Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 496, Issue 1-2, Pages 548-552Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.02.098
Keywords
Oxide coating; AZ91D magnesium alloy; Micro-arc oxidation; Alumina sol; Corrosion resistance
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Oxide coatings were formed on AZ91D magnesium alloy using micro-arc oxidation process in alkaline electrolyte without and with addition of alumina sol. The microstructures and compositions of the MAO coatings were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). Corrosion behaviors of the coatings were evaluated with electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests in 3.5%NaCl solution. Porosities of the coatings were measured by potentiodynamic polarization tests. It was found that the coating produced in the electrolyte with alumina sol has more compact and uniform morphology than that produced in the electrolyte without alumina sol. The results of corrosion tests showed that the coating formed in electrolyte with alumina sol enhances the corrosion resistance of the substrate significantly. XRD patterns showed that the coating produced in the electrolyte with alumina sol has more MgAl2O4 phase than MgO. (C) 2010 Elsevier B.V. All rights reserved.
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