CHARACTERIZATION OF CHROMATE-PHOSPHATE CONVERSION LAYERS ON AL-ALLOYS BY ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY (EIS) AND OPTICAL MEASUREMENTS

被引：21
作者：
ENDE, D
KESSLER, W
OELKRUG, D
FUCHS, R
机构：
[1] UNIV TUBINGEN,INST PHYS & THEORET CHEM,W-7400 TUBINGEN,GERMANY
[2] ALUSUISSE LONZA GMBH,CH-8212 NEUHAUSEN,SWITZERLAND
来源：
ELECTROCHIMICA ACTA | 1993年 / 38卷 / 17期
关键词：
CORROSION; ALUMINUM; CONVERSION COATING; LUMINESCENCE; IMPEDANCE SPECTROSCOPY;
D O I：
10.1016/0013-4686(93)80155-S
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Chromate conversion layers of a thickness ranging from 20 to 250 nm on Al-alloys are characterized by EIS in 0.1 M Na2SO4 and optical measurements. A model is derived from these data which describes the corrosion mechanism of these samples. The main components of the equivalent circuit can be attributed to the diffusion barrier and to defect sites within the layer. Optical spectroscopy and electrogenerated chemoluminescence confirm these main factors independently of EIS.
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收藏
页码：2577 / 2580
页数：4
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