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http://dx.doi.org/10.4313/JKEM.2016.29.4.218

Effect of PEO Process Conditions on Oxidized Surface Properties of Mg alloy, AZ31 and AZ91. I. Applied Voltage and Time  

Ham, Jae-Ho (Department of Materials Sci. and Eng., Incheon Natational University)
Jeon, Min-Seok (Material & Components Technology Center, Korea Testing Laboratory)
Kim, Yong-Nam (Material & Components Technology Center, Korea Testing Laboratory)
Shin, Min Chul (Material & Components Technology Center, Korea Testing Laboratory)
Kim, Kwang Youp (MST Technology)
Kim, Bae-Yeon (Department of Materials Sci. and Eng., Incheon Natational University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.29, no.4, 2016 , pp. 218-224 More about this Journal
Abstract
The surface of Mg alloy, AZ31 and AZ91, were treated by PEO (plasma electrolytic oxidation) in Na-P system electrolyte, with different applied voltage and time. Thickness, roughness and X-ray crystallographic analysis revealed several results. The more applied time and voltage of PEO treated, the thicker oxidized surface coating layer were covered. And surface roughness increased with the thickness of oxidized layer. It was thought that when oxide layer grew, resistivity and breakdown voltage increased with the thickness of layer, and then, the energy of micro plasma need to be higher then before. So, it made craters and pores of surface become greater, which were responsible for the coarse surface.
Keywords
PEO; Oxidization; Mg alloy; Crystal structure; Electric properties;
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