Abstract
The plasma electrolytic oxidation (PEO) process in AZ91 Mg alloy is studied using a solution containing KOH + KF + Na 2SiO 3 both with and without potassium permanganate (KMnO 4). The addition of potassium permanganate to the electrolyte influences coating thickness, surface morphology and the microstructure of oxide layers obtained by the PEO process. Oxide layers formed on AZ91 Mg alloy by the electrolyte containing KMnO 4 consists of MgO, MgF 2, Mg 2SiO 4 and Mn 2O 3. The corrosion resistance of the sample processed in bath containing KMnO 4 was superior to that of the sample processed in the bath without KMnO 4. It is suggested that enhancement of the corrosion resistance of AZ91 Mg alloy depends strongly on the presence of manganese oxide in the oxide layer.
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