Study of corrosion using electrochemical noise measurement

Many corrosion processes, whether localized or uniform, are stochastic in nature. This often complicates the use of the other electrochemical techniques described above, such as polarization curves or impedance measurements, for example. However, we can also take advantage of the random signals generated by these phenomena by "listening" to the galvanic system without disturbing it, through analysis of spontaneous fluctuations in current or potential, commonly known as "electrochemical noise". Indeed, imposing a disturbance on the potential or current can alter the corrosion process under study. This simple "listening" to the system has been widely used since the 1970s to study corrosion phenomena, both in the laboratory and for on-site monitoring.

However, the use of this technique comes up against two problems, one due to the difficulties involved in measuring...