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 Rn 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 Rp and Rn showed that Rn was generally much smaller than Rp. The characteristic charge and characteristic frequency increased and decreased respectively with the addition of Cl− ion.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
