Comparative Electrochemical Noise Study of the Corrosion of Different Alloys Exposed to Chloride Media

Abstract

This paper describes the corrosion behavior of aluminum, copper, and mild steel when exposed to chloride media using both electrochemical noise analysis (ENA) and electrochemical impedance spectroscopy (EIS). Analysis of electrochemical noise (EN) data demonstrated the need for removal of drifts in both potential and current fluctuations. Statistical analysis such as noise resistance, localization index, skewness and kurtosis has been evaluated. Noise resistance showed a good agreement with polarization resistance. Fast Fourier transformation (FFT) has been applied to convert EN data from the time domain to the frequency domain. Spectral noise plots showed a good agreement with impedance spectra for the different alloys determined at the same exposure time. Spectral and statistical analysis can extract useful information from EN data.

Electrochemical Noise Measurements of Advanced High-Strength Steels in Different Solutions

“…values close to zero suggests general corrosion, while L.I. values greater than 0.1 are related to localized corrosion behavior [82]. Therefore, the values obtained in the presented study indicate that the L.I., can be used to differentiate between different types of corrosion, as reported in [54] where transients observed were related to localized corrosion with L.I.…”

Electrodeposited Organic Layers Formed from Aryl Diazonium Salts for Inhibition of Copper Corrosion

“…The kurtosis of the normal distribution is 3. Higher kurtosis values (>3) indicate a sharper distribution of the individual values than the normal distribution (few extreme values form the mean, but with higher deviance), while lower kurtosis values (<3) indicate a flatter distribution (more values different from the mean, but less extreme differences) [ 28 ].…”

A Recent Progress of Steel Bar Corrosion Diagnostic Techniques in RC Structures

“…Furthermore, EN is used to investigate the inhibition performance of novel inhibitors for steel, like LPR and EIS [164]. On the other hand, Nagiub et al [165] used EN and EIS techniques to investigate corrosion behavior of steel to obtain the connection between R p and noise resistance Rn, in which Rn was generally much smaller than R p . In some media of low ionic conductivity, such as crude oil, where it is difficult to use electrochemical techniques due to continuous current experiments, EIS and EN have been proposed as viable methods [166].…”