Published Paper Details:

In the present investigation, the corrosive behavior of Al6061-SiC / graphite particulate composites prepared by liquid metallurgy has been experimentally assessed in neutral chloride medium, acid chloride medium and acid sulphate medium using Tafel extrapolation technique and electrochemical impedance spectroscopy (EIS). Surface morphology of the sample was examined using scanning electron micrographic and energy dispersive X-ray method. The results obtained from Tafel extrapolation technique and EIS were in good agreement. Polarization studies indicates an increase in the corrosion resistance in composites compared to the matrix alloy. Presence of graphite in the hybride composite activates the corrosion of Al6061 matrix alloy due to the occurrence of galvanic corrosion. EIS study reveals that the polarization resistance increase with increase in SiC content in composites, thus confirming improved corrosion resistance in composites.