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Abstract
It has been shown that electrochemical processes having more than one steady state can be studied by a generator with negative impedance. In this paper we describe a new regulating device composed from a potentiostat and a simple additive circuit; a voltage proportional to current is introduced in the reference branch of the potentiostatic circuit. Experimental data are presented for an equivalent cell (tunnel diode+resistor) and for a zinc electrode polarized in alkaline medium. The Z-shaped curve thus obtained exhibits a quasi-reversible transition between active and passive state. So, the mechanism proposed by Gabrielli et al. for anodic polarization of iron in acid medium will probably hold for zinc “passivation”.
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