Study of corrosion of carbon steel API 5L (X60) in NaHCO₃/NaCl solutions by electrochemical noise and impedance measurements

Authors: Neshati, J.; Masiha, H. P.; Mahjani, M. G.; Jafarian, M.

Source: Corrosion Engineering, Science and Technology, Volume 42, Number 4, December 2007 , pp. 371-376(6)

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Abstract:

Electrochemical noise (EN) measurement and electrochemical impedance spectroscopy (EIS) were employed to study the corrosion behaviour of carbon steel API 5L (X60). The base solution was deaerated aqueous 0·5M bicarbonate to which chloride ion (NaCl) was added in concentrations ranging from 0·05 to 0·3M; potentiodynamic polarisation measurements were made in parallel. The time series current and potential noise were transformed into the frequency domain by fast Fourier transformation and their power spectral densities (PSDs) at specified frequencies were determined and compared with the EIS and polarisation results. The PSDs of the potential and of the current and roll-off slope varied with the concentration of Cl^? ion. Parameters such as noise resistance R_n and the skewness and kurtosis of potential and current fluctuations have been determined from the statistical analysis in the time domain. The relationship between polarisation resistance and noise resistance has been investigated. The comparison of R_p and R_n showed that R_n was generally much smaller than R_p. The characteristic charge and characteristic frequency increased and decreased respectively with the addition of Cl^? ion.Electrochemical noise (EN) measurement and electrochemical impedance spectroscopy (EIS) were employed to study the corrosion behaviour of carbon steel API 5L (X60). The base solution was deaerated aqueous 0·5M bicarbonate to which chloride ion (NaCl) was added in concentrations ranging from 0·05 to 0·3M; potentiodynamic polarisation measurements were made in parallel. The time series current and potential noise were transformed into the frequency domain by fast Fourier transformation and their power spectral densities (PSDs) at specified frequencies were determined and compared with the EIS and polarisation results. The PSDs of the potential and of the current and roll-off slope varied with the concentration of Cl^? ion. Parameters such as noise resistance R_n and the skewness and kurtosis of potential and current fluctuations have been determined from the statistical analysis in the time domain. The relationship between polarisation resistance and noise resistance has been investigated. The comparison of R_p and R_n showed that R_n was generally much smaller than R_p. The characteristic charge and characteristic frequency increased and decreased respectively with the addition of Cl^? ion.

Keywords: ELECTROCHEMICAL IMPEDANCE; POTENTIODYNAMIC POLARISATION; ELECTROCHEMICAL NOISE; CARBON STEEL CORROSION

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174327807X214879

Publication date: 2007-12-01

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