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Introduction to Plasma Electrolytic Oxidation—An Overview of the Process and Applications
Open AccessArticle

Fabrication and Characterization of Ceramic Coating on Al7075 Alloy by Plasma Electrolytic Oxidation in Molten Salt

Department of Chemical Engineering, Ariel University, Ariel 40700, Israel
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Coatings 2020, 10(10), 993; https://doi.org/10.3390/coatings10100993
Received: 6 September 2020 / Revised: 8 October 2020 / Accepted: 14 October 2020 / Published: 17 October 2020
(This article belongs to the Special Issue Plasma Electrolytic Oxidation (PEO) Coatings)
The fabrication of a ceramic coating on the metallic substrate is usually applied to achieve the improved performance of the material. Plasma electrolytic oxidation (PEO) is one of the most promising methods to reach this performance, mostly wear and corrosion resistance. Traditional PEO is carried out in an aqueous electrolyte. However, the current work showed the fabrication and characterization of a ceramic coating using PEO in molten salt which was used to avoid disadvantages in system heating-up and the formation of undesired elements in the coating. Aluminum 7075 alloy was subjected to the surface treatment using PEO in molten nitrate salt. Various current frequencies were applied in the process. Coating investigations revealed its surface porous structure and the presence of two oxide layers, α-Al2O3 and γ-Al2O3. Microhardness measurements and chemical and phase examinations confirmed these results. Potentiodynamic polarization tests and electrochemical impedance spectroscopy revealed the greater corrosion resistance for the coated alloy. Moreover, the corrosion resistance was increased with the current frequency of the PEO process. View Full-Text
Keywords: plasma electrolytic oxidation (PEO); Al7075 alloy; aluminum oxide; molten salt; microhardness; corrosion resistance plasma electrolytic oxidation (PEO); Al7075 alloy; aluminum oxide; molten salt; microhardness; corrosion resistance
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Sobolev, A.; Peretz, T.; Borodianskiy, K. Fabrication and Characterization of Ceramic Coating on Al7075 Alloy by Plasma Electrolytic Oxidation in Molten Salt. Coatings 2020, 10, 993.

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