Effect of Scandium Doping on The Corrosion Resistance and Mechanical Behavior of Al-3Mg Alloy in Neutral Chloride Solutions
Zaki Ahmad, Abdul Aleem B. Aleem, Mohammad Abbas
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DOI: 10.4236/msa.2011.24031   PDF   HTML     5,464 Downloads   9,480 Views   Citations

Abstract

Scandium addition significantly alters the corrosion resistance and mechanical strength of Al-3 Mg alloys. The addition of 0.3% - 0.4% scandium with 0.14% zirconium has a beneficial effect on the corrosion resistance of the alloy under smoothly stirred condition. Addition of 0.3% Sc significantly suppresses corrosion under dynamic flow conditions. It also creates an optimal strengthening effect on the alloys. The corrosion resistance is attributed to the strong passive layer of Sc2O3 formed on the ultrafine coherent precipitates of Al3Sc. A strong evidence of the pinning of grain bounda-ries by coherent nano Al3Sc precipitates is responsible for the strengthening effect.

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Z. Ahmad, A. Aleem and M. Abbas, "Effect of Scandium Doping on The Corrosion Resistance and Mechanical Behavior of Al-3Mg Alloy in Neutral Chloride Solutions," Materials Sciences and Applications, Vol. 2 No. 4, 2011, pp. 244-250. doi: 10.4236/msa.2011.24031.

Conflicts of Interest

The authors declare no conflicts of interest.

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