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Electrochemical noise generated during stress corrosion cracking in high-temperature water and its relationship to repassivation kinetics
Published in Stefan Ritter, Anders Molander, Corrosion monitoring in nuclear systems: research and applications, 2017
Rik-Wouter Bosch, Marc Vankeerberghen, Serguei Gavrilov, Steven Van Dyck
Electrochemical noise (EN) is a generic term used to describe spontaneous fluctuations of potential or current, which occur at the surface of freely corroding electrodes that can be picked up by a suitable electrode arrangement. Distinction is made between electrochemical potential noise and electrochemical current noise. Electrochemical potential noise is the fluctuation in the electrochemical potential of an electrode relative to a reference electrode, whereas electrochemical current noise is the fluctuation in an electrochemical current.
Monitoring and Inspecting Biofouled Surfaces
Published in A. K. Tiller, C. A. C. Sequeira, Microbial Corrosion, 2021
S. W. Borenstein, G. J. Licina
The electrochemical noise technique measures fluctuations of the potential and the current as a function of time. It is very good for on-line applications and has good possibilities for real-time monitoring of MIC. It has also been used in field applications including service water system applications where MIC has been observed [60-63].
Effect of cathode pulse square-wave on the microstructure and corrosion resistance of PEO coatings of AZ91D magnesium alloy prepared in the Na2C4H4O6–KF–Na2SiO3 system
Published in Corrosion Engineering, Science and Technology, 2022
Lingfei Meng, Wei Zhang, Song Zhang, Jifu Zhang, Chunhua Zhang, Yun Ye, Zebin Bao, Fuhui Wang
Electrochemical noise analysis is unique in that this measurement enables the rate of the corrosion process to be monitored in real-time. EN is produced without any external perturbations to the system and its quantitative analysis results based on a stochastic description of pitting can take into account both pitting initiation and pitting growth [28,29]. Pitting corrosion has been considered the main corrosion type of magnesium alloy in corrosive media containing Cl− ion. The description of pitting initiation and growth for PEO coating of magnesium alloys in corrosive media is very useful for evaluating the protective ability of PEO coatings, so, in this paper, electrochemical noise was attempted to character corrosion behaviour of the coatings in 3.5 wt-% NaCl solution.
Algorithms for the Magnetic Assessment of Proton Exchange Membrane (PEM) Fuel Cells
Published in Research in Nondestructive Evaluation, 2018
Magnetic field imaging may also be performed while recording intrinsic magnetic and electrochemical noise. Note the distinction between unwanted noise that is environmental, or introduced by electronics and software gradiometers, from intrinsic electrochemical noise of interest. Noise measurements are probably best suited for on-site inspection because they are rapid, noninvasive, and can be applied to individual cells in a stack. Magnetic noise measurements can be made when it is not desirable to make direct electrical contact with the cell. Electrochemical noise analysis has more recently been demonstrated as a tool for PEM fuel cell diagnosis [17]. Much has also been reported on the technique of impedance spectroscopy for PEM fuel cell health monitoring [18] including the detection of membrane drying, fuel cell flooding [19], membrane poisoning [20], and along with other fuel cell NDE techniques [21].
Corrosion monitoring at the interface using sensors and advanced sensing materials: methods, challenges and opportunities
Published in Corrosion Engineering, Science and Technology, 2023
Vinooth Rajendran, Anil Prathuru, Carlos Fernandez, Nadimul Haque Faisal
Electrochemical noise (EN) is a passive technique to sense localised corrosion behaviour in low moisture conditions and evaluate corrosion rate at the interface. Electrochemical current noise (ECN) and electrochemical potential noise (EPN) methods are used to analyse various records to determine the interface corrosion behaviour. These two EN methods can be run separately or simultaneously. The current noise can measure the current variation between the working electrode and the counter electrode. The current variations can be higher in the wet interface condition compared to the dry interface condition. As shown in Figure 5a, the potential noise fluctuations are measured between the working electrode and the reference electrode potential noise [17,80,82–84].