Abstract
Data on the inhibition of corrosion of iron by methyl pyridines in HCl, H2SO4 and H2S solutions, by para-substituted anilines in HCl solution, and by ortho-substituted benzimidazoles in HCl solution, and on the inhibition of corrosion of aluminium by methyl pyridines have been analysed in terms of the Hammett equation and in terms of a new equation relating the degree of inhibition (log I/I0) with the fraction of the electronic charge due to the substituent in the inhibitor molecule (ΔΔN). The new relationship has been found to be useful in predicting new inhibitors offering a greater degree of inhibition than the currently known inhibitor systems.
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