Abstract
Al-6061 alloy based nanocomposites were synthesized using sol-gel prepared nanoparticles of α-alumina in their varying weight percentages (0, 0.5, 1.5, and 2.5 wt%) via powder metallurgy route. The synthesized nanocomposites were sintered and heat treated under solutionized and T6 conditions. Afterwards, electrochemical corrosion tests were performed in 3.5% NaCl solution to see the effect of nanoparticle addition on the corrosion behavior of the composites. Heat treatment results indicate that solutionized composites exhibit better corrosion resistance as compared to the composites treated under sintered condition. Heat treatment under T6 condition showed poorest corrosion resistance. Nanocomposite reinforced with 0.5 wt% of nanoparticles showed excellent corrosion resistance than that of 1.5 wt% of nanoalumina incorporated composite. After 2.5 wt% incorporation of nanoparticles, the corrosion rate of the composite becomes very high even more than that of the base alloy. Increase of nanoparticle concentration was found to increase their agglomeration at the grain boundary region that increases porosity in the composite. This ultimately increases the corrosion reaction because of the enhanced chemical reactivity. The microstructural examination of the synthesized nanocomposites were found in good agreement with the corrosion rate determined from electrochemical tests.
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