AN IMPEDANCE SPECTROSCOPY STUDY OF THE ANODICALLY FORMED BARRIER LAYER ON ALUMINUM SUBSTRATES

被引：19

作者：

GERVASI, CA ^{[1
]}

VILCHE, JR ^{[1
]}

机构：

[1] NATL UNIV LA PLATA,FAC CIENCIAS EXACTAS,INST INVEST FISICOQUIM TEOR & APLICADAS,SUCURSAL 4,RA-1900 LA PLATA,ARGENTINA

来源：

ELECTROCHIMICA ACTA | 1992年 / 37卷 / 08期

关键词：

ALUMINUM SUBSTRATES; IMPEDANCE SPECTROSCOPY; ALUMINA BARRIER LAYER; ELECTRONIC PROPERTIES; SEMICONDUCTING BEHAVIOR; THIN PASSIVE LAYERS;

D O I：

10.1016/0013-4686(92)87012-O

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Al 99.996 and Al-0.4% Mn specimens were anodically oxidized in a boric acid-borate solutibn (pH 7.4, 15-degrees-C). The electronic properties of the thin oxide films were investigated using electrochemical impedance spectroscopy in the potential range 0.3 V less-than-or-equal-to E less-than-or-equal-to 1.8 V. The impedance of the system is characterized by two capacitive contributions in the frequency range 0.1 Hz less-than-or-equal-to f less-than-or-equal-to 50 kHz. The dynamic characteristics of the electrochemical system are discussed in terms of a model which accounts for the presence of space charge and surface state effects.

引用

页码：1389 / 1394

页数：6

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