Special Issue "Metals Functionalization via Plasma Electrolytic Oxidation"
Deadline for manuscript submissions: closed (31 December 2019).
Interests: anodic treatments of titanium, titanium alloys and more exotic metals; plasma electrolytic oxidation; electropolishing of valve metals; electrosynthesis of organic compounds; corrosion mitigation and bioactivity enhancement of dental and bone implants
Due to the specific applications of many metallic materials, studies on the use of surface modification techniques are in progress. To obtain functional coatings on different metals like Ti, Ti alloys, Mg, Al, Zr, Nb, Ta, many methods could be applied, such as electrophoretic deposition (EPD), anodic oxidation, plasma electrolytic oxidation (PEO) (which is also known as micro-arc oxidation (MAO)), chemical or physical vapor deposition (CVD, PVD), or ion implantation. Modification of the surface by anodic oxidation is relatively easy and inexpensive. It enables good adhesion to the substrate and allows for homogeneous oxide coatings to be obtained, which can be enriched with interesting compounds/elements during the process. There are two types of anodic oxidation processes. The first type involves oxidation at a voltage that is lower than the breakdown voltage of the oxide layer. Such oxidation leads to the homogenization of the natural oxide layer and alters its structure. The second type involves oxidation at a voltage higher than the breakdown voltage of the oxide layer and is called plasma electrolytic oxidation (PEO), anode spark electrolysis, or plasma electrolytic anode treatment. This technique results in the formation of numerous micropores on the anodized metal surface. The compounds from a solution can penetrate into the oxide layer during the course of the glow discharge effect on the sample substrate, which occurs during plasma electrolytic oxidation. PEO coatings offer improved surface performance, increased hardness, and better corrosion resistance. Self-passivating metals (Al, Mg, Ti, Zr, Ta) and their alloys undergo plasma electrolytic oxidation very easily. By applying such a processing method, these metals can be used in new applications. PEO process can be used to formation new types of biomaterials, catalysts, wear resistant materials, corrosion resistant materials.
Prof. Dr. Wojciech Simka
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- plasma electrolytic oxidation
- micro-arc oxidation
- surface modification
- corrosion resistance