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Comparative study of the passivity and the breakdown of passivity of polycrystalline iron in different alkaline solutions

✍ Scribed by O.A. Albani; L.M. Gassa; J.O. Zerbino; J.R. Vilche; A.J. Arvia

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 920 KB
Volume: 35
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(90)85018-i

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✦ Synopsis

The passivity and passivity breakdown of polycrystalline iron is investigated through electrochemical methods complemented with ellipsometry, by employing plain 0.04 M NaOH and saturated Ca(OH), solutions with the addition of chloride salt of concentrations up to 1 M. The comparative results indicate that the initial reactions of Fe(OH), formation at the inner part of the passive layer level (Fe,O,) are only slightly influenced by either the cation or the presence of Cl-ion in solution, in contrast to their large influence at the outer part of the passive layer (hydrous FeOOH species) where Fe2+/Fe3+ redox reactions take place. At high positive potential the breakdown of passivity is also influenced by both Clion and cation present in solution.

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