Three different mild steel coupons with two different surface areas were exposed to a CO2 saturated multiphase environment with a trace amount of hydrogen sulfide under supersaturated scale forming conditions designed to increase the probability of localized corrosion. Corrosion testing was conducted in the region of low supersaturation values for iron carbonate (SSFeCO3 < 10) and three different supersaturation values for iron sulfide (2.5 < SSFeS < 125) through adjustment of the partial pressure of H2S during 30 day exposures to system conditions. Experiments were conducted in a 1% NaCl solution at 60°C, pH 6.0, 0.77MPa partial pressure CO2 with trace amounts of H2S in both single phase flow (Vsl = 1 m/s) and multiphase flow (Vsg=3 m/s, Vsl= 1 m/s). Under the conditions tested, both siderite and mackinawite films were developed as adherent corrosion product films. Localized corrosion was observed.

Subject
Films, Hydrogen concentration, Corrosion rate, Iron carbonate, Iron sulfides, Iron carbonate films, Weight loss coupons, Supersaturation, Multiphase flow, Film formation, Corrosion coupons, Localized corrosion, Linear polarization resistance
Keywords:
hydrogen sulfide, carbon dioxide, acid gas, multiphase flow, single-phase flow, supersaturation, localized corrosion, iron sulfide, iron carbonate
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2005
Association for Materials Protection and Performance (AMPP)
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