Effect of TiB2 on the Corrosion Resistance Behavior of In Situ Al Composites

This research focuses on a detailed investigation for understanding the corrosion behavior of A356 Al alloy-based metal matrix composites reinforced with in situ TiB2 particles. The aforesaid newer composite samples were fabricated by adopting in situ technique using halide salts by stir casting route under various pouring temperatures of 750 degrees C, 780 degrees C and 810 degrees C maintained at a constant holding time of 20 min. The so-developed Al MMC samples were then subjected to microstructure and electrochemical studies. Surface morphology of samples showcases for the formation of TiB2 particles over and above the surface of fabricated composite specimens. Corrosion behavior of the samples were investigated exhaustively by using Tafel polarization and electrochemical impedance spectroscopy under 3.5 wt% NaCl solution. The attained results depict that whenever there is a gradual increase in pouring temperature, substantial improvement in the corrosion resistance of developed samples is also evidenced.