-called plasma electrolytic oxidation (PEO) or micro-arc oxidation (MAO)) is expected to improve the corrosion resistance of magnesium and its alloys. [7][8][9] In the PEO process for magnesium alloys, alkaline solutions containing phosphate, [10][11][12][13] silicate, [14][15][16] mixtures of phosphate and silicate, [17][18][19] or uoride [20][21][22][23] are generally used. In recent years, the PEO process in an electrolyte containing various particles as additives has also been studied extensively as an approach for improving lm properties.…”

Section: Introductionmentioning

confidence: 99%

“…For details of corrosion resistance of the PEO lms, see review papers. 8,9 Recently, we investigated the microstructures and corrosion resistance of the anodic oxide lms formed on AZ31B magnesium alloy by direct current (DC) anodization under continuous sparking in alkaline phosphate electrolyte. [27][28][29] In our previous studies, we found that the microstructures (e.g., diameter and number of pores/spherical cavities) of the anodic lms formed under sparking were strongly affected not only by the formation voltage itself but also by the degree of sparking, in particular, the size, number, and appearance frequency of sparks.…”

Section: Introductionmentioning

confidence: 99%

Effect of alcohol addition on the structure and corrosion resistance of plasma electrolytic oxidation films formed on AZ31B magnesium alloy

2020

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“…However, the cold spray process requires a specialized coating facility and is difficult to apply on substrates of complex shapes. Among the various coating technologies for treating magnesium alloys, microarc oxidation (MAO), developed from conventional anodic oxidation, has commonly been applied for years to form a hard ceramic coating on Al, Ti, Mg, and their alloys . The MAO process can be used to treat parts of complex shapes and it produces outstanding in situ‐grown ceramic‐like oxide coatings on magnesium alloys, which are thick, hard, and adhesive to the substrate with high corrosion resistance .…”

Section: Introductionmentioning

confidence: 99%

Characterization of the corrosion performances of as‐cast Mg–Al and Mg–Zn magnesium alloys with microarc oxidation coatings

Xue

Pang

Jiang

et al. 2019

Materials & Corrosion

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In the present study, corrosion-protective microarc oxidation (MAO) coatings were prepared on AZ31B, AZ80, and ZK60 cast magnesium alloy substrates in an alkaline silicate electrolyte. The corrosion performances of the uncoated and MAO-coated alloys were investigated using electrochemical and salt spray chamber corrosion tests. The microstructure characterization and experimental results show that among the three alloys studied, the ZK60 Mg alloy exhibited the best and AZ31B the least corrosion resistance under the salt spray conditions. The MAO coating provided robust corrosion protection of the Mg substrates and resulted in a significant decrease in the corrosion rate of the alloys by 3-4 orders of magnitude. The MAO coating on ZK60 alloy showed better corrosion protectiveness than that on the AZ series alloys due to the incorporation of different alloying elements in the coating, especially the Zn and Al elements, which are from the Mg substrate. The corrosion performances and mechanisms of the uncoated and MAO-coated Mg alloys are interpreted in terms of the microstructure and phase/chemical compositions of both the substrates and coatings. K E Y W O R D S electrochemical testing, magnesium alloys, microarc oxidation, salt spray corrosion test

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Microarc oxidation of magnesium alloys: A review

Cited by 67 publications

References 46 publications

Towards smart electrolytic plasma technologies: An overview of methodological approaches to process modelling

Towards smart electrolytic plasma technologies: An overview of methodological approaches to process modelling

Effect of alcohol addition on the structure and corrosion resistance of plasma electrolytic oxidation films formed on AZ31B magnesium alloy

Characterization of the corrosion performances of as‐cast Mg–Al and Mg–Zn magnesium alloys with microarc oxidation coatings

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