The behaviour of the mixed potential as a function of oxidant concentration and agitation is examined for a variety of corrosion reactions. Using the theory developed in a previous paper, this information is used to elucidate the mechanism of each reaction_ The dissolution of mercury, copper and silver in the presence of ferric ions was studied. For the Fe (IIljCu-SO?-system, it was shown that the anodic dissolution half-reaction was activation cm&o&d and the cathodic half-reaction was diffusion controlled. Changing the anion to Cl-made both half-reactions diffusion controlled. For the Fe(III)-&-NO; system, the anodic half-reaction is diffusion controlled the ferric reduction being activation controlled. In the attack of ferric ions on mercury in nitrate solution, both half-reaotions are activation controlled. The metal oxidation reaction in which silver is oxidized to silver iodide by the triiodide ion was considered. It was shown that the ir drop in the AgI layers had a negligible effect on the corrosion potential. An examination of the bchaviour of the corrosion potential in the Cu (IIbZn meti displacement reaction enabled estimates to be made of the anodio area at various times during the reaction. It was shown that in the first stage of the reaction the anodic area is fairly constant and equal to the geometric area of the zinc. As the second stage is entered, the anodic area suddenly drops to about 3 per cent of the geometric area, at which level it remains constant. NOMENCLATURE Anedic area (mZ) Cathodic area (m*) Concentration of oxidized species in bulk solution (mol m-") Ekctrode potential (V) Standard electrode potential for the anodie reaction (V) Corrosion potential (V) Corrosion potential at zero time (V) Faraday constant (C mol-') Anodii current (A) Cathodic current (A) Constant (A m-') Gas constant (J II&-' K-1) Absolute temperature (K) Volume of raactant solution (m3) Anodic current density (Am-') Standard exchange current density for the anodic rurction (Am-2mol-') Rate constant (m s-' ) Number of electrons involved in the anodic process Number of electrons involved in the cathodic pr-Slope of first order plot (s-I) Time (s) Transfer coefficient of anodic half reaction Transfer coefficient of cathodic half reaction Rotation speed (tad SC')