Corrosion resistance of plasma electrolytic oxidation layer of a non-ignitable Mg-Al-Mn-Ca magnesium alloy

A non-ignitable Mg-Al-Mn-Ca magnesium alloy denoted as AMX602 was treated by plasma electrolytic oxidation (PEO) in phosphate - silicate mixture electrolyte, and the morphology, compositions and corrosion resistance of PEO layer on AMX602 alloy were investigated and compared to those of PEO layer on AZ31B alloy. The influence of intermetallic compounds on corrosion resistance of PEO layer on AMX602 alloy was discussed. The results suggest that the chemical composition and structure of PEO layer are influenced by the intermetallic particles in AMX602 alloy, and the corrosion resistance of PEO layer on AMX602 alloy is inferior to that on AZ31B alloy.