Author(s)

Zaki Ahmad, Abdul Aleem B. Aleem, Mohammad Abbas

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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.

Corrosion, Polarization, Passive, Pitting, Strengthening Effect, Pinning, Grain Boundaries, Precipitates, Films, Passive Layers

Ahmad, Z. , Aleem, A. and Abbas, M. (2011) Effect of Scandium Doping on The Corrosion Resistance and Mechanical Behavior of Al-3Mg Alloy in Neutral Chloride Solutions. Materials Sciences and Applications, 2, 244-250. doi: 10.4236/msa.2011.24031.