MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Materials Chemistry
Corrosion Properties of the β-Mg17Al12 Phase in NaCl Solutions
Kaede SarayamaKenichi NakanoYusuke ShimadaAmi MorihiroMasahiko HatakeyamaSatoshi SunadaKoichi Sato
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2022 Volume 63 Issue 6 Pages 911-917

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Abstract

Polarization tests of the β-phase (Mg17Al12) in Mg–Al alloys were conducted using a 0.1 M NaCl solution (pH 11); Ecorr of the β-phase was −1.377 V. When Ag or Zn was added to the β-phase, Ecorr increased depending on the standard potential of the additive elements. However, the additive elements showed no significant difference in passive behavior during the test. This suggested that the additive elements did not affect the dissolution of the protective surface film. The same polarization test was conducted on pure Mg, and the results were compared with those of the β-phase. The anodic regions of the two polarization curves had different profiles. It was confirmed that the protective surface films formed on the pure Mg and β-phase had different properties.

Fig. 7 Polarization curves of single β samples measured in 0.1 M NaCl (pH 11) solution at 298 K. Fullsize Image
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