Influence of Current Density on Corrosion Properties of AZ91 Mg Alloy Coated by Plasma Electrolytic Oxidation Method

Title
Influence of Current Density on Corrosion Properties of AZ91 Mg Alloy Coated by Plasma Electrolytic Oxidation Method
Author(s)
이병욱[이병욱]황인준[황인준]이재식[이재식]고영건신동혁[신동혁]
Keywords
MAGNESIUM ALLOY; OXIDE COATINGS; BEHAVIOR; PROTECTION; RESISTANCE; GROWTH; MICROSTRUCTURE; PERFORMANCE; SILICATE
Issue Date
201108
Publisher
KOREAN INST METALS MATERIALS
Citation
KOREAN JOURNAL OF METALS AND MATERIALS, v.49, no.8, pp.601 - 607
Abstract
The study investigated the influence of current density on the corrosion-protection properties of an AZ91 Mg alloy subjected to plasma electrolytic oxidation coating. The present coatings were carried out under an AC condition at three different current densities, i.e., 100, 150, and 200 mA/cm(2). From microstructural observations, the micro cracks connecting each micro pore were pronounced on the oxide surface of the samples coated at current densities higher than 150 mA/cm(2) since increasing the current density in this study led to an increment in the relative volume fraction of the MgO compound. Based on potentio dynamic polarization and immersion tests, the sample coated at a current density of 100 mA/cm(2) showed superior corrosion resistance.
URI
http://hdl.handle.net/YU.REPOSITORY/24749http://dx.doi.org/10.3365/KJMM.2011.49.8.601
ISSN
1738-8228
Appears in Collections:
공과대학 > 신소재공학부 > Articles
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