Experiments in a large-scale flow loop provide an example of a somewhat increased corrosion rate under multiphase flow conditions caused by a low concentration of H2S in a CO2 saturated environment. Under operating conditions that prevent scale formation, the addition of 3ppm H2S in the gas phase increased the corrosion rate of AISI C 1018 and API 5L X-65 carbon steels, while the addition of H2S concentrations of 15ppm and greater tended to retard corrosion. The same effect was not found in single-phase flow. A vapor-liquid equilibrium model for dilute aqueous solutions of H2S/CO2 was developed to provide a tool for estimating water chemistry of a closed system such as a flow loop or an autoclave.

Subject
Scanning electron microscopy, Hydrogen sulfide, Water, Materials, Hydrogen concentration, Flow loop, Corrosion rate, Steel coupons, Flow velocity, Partial pressures, Constants, Multiphase flow, Linear polarization resistance
Keywords:
hydrogen sulfide, carbon dioxide, acid gas, vapor-liquid equilibrium model
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2003
Association for Materials Protection and Performance (AMPP)
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