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Abstract
The passivation and dissolution of pure iron in NaOH solutions (1 M–10M) have been studied at 30°, 60° and 80° C by triangular potential sweep voltammetry. The variation of peak height and peak potential with sweep rates for the three anodic peaks in the forward direction and two cathodic peaks in the backward direction when polarized from −1.30 V in 1.0 M NaOH solution, suggest that a monolayer adsorption model holds good. The appearance of limiting currents at higher concentrations of NaOH has been explained in terms of the chemical dissolution of two oxides formed by successive oxidation. The formation of different oxides, hydroxides and solution soluble species under transient conditions has been discussed.
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