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Onset Of Corrosion Rate Retardation At Very Low Concentrations Of H2S In A CO2 Environment

Picture for Onset Of Corrosion Rate Retardation At Very Low Concentrations Of H2S In A CO2 Environment
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Product Number: 51321-16676-SG
Author: A. Cutright; B. Brown; S. Nesic; M. Singer; D. Young
Publication Date: 2021
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Many experimental studies have indicated that the addition of H2S on the order of 10-1
mbar to a CO2 saturated environment can dramatically decrease the corrosion rate at
various temperatures. This is likely due to the formation of a very thin layer of iron sulfide
(FeS). In this research, the trend in corrosion rate of X65 steel at various H2S
concentrations below 100 ppm (0.1 mbar) in CO2 at 1 bar total pressure and at various
temperatures was studied. Corrosion rate was measured in situ using linear polarization
resistance (LPR) and electrochemical impedance spectroscopy (EIS). It was observed
that at 30°C, 0.5 ppm H2S (0.0005 mbar pH2S) had no effect on the corrosion rate
compared to that seen in pure CO2 conditions, whereas 5 ppm H2S (0.005 mbar pH2S)
was able to significantly decrease the corrosion rate. At 80°C, a noticeable decrease was
seen at 100 ppm, which was the highest concentration tested. The lack of a decrease in
corrosion rate at 0.5 ppm at 30°C is likely due to the low concentration of H2S molecules
available leading to a slowing in the formation of the protective FeS layer. At 80°C, the
corrosion rate is significantly higher leading to the necessity of increased H2S
concentrations to form the FeS layer fast enough to see a decrease in the corrosion rate.

Many experimental studies have indicated that the addition of H2S on the order of 10-1
mbar to a CO2 saturated environment can dramatically decrease the corrosion rate at
various temperatures. This is likely due to the formation of a very thin layer of iron sulfide
(FeS). In this research, the trend in corrosion rate of X65 steel at various H2S
concentrations below 100 ppm (0.1 mbar) in CO2 at 1 bar total pressure and at various
temperatures was studied. Corrosion rate was measured in situ using linear polarization
resistance (LPR) and electrochemical impedance spectroscopy (EIS). It was observed
that at 30°C, 0.5 ppm H2S (0.0005 mbar pH2S) had no effect on the corrosion rate
compared to that seen in pure CO2 conditions, whereas 5 ppm H2S (0.005 mbar pH2S)
was able to significantly decrease the corrosion rate. At 80°C, a noticeable decrease was
seen at 100 ppm, which was the highest concentration tested. The lack of a decrease in
corrosion rate at 0.5 ppm at 30°C is likely due to the low concentration of H2S molecules
available leading to a slowing in the formation of the protective FeS layer. At 80°C, the
corrosion rate is significantly higher leading to the necessity of increased H2S
concentrations to form the FeS layer fast enough to see a decrease in the corrosion rate.

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51318-10990-Localized Corrosion of Mild Steel under Iron Sulfide Layers in CO2/H2S Environment

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Mild steel specimens (API 5L X65) were pretreated to form a pyrrhotite layer on the surface using high temperature sulfidation in oil, then exposed to a range of aqueous CO2 and H2S corrosion environments, leading to initiation of localized corrosion.

 
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