Influence of Thermomechanical Treatments on Corrosion of Carbon Steel in Synthetic Geopolymer Fly Ash Pore Solution
In this study the effect of thermomechanical treatments in chloride induced pitting corrosion is presented for carbon steel rebars exposed to synthetic fly ash (FA) pore solution. Due to the likely phase transformations that steel reinforcements in concrete experience during the event of a fire, the...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-04-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/9/4054 |
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| author | Juan Bosch Ulises Martin Jacob Ress Keston Klimek David M. Bastidas |
| author_facet | Juan Bosch Ulises Martin Jacob Ress Keston Klimek David M. Bastidas |
| author_sort | Juan Bosch |
| collection | DOAJ |
| description | In this study the effect of thermomechanical treatments in chloride induced pitting corrosion is presented for carbon steel rebars exposed to synthetic fly ash (FA) pore solution. Due to the likely phase transformations that steel reinforcements in concrete experience during the event of a fire, the understanding of the corrosion behavior of such phases is key in predicting the stability of the structure. The motivation for this study arrives from the scarce literature regarding the corrosion behavior of thermomechanically treated steel reinforcements in FA environments and the need for further investigation to understand its mechanism. In order to better understand the effects on the corrosion behavior electrochemical measurements including cyclic potentiodynamic polarization curves (CPP) and electrochemical impedance spectroscopy (EIS) were used. It was found that quenched specimens showed enhanced corrosion kinetics as their <i>i</i><sub>corr</sub> values were higher, being of 3.18 × 10<sup>−5</sup> and 2.20 × 10<sup>−5</sup> A/cm<sup>2</sup> for water and oil quenched compared to 2.13 × 10<sup>−6</sup> A/cm<sup>2</sup> for the as-received. Furthermore, the effective capacitance of the double layer (<i>C</i><sub>eff,dl</sub>) showed the lower stability of the passive film for the quenched specimens, with values of 1.11 × 10<sup>−3</sup> µF/cm<sup>2</sup> for the as-receive sample that decreased to 8.12 × 10<sup>−4</sup> µF/cm<sup>2</sup> for the water quenched sample. The anodic charge transfer coefficient in the synthetic FA alkaline pore solution changes from 0.282 to 0.088, for the as-received and water quenched rebars specimens, respectively. These results indicate a lower energy barrier for the anodic dissolution reaction of quenched specimens, indicating that martensite and bainite microstructures promote corrosion process. Enhanced corrosion was found on quenched samples presenting martensite and bainite microstructure as showed by the increased pith depth, with values of 5 μm compared to 1 μm observed in the as-received samples. |
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| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T11:50:08Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj.art-6492bb074d35485986ffa540d4019be02023-11-21T17:44:28ZengMDPI AGApplied Sciences2076-34172021-04-01119405410.3390/app11094054Influence of Thermomechanical Treatments on Corrosion of Carbon Steel in Synthetic Geopolymer Fly Ash Pore SolutionJuan Bosch0Ulises Martin1Jacob Ress2Keston Klimek3David M. Bastidas4National Center for Education and Research on Corrosion and Materials Performance, NCERCAMP-UA, Department Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, 302 E Buchtel Ave, Akron, OH 44325-3906, USANational Center for Education and Research on Corrosion and Materials Performance, NCERCAMP-UA, Department Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, 302 E Buchtel Ave, Akron, OH 44325-3906, USANational Center for Education and Research on Corrosion and Materials Performance, NCERCAMP-UA, Department Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, 302 E Buchtel Ave, Akron, OH 44325-3906, USANational Center for Education and Research on Corrosion and Materials Performance, NCERCAMP-UA, Department Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, 302 E Buchtel Ave, Akron, OH 44325-3906, USANational Center for Education and Research on Corrosion and Materials Performance, NCERCAMP-UA, Department Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, 302 E Buchtel Ave, Akron, OH 44325-3906, USAIn this study the effect of thermomechanical treatments in chloride induced pitting corrosion is presented for carbon steel rebars exposed to synthetic fly ash (FA) pore solution. Due to the likely phase transformations that steel reinforcements in concrete experience during the event of a fire, the understanding of the corrosion behavior of such phases is key in predicting the stability of the structure. The motivation for this study arrives from the scarce literature regarding the corrosion behavior of thermomechanically treated steel reinforcements in FA environments and the need for further investigation to understand its mechanism. In order to better understand the effects on the corrosion behavior electrochemical measurements including cyclic potentiodynamic polarization curves (CPP) and electrochemical impedance spectroscopy (EIS) were used. It was found that quenched specimens showed enhanced corrosion kinetics as their <i>i</i><sub>corr</sub> values were higher, being of 3.18 × 10<sup>−5</sup> and 2.20 × 10<sup>−5</sup> A/cm<sup>2</sup> for water and oil quenched compared to 2.13 × 10<sup>−6</sup> A/cm<sup>2</sup> for the as-received. Furthermore, the effective capacitance of the double layer (<i>C</i><sub>eff,dl</sub>) showed the lower stability of the passive film for the quenched specimens, with values of 1.11 × 10<sup>−3</sup> µF/cm<sup>2</sup> for the as-receive sample that decreased to 8.12 × 10<sup>−4</sup> µF/cm<sup>2</sup> for the water quenched sample. The anodic charge transfer coefficient in the synthetic FA alkaline pore solution changes from 0.282 to 0.088, for the as-received and water quenched rebars specimens, respectively. These results indicate a lower energy barrier for the anodic dissolution reaction of quenched specimens, indicating that martensite and bainite microstructures promote corrosion process. Enhanced corrosion was found on quenched samples presenting martensite and bainite microstructure as showed by the increased pith depth, with values of 5 μm compared to 1 μm observed in the as-received samples.https://www.mdpi.com/2076-3417/11/9/4054thermomechanical treatmentfly ashpost-fire corrosioncorrosion of steelcharge transfer coefficientsynthetic fly ash pore solution |
| spellingShingle | Juan Bosch Ulises Martin Jacob Ress Keston Klimek David M. Bastidas Influence of Thermomechanical Treatments on Corrosion of Carbon Steel in Synthetic Geopolymer Fly Ash Pore Solution Applied Sciences thermomechanical treatment fly ash post-fire corrosion corrosion of steel charge transfer coefficient synthetic fly ash pore solution |
| title | Influence of Thermomechanical Treatments on Corrosion of Carbon Steel in Synthetic Geopolymer Fly Ash Pore Solution |
| title_full | Influence of Thermomechanical Treatments on Corrosion of Carbon Steel in Synthetic Geopolymer Fly Ash Pore Solution |
| title_fullStr | Influence of Thermomechanical Treatments on Corrosion of Carbon Steel in Synthetic Geopolymer Fly Ash Pore Solution |
| title_full_unstemmed | Influence of Thermomechanical Treatments on Corrosion of Carbon Steel in Synthetic Geopolymer Fly Ash Pore Solution |
| title_short | Influence of Thermomechanical Treatments on Corrosion of Carbon Steel in Synthetic Geopolymer Fly Ash Pore Solution |
| title_sort | influence of thermomechanical treatments on corrosion of carbon steel in synthetic geopolymer fly ash pore solution |
| topic | thermomechanical treatment fly ash post-fire corrosion corrosion of steel charge transfer coefficient synthetic fly ash pore solution |
| url | https://www.mdpi.com/2076-3417/11/9/4054 |
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