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 60 µA/cm² in 5 g/L solutions to a maximum of 185 µA/cm² in 15 g/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 10 vol.% oil where the chloride content effect remained relatively the same. Adsorption governed the interfacial corrosion interactions in OCP conditions. Some EIS experiments demonstrated an agreement with the polarization results without confirming that threshold effect of chloride on charge transfer.
An electrochemical investigation on the effect of the chloride content on CO2 corrosion of API-X100 steel
Elektrochemische Untersuchung des Chloridgehalt-Einflusses auf die CO2-Korrosion von Stahl API-X100
Corrosion Science ; 64 ; 37-43
2012
7 Seiten, 8 Bilder, 2 Tabellen, 27 Quellen
Article (Journal)
English
hochfester Stahl , Rohrstahl , unlegierter Stahl , Korrosionsgeschwindigkeit , Pipeline , Kohlendioxid , Konzentrationseinfluss , Chlorid , Korrosionsstrom , Polarisationskurve , Dieselkraftstoff , Öl-in-Wasser-Emulsion , Korrosionsmechanismus , anodische Reaktion , kathodische Reaktion , elektrochemische Impedanzspektrometrie , Korrosionspotenzial , Adsorption , Temperatureinfluss
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