This work looked into the influence of the sealing treatment on the structural feature and electrochemical response of AZ31 Mg alloy coated via plasma electrolytic oxidation (PEO). Here, the inorganic layers produced by PEO in an alkaline-phosphate electrolyte were subsequently immersed for different periods in cold (60 °C) and hot (100 °C) aqueous solutions containing either 1 or 3 gr of cobalt nitrate hexahydrate in the presence of hydrogen peroxide as an initiator.
