In this work we characterized the interfacial reactions produced by a 1018 steel surface at different NaCl concentration, time, and rotation speed when exposed to CO2 containing aqueous solutions. The 1018 steel specimens were tested using the electrochemical impedance technique in 3 wt.% and 4 wt.% NaCl at 80°C. As indicated by the Nyquist and Bode plots the charge transfer resistance magnitude and phase angle increased with time. The 1018 steel exposed to a higher concentration of sodium chloride (4%wt. NaCl) also indicated an increase in charge transfer resistance. This suggests that an increase in exposure time and sodium chloride concentration influenced the dissolution mechanism for 1018 steel. We found that an increase in the rotation speed resulted in a decrease in the resistance; this might be attributed to a thinner or less compact carbonate layer at higher rotation speed. The SEM images show that an increase in the sodium chloride concentration resulted in more compact and finer grains.

Subject
Scanning electron microscopy, Electrochemical impedance spectroscopy, Steel surfaces, Materials, Iron carbonate, Adsorption, Sodium chloride, Dissolution, Corrosion reactions, Acidity, Interfaces, Salt concentration, Steel
Keywords:
EIS, CO2, intermediate reactions
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2013
Association for Materials Protection and Performance (AMPP)
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