Respirometric in situ methods for real-time monitoring of corrosion rates: Part II. Immersion

Strebl M, Bruns M, Schulze G, Virtanen S (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Journal of The Electrochemical Society Electrochemical Society

Book Volume: 168

Article Number: 011502

Journal Issue: 1

DOI: 10.1149/1945-7111/abdb4a

Abstract

With the aim to open a new window into corrosion processes this paper presents respirometric methods for real-time in situ monitoring of corrosion rates under immersion conditions. With these techniques, sensitive, non-destructive corrosion rate measurements are possible on basically all metals and alloys. Different methods are presented that enable to monitor HER, ORR or both reactions simultaneously based on the amount of evolved H2 or the amount of consumed O2 by volumetric, manometric and sensor-based approaches. Various research examples are presented, demonstrating the benefits and limitations of the different approaches. For Mg alloys, besides HER, ORR plays a role in the cathodic reactions and a good correlation of the total cathodic charge with mass loss was obtained. H2 dissolution into the electrolyte was identified as an important factor. The results obtained for Zn immersion corrosion in intermittent-flow and flow-through respirometric experiments suggest that the ORR mechanism leads to the generation of stable H2O2 under these conditions. As a result, the effective number of exchanged electrons for one O2 molecule was found to be in between two and four. The here introduced respirometric techniques allow new insights into corrosion mechanisms, in addition to enabling real-time monitoring of corrosion.

Authors with CRIS profile

Michael Strebl Professur für Werkstoffwissenschaften (Korrosion und Oberflächentechnik) Mark Bruns Professur für Werkstoffwissenschaften (Korrosion und Oberflächentechnik) Sannakaisa Virtanen Professur für Werkstoffwissenschaften (Korrosion und Oberflächentechnik)

Additional Organisation(s)

Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)

Related research project(s)

In-situ Characterization of Nanomaterials with Electrons, X-rays/Neutrons and Scanning Probes (GRK 1896) Oct. 1, 2013 - Sept. 30, 2022

How to cite

APA:

Strebl, M., Bruns, M., Schulze, G., & Virtanen, S. (2021). Respirometric in situ methods for real-time monitoring of corrosion rates: Part II. Immersion. Journal of The Electrochemical Society, 168(1). https://doi.org/10.1149/1945-7111/abdb4a

MLA:

Strebl, Michael, et al. "Respirometric in situ methods for real-time monitoring of corrosion rates: Part II. Immersion." Journal of The Electrochemical Society 168.1 (2021).

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