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EFFECT OF LOW CONCENTRATION ACETIC ACID ON CO2 CORROSION IN TURBULENT FLOW CONDITIONS

CO2 corrosion is the main cause of failure in the upstream sector of the oil and gas industry. Interactions between some corrosive species, such as acetic acid (HAc), and operating conditions such as flow, could influence the CO2 corrosion mechanism and kinetics. The objective of this research was...

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Main Authors: Che Ismail, Mokhtar, Fatah, Martin Choirul
Format: Citation Index Journal
Published: King Fahd Univeristy of Petroleum and Minerals 2009
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utp.edu.my/1763/1/AJSE.pdf
http://eprints.utp.edu.my/1763/
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spelling my.utp.eprints.17632017-03-20T02:00:01Z EFFECT OF LOW CONCENTRATION ACETIC ACID ON CO2 CORROSION IN TURBULENT FLOW CONDITIONS Che Ismail, Mokhtar Fatah, Martin Choirul TJ Mechanical engineering and machinery CO2 corrosion is the main cause of failure in the upstream sector of the oil and gas industry. Interactions between some corrosive species, such as acetic acid (HAc), and operating conditions such as flow, could influence the CO2 corrosion mechanism and kinetics. The objective of this research was to study the mechanism and kinetics of CO2 corrosion in the presence of a low concentration of acetic acid in turbulent flow conditions at fixed pH and various temperatures. The electrochemical studies were based on linear polarization resistance (LPR) and potentiodynamic polarization. A Rotating Cylinder Electrode (RCE) apparatus was used to simulate turbulent conditions by correlating shear stress to represent pipe-flow condition. Based on the LPR results, CO2 corrosion rate was not significantly influenced by the presence of HAc below 40 ppm. An appreciable increase in corrosion rate up to 68% was only observed for HAc concentration of more than 40 ppm. HAc increases corrosion rate by increasing cathodic reaction through the direct reduction and dissociation reactions. It was also observed that corrosion rate increases with increasing temperature. This is due to the acceleration of anodic and cathodic reactions when temperature increases and the availability of more HAc species at higher temperature. Furthermore, an increase in the corrosion rate due to an increase in the rotational velocity was recorded in this study until 2000 rpm. Beyond this, not much effect of rotational velocity was observed. Flow effect is related to the transport of species towards and away from metal surfaces. Potentiodynamic polarization sweeps showed that the cathodic reaction slightly increases with the presence of a low concentration of HAc. There was no change in the mechanism of anodic reaction. King Fahd Univeristy of Petroleum and Minerals 2009-12 Citation Index Journal PeerReviewed application/pdf http://eprints.utp.edu.my/1763/1/AJSE.pdf Che Ismail, Mokhtar and Fatah, Martin Choirul (2009) EFFECT OF LOW CONCENTRATION ACETIC ACID ON CO2 CORROSION IN TURBULENT FLOW CONDITIONS. [Citation Index Journal] http://eprints.utp.edu.my/1763/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Che Ismail, Mokhtar
Fatah, Martin Choirul
EFFECT OF LOW CONCENTRATION ACETIC ACID ON CO2 CORROSION IN TURBULENT FLOW CONDITIONS
description CO2 corrosion is the main cause of failure in the upstream sector of the oil and gas industry. Interactions between some corrosive species, such as acetic acid (HAc), and operating conditions such as flow, could influence the CO2 corrosion mechanism and kinetics. The objective of this research was to study the mechanism and kinetics of CO2 corrosion in the presence of a low concentration of acetic acid in turbulent flow conditions at fixed pH and various temperatures. The electrochemical studies were based on linear polarization resistance (LPR) and potentiodynamic polarization. A Rotating Cylinder Electrode (RCE) apparatus was used to simulate turbulent conditions by correlating shear stress to represent pipe-flow condition. Based on the LPR results, CO2 corrosion rate was not significantly influenced by the presence of HAc below 40 ppm. An appreciable increase in corrosion rate up to 68% was only observed for HAc concentration of more than 40 ppm. HAc increases corrosion rate by increasing cathodic reaction through the direct reduction and dissociation reactions. It was also observed that corrosion rate increases with increasing temperature. This is due to the acceleration of anodic and cathodic reactions when temperature increases and the availability of more HAc species at higher temperature. Furthermore, an increase in the corrosion rate due to an increase in the rotational velocity was recorded in this study until 2000 rpm. Beyond this, not much effect of rotational velocity was observed. Flow effect is related to the transport of species towards and away from metal surfaces. Potentiodynamic polarization sweeps showed that the cathodic reaction slightly increases with the presence of a low concentration of HAc. There was no change in the mechanism of anodic reaction.
format Citation Index Journal
author Che Ismail, Mokhtar
Fatah, Martin Choirul
author_facet Che Ismail, Mokhtar
Fatah, Martin Choirul
author_sort Che Ismail, Mokhtar
title EFFECT OF LOW CONCENTRATION ACETIC ACID ON CO2 CORROSION IN TURBULENT FLOW CONDITIONS
title_short EFFECT OF LOW CONCENTRATION ACETIC ACID ON CO2 CORROSION IN TURBULENT FLOW CONDITIONS
title_full EFFECT OF LOW CONCENTRATION ACETIC ACID ON CO2 CORROSION IN TURBULENT FLOW CONDITIONS
title_fullStr EFFECT OF LOW CONCENTRATION ACETIC ACID ON CO2 CORROSION IN TURBULENT FLOW CONDITIONS
title_full_unstemmed EFFECT OF LOW CONCENTRATION ACETIC ACID ON CO2 CORROSION IN TURBULENT FLOW CONDITIONS
title_sort effect of low concentration acetic acid on co2 corrosion in turbulent flow conditions
publisher King Fahd Univeristy of Petroleum and Minerals
publishDate 2009
url http://eprints.utp.edu.my/1763/1/AJSE.pdf
http://eprints.utp.edu.my/1763/
_version_ 1738655151478013952
score 13.211869

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