Classic Evans’s Drop Corrosion Experiment Investigated in Terms of a Tertiary Current and Potential Distribution
Background: Evans’s drop is a classic corrosion experiment that is nearly 100 years old, and it is analogous to other corrosion systems promoted by O<sub>2</sub> gradients. The availability of more robust finite element software packages opens the possibility to reach a deeper understand...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-06-01
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| Series: | Corrosion and Materials Degradation |
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| Online Access: | https://www.mdpi.com/2624-5558/3/2/16 |
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| author | Abraham Sainz-Rosales Xóchitl Ocampo-Lazcarro Azalia Hernández-Pérez Ana Gabriela González-Gutiérrez Erika Roxana Larios-Durán Carlos Ponce de León Frank C. Walsh Maximiliano Bárcena-Soto Norberto Casillas |
| author_facet | Abraham Sainz-Rosales Xóchitl Ocampo-Lazcarro Azalia Hernández-Pérez Ana Gabriela González-Gutiérrez Erika Roxana Larios-Durán Carlos Ponce de León Frank C. Walsh Maximiliano Bárcena-Soto Norberto Casillas |
| author_sort | Abraham Sainz-Rosales |
| collection | DOAJ |
| description | Background: Evans’s drop is a classic corrosion experiment that is nearly 100 years old, and it is analogous to other corrosion systems promoted by O<sub>2</sub> gradients. The availability of more robust finite element software packages opens the possibility to reach a deeper understanding of these kind of corrosion systems. Methodology: In order to solve the problem, the model includes the governing mass transport diffusion and migration equation and the material balance in a nonsteady state by the finite element method. This is performed using COMSOL Multiphysics to predict the tertiary current and potential distribution considering the geometry, reaction kinetics, and mass transport for each ionic species. Significant Findings: A simulation of the tertiary current and potential distribution of the Evans’s drop corrosion experiment on an iron surface is presented. An oxygen concentration difference of 0.18 mol m<sup>−3</sup> between the center and the drop periphery sets up a potential difference of 60 mV which acts as a corrosion driving force. Reaction kinetics are described by Tafel equations. Results include the evolution of concentration profiles for OH<sup>−</sup>, Fe<sup>2+</sup>, Fe<sup>3+</sup>, Fe(OH)<sub>2</sub>, and Fe(OH)<sub>3</sub>. |
| first_indexed | 2024-03-10T00:05:48Z |
| format | Article |
| id | doaj.art-f5f505ea5e47473aaf37642ddb442f83 |
| institution | Directory Open Access Journal |
| issn | 2624-5558 |
| language | English |
| last_indexed | 2024-03-10T00:05:48Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Corrosion and Materials Degradation |
| spelling | doaj.art-f5f505ea5e47473aaf37642ddb442f832023-11-23T16:08:40ZengMDPI AGCorrosion and Materials Degradation2624-55582022-06-013227028010.3390/cmd3020016Classic Evans’s Drop Corrosion Experiment Investigated in Terms of a Tertiary Current and Potential DistributionAbraham Sainz-Rosales0Xóchitl Ocampo-Lazcarro1Azalia Hernández-Pérez2Ana Gabriela González-Gutiérrez3Erika Roxana Larios-Durán4Carlos Ponce de León5Frank C. Walsh6Maximiliano Bárcena-Soto7Norberto Casillas8Department of Chemical Engineering, University of Guadalajara, Blvd. Marcelino García Barragán 1421, Guadalajara 44100, MexicoDepartment of Chemical Engineering, University of Guadalajara, Blvd. Marcelino García Barragán 1421, Guadalajara 44100, MexicoDepartment of Chemical Engineering, University of Guadalajara, Blvd. Marcelino García Barragán 1421, Guadalajara 44100, MexicoDepartment of Chemical Engineering, University of Guadalajara, Blvd. Marcelino García Barragán 1421, Guadalajara 44100, MexicoDepartment of Chemical Engineering, University of Guadalajara, Blvd. Marcelino García Barragán 1421, Guadalajara 44100, MexicoElectrochemical Engineering Laboratory, Energy Technology Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UKElectrochemical Engineering Laboratory, Energy Technology Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UKDepartment of Chemistry, University of Guadalajara, Blvd. Marcelino García Barragán 1421, Guadalajara 44100, MexicoDepartment of Chemistry, University of Guadalajara, Blvd. Marcelino García Barragán 1421, Guadalajara 44100, MexicoBackground: Evans’s drop is a classic corrosion experiment that is nearly 100 years old, and it is analogous to other corrosion systems promoted by O<sub>2</sub> gradients. The availability of more robust finite element software packages opens the possibility to reach a deeper understanding of these kind of corrosion systems. Methodology: In order to solve the problem, the model includes the governing mass transport diffusion and migration equation and the material balance in a nonsteady state by the finite element method. This is performed using COMSOL Multiphysics to predict the tertiary current and potential distribution considering the geometry, reaction kinetics, and mass transport for each ionic species. Significant Findings: A simulation of the tertiary current and potential distribution of the Evans’s drop corrosion experiment on an iron surface is presented. An oxygen concentration difference of 0.18 mol m<sup>−3</sup> between the center and the drop periphery sets up a potential difference of 60 mV which acts as a corrosion driving force. Reaction kinetics are described by Tafel equations. Results include the evolution of concentration profiles for OH<sup>−</sup>, Fe<sup>2+</sup>, Fe<sup>3+</sup>, Fe(OH)<sub>2</sub>, and Fe(OH)<sub>3</sub>.https://www.mdpi.com/2624-5558/3/2/16ironmodelling studiesanodic dissolutionatmospheric corrosionoxidationrust |
| spellingShingle | Abraham Sainz-Rosales Xóchitl Ocampo-Lazcarro Azalia Hernández-Pérez Ana Gabriela González-Gutiérrez Erika Roxana Larios-Durán Carlos Ponce de León Frank C. Walsh Maximiliano Bárcena-Soto Norberto Casillas Classic Evans’s Drop Corrosion Experiment Investigated in Terms of a Tertiary Current and Potential Distribution Corrosion and Materials Degradation iron modelling studies anodic dissolution atmospheric corrosion oxidation rust |
| title | Classic Evans’s Drop Corrosion Experiment Investigated in Terms of a Tertiary Current and Potential Distribution |
| title_full | Classic Evans’s Drop Corrosion Experiment Investigated in Terms of a Tertiary Current and Potential Distribution |
| title_fullStr | Classic Evans’s Drop Corrosion Experiment Investigated in Terms of a Tertiary Current and Potential Distribution |
| title_full_unstemmed | Classic Evans’s Drop Corrosion Experiment Investigated in Terms of a Tertiary Current and Potential Distribution |
| title_short | Classic Evans’s Drop Corrosion Experiment Investigated in Terms of a Tertiary Current and Potential Distribution |
| title_sort | classic evans s drop corrosion experiment investigated in terms of a tertiary current and potential distribution |
| topic | iron modelling studies anodic dissolution atmospheric corrosion oxidation rust |
| url | https://www.mdpi.com/2624-5558/3/2/16 |
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