Abstract
This research argues that the corrosion rate for high strength steel in CO2-saturated solutions reaches a maximum at a threshold chloride content. At 20°C, the corrosion rates increased from 60μA/cm2 in 5g/L solutions to a maximum of 185μA/cm2 in 15g/L solutions, and then became less in the more concentrated solutions. The anodic dissolution accelerated at 90°C and the cathodic reactions decelerated with adding 10vol.% oil where the chloride content effect remained relatively the same. Some EIS experiments demonstrated an agreement with the polarization results without confirming that threshold effect of chloride on charge transfer.
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