Electrochemical noises during corrosion processes

Electrochemical noise measurement (ENM) has attracted attention since it was first applied to anticorrosion coatings in the late 1980s [35, 36]. The noise consists of fluctuations in the current or potential that occur during the course of corrosion. The underlying idea is that these fluctuations in current or potential are not entirely random. An unavoidable minimum noise associated with current flow will always be random. However, if this minimum can be predicted for an electrochemical reaction, then analysis of the remainder of the noise may yield information about other processes, such as pitting corrosion, mass transport fluctuations, and the formation of bubbles (i.e., hydrogen formed at the cathode). 

Provided that the individual events are independent of other events such as the stochastic processes, it has been known that the shot noise analysis is applicable to the individual events. In the recent literature, the shot noise theory has been applied to the analysis of electrochemical noise signals [33]. If we assume that shot noise is produced during breakdown of the passive film, pit initiation and hydrogen evolution, the average corrosion current... 

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