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Potential and current fluctuations spontaneously generated by corrosion reactions are known as electrochemical noise. In certain cases, good correlation can be obtained between the results of the spectral analysis of electrochemical noise and corrosion rate and type. However, because of the chaotic nature of corrosion processes, a special mathematical treatment may be needed. In the present study, the electrochemical noise measured on various metals was treated by methods known from the theory of chaos, and the results were compared with the results of spectral analysis. It has been shown that the chaotic characteristics of electrochemical noise are related to corrosion type, whereas the rate of corrosion has no influence on the fractal dimensions of the noise.
electrochemical noise measurement, power-spectrum density, chaos, fractal analysis
Researcher, Institute for Testing and Research in Materials and Structures, Ljubljana,
Researcher, Faculty of Mechanical Engineering University of Ljubljana, Ljubljana,