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
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
收藏
页码:1389 / 1394
页数:6
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