Effect of Phosphate-Based Inhibitor on Corrosion Kinetics and Mechanism for Formation of Passive Film onto the Steel Rebar in Chloride-Containing Pore Solution
In the present study, different contents, i.e., 1–3% of 0.5 M ammonium phosphate mono basic (APMB), were used as corrosion inhibitor to reduce the corrosion of steel rebar. Electrochemical impedance spectroscopy (EIS) results showed that up to 24 h of exposure, polarization resistance (<i>R<...
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MDPI AG
2020-08-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/16/3642 |
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| author | Soumen Mandal Jitendra Kumar Singh Dong-Eun Lee Taejoon Park |
| author_facet | Soumen Mandal Jitendra Kumar Singh Dong-Eun Lee Taejoon Park |
| author_sort | Soumen Mandal |
| collection | DOAJ |
| description | In the present study, different contents, i.e., 1–3% of 0.5 M ammonium phosphate mono basic (APMB), were used as corrosion inhibitor to reduce the corrosion of steel rebar. Electrochemical impedance spectroscopy (EIS) results showed that up to 24 h of exposure, polarization resistance (<i>R<sub>p</sub></i>) and passive/oxide film resistance (<i>R<sub>o</sub></i>) gradually decreased in simulated concrete pore (SCP) + 3.5 wt.% NaCl solution owing to the reduction in pH of the solution. The steel rebar exposed in 2% inhibitor containing SCP + 3.5 wt.% NaCl solution exhibited 90% inhibition efficiency after 1 h of exposure. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy confirmed the formation of thermodynamically very stable and sparingly soluble goethite (α-FeOOH), maghemite (γ-Fe<sub>2</sub>O<sub>3</sub>), and iron phosphate (FePO<sub>4</sub>) as passive/oxide film onto the steel rebar surface exposed to 2% inhibitor containing SCP + 3.5 wt.% NaCl solution. |
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| id | doaj.art-8c195d1ba2dc4ab7b77dbc632320cff0 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T17:18:24Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
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| spelling | doaj.art-8c195d1ba2dc4ab7b77dbc632320cff02023-11-20T10:25:07ZengMDPI AGMaterials1996-19442020-08-011316364210.3390/ma13163642Effect of Phosphate-Based Inhibitor on Corrosion Kinetics and Mechanism for Formation of Passive Film onto the Steel Rebar in Chloride-Containing Pore SolutionSoumen Mandal0Jitendra Kumar Singh1Dong-Eun Lee2Taejoon Park3Intelligent Construction Automation Center, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, KoreaInnovative Durable Building and Infrastructure Research Center, Department of Architectural Engineering, Hanyang University, 1271 Sa3-dong, Sangrok-gu, Ansan 15588, KoreaSchool of Architecture, Civil, Environment, and Energy, Kyungpook National University, 1370, Sangyegk-Dong, Buk-Gu, Daegu 702-701, KoreaDepartment of Robotics Engineering, Hanyang University, 55 Hanyangdaehak-ro, Ansan, Gyeonggi-do 15588, KoreaIn the present study, different contents, i.e., 1–3% of 0.5 M ammonium phosphate mono basic (APMB), were used as corrosion inhibitor to reduce the corrosion of steel rebar. Electrochemical impedance spectroscopy (EIS) results showed that up to 24 h of exposure, polarization resistance (<i>R<sub>p</sub></i>) and passive/oxide film resistance (<i>R<sub>o</sub></i>) gradually decreased in simulated concrete pore (SCP) + 3.5 wt.% NaCl solution owing to the reduction in pH of the solution. The steel rebar exposed in 2% inhibitor containing SCP + 3.5 wt.% NaCl solution exhibited 90% inhibition efficiency after 1 h of exposure. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy confirmed the formation of thermodynamically very stable and sparingly soluble goethite (α-FeOOH), maghemite (γ-Fe<sub>2</sub>O<sub>3</sub>), and iron phosphate (FePO<sub>4</sub>) as passive/oxide film onto the steel rebar surface exposed to 2% inhibitor containing SCP + 3.5 wt.% NaCl solution.https://www.mdpi.com/1996-1944/13/16/3642steelconcrete pore solutioncorrosioninhibitorelectrochemical impedance spectroscopyRaman spectroscopy |
| spellingShingle | Soumen Mandal Jitendra Kumar Singh Dong-Eun Lee Taejoon Park Effect of Phosphate-Based Inhibitor on Corrosion Kinetics and Mechanism for Formation of Passive Film onto the Steel Rebar in Chloride-Containing Pore Solution Materials steel concrete pore solution corrosion inhibitor electrochemical impedance spectroscopy Raman spectroscopy |
| title | Effect of Phosphate-Based Inhibitor on Corrosion Kinetics and Mechanism for Formation of Passive Film onto the Steel Rebar in Chloride-Containing Pore Solution |
| title_full | Effect of Phosphate-Based Inhibitor on Corrosion Kinetics and Mechanism for Formation of Passive Film onto the Steel Rebar in Chloride-Containing Pore Solution |
| title_fullStr | Effect of Phosphate-Based Inhibitor on Corrosion Kinetics and Mechanism for Formation of Passive Film onto the Steel Rebar in Chloride-Containing Pore Solution |
| title_full_unstemmed | Effect of Phosphate-Based Inhibitor on Corrosion Kinetics and Mechanism for Formation of Passive Film onto the Steel Rebar in Chloride-Containing Pore Solution |
| title_short | Effect of Phosphate-Based Inhibitor on Corrosion Kinetics and Mechanism for Formation of Passive Film onto the Steel Rebar in Chloride-Containing Pore Solution |
| title_sort | effect of phosphate based inhibitor on corrosion kinetics and mechanism for formation of passive film onto the steel rebar in chloride containing pore solution |
| topic | steel concrete pore solution corrosion inhibitor electrochemical impedance spectroscopy Raman spectroscopy |
| url | https://www.mdpi.com/1996-1944/13/16/3642 |
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