INVESTIGATION OF PASSIVE LAYERS ON IRON AND IRON-CHROMIUM ALLOYS BY ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY

被引：75

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, 1990 La Plata, Sucursal 4

来源：

ELECTROCHIMICA ACTA | 1993年 / 38卷 / 11期

关键词：

PASSIVE LAYERS; ANODIC OXIDE FILMS; IRON; IRON CHROMIUM ALLOYS; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; ELECTRON TRANSFER REACTIONS;

D O I：

10.1016/0013-4686(93)80291-7

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The semiconductor properties of passive layers anodically generated on Fe and Fe-Cr alloys in near neutral aqueous solutions, varying, at our convenience, the oxide formation potential E(f), were investigated using electrochemical impedance spectroscopy (EIS). The impedance of the system is characterized by two capacitive contributions in the 1 mHz-65 kHz frequency range. From the Mott-Schottky plots the flat band potential E(FB) and the donor concentration N(D) can be determined as a function of E(f) and Cr content. A comparative study of the kinetics of the ferro-ferricyanide electron transfer reaction on passive Fe and Fe-Cr substrates were performed to analyse the relation between the electronic properties of the anodic oxide layers and the mechanism of the redox couple electrode reaction.

引用

页码：1567 / 1572

页数：6

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