J Mater Sci Technol ›› 2007, Vol. 23 ›› Issue (03): 353-358.

• Research Articles • Previous Articles     Next Articles

Corrosion of Artificial Aged Magnesium Alloy AZ80 in 3.5 wt pct NaCl Solutions

Rongchang ZENG, Enhou HAN, Wei KE   

  1. Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China...
  • Received:2006-02-21 Revised:2006-06-14 Online:2007-05-28 Published:2009-10-10
  • Contact: Rongchang ZENG

Abstract: The corrosion morphologies of aged magnesium alloy AZ80 were investigated by immersion corrosion tests, scanning electron microscopy (SEM), electrochemical measurement. The T5 heat treatment was carried out in a vacuum furnace, holding for 16 h at 177℃, and then cooling in air. The results showed intergranular corrosion (IGC) occurred as an aged AZ80 sample was immersed in 3.5 wt pct NaCl aqueous solution for 1 h and the narrow path attack progressed predominantly along the bulk β phase in the grain boundaries or took place in the eutectic areas. IGC was attributed to the network distribution of β phase along the grain boundaries, the depleted aluminium in the precipitation areas and the breakdown potential.

Key words: Magnesium alloy, AZ80, Intergranular corrosion, NaCl solution