Abstract
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) 2 solutions with the addition of chloride salt of concentrations up to 1 M. The comparative results indicate that the initial reactions of Fe(OH) 2 formation at the inner part of the passive layer level (Fe 3O 4) 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 Fe 2+/Fe 3+ redox reactions take place. At high positive potential the breakdown of passivity is also influenced by both Cl − ion and cation present in solution.
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