Corrosion of Low-Alloy Steel in Ethanolamine Steam Generator Chemistry—The Effect of Temperature and Flow Rate
The corrosion of low-alloy steel in ethanolamine solution, simulating steam generator chemistry, is studied by in situ chronopotentiometry and electrochemical impedance spectroscopy combined with ex situ analysis of the obtained oxide films and model calculations. Hydrodynamic calculations of the pr...
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MDPI AG
2025-01-01
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| Online Access: | https://www.mdpi.com/1420-3049/30/2/418 |
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| author | Iva Betova Martin Bojinov Vasil Karastoyanov |
| author_facet | Iva Betova Martin Bojinov Vasil Karastoyanov |
| author_sort | Iva Betova |
| collection | DOAJ |
| description | The corrosion of low-alloy steel in ethanolamine solution, simulating steam generator chemistry, is studied by in situ chronopotentiometry and electrochemical impedance spectroscopy combined with ex situ analysis of the obtained oxide films and model calculations. Hydrodynamic calculations of the proposed setup to study flow-assisted corrosion demonstrate that turbulent conditions are achieved. Quantum chemical calculations indicate the adsorption orientation of ethanolamine on the oxide surface. Interpretation of impedance spectra with a kinetic approach based on the mixed-conduction model enabled estimating the rate constants of oxidation at the alloy–oxide interface, as well as charge transfer and ionic transport resistances of the corrosion process. In turbulent conditions, the dissolution of Fe oxide and ejection of Fe cations are enhanced, leading to Cr enrichment in the oxide and alteration of its electronic and electrochemical properties that influence the corrosion rate. |
| format | Article |
| id | doaj-art-123223aa66d9438e83b2b9081fd42904 |
| institution | Kabale University |
| issn | 1420-3049 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj-art-123223aa66d9438e83b2b9081fd429042025-01-24T13:43:58ZengMDPI AGMolecules1420-30492025-01-0130241810.3390/molecules30020418Corrosion of Low-Alloy Steel in Ethanolamine Steam Generator Chemistry—The Effect of Temperature and Flow RateIva Betova0Martin Bojinov1Vasil Karastoyanov2Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, 1113 Sofia, BulgariaDepartment of Physical Chemistry, University of Chemical Technology and Metallurgy, 8 Kliment Ohridski Blvd., 1756 Sofia, BulgariaDepartment of Physical Chemistry, University of Chemical Technology and Metallurgy, 8 Kliment Ohridski Blvd., 1756 Sofia, BulgariaThe corrosion of low-alloy steel in ethanolamine solution, simulating steam generator chemistry, is studied by in situ chronopotentiometry and electrochemical impedance spectroscopy combined with ex situ analysis of the obtained oxide films and model calculations. Hydrodynamic calculations of the proposed setup to study flow-assisted corrosion demonstrate that turbulent conditions are achieved. Quantum chemical calculations indicate the adsorption orientation of ethanolamine on the oxide surface. Interpretation of impedance spectra with a kinetic approach based on the mixed-conduction model enabled estimating the rate constants of oxidation at the alloy–oxide interface, as well as charge transfer and ionic transport resistances of the corrosion process. In turbulent conditions, the dissolution of Fe oxide and ejection of Fe cations are enhanced, leading to Cr enrichment in the oxide and alteration of its electronic and electrochemical properties that influence the corrosion rate.https://www.mdpi.com/1420-3049/30/2/418ethanolaminelow-alloy steelflow-assisted corrosionelectrochemical impedance spectroscopyhydrodynamic calculationskinetic model |
| spellingShingle | Iva Betova Martin Bojinov Vasil Karastoyanov Corrosion of Low-Alloy Steel in Ethanolamine Steam Generator Chemistry—The Effect of Temperature and Flow Rate Molecules ethanolamine low-alloy steel flow-assisted corrosion electrochemical impedance spectroscopy hydrodynamic calculations kinetic model |
| title | Corrosion of Low-Alloy Steel in Ethanolamine Steam Generator Chemistry—The Effect of Temperature and Flow Rate |
| title_full | Corrosion of Low-Alloy Steel in Ethanolamine Steam Generator Chemistry—The Effect of Temperature and Flow Rate |
| title_fullStr | Corrosion of Low-Alloy Steel in Ethanolamine Steam Generator Chemistry—The Effect of Temperature and Flow Rate |
| title_full_unstemmed | Corrosion of Low-Alloy Steel in Ethanolamine Steam Generator Chemistry—The Effect of Temperature and Flow Rate |
| title_short | Corrosion of Low-Alloy Steel in Ethanolamine Steam Generator Chemistry—The Effect of Temperature and Flow Rate |
| title_sort | corrosion of low alloy steel in ethanolamine steam generator chemistry the effect of temperature and flow rate |
| topic | ethanolamine low-alloy steel flow-assisted corrosion electrochemical impedance spectroscopy hydrodynamic calculations kinetic model |
| url | https://www.mdpi.com/1420-3049/30/2/418 |
| work_keys_str_mv | AT ivabetova corrosionoflowalloysteelinethanolaminesteamgeneratorchemistrytheeffectoftemperatureandflowrate AT martinbojinov corrosionoflowalloysteelinethanolaminesteamgeneratorchemistrytheeffectoftemperatureandflowrate AT vasilkarastoyanov corrosionoflowalloysteelinethanolaminesteamgeneratorchemistrytheeffectoftemperatureandflowrate |