Onyeji, L and Kale, GM orcid.org/0000-0002-3021-5905 (2019) Electrochemical Response of Proprietary Microalloyed Steels to pH and Temperature Variations in Brine Containing 0.5% CO2. Corrosion, 75 (9). pp. 1074-1086. ISSN 0010-9312
Abstract
The corrosion behavior of three new-generation microalloyed steels in CO2 saturated brine at different pHs and temperatures was investigated using electrochemical measurements such as linear polarization resistance (LPR), Tafel polarization, and electrochemical impedance spectroscopy (EIS), and surface analyses techniques such as scanning electron microscopy coupled with energy dispersive x-ray spectroscopy (SEM/EDS) and x-ray diffraction (XRD) analysis. The microalloyed steels with ferrite-pearlite microstructures demonstrated better corrosion resistance than the specimen with bainitic structures. The analysis of the corroded surface revealed relative elemental changes of corrosion products revealing that the average ratio of Fe/O increased with an increase in pH but decreased with an increase in temperature. The electrochemical results indicated that the corrosion resistance of Steel C < Steel B < Steel A. The corrosion kinetics of the steels follow the empirical relation y = AxB, thus obeying the well-known Log-Log equation (Log Y = Log A + B log X) which can be used to predict long-time corrosion performance. The value of B represents the corrosion kinetics and it decreased with an increase in pH depicting corrosion deceleration but increased with temperature signifying corrosion acceleration.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 NACE International. This is an author produced version of a paper published in Corrosion. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | brine, corrosion, microstructure, microalloyed steel, pH, temperature |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Nov 2019 12:28 |
Last Modified: | 05 Nov 2019 12:28 |
Status: | Published |
Publisher: | NACE International |
Identification Number: | 10.5006/2930 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:153064 |