Microscale chemical imaging to characterize and quantify corrosion processes at the metal-electrolyte interface
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912613816860672 |
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| author | Albert, Cristhiana C. Mundra, Shishir Sanchez, Dario Ferreira Furcas, Fabio E. Rajyaguru, Ashish D. Isgor, O. Burkan Grolimund, Daniel Angst, Ueli M. |
| author_facet | Albert, Cristhiana C. Mundra, Shishir Sanchez, Dario Ferreira Furcas, Fabio E. Rajyaguru, Ashish D. Isgor, O. Burkan Grolimund, Daniel Angst, Ueli M. |
| contents | We introduce an experimental setup to chemically image corrosion processes at metal-electrolyte interfaces under stagnant, confined conditions relevant in a wide range of situations. The setup is based on a glass capillary, in which precipitation of corrosion products in the interfacial aqueous phase can be monitored over time with optical microscopy, and chemically and structurally characterized with microscopic synchrotron-based techniques (X-ray fluorescence, X-ray diffraction, and X-ray absorption spectroscopy). Moreover, quantification of precipitates through X-ray transmission measurements provides in-situ corrosion rates. We illustrate this setup for iron corrosion in a pH 8 electrolyte, revealing the critical role of O2 and iron diffusion in governing the precipitation of ferrihydrite and its transformation to goethite. Corrosion and coupled reactive transport processes can thus be monitored and fundamentally investigated at the metal-electrolyte interface, with micrometer-scale resolution. This capillary setup has potential applications for in-situ corrosion studies of various metals and environments. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_02327 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Microscale chemical imaging to characterize and quantify corrosion processes at the metal-electrolyte interface Albert, Cristhiana C. Mundra, Shishir Sanchez, Dario Ferreira Furcas, Fabio E. Rajyaguru, Ashish D. Isgor, O. Burkan Grolimund, Daniel Angst, Ueli M. Materials Science Chemical Physics We introduce an experimental setup to chemically image corrosion processes at metal-electrolyte interfaces under stagnant, confined conditions relevant in a wide range of situations. The setup is based on a glass capillary, in which precipitation of corrosion products in the interfacial aqueous phase can be monitored over time with optical microscopy, and chemically and structurally characterized with microscopic synchrotron-based techniques (X-ray fluorescence, X-ray diffraction, and X-ray absorption spectroscopy). Moreover, quantification of precipitates through X-ray transmission measurements provides in-situ corrosion rates. We illustrate this setup for iron corrosion in a pH 8 electrolyte, revealing the critical role of O2 and iron diffusion in governing the precipitation of ferrihydrite and its transformation to goethite. Corrosion and coupled reactive transport processes can thus be monitored and fundamentally investigated at the metal-electrolyte interface, with micrometer-scale resolution. This capillary setup has potential applications for in-situ corrosion studies of various metals and environments. |
| title | Microscale chemical imaging to characterize and quantify corrosion processes at the metal-electrolyte interface |
| topic | Materials Science Chemical Physics |
| url | https://arxiv.org/abs/2408.02327 |