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2022 Vol.32, Issue 6 Preview Page
Effect of AZ31 PEO Coating Layer Formation According to Alginic Acid Concentration in Electrolyte Solution
Min Soo Kim1
,
Jong Seop Kim2
,
Su Jeong Park2
,
Bon Heun Koo3†
1School of Advanced Defense Engineering, College of Interdisciplinary Cooperative Process, Changwon National University, Changwon 51140, Republic of Korea
2Department of Materials Convergence and System Engineering, Changwon National University, Changwon 51140, Republic of Korea
3School of Materials Science and Engineering, Changwon National University, Changwon 51140, Republic of Korea
†Corresponding author E-Mail : bhkoo@changwon.ac.kr (B. H. Koo, CWNU)
June 2022. pp. 301-306
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Abstract

This study explored the possibility of forming a coating layer containing alginic acid on the surface of a magnesium alloy to be used as a biomaterial. We formed a coating layer on the surface of a magnesium alloy using a plasma electrolytic oxidation process in an electrolytic solution with different amounts of alginic acid (0 g/L ~ 8 g/L). The surface morphology of all samples was observed, and craters and nodules typical of the PEO process were formed. The cross-sectional shape of the samples confirmed that the thickness of the coating layer became thicker as the alginic acid concentration increased. It was confirmed that the thickness and hardness of the sample significantly increase with increasing alginic acid concentration. The porosity of the surface and cross section tended to decrease as the alginic acid concentration increased. The XRD patterns of all samples revealed the formation of MgO, Mg2SiO4, and MgF2 complex phases. Polarization tests were conducted in a Stimulate Body Fluid solution similar to the body's plasma. We found that a high amount of alginic acid concentration in the electrolyte improved the degree of corrosion resistance of the coating layer.

Keywords
plasma electrolytic oxidation
x-ray diffraction
scanning electron microscope
hardness
porosity
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 32
  • No :6
  • Pages :301-306
  • Received Date : 2022-05-13
  • Revised Date : 2022-06-15
  • Accepted Date : 2022-06-16
  • DOI :https://doi.org/10.3740/MRSK.2022.32.6.301
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