Electrochemical noise analysis corrosion resistance

In summary, the study by Zhou et al. " ° confirmed the findings of the prior work by Liu et al., ° that electrochemical noise analysis is an effective method for monitoring the corrosion rate of metals and alloys in high subcritical and supercritical aqueous solutions. The method is readily calibrated and, when used to estimate the noise resistance, and yields a quantity (the polarization resistance) that is directly related to the corrosion current density and hence the corrosion rate through the Stem-Geaiy relationship. This... 

Noise analysis has been particularly fruitfiil in characterizing various aspects of hydrodynamics, as noted above for the specific case of corrosion processes. First of all, multiphase flows were investigated, either gas/water [78], solid/liquid [79, 80], oil/water [81] or oil/brine [82]. In these flows, fluctuations are due primarily either to fluctuations in transport rates to an electrode or to fluctuations in electrolyte resistance. If one phase preferentially wets the electrode, then there may be fluctuations due to variation in the effective electrode area. Each of these phenomena has a characteristic spectral signature. Turbulent flows close to a wall have been investigated by means of electrochemical noise by using electrochemical probes of various shapes, by measuring the power spectral density of the limiting diffusion current fluctuations [83-86],... 

Boron-doped diamond presents another attractive material with low and stable background current and noise over a wide potential range, corrosion resistance, high thermal conductivity, and high current densities. Usually no mechanical or electrochemical pretreatment of BDD film electrode is needed. Therefore, BDD film electrodes find use also in the area of environmental analysis for organic explosive determinations. BDD-based electrochemical detector allowed, e.g., amperometric detection of 2,4,6-trinitrotoluene, 1,3-dinitrobenzene, and 2,4-dinitrotoluene over the 200-1,400 ppb range, with detection limits at the 100 ppb level. ... 

Bertocci, U., Gabrielli, C., Huet, E. and Keddam, M. (1997) Noise resistance applied to corrosion measurements I. Theoretical analysis. Journal of the Electrochemical Society, 144, 31-37. 

U. Bertocci, C. Gabrielli, F. Huet, and M. Keddam, Noise resistance applied to corrosion measurements 1. Theoretical analysis , J. Electrochem. Soc., 144, 31 (1997). 

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