Abstract
Iron at −40° in acidic solutions of liquid ammonia displays an active region and a passive region. The dissolution reaction is pH-independent and irreversible, the first charge transfer step being rate-determining. Passivation occurs through the adsorption of solvent oxidation products, initially probably the NH 2 ads species. The adsorbed layer is thin, possibly not exceeding one monolayer and is in complete, especially in the more acidic solutions. In the passive region intensive surface roughening takes place. The passive film can be removed partially by cathodic polarisation but complete removal is achieved only by polarisation within the active region. The current maxima in the polarisation curves fall with increasing pH. Likewise the corrosion currents in the passive region are highest in the more acidic solutions. The extent of passivation depends also upon the nature of the anion, being least in solutions containing the fluoroborate ion.
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