Microscale chemical imaging to characterize and quantify corrosion processes at the metal-electrolyte interface

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 phas...

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Bibliographic Details
Published in:Npj Materials degradation 2024-01, Vol.8 (1), p.116-9, Article 116
Main Authors: Albert, Cristhiana C., Mundra, Shishir, Ferreira Sanchez, Dario, Furcas, Fabio E., Rajyaguru, Ashish D., Isgor, O. Burkan, Grolimund, Daniel, Angst, Ueli M.
Format: Article
Language:English
Subjects:
639/301/1023
639/301/930
639/638/161/892
639/766/930/12
Absorption spectroscopy
Capillary optics
Chemistry and Materials Science
Corrosion
Corrosion and Coatings
Corrosion potential
Corrosion products
Corrosion rate
Diffusion rate
Electrochemistry
Electrolytes
Interfaces
Iron
Materials Science
Microscopy
Optical microscopy
Oxidation
Precipitates
Scale (corrosion)
Spectrum analysis
Structural Materials
Tribology
X ray absorption
X-ray fluorescence
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Summary: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 O 2 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.
ISSN:2397-2106
2397-2106
DOI:10.1038/s41529-024-00534-x