The Effect of Organic Inhibitors on the Corrosion of Mild Steel in Varying Crude Oil–Brine Emulsions: The Electrochemical Protocol Selection
4 affiliations
- 1D.V. Sokolsky Institute of Fuel, Catalysis and Electrochemistry JSC, 142 Kunayev Str., Almaty 050010, Kazakhstan
- 2Al-Farabi Kazakh National University, 71, Al-Farabi Avenue, Almaty 050012, Kazakhstan
- 3Kazakh British Technical University, Tole bi Street, 59, Almaty 050000, Kazakhstan
- 4Renewable Energy Lab, “National laboratory Astana”, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana 010000, Kazakhstan
Abstract
Corrosion inhibitors are widely used in oil production, transportation, and refining, where crude oil–brine emulsions complicate electrochemical testing because of their heterogeneity and low conductivity. This study examined the use of Tafel polarization and electrochemical impedance spectroscopy to assess mild steel corrosion in brine and crude oil–brine emulsions in the presence of Nalco EC 1010B and Scimol OR 2001. Emulsions with a continuous conductive phase were tested directly, whereas the brine phase of reverse emulsions was separated before measurement. In brine, both inhibitors provided more than 80% protection at a concentration of 20 mg/L. At this concentration, corrosion rates in the inhibited direct emulsion and the brine phase separated from the reverse emulsion were approximately 0.20–0.25 mm/year, comparable to those in inhibited brine under similar conditions. In stable emulsions, the surfactant also affected steel corrosion, complicating the assessment of inhibitor performance. These results indicate that measurements in brine can guide the selection of inhibitor concentrations for direct and reverse emulsions under the conditions investigated.
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BibTeX
@article{ivanova2026effect,
title = {{The Effect of Organic Inhibitors on the Corrosion of Mild Steel in Varying Crude Oil–Brine Emulsions: The Electrochemical Protocol Selection}},
author = {Nataliya A. Ivanova and Adina Alibayeva and Xeniya Leontyeva and Nurislam Shaiakhmetov and Batyr Boribaiuly and Guzal Ismailova and Ruslan Nurislamov and Gulinur Khussurova and Vladislav Kudryashov},
journal = {Molecules},
year = {2026},
month = oct,
doi = {10.3390/molecules31203743},
url = {https://www.mdpi.com/1420-3049/31/20/3743},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - The Effect of Organic Inhibitors on the Corrosion of Mild Steel in Varying Crude Oil–Brine Emulsions: The Electrochemical Protocol Selection
AU - Nataliya A. Ivanova
AU - Adina Alibayeva
AU - Xeniya Leontyeva
AU - Nurislam Shaiakhmetov
AU - Batyr Boribaiuly
AU - Guzal Ismailova
AU - Ruslan Nurislamov
AU - Gulinur Khussurova
AU - Vladislav Kudryashov
PY - 2026
DA - 2026/10/01
JO - Molecules
DO - 10.3390/molecules31203743
UR - https://www.mdpi.com/1420-3049/31/20/3743
AB - Corrosion inhibitors are widely used in oil production, transportation, and refining, where crude oil–brine emulsions complicate electrochemical testing because of their heterogeneity and low conductivity. This study examined the use of Tafel polarization and electrochemical impedance spectroscopy to assess mild steel corrosion in brine and crude oil–brine emulsions in the presence of Nalco EC 1010B and Scimol OR 2001. Emulsions with a continuous conductive phase were tested directly, whereas the brine phase of reverse emulsions was separated before measurement. In brine, both inhibitors provided more than 80% protection at a concentration of 20 mg/L. At this concentration, corrosion rates in the inhibited direct emulsion and the brine phase separated from the reverse emulsion were approximately 0.20–0.25 mm/year, comparable to those in inhibited brine under similar conditions. In stable emulsions, the surfactant also affected steel corrosion, complicating the assessment of inhibitor performance. These results indicate that measurements in brine can guide the selection of inhibitor concentrations for direct and reverse emulsions under the conditions investigated.
SN - 1420-3049
ER -