Journal
ELECTROCHIMICA ACTA
Volume 54, Issue 23, Pages 5479-5485Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.04.047
Keywords
Magnesium alloy; Plasma electrolytic oxidation; Corrosion; Potassium permanganate; Anodizing
Categories
Funding
- Ministry of Knowledge Economy (MKE), Republic of Korea
- Korea Science and Engineering Foundation [2009-0079807]
- National Research Foundation of Korea [과C6A2605, 핵C6A1502, 2009-0079807] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The plasma electrolytic oxidation (PEO) process in AZ91 Mg alloy is studied using a solution containing KOH + KF + Na2SiO3 both with and without potassium permanganate (KMnO4). 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 KMnO4 consists of MgO, MgF2, Mg2SiO4 and Mn2O3. The corrosion resistance of the sample processed in bath containing KMnO4 was superior to that of the sample processed in the bath without KMnO4. 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. (C) 2009 Elsevier Ltd. All rights reserved.
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