Bruns M, Strebl M, Virtanen S (2025)
Publication Type: Journal article
Publication year: 2025
Book Volume: 172
Pages Range: 110510
Issue: 11
Electrochemical impedance spectroscopy (EIS) is a powerful and well-established technique in corrosion research; however, in some cases there are challenges in interpreting the data. Here, we combined EIS investigations on corrosion of Zn and Ni with respirometry. Respirometry is an emerging technique based on real-time monitoring of the cathodic reaction rates: hydrogen evolution reaction and oxygen reduction reaction (ORR). Information regarding the entirety of cathodic reactions was obtained by also considering the 2-electron pathway for ORR, resulting in H2O2 evolution. The EIS charges calculated via Stern-Geary approximation are in good agreement with respirometric and mass loss charges. The combination of these methods allows for real-time calculation of the Stern-Geary proportionality constant B. If corrosion occurs under diffusion limitation, the anodic Tafel slope βa and the diffusion coefficient for O2 can be calculated. As the corrosion mechanism (for Zn) changed over time, the EIS spectra changed, coinciding with the O2 depletion in respirometric measurements, indicating diffusion limitation. Therefore, a Warburg element was included in the equivalent circuit and the resulting fits are in very good agreement with the measured data. Coupling EIS with respirometry can help in identifying valid equivalent circuits as well as enable real-time calculation of corrosion parameters.
APA:
Bruns, M., Strebl, M., & Virtanen, S. (2025). Respirometric In Situ Methods for Real-Time Monitoring of Corrosion Rates: Part IV. Assisting Electrochemical Impedance Spectroscopy. Journal of The Electrochemical Society, 172, 110510. https://doi.org/10.1149/1945-7111/ae1668
MLA:
Bruns, Mark, Michael Strebl, and Sannakaisa Virtanen. "Respirometric In Situ Methods for Real-Time Monitoring of Corrosion Rates: Part IV. Assisting Electrochemical Impedance Spectroscopy." Journal of The Electrochemical Society 172 (2025): 110510.
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