Corrosion and tribocorrosion resistance of MAO-based composite coating on AZ31 magnesium alloy

Effects of voltage on microstructure and properties of micro-arc oxidation ceramic coatings on AZ31B magnesium alloy under constant current–constant voltage operation mode

“…Mg phase is the thin and porous coating; X-ray through the coating to the magnesium alloy substrate. It is well known that discharge channels are produced in the MAO process, and magnesium oxide is produced by the thermochemical reaction of the plasma in the discharge channels(Liu et al , 2022). The existence of Mg 2 SiO 4 and MgF 2 is due to the main anions (SiO 4 − and F − ) contained in the electrolyte and the reaction of some molten magnesium gushing out of the “Channel” during the reaction.…”

Effect of (NH4)2ZrF6, Voltage and Treating Time on Corrosion Resistance of Micro-Arc Oxidation Coatings Applied on ZK61M Magnesium Alloys

“…This can also be proved in Lee’s research [ 32 ], which clarified that the incorporation of ZrO 2 can improved corrosion property of MAO coatings effectively. It should be noted that there exist lots of MgF 2 concentrated in the micropores, according to Liu’s research [ 33 ], the deterioration rate of the MAO coating compounds can be reduced by the presence of MgF 2 when MAO coating was exposed to corrosive medium, so the existence of MgF 2 is of great help in preventing corrosive ions from reaching substrate surface quickly [ 34 ]. In addition, this is also the result of compacter structures and thicker coatings working together.…”

Progress in bioactive surface coatings on biodegradable Mg alloys: A critical review towards clinical translation

“…MAO, also known as plasma electrolytic oxidation (PEO) or anodic spark deposition (ASD), is an electrochemical technique to grow oxide layers on metallic substrates. MAO produces stable coatings with higher bonding strength and wear resistance, when compared to other anodization techniques like electrophoretic or electrochemical deposition [ 136 ]. The set-up consists of an anode (i.e., the substrate), an electrolytic media, and a cathode, usually stainless steel.…”