Inhibition of Aluminium Corrosion in Hydrochloric Acid

Abstract

The inhibitive effect of oximes, P-diketones and hydrazides, on the corrosion of aluminium in 2M HC1 has been investigated galvanostatically. The results suggest that, in presence of inhibitors, the anode is preferentially polarized under the influence of an external current. The order of decreasing inhibition efficiency among the three groups of compounds is: oximes > P-diketones > hydrazides. The inhibitors appear to function through a Temkin adsorption isotherm. The free energy of adsorption AG°a is.also computed and discussed.