Electrochemical Corrosion Properties of AZ91 Mg Alloy via Plasma Electrolytic Oxidation and Subsequent Annealing

Title
Electrochemical Corrosion Properties of AZ91 Mg Alloy via Plasma Electrolytic Oxidation and Subsequent Annealing
Author(s)
고영건이강민[이강민]신동혁[신동혁]
Keywords
MICRO-ARC OXIDATION; MAGNESIUM ALLOY; COATINGS; BEHAVIOR; RESISTANCE
Issue Date
201107
Publisher
JAPAN INST METALS
Citation
MATERIALS TRANSACTIONS, v.52, no.8, pp.1697 - 1700
Abstract
The paper demonstrated the electrochemical corrosion properties of the oxide film of AZ91 Mg alloy subjected to plasma electrolytic oxidation (PEO) coating in an electrolyte containing zirconia and additional heat treatment. Surface observation revealed that a number of zirconia particles were successfully incorporated and were also uniformly distributed throughout the oxide film. After subsequent heat treatment, the relative fraction of Mg(OH)2 decreased whilst the fraction of MgO increased in the oxide film due to the dehydration reaction at 423 K. From the results of electrochemical impedance spectroscopy, the excellent corrosion resistance of AZ91 Mg alloy could be achieved via PEO coating together with annealing treatment. Electrochemical response underlying corrosion response of the present alloy was discussed in relation to equivalent circuit model. [doi:10.2320/matertrans.M2011112]
URI
http://hdl.handle.net/YU.REPOSITORY/24895http://dx.doi.org/10.2320/matertrans.M2011112
ISSN
1345-9678
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공과대학 > 신소재공학부 > Articles
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