STUDY OF IRON ELECTRODISSOLUTION IN CARBONATE BICARBONATE SOLUTIONS BY ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY

被引：24

作者：

CASTRO, EB

VILCHE, JR

机构：

[1] Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de la Plata. Sucursal 4, 1900 La Plata

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1992年 / 323卷 / 1-2期

关键词：

D O I：

10.1016/0022-0728(92)80013-T

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The iron electrodissolution reaction in carbonate/bicarbonate solutions covering a wide range of electrolyte compositions was investigated by electrochemical impedance spectroscopy. Impedance diagrams and stationary polarization curves obtained with rotating iron disc electrodes at different rotation speeds were interpreted in terms of a reaction mechanism including the formation of adsorbed Fe(I) and Fe(II) intermediates. The surface concentration of HCO3- ions determined by hydrodynamic conditions and the electrolyte bulk concentration is mainly responsible for the parallel formation of soluble Fe(II) species through the dissolution of both Fe(I)ad and Fe(II)ad intermediates. The relative contribution of these processes depends on the electrode potential.

引用

页码：231 / 246

页数：16

共 31 条

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