Corrosion Behavior of Magnesium & magnesium Alloys in NaCl Solutions

It was investigated that corrosion behavior of magnesium magnesium alloys(AZ31, AZ91D)in NaCl solution of pH value of 12 as well as the concentration of 5 %. The corrosion behavior was described through analyzing corrosion rate and morphology of the corroded surface. Corrosion mechanism was also discussed. With corrosion time increases, it exhibits a sharp decrease and then slowly lower to a stable value that the corrosion rate of magnesium and AZ31 as well as AZ91D magnesium alloy. Meanwhile, with Al elements concentration increases, the corrosion rate of magnesium alloy decreases. Thus,AZ91D magnesium alloy displays better corrosion resistance than AZ31 magnesium alloy.