Journal
MATERIALS LETTERS
Volume 65, Issue 3, Pages 413-415Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2010.09.041
Keywords
Magnesium alloy; Zirconia sol; Oxidation; Surfaces; Corrosion
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The microarc oxidation coatings were prepared on AZ91D magnesium alloy in a Na2SiO3-KOH electrolyte with and without zirconia sol, respectively. The effect of zirconia sol as an additive in the electrolyte on the surface morphologies, compositions, structures, and corrosion resistances of the coatings were investigated. It was found that the coating formed in the Na2SiO3-KOH electrolyte with zirconia sol has more uniform morphology, less micropores and cracks than that formed in an electrolyte without zirconia sol. The phase compositions of the coatings also varied after addition of zirconia sol in the electrolyte, owing to the participation of zirconia sol in the reaction and its incorporation into the oxide coating, and Zr existed in the form of Mg2Zr5O12. The results of potentiodynamic polarization analysis show that the coating formed in the electrolyte with zirconia sol increases significantly corrosion resistance for magnesium alloy. (C) 2010 Elsevier B.V. All rights reserved.
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