Special Issue "Plasma Electrolytic Oxidation"

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 30 April 2018

Special Issue Editor

Guest Editor
Prof. Dr. Tadeusz Hryniewicz

Koszalin Univ Technol, Dept Engn & Informat Syst, Div Bioengn & Surface Electrochem, Raclawicka 15-17, PL-75620 Koszalin, Poland
Website | E-Mail
Interests: Plasma Electrolytic Oxidation (PEO); Micro Arc Oxidation (MOA); aluminum; magnesium; titanium; tantalum; niobium; alloys

Special Issue Information

Dear Colleagues,

Plasma Electrolytic Oxidation (PEO), also known as Micro Arc Oxidation, is used to obtain porous coatings on metals such as aluminum, magnesium, titanium, tantalum, niobium, and their alloys. The first works on electrolyte discharge phenomena are dated as early as 1880, and the practical use of oxidation of aluminum by PEO started in 1970. These two dates should be recognized as the beginning of the Plasma Electrolytic Oxidation age. Afterwards, that technology was patented and introduced to industrial applications in the 1980s. Most important is that PEO coatings formed on metals and alloys may be enriched using selected elements, originating from the electrolytes used. The chemical and phase compositions, as well as porosity and the thickness of the PEO coating depend on the values of the DC and AC voltages used for that treatment. The expected applications of PEO coatings can be found in aerospace and space industries, as well as in the production of biomaterials and automotive catalytic converters. Investigations into PEO processing and the physical–chemical and mechanical properties of these porous coatings are the objective of this Special Issue.

A Special Issue, titled “Plasma Electrolytic Oxidation”, is expected to be prepared and edited in 2018. As a Guest Editor of this Special Issue, I invite you to submit a paper, which will be peer reviewed to be accepted for publication in Metals. The manuscripts are expected by the end of 2017, with a deadline in the beginning of 2018.

Best regards,

Prof. Dr. Tadeusz Hryniewicz
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Plasma Electrolytic Oxidation (PEO)
  • Micro arc Oxidation (MOA)
  • Aluminum
  • Magnesium
  • Titanium
  • Tantalum
  • Niobium
  • Alloys

Published Papers (2 papers)

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Research

Open AccessArticle Characterisation of Calcium- and Phosphorus-Enriched Porous Coatings on CP Titanium Grade 2 Fabricated by Plasma Electrolytic Oxidation
Metals 2017, 7(9), 354; doi:10.3390/met7090354
Received: 1 August 2017 / Revised: 16 August 2017 / Accepted: 1 September 2017 / Published: 8 September 2017
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Abstract
In the paper, Scanning Electron Microscopy (SEM), Energy-dispersive X-ray Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS), and Glow Discharge Optical Emission Spectroscopy (GDOES) analyses of calcium- and phosphorus-enriched coatings obtained on commercial purity (CP) Titanium Grade 2 by plasma electrolytic oxidation (PEO), known also
[...] Read more.
In the paper, Scanning Electron Microscopy (SEM), Energy-dispersive X-ray Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS), and Glow Discharge Optical Emission Spectroscopy (GDOES) analyses of calcium- and phosphorus-enriched coatings obtained on commercial purity (CP) Titanium Grade 2 by plasma electrolytic oxidation (PEO), known also as micro arc oxidation (MAO), in electrolytes based on concentrated phosphoric acid with calcium nitrate tetrahydrate, are presented. The preliminary studies were performed in electrolytes containing 10, 300, and 600 g/L of calcium nitrate tetrahydrate, whereas for the main research the solution contained 500 g/L of the same hydrated salt. It was found that non-porous coatings, with very small amounts of calcium and phosphorus in them, were formed in the solution with 10 g/L Ca(NO3)2·4H2O, whereas the other coatings, fabricated in the consecutive electrolytes containing from 300 up to 650 g/L Ca(NO3)2·4H2O, were porous. Based on the GDOES data, it was also found that the obtained porous PEO coating may be divided into three sub-layers: the first, top, porous layer was the thinnest; the second, semi-porous layer was about 12 times thicker than the first; and the third, transition sub-layer was about 10 times thicker than the first. Based on the recorded XPS spectra, it was possible to state that the top 10-nm layer of porous PEO coatings included chemical compounds containing titanium (Ti4+), calcium (Ca2+), as well as phosphorus and oxygen (PO43− and/or HPO42− and/or H2PO4, and/or P2O74−). Full article
(This article belongs to the Special Issue Plasma Electrolytic Oxidation)
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Open AccessFeature PaperArticle Influence of Alkali Treatment on Anodized Titanium Alloys in Wollastonite Suspension
Metals 2017, 7(9), 322; doi:10.3390/met7090322
Received: 12 July 2017 / Revised: 3 August 2017 / Accepted: 17 August 2017 / Published: 23 August 2017
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Abstract
The surface modification of titanium alloys is an effective method to improve their biocompatibility and tailor the material to the desired profile of implant functionality. In this work, technologically-advanced titanium alloys—Ti-15Mo, Ti-13Nb-13Zr and Ti-6Al-7Nb—were anodized in suspensions, followed by treatment in alkali solutions,
[...] Read more.
The surface modification of titanium alloys is an effective method to improve their biocompatibility and tailor the material to the desired profile of implant functionality. In this work, technologically-advanced titanium alloys—Ti-15Mo, Ti-13Nb-13Zr and Ti-6Al-7Nb—were anodized in suspensions, followed by treatment in alkali solutions, with wollastonite deposition from the powder phase suspended in solution. The anodized samples were immersed in NaOH or KOH solution with various concentrations with a different set of temperatures and exposure times. Based on their morphologies (observed by scanning electron microscope), the selected samples were investigated by Raman and X-ray photoelectron spectroscopy (XPS). Titaniate compounds were formed on the previously anodized titanium surfaces. The surface wettability significantly decreased, mainly on the modified Ti-15Mo alloy surface. Titanium alloy compounds had an influence on the results of the titanium alloys’ surface modification, which caused the surfaces to exhibit differential physical properties. In this paper, we present the influence of the anodization procedure on alkali treatment effects and the properties of obtained hybrid coatings. Full article
(This article belongs to the Special Issue Plasma Electrolytic Oxidation)
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