Effectiveness of Ti-micro alloying in relation to cooling rate on corrosion of AZ91 Mg alloy

When AZ91 and its Ti-added alloys were compared under the same cooling conditions, the Ti addition showed notably high corrosion resistance. Electrochemical test results showed that while Icorr values of AZ91 decrease with the increase in the cooling rate, the effect of the cooling rate on Icorr values was much lower in the Ti-added alloy. The corrosion resistance of AZ91 Mg alloy was sensitive towards the cooling rates while Ti-added alloy was not affected much from the cooling conditions.