| Electrochemical Noise: Electrochemical noise refers to naturally occurring fluctuations in corrosion potential and corrosion current flow. It does not refer to an acoustic measurement. Electrochemical noise (EN) monitoring can be further subdivided into electrochemical potential noise (EPN) measurements and electrochemical current noise (ECN) measurements. The combined monitoring of potential and current is particularly useful. Fluctuations in the corrosion potential can indicate a change in the thermodynamic state of corrosion processes, as for example indicated on a Pourbaix diagram*, while changes in the current noise is an indicator of the corrosion kinetics. The combination of potential and current noise measurements has also been used to estimate corrosion rates; the methodology is related to measuring the well-known polarization resistance Rp. More information on noise analysis
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