Menu
Search
Filters
Close
Menu

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
Available for download
Product Number: 51321-16676-SG
Author: A. Cutright; B. Brown; S. Nesic; M. Singer; D. Young
Publication Date: 2021
$0.00
$20.00
$20.00

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.

Product tags
Also Purchased
Picture for Localized Corrosion of Mild Steel under Iron Sulfide Layers in CO2/H2S Environment
Available for download

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

Product Number: 51318-10990-SG
Author: Saba Navabzadeh Esmaeely / Gheorghe Bota / Bruce Brown / Srdjan Nesic
Publication Date: 2018
$20.00

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.

 
Picture for Comparison of corrosion behavior of X65 pipeline steel in CO2-H2S and CO2 environment at different f
Available for download

51312-01238-Comparison of corrosion behavior of X65 pipeline steel in CO2-H2S and CO2 environment at different f

Product Number: 51312-01238-SG
ISBN: 01238 2012 CP
Author: Wei Liu
Publication Date: 2012
$20.00
Picture for Interaction of H2S/CO2/O2 on Hydrogen Permeation of X70 Steel in Sour Humidity Corrosion Environment
Available for download

51316-7362-Interaction of H2S/CO2/O2 on Hydrogen Permeation of X70 Steel in Sour Humidity Corrosion Environment

Product Number: 51316-7362-SG
ISBN: 7362 2016 CP
Author: Wei Liu
Publication Date: 2016
$20.00

Corrosion performance of 3%Cr steel in CO2 and CO2-H2S environments was investigated using high temperature and high pressure autoclave. Corrosion scales were characterized by x-ray powder diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support