Distinction between general and pitting corrosion based on the nonlinear dynamical response of passive iron surfaces perturbed chemically by halides

被引:38
作者
Pagitsas, M [1 ]
Diamantopoulou, A [1 ]
Sazou, D [1 ]
机构
[1] Aristotle Univ Thessaloniki, Dept Chem, Phys Chem Lab, GR-54006 Thessaloniki, Greece
关键词
halide-induced oscillations; general corrosion; fitting corrosion; passive iron-oxide film; point defect model; surface complexes;
D O I
10.1016/S1388-2481(01)00150-3
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
We report on different types of current oscillations induced by fluoride and chloride species in the Fe \H2SO4 electrochemical system. On the basis of the nonlinear dynamical response of the system, certain criteria are deduced, which allow the distinction between general and pitting corrosion. We use a point defect model (PDM) for the description of the iron oxide film along with the formation of surface complexes between the oxide iron cations and halides in order to explain the difference between general and pitting corrosion. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:330 / 335
页数:6
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