H2S Multiphase Flow Loop: CO2 Corrosion in the Presence of Trace Amounts of Hydrogen Sulfide

 
 
 
 

H2S Multiphase Flow Loop: CO2 Corrosion in the Presence of Trace Amounts of Hydrogen Sulfide

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Title: H2S Multiphase Flow Loop: CO2 Corrosion in the Presence of Trace Amounts of Hydrogen Sulfide
Author: Brown, Bruce N.
Description: An experimental series was conducted to measure the effect of low concentrations of H2 S (3, 15, 100 ppm) under “non-film forming conditions” for iron carbonate at pH 4 in a CO2 saturated environment on the corrosion rates of UNS C1018 and X65 carbon steels at two temperatures (60°C and 80°C). These experiments in the Hydrogen Sulfide Multiphase Flow Loop provide the first example of the effect of H2S concentration on corrosion rates measured concurrently in single phase and multiphase flow in a CO2 saturated environment. At 60°C and 80°C, any addition of H2S retarded the corrosion rate in both single phase and multiphase flow conditions over a 96-hour exposure period as compared to the corrosion rate measured under the same partial pressure of CO2 without the presence of H2S. At pH 4, films of 5 to 10μm were produced over 96 hours for UNS C1018 flush-mounted coupons in a system with a 100ppm concentration of H2S in the gas phase. Electron dispersion spectroscopy of the films provides proof of an iron sulfide (FeS) film. Thinner films were developed under conditions of 3ppm and 15ppm H2S concentrations, but film thickness was not as easily quantified by scanning electron microscopy. Overall, higher corrosion rates consistently occurred in multiphase flow when compared to those measured under single phase conditions. Pitting corrosion was observed at 80°C for both 3ppm and 15ppm H2S concentrations. System validation tests on the Hydrogen Sulfide Flow Loop system prior to this experimentation show repeatability and good comparison to another flow system under the same operating conditions without the presence of H2S.
Permanent Link: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1107788784
http://hdl.handle.net/2374.OX/13368
Date: 2004

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