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Study of Plasma Electrolytic Oxidation Coatings on Aluminum Composites

1
Department of Nanotechnology, Keldysh Research Center, 125438 Moscow, Russia
2
Moscow Aviation Institute (National Research University), 121552 Moscow, Russia
3
Skobel’tsyn Institute of Nuclear Physics, Moscow State University, 11999 Moscow, Russia
4
Institute of Physical Chemistry and Electrochemistry of RAS, 119991 Moscow, Russia
*
Author to whom correspondence should be addressed.
Metals 2018, 8(6), 459; https://doi.org/10.3390/met8060459
Received: 29 April 2018 / Revised: 12 June 2018 / Accepted: 13 June 2018 / Published: 15 June 2018
(This article belongs to the Special Issue Plasma Electrolytic Oxidation)
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Abstract

Coatings, with a thickness of up to 75 µm, were formed by plasma electrolytic oxidation (PEO) under the alternating current electrical mode in a silicate-alkaline electrolyte on aluminum composites without additives and alloyed with copper (1–4.5%). The coatings’ structure was analyzed by scanning electron microscopy, X-ray microanalysis, X-ray photoelectron spectroscopy, nuclear backscattering spectrometry, and XRD analysis. The coatings formed for 60 min were characterized by excessive aluminum content and the presence of low-temperature modifications of alumina γ-Al2O3 and η-Al2O3. The coatings formed for 180 min additionally contained high-temperature corundum α-Al2O3, and aluminum inclusions were absent. The electrochemical behavior of coated composites and uncoated ones in 3% NaCl was studied. Alloyage of aluminum composites with copper increased the corrosion current density. Plasma electrolytic oxidation reduced it several times. View Full-Text
Keywords: aluminum composites; plasma electrolytic oxidation; ceramic-like coatings; alumina; nuclear backscattering spectrometry; XRD analysis; electrochemical behavior aluminum composites; plasma electrolytic oxidation; ceramic-like coatings; alumina; nuclear backscattering spectrometry; XRD analysis; electrochemical behavior
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Agureev, L.; Savushkina, S.; Ashmarin, A.; Borisov, A.; Apelfeld, A.; Anikin, K.; Tkachenko, N.; Gerasimov, M.; Shcherbakov, A.; Ignatenko, V.; Bogdashkina, N. Study of Plasma Electrolytic Oxidation Coatings on Aluminum Composites. Metals 2018, 8, 459.

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