Pulsed nanocrystalline plasma electrolytic carburising for corrosion protection of a γ-TiAl alloy

Aliofkhazraee, M.; Rouhaghdam, A. Sabour; Shahrabi, T.

doi:10.1016/j.jallcom.2007.06.007

Cited by 32 publications

(18 citation statements)

References 12 publications

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“…This evidently shows that the coatings provide an enhanced corrosion protection. Also, all of the samples have the same coating composition as mention in the first part of this article [16]. Moreover, the extended treatment and diluted glycerol solution, as demonstrated in Experiment 3, produces a sound …”

Section: Corrosion Resistance Of Coatingsmentioning

confidence: 80%

Pulsed nanocrystalline plasma electrolytic carburising for corrosion protection of a γ-TiAl alloy

Aliofkhazraee

Rouhaghdam

2008

Journal of Alloys and Compounds

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A number of studies have been reported on the use of plasma electrolytic carburising technology for surface hardening of different metals for higher corrosion and wear resistance resulted from this technique. However, very few have focused on the optimization of the pulsed nanocrystalline plasma electrolytic carburising process parameters. In this study, a design of experiment (DOE) technique, the Taguchi method, has been used to optimize the pulsed nanocrystalline plasma electrolytic carburising, not only for surface hardening but also for the corrosion protection of Ti-48Al-2Cr-2Nb (at%) titanium alloy by controlling the coating process's factors. The experimental design consisted of four factors (glycerol concentration, electrical conductivity of electrolyte, applied voltage and duration of process), each containing three levels. All experiments were done under constant frequency and duty cycle of rectangular shape pulse current method. Pure aluminum and titanium carbides were detected by XRD on the surface of the treated samples. Tafel polarization measurements were carried out to determine the corrosion resistance of the coated samples. The results were analyzed with related software. An analysis of the mean of signal-to-noise (S/N) ratio indicated that the corrosion resistance of pulsed plasma electrolytic carburized Ti-48Al-2Cr-2Nb (at%) alloy was influenced significantly by the levels in the Taguchi orthogonal array. The optimized coating parameters for corrosion resistance are 1200 g/l for glycerol concentration, 360 mS/cm for electrical conductivity of electrolyte, 400 V for applied voltage, 30 min for treatment time. The percentage of contribution for each factor was determined by the analysis of variance (ANOVA). The results showed that the applied voltage is the most significant factor affecting the corrosion resistance of the coatings.

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Section: Corrosion Resistance Of Coatingsmentioning

confidence: 80%

Pulsed nanocrystalline plasma electrolytic carburising for corrosion protection of a γ-TiAl alloy

Aliofkhazraee

Rouhaghdam

2008

Journal of Alloys and Compounds

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“…This, together with hydrogen evolution, contributes towards formation of VGE, whereas deposition of reduced cations changes electrode surface composition. The metal electrode in the cathode treatments can be heated up to 1000 °C, which enables plasma electrolytic carburising and nitrocarburising (PEC/N) and other diffusion-based treatments [45,46]. For the anode EPPs, the electrode area ratio is less critical.…”

Section: Working Electrode Polaritymentioning

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

159

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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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“…Also, further extending the frequency enables blue sparks to perform, which lead to dense layer formation and thus high corrosion and wear resistance. [15][16][17] The response of the S/N ratio to temperature of electrolyte is shown in Fig. 2.…”

Section: Size Of Nanocrystalline Carbonitrides Of Coatingsmentioning

confidence: 99%

“…It has also been revealed that by changing the size of nanocrystalline carbonitrides, other properties of coatings, such as their corrosion and wear resistances, will change significantly. 19,20 Conclusions The Taguchi method for the design of experiments has been used for optimizing pulsed plasma electrolytic carbonitriding process parameters for the production of compound and penetrative coatings for the lowest size of nanocrystalline carbonitrides of treated CP-Ti after surface hardening. The applied voltage during the coating process is found to be the major factor affecting the size of nanocrystalline carbonitrides of the coating.…”

Section: Confirmation Runmentioning

confidence: 99%

Study of bipolar pulsed nanocrystalline plasma electrolytic carbonitriding on nanostructure of compound layer for CP-Ti

et al. 2008

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Surface hardening of commercially pure titanium using bipolar pulsed nanocrystalline plasma electrolytic carbonitriding has been studied in this investigation. The coating process has been performed on triethanolamine-based electrolytes using a cooling bath. The nanostructure of obtained compound layers was examined with figure analysis of SEM nanographs. The effects of process variables (i.e., frequency, temperature of electrolytes, applied voltage, and treatment time) have been studied experimentally. Statistical methods were used to achieve the optimum size of nanocrystals. Finally, the contribution percentage of the effective factors of pulsed current was revealed, and confirmation showed the validity of obtained results. It has also been revealed that by changing the size of nanocrystalline carbonitrides, other properties of the coating will change significantly.

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Pulsed nanocrystalline plasma electrolytic carburising for corrosion protection of a γ-TiAl alloy

Cited by 32 publications

References 12 publications

Pulsed nanocrystalline plasma electrolytic carburising for corrosion protection of a γ-TiAl alloy

Pulsed nanocrystalline plasma electrolytic carburising for corrosion protection of a γ-TiAl alloy

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

Study of bipolar pulsed nanocrystalline plasma electrolytic carbonitriding on nanostructure of compound layer for CP-Ti

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