Theory of Organic Corrosion Inhibitors

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Abstract
The corrosion rates of Armco iron in the presence of ring‐substituted anilines were shown to obey a LFER predicated on inhibition by adsorption. Deviations from the adsorption correlation were shown for p‐Toluidine at times greater than 20 hr and for m‐toluidine in excess of 30 hr. These deviations tended toward an acceleration which has been attributed to an oxidative propensity of the “surface chelate.” Since 0‐Toluidine was found to follow the adsorption correlation, it was concluded that adsorption of the organic was parallel to the electrode surface. Adsorption data on Hg where the orientation was shown to be parallel to the electrode surface were also correlated by the LFER theory.

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