Journal of Surface Science and Engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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PEO Film Formation Behavior of AZ31 Mg Alloy under Pulse Current

펄스 전류 하에서 AZ31 마그네슘 합금의 플라즈마전해산화 피막의 형성 거동

  • Moon, Sungmo (Surface Technology Division, Korea Institute of Materials Science)
  • 문성모 (한국재료연구원 나노표면재료연구본부)
  • Received : 2022.10.24
  • Accepted : 2022.10.27
  • Published : 2022.10.31
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Abstract

In this study, PEO (plasma electrolytic oxidation) film formation behavior of AZ31 Mg alloy under application of 300 Hz pulse current was studied by the analyses of V-t curve, arc generation behavior, PEO film thickness and morphology of PEO films with treatment time in 0.05 M NaOH + 0.05 M Na2SiO3 + 0.1 M NaF solution. PEO films was observed to grow after 10 s of application of pulse current together with generation of micro-arcs. PEO film grew linearly with treatment time at a growth rate of about 5.58 ㎛/min at 200 mA/cm2 of pulse current but increasing rate of film formation voltage became lowered largely with increasing treatment time after passing about 250 V, suggesting that resistivity of PEO films during micro-arc generation decreases with increasing film formation voltage at more than 250 V.

Keywords

Acknowledgement

This research was financially supported by a research grant of KIMS.

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