Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Processing Time on the Microarc Oxidation Coatings Produced on Magnesium AZ61 Alloy at Constant Hybrid Voltage

  • Ur Rehman, Zeeshan (School of Materials Science and Engineering, Changwon National University) ;
  • Jeong, Yeong Seung (School of Materials Science and Engineering, Changwon National University) ;
  • Koo, Bon Heun (School of Materials Science and Engineering, Changwon National University)
  • Received : 2015.07.27
  • Accepted : 2015.08.13
  • Published : 2015.10.27
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Abstract

MAO ceramic coatings were prepared on AZ61 magnesium alloy for various processing times ranging from 5 to 60 min, in an electrolyte solution based on silicate-fluoride. The mechanical, electrochemical and, microstructural properties and the phase compositions of the coating layers were investigated. In this work, unlike previous studies, coatings with high amounts of the $Mag_2SiO_4$ phase were formed which contained small amounts of MgO and $MgF_2$ at a processing condition of 30 min. A microstructural analysis revealed that the porosity of the coatings was reduced considerably with an increase in the processing time, together with a change in the pore geometry from an irregular to a spherical shape. Potentiodynamic polarization and mechanical testing results showed that the coatings acquired after a processing time of 30 min were superior to all of the others.

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