Steady-State Anodic Dissolution of Iron
in Neutral and Close-to-Neutral Media

A. Yu. Aleksanyan, A. N. Podobaev, and I. I. Reformatskaya

*FGUP GNTs RF Karpov Research Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 103064 Russia

Received May 6, 2006

Abstract—In neutral and close-to-neutral solutions, which contain no surface-active substances, iron dissolves
via a two-step scheme. The transfer of the first electron across the interface involves water molecules that dis-
sociate during the adsorption; the transfer of the second electron limits the process under steady-state condi-
tions. In parallel, a passivator, namely, adsorbed oxygen is formed via a similar scheme. The passivator is
removed from the surface due to its chemical reaction with hydroxonium ions, water molecules, or hydroxide
ions. The process is adequately described by a mathematical model based on an assumption that the metal dis-
solves from an energy-uniform surface free from passivating species.

PACS numbers: 82.85.Bb

DOI: 10.1134/S0033173207010092

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