Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Influence of OH- Ion Concentration on the Properties of Eelectrolytic Plasma Oxide Coatings Formed on AZ61A Alloy

전해 플라즈마 공정에 의해 AZ61A 합금에 형성된 산화물층의 특성에 미치는 OH- 이온 농도의 영향

  • Shin, Seong Hun (School of Materials Science and Engineering, Changwon National University) ;
  • Jeong, Young Seung (School of Materials Science and Engineering, Changwon National University) ;
  • Rehman, Zeeshan Ur (School of Materials Science and Engineering, Changwon National University) ;
  • Koo, Bon Heun (School of Materials Science and Engineering, Changwon National University)
  • 신성훈 (창원대학교 신소재공학부) ;
  • 정영승 (창원대학교 신소재공학부) ;
  • ;
  • 구본흔 (창원대학교 신소재공학부)
  • Received : 2016.06.28
  • Accepted : 2016.08.30
  • Published : 2016.10.27
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Abstract

The effect of NaOH concentration on the properties of electrolytic plasma processing (EPP) coating formed on AZ61A Mg alloy is studied. Various types of EPP were employed on magnesium alloy AZ61A in a silicate bath with different concentrations of NaOH additive. Analysis of the composition and structure of the coating layers was carried out using an X-ray diffractometer (XRD) and a scanning electron microscope (SEM). The results showed that the oxide coating layer mainly consisted of MgO and $Mg_2SiO_4$; its porosity and thickness were highly dependent on the NaOH concentration. The Vickers hardness was over 900 HV for all the coatings. The oxide layer with 3 g/l of NaOH concentration exhibited the highest hardness value (1220 HV) and the lowest wear rate. Potentiodynamic testing of the 3 g/l NaOH concentration showed that this concentration had the highest corrosion resistance value of $2.04{\times}10^5{\Omega}cm^2$; however, the corrosion current density value of $5.80{\times}10^{-7}A/cm^2$ was the lowest such value.

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References

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