Archives of Metallurgy and Materials (Mar 2017)

The role of β(Al12Mg17) phase on corrosion behavior of the AZ91 alloy in NaCl aqueous solution

  • Hatakeyama M.,
  • Shimono K.,
  • Iwashima D.,
  • Saikawa S.,
  • Sunada S.

DOI
https://doi.org/10.1515/amm-2017-0021
Journal volume & issue
Vol. 62, no. 1
pp. 155 – 158

Abstract

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The effect of the β phase (Al12Mg17) on the corrosion resistance in a NaCl solution was investigated by electro chemical methods.Volume fraction of β phase in each specimen was controlled systematically by isothermal annealing at 473 K as 0%, 4%, 22% and 100 %, respectively. Although α phase shows lower corrosion current density than that of β phase, the α/β mixed phase specimen showed higher corrosion current density than that of α phase.It strongly suggests that β phase act as cathodic electrode in the alloys.

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