Overview on plasma electrolytic oxidation of magnesium alloys for medical and engineering applications

Abstract

The scope of this review article is to offer a general view of the recent advances in the plasma electrolytic oxidation of Mg and Mg alloys with emphasis of the Plasma Electrolytic Oxidation (PEO) processing parameters used to obtain key surface properties for medical and engineering applications. The paper presents the different dependencies of the PEO process, first of all depending on the composition of the substrate, the electrolyte used, the applied electrical regime, as well as the way of their interaction, with direct implications on the properties designed to satisfy concrete applications for magnesium alloys. Magnesium-deformable alloys are of particular interest for the manufacture of parts for the for medical and engineering applications and industry due to the possibility of obtaining a more homogeneous structure and better mechanical properties, compared to cast parts. Also, magnesium alloys find its place to a broad range of aerospace, electronics, commercial and sport-related applications. In general, the interactions of the substrate / electrolyte combination with the electrical regime are complex and still the subject of ample research. Because, unlike other electrolytic surface treatment methods, PEO results in the formation of high-strength ohmic layers, they affect, especially in the case of current-controlled regimes, the extent to which the predefined electrical pulse is projected correctly in the setting experimental data.

Unveiling the Effect of Particle Incorporation in PEO Coatings on the Corrosion and Wear Performance of Magnesium Implants

“…Based on all of the studies related to this subject, it has been de- It has been observed that particle size plays a significant role in the uptake process. Nanoparticles penetrate deeper into coatings than microparticles, based on the results of other studies [97]. Large particles, on the other hand, cannot penetrate through pores on the surface of the layer.…”

MgAl Oxide Coatings Modified with CeO2 Particles Formed by Plasma Electrolytic Oxidation of AZ31 Magnesium Alloy: Photoluminescent and Photocatalytic Properties

“…Lately, PEO has become increasingly popular as a method for producing multifunctional coatings and improving the surface characteristics of magnesium and its alloys [10][11][12][13][14][15][16][17][18]. Some studies have shown that oxide coatings formed on magnesium alloys can be used in photocatalytic applications [19][20][21][22][23].…”