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Plasma Electrolytic Oxidation of Titanium in H2SO4–H3PO4 Mixtures

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

1
Materials and Surface Engineering Group, Institute of Materials Science and Engineering, Chemnitz University of Technology, 09107 Chemnitz, Germany
2
Department of Corrosion Protection and Testing, EXCOR Korrosionsforschung GmbH, Magdeburger Strae 58, 01067 Dresden, Germany
3
Meotec GmbH, Triwo Technopark Aachen, Philipsstraße 8, 52001 Aachen, Germany
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(7), 628; https://doi.org/10.3390/coatings10070628
Received: 28 April 2020 / Revised: 24 June 2020 / Accepted: 28 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Plasma Electrolytic Oxidation (PEO) Coatings)
Plasma electrolytic oxidation (PEO), also called micro-arc oxidation (MAO), is an innovative method in producing oxide-ceramic coatings on metals, such as aluminum, titanium, magnesium, zirconium, etc. The process is characterized by discharges, which develop in a strong electric field, in a system consisting of the substrate, the oxide layer, a gas envelope, and the electrolyte. The electric breakdown in this system establishes a plasma state, in which, under anodic polarization, the substrate material is locally converted to a compound consisting of the substrate material itself (including alloying elements) and oxygen in addition to the electrolyte components. The review presents the process kinetics according to the existing models of the discharge phenomena, as well as the influence of the process parameters on the process, and thus, on the resulting coating properties, e.g., morphology and composition.
Keywords: plasma electrolytic oxidation; surface treatment; corrosion; wear; medical engineering; aluminum; magnesium; titanium plasma electrolytic oxidation; surface treatment; corrosion; wear; medical engineering; aluminum; magnesium; titanium
MDPI and ACS Style

Simchen, F.; Sieber, M.; Kopp, A.; Lampke, T. Introduction to Plasma Electrolytic Oxidation—An Overview of the Process and Applications. Coatings 2020, 10, 628.

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