Experiments were conducted to determine the effect of an incremental change in the solution pH, from 4 to 6.6, on CO2 corrosion rates of AISI 1018 steel in the presence of H2S in both single phase flow (Vsl = 1 m/s) and multiphase flow (Vsg=3 m/s, Vsl= 1 m/s) in a large scale multiphase flow loop. Linear polarization probes, electrical resistance probes, and weight loss coupons were used to monitor corrosion rates during 4 to 10 day exposures to a CO2 saturated solution with trace amounts of H2S. The media for experimentation was a 1% NaCl solution at 60°C, at 7.9 bar (100 psig) total pressure, with gas phase additions of H2S up to 100 ppm. Protective adherent films, seen under these conditions, limited corrosion rates in both single phase and multiphase flow conditions.

Subject
Energy dispersive X-ray spectroscopy, Hydrogen concentration, Corrosion rate, Metal surfaces, Iron sulfides, Protective films, Saturation, Sodium chloride, Weight loss coupons, Multiphase flow, Sodium chloride solution, Film formation, Linear polarization resistance
Keywords:
hydrogen sulfide, carbon dioxide, acid gas, multiphase flow, single-phase flow, saturation
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2004
Association for Materials Protection and Performance (AMPP)
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