The Dissolution Mechanism of Iron in Chloride Solutions

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We have measured the polarization curve and the electrochemical impedance for the dissolution of iron in sodium chloride solutions of varying pH of [xNaCl + yHCl, x + y = 4.5M] pH = 0, 1, 2, 3, 4. The polarization curves are comparable with those of previous workers and exhibit two distinct Tafel slopes: 75m V/s at low polarization, and 40 mV/decade at high polarization for pH = 0, 1, 2, 3. The impedance diagrams exhibit a high frequency capacitive loop, followed by one inductive loop at low overpotentials, and a further inductive loop at high overpotentials. We have interpreted these phenomena in terms of two parallel dissolution paths.

Original languageEnglish
Pages (from-to)2240-2244
Number of pages5
JournalJournal of the Electrochemical Society
Issue number11
Publication statusPublished - 1 Jan 1986

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