Electronic Materials Letters

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effect of $Na_2SiO_3$ Concentration on the Properties of AZ31 Magnesium Alloy Prepared by Electrolytic Plasma Processing

  • Ahn, Byung-Hyun (School of Nano & Advance Material Engineering, Changwon National University) ;
  • Lee, Dong-Gun (School of Nano & Advance Material Engineering, Changwon National University) ;
  • Cho, Ho-Je (School of Nano & Advance Material Engineering, Changwon National University) ;
  • Lee, Seung-Rok (School of Nano & Advance Material Engineering, Changwon National University) ;
  • Ahmed, Faheem (School of Nano & Advance Material Engineering, Changwon National University) ;
  • Anwar, M.S. (School of Nano & Advance Material Engineering, Changwon National University) ;
  • Koo, Bon-Heun (School of Nano & Advance Material Engineering, Changwon National University)
  • Published : 2013.11.20
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Abstract

The effect of $Na_2SiO_3$ concentration on the dense ceramic oxide coatings prepared on a AZ31 magnesium alloy through electrolytic plasma processing in a NaOH-$Na_2SiF_6$ electrolytic solution, have been investigated. The x-ray diffraction (XRD) results showed that the coating formed in silicate electrolyte was mainly composed of MgO, $Na_2SiO_4$. Scanning electron microscopy (SEM) micrographs reveals that the number of pores on coatings decreases by increasing concentration of $Na_2SiO_3$ and coatings prepared in 12 - 20 g/L of $Na_2SiO_3$ show similar surface morphologies. The observed micro-hardness of coating layers is over 1000 Hv, which is much larger than that of the original AZ31 magnesium alloy without electrolytic plasma processing.

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