A corrosion study has been made using the electrochemical current and potential noise technique, polarization curves and conventional weight loss method to determine the corrosion resistance of a carbon steel exposed to LiBr-H2O (50% wt.) corrosive solution at 25, 50, 60, 70 and 80°C. From the noise measurements, the resistance noise (Rn) was determined, and then the Stern-Geary equation and Faraday’s Law were used to determine the mass loss. The results indicated that the corrosion rates increased with temperature. SEM observations of the corroded samples indicated that the carbon steel suffered localized corrosion; these results were according to the pitting index obtained from the current time series data. To support the corrosion mechanism, EDS analysis of the corrosion products were also made. Through the polarization curves, the Tafel slopes were obtained together with some qualitative corrosion characteristics of the carbon steel.

Subject
Electric current, Materials, Corrosion currents, Corrosion rate, Electrochemical noise, Mass loss, Polarization curves, Corrosion products, Electrochemical current, Weight loss, Pitting, Carbon steel, Electrode potential
Keywords:
Carbon steel, electrochemical noise, pitting corrosion, lithium bromide
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2008
Association for Materials Protection and Performance (AMPP)
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