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Abstract
Our previous work showed that regulation by potentiostat is not adequate for the thorough control of the transition between active and passive states of iron in acid medium and that only a regulation device having a negative output impedance permits a continuous and reversible transition[l]. The experimental results are compared in this short communication with those of simulation calculation based on the reaction model proposed. The polarization curves obtained with different rotation speeds of a disc electrode showed that the diffusion plateau precedes the region of polarization curve corresponding to the passivation. One notes that in this potential zone, there are three steady current values, at a given potential, since the polarization curve is Z-shaped. These results relevant to the steady state behaviour of iron in acid medium are completed by the study of its
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