Effect of Potassium Permanganate on Corrosion Behavior of Magnesium Alloy Prepared by Micro-Arc Oxidation

Title
Effect of Potassium Permanganate on Corrosion Behavior of Magnesium Alloy Prepared by Micro-Arc Oxidation
Author(s)
고영건이강민[이강민]신기룡[신기룡]신동혁[신동혁]
Keywords
PLASMA ELECTROLYTIC OXIDATION; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; CERAMIC COATINGS; MG ALLOY; AZ91D; FILMS; MICROSTRUCTURE; PERFORMANCE; PROTECTION; RESISTANCE
Issue Date
201008
Publisher
KOREAN INST METALS MATERIALS
Citation
KOREAN JOURNAL OF METALS AND MATERIALS, v.48, no.8, pp.724 - 729
Abstract
The effect of potassium permanganate (KMnO(4)) in an electrolyte on the corrosion performance of magnesium alloy coated by micro-arc oxidation (MAO) has been investigated in this study. For this purpose, MAO coating was carried out on the present sample under AC condition in an alkaline silicate electrolyte with and without KMnO(4). Irrespective of the addition of KMnO(4), it was found from structural observation that the ceramic coating layers consisted of inner and outer layers. In the sample processed in the electrolyte with KMnO(4), the outer layer became dense and even contained a number of Mn(2)O(3) atoms, resulting in high corrosion resistance. Based on the results of a potentiodynamic polarization test, it was confirmed that the coating layer formed in the electrolyte with KMnO(4)exhibited better corrosion resistance than that without KMnO(4). The high corrosion resistance of the MAO-treated magnesium alloy was explained in relation to the equivalent circuit model.
URI
http://hdl.handle.net/YU.REPOSITORY/23865http://dx.doi.org/10.3365/KJMM.2010.48.08.724
ISSN
1738-8228
Appears in Collections:
공과대학 > 신소재공학부 > Articles
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