Graphene oxide with dopamine functionalization as corrosion inhibitor against sweet corrosion of X60 carbon steel under static and hydrodynamic flow systems

Under static and hydrodynamic conditions, a graphene oxide with dopamine functionalization (DA-GO) was employed as a corrosion inhibitor for X60 carbon steel in a CO2-saturated 3.5 % NaCl solution. Electrochemical methods were combined with surface analytical techniques to assess the inhibitor's performance. At 2 ppm, DA-GO exhibited a high inhibition efficiency of over 90 % according to the results from the potentiodynamic polarization technique. The addition of the inhibitor resulted in an increase in charge transfer resistance at the steel/solution interface. Polarization experiments revealed that DA-GO acts primarily as a mixed-type inhibitor under the static condition and as a cathodic-type inhibitor under the hydrodynamic condition. Adsorption of DA-GO on the steel substrate followed the Langmuir adsorption isotherm, suggesting a combination of physical and chemical adsorption mechanisms. The inhibitor adsorption on the steel substrate was confirmed by surface characterization using SEM, AFM, and XPS techniques.

Automated summary

The study demonstrates that dopamine-functionalized graphene oxide can be used as a corrosion inhibitor for X60 carbon steel under static and hydrodynamic conditions. Electrochemical methods and surface analytical techniques confirm the effective corrosion inhibition of DA-GO in a CO2-saturated NaCl solution, with a combination of physical and chemical adsorption mechanisms.