PEO coatings obtained on an Mg–Mn type alloy under unipolar and bipolar modes in silicate-containing electrolytes

Gnedenkov, Sergey V.; Khrisanfova, O. A.; Zavidnaya, A. G.; Sinebryukhov, Sergey L.; Egorkin, Vladimir S.; Nistratova, M.V.; Yerokhin, Aleksey; Matthews, A.

doi:10.1016/j.surfcoat.2009.12.024

Cited by 153 publications

(77 citation statements)

References 28 publications

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“…[6][7][8][9]. Plasma Electrolyte Oxidation (PEO) is considered as one of the most cost-effective and environmentally friendly ways to improve the corrosion and wear resistance of magnesium and magnesium alloys [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…The PEO method can be used to form a thick, hard and adherent ceramic coating on the surface of Mg alloys as well as the valve metals (Al and Ti) and their alloys [14]. Coating surface morphology, structure and corrosion resistance are affected by many parameters including electrolyte composition [15][16][17][18], substrate material [19], and the electrical parameters, mainly current mode and current density [9,20]. Different current modes have been utilized in the PEO treatment including, DC, AC, unipolar and bipolar current modes [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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The effect of current mode and discharge type on the corrosion resistance of plasma electrolytic oxidation (PEO) coated magnesium alloy AJ62

Hussein

Zhang

Nie

et al. 2011

Surface and Coatings Technology

211

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Magnesium alloys are increasingly being used as lightweight materials in the automotive, defense, electronics, biomaterial and aerospace industries. However, their inherently poor corrosion and wear resistance have, so far, limited their application. Plasma electrolytic oxidation (PEO) in an environmentally friendly aluminates electrolyte has been used to produce oxide coatings with thicknesses of~80 μm on an AJ62 magnesium alloy. Optical emission spectroscopy (OES) in the visible and near ultraviolet (NUV) band (285 nm-800 nm) was employed to characterize the PEO plasma. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the coated materials, and potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in a 3.5% NaCl solution were used to determine the corrosion behavior. It was found that the plasma discharge behavior significantly influenced the microstructure and the morphology of the oxide coatings and, hence the corrosion resistance. The corrosion resistance of the coated alloy was increased by changing the current mode from unipolar to bipolar, where the strong plasma discharges had been reduced or eliminated.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of current mode and discharge type on the corrosion resistance of plasma electrolytic oxidation (PEO) coated magnesium alloy AJ62

Hussein

Zhang

Nie

et al. 2011

Surface and Coatings Technology

211

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“…For example, numerous investigations have been carried out on the influence of process parameters on MAO coating deposition; [6][7][8][9][10][11][12][13][14] the growth, formation, and structure of MAO coatings; [15][16][17][18][19][20][21][22][23][24][25] and also on the physical, mechanical, and tribological properties of MAO coatings. [26][27][28][29][30][31] The electrolyte chemistry not only influences the nature of the pore (open or closed) and its size distribution in the coating, but also the phases present in the coating, and both these factors have a bearing on the corrosion performance of the MAO coating.…”

Section: Introductionmentioning

confidence: 99%

Influence of Electrolyte Chemistry on Morphology and Corrosion Resistance of Micro Arc Oxidation Coatings Deposited on Magnesium

Krishna

Poshal

Sundararajan

2010

Metall Mater Trans A

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In the present work, micro arc oxidation (MAO) coatings were synthesized on magnesium substrate employing 11 different electrolyte compositions containing systematically varied concentrations of sodium silicate (Na 2 SiO 3 ), potassium hydroxide (KOH), and sodium aluminate (NaAlO 2 ). The resultant coatings were subjected to coating thickness measurement, energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM), image analysis, and three-dimensional (3-D) optical profilometry. The corrosion performance of the coatings was evaluated by conducting potentiodynamic polarization tests in 3.5 wt pct NaCl solution. The inter-relationships between the electrolyte chemistry and the resulting chemistry and porosity of the coating, on one hand, and with the aqueous corrosion behavior of the coating, on the other, were studied. The changes in pore morphology and pore distribution in the coatings were found to be significantly influenced by the electrolyte composition. The coatings can have either through-thickness pores or pores in the near surface region alone depending on the electrolyte composition. The deleterious role of KOH especially when its concentration is >20 pct of total electrolyte constituents promoting the formation of large and deep pores in the coating was demonstrated. A reasonable correlation indicating the increasing pore volume implying the increased corrosion was noticed.

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“…These non-linearities may explain why EPPs could in practice surpass their conventional counterparts but represent major challenges for their theoretical description. As will be discussed below, although a range of partial EPP models has been developed, none of them covers all varieties of processing conditions ranging from plasma electrolytic oxidation (PEO) [5] to coating stripping (EPCS) [6] and from heat treatment (EPHT) [7] to surface cleaning (EPSC) and polishing (EPPo) [8].…”

mentioning

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

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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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PEO coatings obtained on an Mg–Mn type alloy under unipolar and bipolar modes in silicate-containing electrolytes

Cited by 153 publications

References 28 publications

The effect of current mode and discharge type on the corrosion resistance of plasma electrolytic oxidation (PEO) coated magnesium alloy AJ62

The effect of current mode and discharge type on the corrosion resistance of plasma electrolytic oxidation (PEO) coated magnesium alloy AJ62

Influence of Electrolyte Chemistry on Morphology and Corrosion Resistance of Micro Arc Oxidation Coatings Deposited on Magnesium

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

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