A better understanding of PEO on Mg alloys by using a simple galvanostatic electrical regime in a KOH-KF-Na3PO4 electrolyte

► 10 min PEO on Mg alloys under galvanostatic conditions gives high protective layers. ► Fluoride anions act as “sparking initiators” in KOH electrolyte. ► Phosphate anions ensure the sealing of the coatings grown in KOH/KF based electrolyte.