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Appl. Sci. 2017, 7(9), 889; doi:10.3390/app7090889

An Investigation of Oxide Coating Synthesized on an Aluminum Alloy by Plasma Electrolytic Oxidation in Molten Salt

Zimin Advanced Materials Laboratory, Department of Chemical Engineering, Biotechnology and Materials, Ariel University, Ariel 40700, Israel
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Received: 9 August 2017 / Revised: 22 August 2017 / Accepted: 28 August 2017 / Published: 30 August 2017
(This article belongs to the Section Materials)
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Abstract

Plasma electrolytic oxidation (PEO) is a surface treatment process for obtaining oxide coatings with a high performance on valve metals. PEO is mostly performed in an aqueous solution electrolyte that limits the size of treated parts due to the fact that the system is heated. Therefore, the coating of large surfaces cannot be synthesized in an aqueous electrolyte. In the current work, an alternative approach of PEO treatment, whereby an aluminum 1050 alloy in nitrate molten salt at a temperature of 280 °C is applied, was investigated. The microstructure, phase and chemical compositions, and micro-hardness were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and micro-hardness tests. The obtained results show that formed coating contains from two sub-layers: one is the outer sub-layer of the α-Al2O3 phase and the second is its inner sub-layer. It was found that the formed coating was free of any contaminants originating from the electrolyte and had no cracks or pores, which are usually present in coatings formed by PEO treatment in an aqueous solution electrolyte. View Full-Text
Keywords: plasma electrolytic oxidation; aluminum coating; aluminum oxide; molten salt plasma electrolytic oxidation; aluminum coating; aluminum oxide; molten salt
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MDPI and ACS Style

Sobolev, A.; Kossenko, A.; Zinigrad, M.; Borodianskiy, K. An Investigation of Oxide Coating Synthesized on an Aluminum Alloy by Plasma Electrolytic Oxidation in Molten Salt. Appl. Sci. 2017, 7, 889.

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