Abstract
The electrical double layer capacities at the interface between iron and acid solutions containing organic inhibitors and halide ions were measured as a function of inhibitor concentrations. The degree of surface coverage as calculated from the change in capacity due to adsorption of inhibitors was compared to inhibitor efficiency. These showed a linear relationship which might be used as a means for evaluation of inhibitors. Peaks in coverage-concentration or inhibitor-efficiency-concentration curves are interpreted in terms of a change of mechanism from adsorption to film-forming inhibition. Synergism of amines and halide ions is discussed from a viewpoint of surface charge. A model of co-adsorption using halide ions and organic cations suitably interprets the phenomenon.
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