Sources of electrochemical noise in corroding systems

The electrochemical noise method is reasonably well established as a technique that can estimate corrosion rate through the electrochemical noise resistance or impedance. A more interesting potential application is the identification of the nature of the corrosion process. In this paper, a number of...

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Bibliographic Details
Published inRussian journal of electrochemistry Vol. 42; no. 5; pp. 497 - 505
Main Author Cottis, R. A.
Format Journal Article
LanguageEnglish
Published New York Springer Nature B.V 01.05.2006
Subjects
Corrosion
Corrosion rate
Corrosion resistance
Electrochemical noise
Noise
Shot noise
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Summary:The electrochemical noise method is reasonably well established as a technique that can estimate corrosion rate through the electrochemical noise resistance or impedance. A more interesting potential application is the identification of the nature of the corrosion process. In this paper, a number of corrosion types are examined, and it is concluded that the majority constitute a form of shot noise, possibly with a superimposed baseline current. Methods by which parameters describing the shot noise process can be estimated from the measured data are presented. It appears to be feasible to extract the charge in the shot noise events, and their frequency, providing all of the anodic or cathodic current, is associated with these events. However, the analysis requires a number of assumptions that are not always valid, and these are discussed. Finally, some alternative methods that have been used to identify the type of corrosion are briefly discussed.
ISSN:1023-1935
1608-3342
DOI:10.1134/S1023193506050077