Micro-arc oxidation of AZ91 Mg alloy: An in-situ electrochemical study

Veys‐Renaux, Delphine; Rocca, Emmanuel; Henrion, G.

doi:10.1016/j.elecom.2013.02.023

Cited by 48 publications

(24 citation statements)

References 21 publications

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“…proposed by the authors in [86] and later used elsewhere [129]. 28 Ultimately, using this approach to bridge between plasma physics, materials science, electrochemistry, electrical engineering, computational mathematics and computer science would contribute to the development of smart electrolytic plasma technologies capable of addressing key challenges of modern manufacturing.…”

Section: Perspective On Phenomenological Modelling and Research Of Elmentioning

confidence: 99%

“…27 The other important research direction is development of electrical, optical and acoustical methods for process diagnostics and incorporation of corresponding characteristics of into EPP models. This includes frequency response interpretations [128,129], statistical spectral analysis of electrochemical noise in the voltage and current [130], microdischarge image analysis [131], spectral analyses of optical [93,116] and acoustic emission [96]. These analyses should lead to identification of informative characteristics and establishment of their correlations with surface properties.…”

Section: Perspective On Phenomenological Modelling and Research Of Elmentioning

confidence: 99%

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

Парфенов

Yerokhin

Nev’yantseva

et al. 2015

Surface and Coatings Technology

155

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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: Perspective On Phenomenological Modelling and Research Of Elmentioning

confidence: 99%

Section: Perspective On Phenomenological Modelling and Research Of Elmentioning

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

155

View full text Add to dashboard Cite

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“…As previously shown with magnesium alloys [12,13] or titanium [14,15], the sparking phenomenon is dependent on the electrochemical properties and composition of the oxide layer formed during the classical anodizing phase before the dielectric breakdown voltage.…”

Section: Introductionmentioning

confidence: 86%

Initial stages of multi-phased aluminium alloys anodizing by MAO: micro-arc conditions and electrochemical behaviour

Veys‐Renaux

Rocca

2015

J Solid State Electrochem

Self Cite

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International audienceThe electrochemical behaviour of AA1050 and AA2214 alloys was studied in a KOH/silicate in order to investigate the first stages of the coating formation during MAO process (by SEM and electrochemical measurements). Before the sparking initiation, occurring around 300 V for both alloys, a thin inner layer of aluminium oxide grows by a classical anodizing mechanism, and induces a great enhancement of the electrochemical resistance. Then, the micro-arc regime beyond 300 V leads to the formation of a dense, thicker but cracked external aluminium oxide layer. Afterwards, from 400 V, a sharp increase of current density named ``current wall'' and due to an increase of oxide conductivity, leads to a significant oxygen release and the occurrence of large and energetic sparks. Microscopic analyses reveal that the presence of copper-rich intermetallic phases in the multi-phased alloy (AA2214) induces the incorporation of copper nanoparticles in the gamma-alumina layer formed by the sparking phenomenon. These copper particles increase the reaction of water oxidation during the classical anodizing stage, and result in a delay of the sparking initiation during the galvanostatic anodizing and in a lower electrochemical resistance of the anodized layers

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“…All data were corrected by a linear shift so that the peak maximum of the C 1 s originated from adventitious carbon corresponded to 285.0 eV. [20] Results and discussion XPS analysis for the passivated pure nickel Figure 1 shows the XPS spectra of the passivated pure nickel. As can be seen in Fig.…”

Section: Xps Analysismentioning

confidence: 99%

The effect of nonmetallic element P in electroless Ni-P coating on the passivation process during chemical conversion treatment

2014

Surf. Interface Anal.

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Pure Ni and electroless Ni-P coating (ENPC) were passivated by a chemical conversion treatment. The passive films formed on pure Ni and ENPCs (with content of P 2.9, 7.2 and 11.7 at.% respectively) were analyzed by X-ray photoelectron spectroscopy (XPS). High-resolution XPS was also used to analyze the chemical states of the elements detected in the passive films. The results indicated that the detected Ni and P were in elemental states, and no compound with Ni and P element was detected in passive film, meaning that Ni and P did not participate in the formation of the passive film. The content of film-forming reaction product in passive film increases with the content of element P in Ni-P coating, suggesting that the nonmetallic P in Ni-P coating played an important role in the formation of the passive film. The XPS results were used to analyze the formation mechanism of the passive film.

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Micro-arc oxidation of AZ91 Mg alloy: An in-situ electrochemical study

Cited by 48 publications

References 21 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

Initial stages of multi-phased aluminium alloys anodizing by MAO: micro-arc conditions and electrochemical behaviour

The effect of nonmetallic element P in electroless Ni-P coating on the passivation process during chemical conversion treatment

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