Abstract
It has been shown that breakdown of passivity of steel in borax solution + halide ions takes place only above the “break-through” potential. This potential becomes more positive with increase in borax concentration and more negative with increase in Cl − concentration. Breakdown results in the appearance of spots of corrosion product below which pits are formed. At certain ratios of borax/Cl −, potential oscillations are observed which occur only if corrosion takes place through formation of pits, and if the pits remain active for a sufficiently long period. During potentiostatic experiment, current oscillations are observed just below the break-through potential. The results are explained in terms of a model which envisages that adsorption of borate ions is necessary for the maintenance of passivity in this system.
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