The inhibitive action of the extract of Picralima nitida leaves toward 1.0 M HCl corrosion of aluminum was examined. Gravimetric (weight loss), potentiodynamic polarization and electrochemical impedance spectroscopy techniques were used in the corrosion inhibition process. In all the method used, the P. nitida leaves extract acted as good corrosion inhibitor of aluminum in 1.0 M HCl solution. Maximum inhibition efficiency of 84.09% was obtained with inhibition concentration of 1.2 g/l. It showed that the extract of P. nitida leaves has excellent inhibitive ability for the corrosion inhibition process. The values of kads are relatively small indicating that the interaction between the adsorbed extract of picralimanitida molecules and aluminum surface is a physical process. The P. nitida extract protected the aluminium against pitting corrosion. The level of protection increases with increasing extract concentration. The P. nitida leave extract inhibited both cathodic and anodic reactions and acted as mixed-type inhibitor.
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