Abstract
Aluminum metal matrix composites (MMC) have better mechanical properties than the alloy because of high strength-to-density ratios. In addition these composites exhibit low co-efficient of thermal expansion, high corrosion resistance. Al 6065 is the base metal selected for corrosion studies. Al 6065 MMCs are prepared by stir casting method. MMCs are prepared with reinforcement of particulates such as SiC and graphite. Composites are prepared by adding 2, 4 wt % of SiC particulates and hybrid composite with equal amount of SiC and graphite. Base metal alloy without adding any reinforcement is also casted in the same manner for comparison. Present research work involves the study of corrosion behavior of Al 6065 MMCs and the base metal alloy in different mediums using tafel polarization technique and Impedance. The corrosion medium used is 0.1 M acid chloride, 0.1 M acid sulphate and neutral chloride solution of 3.5%. The study is also compiled by SEM analysis of the corroded samples which depicts the deteriorated surfaces. Results indicate that Al 6065 hybrid composite is resistant towards corrosion because of its low percentage of graphite.
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