Investigation of the Electrochemical Mechanisms for Acetic Acid Corrosion of Mild Steel
International audience Acetic acid (CH3COOH) is recognized as an important factor in mild steel corrosion. Similar to carbonic acid (H2CO3) present in carbon dioxide (CO2)-saturated aqueous environments, acetic acid is a weak acid, which partially dissociates with the equilibrium being a function of...
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ftunivnantes:oai:HAL:hal-01016538v1 2023-05-15T15:52:35+02:00 Investigation of the Electrochemical Mechanisms for Acetic Acid Corrosion of Mild Steel Tran, Thu Brown, Bruce Nesic, Srdjan Tribollet, Bernard Institute for Corrosion and Multiphase Technology Ohio University Laboratoire Interfaces et Systèmes Electrochimiques (LISE) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) 2014 https://hal.sorbonne-universite.fr/hal-01016538 https://doi.org/10.5006/0933 en eng HAL CCSD National Association of Corrosion Engineers info:eu-repo/semantics/altIdentifier/doi/10.5006/0933 hal-01016538 https://hal.sorbonne-universite.fr/hal-01016538 doi:10.5006/0933 ISSN: 0010-9312 Corrosion https://hal.sorbonne-universite.fr/hal-01016538 Corrosion, National Association of Corrosion Engineers, 2014, 70 (3), pp.223-229. ⟨10.5006/0933⟩ acetic acid cathodic reaction mild steel corrosion [CHIM.OTHE]Chemical Sciences/Other info:eu-repo/semantics/article Journal articles 2014 ftunivnantes https://doi.org/10.5006/0933 2022-11-16T02:15:49Z International audience Acetic acid (CH3COOH) is recognized as an important factor in mild steel corrosion. Similar to carbonic acid (H2CO3) present in carbon dioxide (CO2)-saturated aqueous environments, acetic acid is a weak acid, which partially dissociates with the equilibrium being a function of pH and the solution temperature. Stronger than carbonic acid (pKa 4.76 vs. 6.35 at 25°C), acetic acid is the main source of hydrogen ions when the concentration of each acid is the same. Based on many different studies, it is agreed that acetic acid enhances the corrosion rate of mild steel by accelerating the rate of the cathodic (reduction) reaction. However, the electrochemical mechanism of acetic acid reduction at the metal surface is still being debated. One possibility is for the undissociated acetic acid to provide additional hydrogen ions by dissociation near the metal surface. In that case the main cathodic reduction is hydrogen ion reduction, and this mechanism is commonly referred to as a "buffering effect." If, in addition to this pathway for hydrogen evolution, there is a reduction of the adsorbed undissociated acetic acid at the metal surface, the mechanism is known as "direct reduction." In the present study, electrochemical techniques were used to investigate the effect of acetic acid on the cathodic reaction mechanism. It was found that the presence of acetic acid affects only the overall cathodic limiting current, but had no significant effect on the cathodic charge-transfer current. The latter was found to respond only to a change of pH. It was therefore concluded that the buffering effect mechanism is correct. Article in Journal/Newspaper Carbonic acid Université de Nantes: HAL-UNIV-NANTES Corrosion 70 3 223 229 |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
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English |
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acetic acid cathodic reaction mild steel corrosion [CHIM.OTHE]Chemical Sciences/Other |
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acetic acid cathodic reaction mild steel corrosion [CHIM.OTHE]Chemical Sciences/Other Tran, Thu Brown, Bruce Nesic, Srdjan Tribollet, Bernard Investigation of the Electrochemical Mechanisms for Acetic Acid Corrosion of Mild Steel |
topic_facet |
acetic acid cathodic reaction mild steel corrosion [CHIM.OTHE]Chemical Sciences/Other |
description |
International audience Acetic acid (CH3COOH) is recognized as an important factor in mild steel corrosion. Similar to carbonic acid (H2CO3) present in carbon dioxide (CO2)-saturated aqueous environments, acetic acid is a weak acid, which partially dissociates with the equilibrium being a function of pH and the solution temperature. Stronger than carbonic acid (pKa 4.76 vs. 6.35 at 25°C), acetic acid is the main source of hydrogen ions when the concentration of each acid is the same. Based on many different studies, it is agreed that acetic acid enhances the corrosion rate of mild steel by accelerating the rate of the cathodic (reduction) reaction. However, the electrochemical mechanism of acetic acid reduction at the metal surface is still being debated. One possibility is for the undissociated acetic acid to provide additional hydrogen ions by dissociation near the metal surface. In that case the main cathodic reduction is hydrogen ion reduction, and this mechanism is commonly referred to as a "buffering effect." If, in addition to this pathway for hydrogen evolution, there is a reduction of the adsorbed undissociated acetic acid at the metal surface, the mechanism is known as "direct reduction." In the present study, electrochemical techniques were used to investigate the effect of acetic acid on the cathodic reaction mechanism. It was found that the presence of acetic acid affects only the overall cathodic limiting current, but had no significant effect on the cathodic charge-transfer current. The latter was found to respond only to a change of pH. It was therefore concluded that the buffering effect mechanism is correct. |
author2 |
Institute for Corrosion and Multiphase Technology Ohio University Laboratoire Interfaces et Systèmes Electrochimiques (LISE) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Tran, Thu Brown, Bruce Nesic, Srdjan Tribollet, Bernard |
author_facet |
Tran, Thu Brown, Bruce Nesic, Srdjan Tribollet, Bernard |
author_sort |
Tran, Thu |
title |
Investigation of the Electrochemical Mechanisms for Acetic Acid Corrosion of Mild Steel |
title_short |
Investigation of the Electrochemical Mechanisms for Acetic Acid Corrosion of Mild Steel |
title_full |
Investigation of the Electrochemical Mechanisms for Acetic Acid Corrosion of Mild Steel |
title_fullStr |
Investigation of the Electrochemical Mechanisms for Acetic Acid Corrosion of Mild Steel |
title_full_unstemmed |
Investigation of the Electrochemical Mechanisms for Acetic Acid Corrosion of Mild Steel |
title_sort |
investigation of the electrochemical mechanisms for acetic acid corrosion of mild steel |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.sorbonne-universite.fr/hal-01016538 https://doi.org/10.5006/0933 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
ISSN: 0010-9312 Corrosion https://hal.sorbonne-universite.fr/hal-01016538 Corrosion, National Association of Corrosion Engineers, 2014, 70 (3), pp.223-229. ⟨10.5006/0933⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5006/0933 hal-01016538 https://hal.sorbonne-universite.fr/hal-01016538 doi:10.5006/0933 |
op_doi |
https://doi.org/10.5006/0933 |
container_title |
Corrosion |
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70 |
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3 |
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223 |
op_container_end_page |
229 |
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1766387722971250688 |