Correlation between current frequency and electrochemical properties of Mg alloy coated by micro arc oxidation

Hwang, Insung; Hwang, Duck Young; Ko, Young Gun; Shin, Dong Hyuk

doi:10.1016/j.surfcoat.2012.01.041

Cited by 57 publications

(23 citation statements)

References 25 publications

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“…9). The corrosion current densities are up to one order lower in comparison with current densities on PEO layers recently reported by Liu et al [27] and in the same range as published by Hwang et al [30]. However, it has to be remarked that the chloride concentration as well as the PEO layer thickness in the aforementioned literature was different to the present work, which complicates the comparison.…”

Section: Materials Diagnosticcontrasting

confidence: 50%

“…11). This type of equivalent circuit is commonly used in PEO coated magnesium (see, e.g., [19,[28][29][30]), whereby the capacitances are usually substituted by constant phase elements (CPE).…”

Section: Electrochemical Behaviormentioning

confidence: 99%

“…C1 is frequently interpreted as a capacitance of the plasmaelectrolytic formed oxide layer or the porous outer part of it and C2 as capacitance of an inner layer or a double layer capacitance [28][29][30][31]. However, the quantitative values vary in the order of magnitudes and are often only scarcely discussed [30,31]. This can be partly explained as varying coating thicknesses are difficult to understand.…”

Section: Electrochemical Behaviormentioning

confidence: 99%

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Corrosion protection of thickness reduced plasma electrolytic layers on AZ31

Schneider

Kremmer

Höhn

2016

Materials & Corrosion

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In the present study plasma electrolytic oxidation of magnesium in fluoride free alkaline solution were used to form thin oxide layers with high corrosion protection. The relation between potassium hydroxide and sodium silicate was varied in the electrolyte. The plasma electrolytic process was performed as current controlled unipolar pulse technique. The microstructure of the formed layers were investigated by X-ray diffraction and scanning electron microscopy. The electrochemical behavior was studied by linear sweep voltammetry and impedance spectroscopy. The thickness of the formed oxide layers was in the range of 1–2 µm. The surface morphology strictly depends on the electrolyte composition. Oxide layers formed in an electrolyte with the lowest relation KOH: Na2SO3 show the best performance in view of corrosion protection

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Section: Materials Diagnosticcontrasting

confidence: 50%

Section: Electrochemical Behaviormentioning

confidence: 99%

Section: Electrochemical Behaviormentioning

confidence: 99%

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Corrosion protection of thickness reduced plasma electrolytic layers on AZ31

Schneider

Kremmer

Höhn

2016

Materials & Corrosion

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“…Such an approach can also provide guidance on how to adjust current pulse parameters in order to control the reactive component of the current with changing impedance of 31 the system. Moreover this could be useful to achieve a better understanding of frequency effects that are commonly observed and studied in AC and pulsed current EPPs [56,76,[135][136][137][138][139][140][141], yielding partial and often controversial inferences.…”

Section: Frequency Response Modellingmentioning

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

160

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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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“…Recently, prepared TiO 2 ceramic coating has been proposed as a novel surface modification technology called micro-arc oxidation (MAO) [13]. Most investigations mainly focused on the influence of voltage on the MAO process, whereas others have indicated that the current density also has a significant effect on the MAO process [14][15][16][17]. Moreover, to improve the performance of MAO coatings further, nanoparticles such as ZrO 2 [18], Al 2 O 3 [19], and TiO 2 [20] are added in the electrolyte to form composite films.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of rare earth CeO2-doped TiO2 nanostructured composite coatings through micro-arc oxidation

Guo

et al. 2015

Ceramics International

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Correlation between current frequency and electrochemical properties of Mg alloy coated by micro arc oxidation

Cited by 57 publications

References 25 publications

Corrosion protection of thickness reduced plasma electrolytic layers on AZ31

Corrosion protection of thickness reduced plasma electrolytic layers on AZ31

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

Microstructure and properties of rare earth CeO2-doped TiO2 nanostructured composite coatings through micro-arc oxidation

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