The present research work deals with the corrosion behaviour of 6061 Al-15% (vol) SiC(P) composites. The addition of the reinforcement like SiC to Aluminium has been reported to decrease the corrosion resistance of the matrix due to several reasons, one of them being galvanic action between the reinforcement and the matrix. In the present work, the corrosion behaviour of 6061 Al-15% (vol) SiC(P) composites in KOH at different concentration (0.5M, 1M, 1.5M) and different temperature (300C, 350C, 400C, 450C, 500C) was determined by Tafel extrapolation technique. The inhibition action of 8-Hydroxyquinoline on corrosion behaviour of 6061 Al-15% (vol) SiC(P) composites in KOH at different concentration of inhibitor (200ppm, 400ppm); different concentration of medium (0.5M, 1M,1.5M) and different temperature (300C, 350C, 400C, 450C, 500C) was investigated. The results indicate that corrosion rate of Al-SiC composite in KOH increases as the concentration of medium increases and also as temperature of medium increases. The results indicate that the inhibitor is moderately effective in inhibiting the corrosion of 6061 Al-15% (vol) SiC(P) composites. As the inhibitor concentration increases, the corrosion rate decreases. The surface morphology of the metal surface was investigated using scanning electron microscope (SEM). Activation energy was evaluated using Arrhenius equation, and enthalpy of activation and entropy of activation values were calculated using transition state equation.