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The anodic behaviour of iron in acidic solutions of liquid ammonia

✍ Scribed by O.R. Brown; G.F. May

Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
810 KB
Volume
22
Category
Article
ISSN
0013-4686

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✦ Synopsis

Iron at -40" in acidic solutions of liquid ammonia displays an active region and a passive region. The dissolution reaction is pIGindependent and irreversible, the first charge transfer step being ratsdetermining. Passivation occurs through the adsorption of solvent oxidation products, initially probably the NHZ.& species The adsorbed layer is thii, possibly not exceeding one monolayer and is incomplete, especially in the more acidic solutions. In the passive region intmsive surface roughening takes place. The passive film can be removed partially by cathodic polarization but complete removal is achieved only by polarisation within the active regioo. The current maxima in the polarization curves fall with increaing pH. Likewise the corrosion catrents in the passive region are highest in the more acidic solutions. The extent of pa&v&ion depends also upon the nature of the anion, being least in solutions containing the fiuoroborate ion. INTRODUCnON Until recently the anodic behaviour

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