Improving the wear properties of AZ31 magnesium alloy under vacuum low-temperature condition by plasma electrolytic oxidation coating

Self-healing plasma electrolytic oxidation coatings doped with benzotriazole loaded halloysite nanotubes on AM50 magnesium alloy

“…Among these studies, plasma electrolytic oxidation (PEO) coatings have attracted significant attention, because this environmental friendly surface treatment can provide relatively good protection for lightweight metals, such as aluminium, magnesium and titanium [17,18,[20][21][22][23][24]. Recently, extensive studies have been carried out aimed at obtaining high-quality wear-and corrosion-resistant PEO coatings on components manufactured at a large scale [25,26]. Duplex and hybrid treatments have received significant attention to produce composite PEO coatings [6,27] that can provide synergistic effects leading to significant improvements in corrosion and wear resistance as well as the provision of additional functionalities to the surface.…”

Corrosion resistance and tribological behavior of ZK30 magnesium alloy coated by plasma electrolytic oxidation

“…The smaller pores are considered to be formed by ionic migration, while the larger ones result from the breakdown of the oxide layer [34]. As H. Li et al [14] explained, the formation of micropores and cracking during the PEO process are due to the existence of micro-discharge channels, in which plasma generates fused oxides and regions with air bubbles due to high temperatures. The fused oxides are solidified and form a microstructure with micropores.…”

“…Among them, Plasma Electrolytic Oxidation (PEO), particularly suitable for light metals (Al, Mg and Ti) as valve metals, has been of special interest [13]. During the PEO process, a ceramic film grows on the surface of the metal through the oxidation of the substrate and also through the reduction and incorporation of chemical elements present in the electrolyte [14]. Being similar to anodizing, PEO is an electrolytic process, but being different from anodizing, a non-toxic, slightly alkaline electrolyte is typically used and a high potential is applied.…”

A Review on Adhesion Strength of Peo Coatings by Scratch Test Method

“…[6][7][8] To surmount these shortcomings and improve the performance of the surface of these alloys, various coating methods (e.g., ion implantation, laser surfacing, di®usion treatment, thermal spraying, physical vapor deposition (PVD), chemical vapor deposition (CVD) and conversion coatings such as anodizing) are implemented. [9][10][11] Plasma electrolytic oxidation (PEO), also known as micro-arc oxidation (MAO) or micro-plasma oxidation (MPO), is a high-voltage anodizing process used for magnesium, [12][13][14][15][16] aluminum, [17][18][19][20][21] and titanium [22][23][24][25][26] alloys. The mechanism of PEO ceramic coating formation is controlled by complex chemical, electrochemical and plasma reactions.…”