The objective of this work was to determine the corrosion rate of mild steel and characterize the corrosion products in sour environments at temperatures ranging from 80°C to 200°C. First, a H2S–H2O water chemistry model was developed based on available literature for a closed system at high temperature. Then, H2S corrosion tests were conducted at 80°C, 120°C, 160°C, and 200°C with an exposure time of 4 d. Linear polarization resistance (LPR) and weight loss (WL) methods were used to measure the corrosion rates. X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive x-ray spectroscopy microanalysis (SEM/EDS) were used to characterize the corrosion products and surface morphology. The results show that the initial corrosion rates increased with temperature then decreased as they achieved steady state. The corrosion product was comprised of two distinct layers. The inner corrosion product was always an iron oxide layer (hypothesized to be Fe3O4), while mackinawite, troilite, pyrrhotite, and pyrite were identified as the main components of the outer layer at 80°C, 120°C, 160°C and 200°C, respectively. Pourbaix diagrams generated based on the analysis of water chemistry corroborated the experimental characterization of the corrosion products.
Skip Nav Destination
Article navigation
1 August 2017
Research Article|
June 08 2017
Corrosion Behavior of Mild Steel in Sour Environments at Elevated Temperatures Available to Purchase
Shujun Gao;
Shujun Gao
‡
*Institute for Corrosion and Multiphase Technology, Department of Chemical & Biomolecular Engineering, Ohio University, 342 West State Street, Athens, OH 45701.
‡Corresponding author. E-mail: [email protected].
Search for other works by this author on:
Peng Jin;
Peng Jin
*Institute for Corrosion and Multiphase Technology, Department of Chemical & Biomolecular Engineering, Ohio University, 342 West State Street, Athens, OH 45701.
Search for other works by this author on:
Bruce Brown;
Bruce Brown
*Institute for Corrosion and Multiphase Technology, Department of Chemical & Biomolecular Engineering, Ohio University, 342 West State Street, Athens, OH 45701.
Search for other works by this author on:
David Young;
David Young
*Institute for Corrosion and Multiphase Technology, Department of Chemical & Biomolecular Engineering, Ohio University, 342 West State Street, Athens, OH 45701.
Search for other works by this author on:
Srdjan Nesic;
Srdjan Nesic
*Institute for Corrosion and Multiphase Technology, Department of Chemical & Biomolecular Engineering, Ohio University, 342 West State Street, Athens, OH 45701.
Search for other works by this author on:
Marc Singer
Marc Singer
*Institute for Corrosion and Multiphase Technology, Department of Chemical & Biomolecular Engineering, Ohio University, 342 West State Street, Athens, OH 45701.
Search for other works by this author on:
‡Corresponding author. E-mail: [email protected].
Received:
December 20 2016
Revision Received:
March 22 2017
Accepted:
March 22 2017
Online ISSN: 1938-159X
Print ISSN: 0010-9312
© 2017, NACE International
2017
CORROSION (2017) 73 (8): 915–926.
Article history
Received:
December 20 2016
Revision Received:
March 22 2017
Accepted:
March 22 2017
Citation
Shujun Gao, Peng Jin, Bruce Brown, David Young, Srdjan Nesic, Marc Singer; Corrosion Behavior of Mild Steel in Sour Environments at Elevated Temperatures. CORROSION 1 August 2017; 73 (8): 915–926. https://doi.org/10.5006/2366
Download citation file:
Citing articles via
Suggested Reading
Effect of High Temperature on the Aqueous H2S Corrosion of Mild Steel
CORROSION (June,2017)
Fe3O4, FeCO3 or FeS - Which Corrosion Product Will Prevail at High Temperature in CO2/H2S Environments?
CONF_MAR2020