|
Steady-State Anodic Dissolution of Iron in Neutral and Close-to-Neutral Media |
|
12.09.2008 г. |
|
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 dissociate 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 dissolves from an energy-uniform surface free from passivating species. PACS numbers: 82.85.Bb DOI: 10.1134/S0033173207010092
|