Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

A Mechanistic Study On The Effect Of Salt Concentration On Uniform Corrosion Rate Of Pipeline Steel In Acidic Aqueous Environments

Picture for A Mechanistic Study On The Effect Of Salt Concentration On Uniform Corrosion Rate Of Pipeline Steel In Acidic Aqueous Environments
Available for download
Product Number: 51321-16788-SG
Author: Fazlollah Madani Sani; Bruce Brown; Srdjan Nesic
Publication Date: 2021
$0.00
$20.00
$20.00

CO2/H2S corrosion in oil and gas fields is often associated with acidity and salinity of fluids. However, the role of salinity is usually ignored in corrosion studies and corrosion prediction models. As part of a major project to model uniform CO2/H2S corrosion of carbon steel oil and gas pipelines in high salinity environments, the research reported herein investigated uniform CO2 corrosion in high salinity acidic media. Experiments were carried out using a rotating disk electrode (RDE) in CO2-saturated aqueous solutions at 10oC and a constant pH of 3.0, whilst varying NaCl concentration from 1 wt.% to 20 wt.%. The RDE setup was used because mass transfer of species to the surface in this setup is well understood. A low temperature was chosen to better distinguish between charge transfer and mass transfer-controlled reactions underlying the corrosion process. Surface analysis indicated that the corrosion process was uniform, and no corrosion layer formed on the steel surface. Both linear polarization resistance (LPR) and potentiodynamic polarization (PD) techniques showed a general decrease in the uniform corrosion rate with increasing salt concentration. The analysis of the PD sweeps showed that salt concentration did not influence the mechanism of anodic and cathodic reactions and the decrease in the corrosion rate was due to deceleration in the rate of both anodic and cathodic reactions. Modeling results showed that salt concentration mostly affected the rate of mass transfer of H+ ion to the surface by changing H+ diffusion coefficient and H+ activity coefficient.

CO2/H2S corrosion in oil and gas fields is often associated with acidity and salinity of fluids. However, the role of salinity is usually ignored in corrosion studies and corrosion prediction models. As part of a major project to model uniform CO2/H2S corrosion of carbon steel oil and gas pipelines in high salinity environments, the research reported herein investigated uniform CO2 corrosion in high salinity acidic media. Experiments were carried out using a rotating disk electrode (RDE) in CO2-saturated aqueous solutions at 10oC and a constant pH of 3.0, whilst varying NaCl concentration from 1 wt.% to 20 wt.%. The RDE setup was used because mass transfer of species to the surface in this setup is well understood. A low temperature was chosen to better distinguish between charge transfer and mass transfer-controlled reactions underlying the corrosion process. Surface analysis indicated that the corrosion process was uniform, and no corrosion layer formed on the steel surface. Both linear polarization resistance (LPR) and potentiodynamic polarization (PD) techniques showed a general decrease in the uniform corrosion rate with increasing salt concentration. The analysis of the PD sweeps showed that salt concentration did not influence the mechanism of anodic and cathodic reactions and the decrease in the corrosion rate was due to deceleration in the rate of both anodic and cathodic reactions. Modeling results showed that salt concentration mostly affected the rate of mass transfer of H+ ion to the surface by changing H+ diffusion coefficient and H+ activity coefficient.

Product tags
Also Purchased
Picture for 00044 EIS STUDY OF CORROSION PRODUCT FILM
Available for download

00044 EIS STUDY OF CORROSION PRODUCT FILM IN PIPELINES

Product Number: 51300-00044-SG
ISBN: 00044 2000 CP
Author: T. Hong, H Shi, H. Wang, M. Gopal and W. P. Jepson
$20.00
Picture for SP0716-2016
Available for download

NACE SP0716-2016, Soluble Salt Testing Frequency and Locations on Previously Coated Surfaces

Product Number: 21409-SG
Publication Date: 2016
$179.00

HISTORICAL DOCUMENT. Test for the presence of surface soluble salts before application of a coating system.  Previously coated or eplacement  substrates  only. Does not include allowable limits of soluble salts.
Picture for RP0402-2002
Available for download

RP0402-2002, Field-Applied Fusion-Bonded Epoxy (FBE) Pipe Coating Systems for Girth Weld Joints: Application, Performance, and Quality Control

Product Number: 21096-SG
Publication Date: 2002
$179.00

HISTORICAL DOCUMENT. Field-applied fusion-bonded epoxy (FBE) external pipe coating systems for girth weld joints.  Applicable to underground steel pipelines in the oil and gas gathering, distribution, and transmission industries.
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