Abstract
Increase of the covering power of the surface of iron in perchloric acid solution caused by the synergistic action of organic anions and amines was measured by electrical double layer capacity at the interface. The covering power increased by the addition of amine into Fe-0.5N-HClO4 system containing sodium propionate, but it decreased by the addition of a larger amount of amine. These findings should be interpreted as adsorption of amines as ammonium ions over the previously adsorbed propionate ions; however, as the results of electrostatic interaction between anions and cations, anions would migrate from the iron surface together with ammonium cations with the increase of amine concentration.Accordingly, the synergistic effects of amines and anions would be attributed to the overlapped adsorption of ammonium ions over the anions, and these effects should be quite distinct from the coadsorption mechanism of amine and halide ions.
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