Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Anodic oxidation behavior of AZ31 Mg alloy in aqueous solution containing various NaF concentrations

  • Moon, Sungmo (Nano Surface Materials Division, Korea Institute of Materials Science) ;
  • Kwon, Duyoung (Nano Surface Materials Division, Korea Institute of Materials Science)
  • Received : 2022.08.23
  • Accepted : 2022.08.26
  • Published : 2022.08.31
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Abstract

This paper deals with anodic oxidation behavior of AZ31 Mg alloy in aqueous solutions containing various NaF concentrations from 0.01 M to 1 M. Three different voltage-time curves and anodic oxide formation behaviors appeared with concentration of NaF in deionized water. When NaF concentration is lower than 0.02 M, the voltage of AZ31 Mg alloy increased linearly and then reached a steady-state value more than 200 V, and large size pits and thin oxide layer were formed. When NaF concentration is between 0.05 M and 0.1 M, the voltage of AZ31 Mg alloy showed large periodic fluctuations of about 30 ~ 50 V around more than 200 V and large number of small particles were observed. If NaF concentration is higher than 0.2 M, PEO films can be formed without visible arcs under solution pH 6.5 ~ 7.5 by F- ions without help of OH- ions.

Keywords

Acknowledgement

This research was financially supported by Korea Institute of Materials Science (PNK8560).

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