Effect of Pulse Frequency on Corrosion Behavior of AZ91 Mg Alloy Treated by Microarc Discharge Oxidation Coating

Title
Effect of Pulse Frequency on Corrosion Behavior of AZ91 Mg Alloy Treated by Microarc Discharge Oxidation Coating
Author(s)
황인준[황인준]고영건이강민[이강민]신동혁[신동혁]
Keywords
PLASMA ELECTROLYTIC OXIDATION; AM50 MAGNESIUM ALLOY; CERAMIC COATINGS; MICROSTRUCTURE; RESISTANCE; SILICATE; ALUMINUM
Issue Date
201103
Publisher
JAPAN INST METALS
Citation
MATERIALS TRANSACTIONS, v.52, no.3, pp.580 - 583
Abstract
The paper demonstrated the anti-corrosion properties of an AZ91 Mg alloy fabricated via microarc discharge oxidation under an AC condition with various pulse frequencies ranging from 60 Hz to 2000 Hz. The structural features and phase compositions of the coating layers were characterized by utilizing scanning electron microscope and X-ray photoelectron spectroscopy. The optimum frequency for the coating layers with thick, uniform thicknesses was found to be 500 Hz for the conditions used in this study. This fact was explained by the change in the mode of spark discharge during coating, resulting in the occurrence of surface cracks as well as the transformation of Mg(OH)(2) to MgO. Potentio dynamic polarization tests in 3.5 mass% NaCl solution revealed that the sample coated at a frequency of 500 Hz exhibited a corrosion potential of -1.42 V (vs. Ag/AgCl), suggesting a better corrosion resistance as compared to the other conditions. [doi:10.2320/matertrans.M2010395]
URI
http://hdl.handle.net/YU.REPOSITORY/25512http://dx.doi.org/10.2320/matertrans.M2010395
ISSN
1345-9678
Appears in Collections:
공과대학 > 신소재공학부 > Articles
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