Characterization of plasma electrolytic oxidation coatings formed on Mg-Li alloy in an alkaline polyphosphate electrolyte

► Blue and white ceramic coatings on Mg-Li alloy have been fabricated by PEO. ► The blue ceramic coating was composed of TiO2, Ti2O3 and periclase MgO. ► The blue ceramic coating exhibits better anticorrosive and tribological performance.