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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.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 1

155--158

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.