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The corrosion of aluminium in 1M HClO 4 at 40°C has been investigated using the potentiodynamic polarisation technique. The effect of various inorganic additives has been investigated. It was found that NO 3 , NO 2 and SCN anions exhibit an inhibiting action on acid corrosion of aluminium by reducing the general corrosion rate as well as raising the pitting potential E p . It was found that CrO 2 4 ions were unique in demonstrating a remarkably high inhibiting action but their in uence on the pitting potential was less pronounced than that of the group above. On the other hand, added halides induced an accelerating effect on the corrosion rate and lowered the pitting potential. However, SO 2 4 ions do not show any signi cant effect on the corrosion behaviour of Al in 1M HClO 4 . The results have been interpreted on the basis of the adsorption mechanism followed by incorporation into the native lm.