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98044 FLOW LOOP STUDIES OF THE RELATIONSHIP BETWEEN LIMITING CURRENTS AND CO2/H2S CORROSION OF CARBON STEEL.

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Product Number: 51300-98044-SG
ISBN: 98044 1998 CP
Author: Jon Kvarekval
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Corrosion measurements on AISI 1010 carbon steel were performed in a glass/titanium flow loop, containing a single-phase test fluid of distilled water, 3 % in NaCl saturated with CO2 or a CO2/H2S gas mixture. The tests were run at temperatures from 25 to 90°C and flow velocities ranged from 0.25 to 2.5 m/s. Corrosion rates were calculated from LPR and tafel extrapolations. Steady-state corrosion currents were compared to cathodic limiting diffision currents obtained under corresponding conditions. The limiting currents were calculated from potentiodynamic sweeps carried out on platinum. Limiting current plateaus were easily seen at pH values below 5, but vanished with increasing PH. Results show a linear correlation between the measured corrosion rates and the limiting currents, both with and without H2S present. With further research and development on this field, the limiting diffusion current technique can be used in predicting corrosivity of CO2/H2S-containing media and other aqueous environments, as well as for ‘in-situ’ corrosion monitoring. Keywords: CO2/H2S corrosion, flow loop experiments, mass transport.
Corrosion measurements on AISI 1010 carbon steel were performed in a glass/titanium flow loop, containing a single-phase test fluid of distilled water, 3 % in NaCl saturated with CO2 or a CO2/H2S gas mixture. The tests were run at temperatures from 25 to 90°C and flow velocities ranged from 0.25 to 2.5 m/s. Corrosion rates were calculated from LPR and tafel extrapolations. Steady-state corrosion currents were compared to cathodic limiting diffision currents obtained under corresponding conditions. The limiting currents were calculated from potentiodynamic sweeps carried out on platinum. Limiting current plateaus were easily seen at pH values below 5, but vanished with increasing PH. Results show a linear correlation between the measured corrosion rates and the limiting currents, both with and without H2S present. With further research and development on this field, the limiting diffusion current technique can be used in predicting corrosivity of CO2/H2S-containing media and other aqueous environments, as well as for ‘in-situ’ corrosion monitoring. Keywords: CO2/H2S corrosion, flow loop experiments, mass transport.
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