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Quantitative interpretation of potentiodynamic polarization curves obtained at high scan rates in scanning electrochemical cell microscopy

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1021/acs.analchem.4c01476
AuthorSearch for: ; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-3322-708X; Search for: ; Search for: ; Search for: 1ORCID identifier: https://orcid.org/0000-0003-4752-7507
Affiliation
  1. National Research Council of Canada. Automotive and Surface Transportation
FunderSearch for: Centre québécois de recherche et de développement de l’aluminium; Search for: Natural Sciences and Engineering Research Council of Canada
FormatText, Article
Subjectdiffusion; electrochemistry; oxidation; oxides; phosphates
Abstract
Scanning electrochemical cell microscopy is becoming the tool of choice for the investigation of localized metal corrosion. Typically, potentiodynamic polarization measurements in scanning electrochemical cell microscopy are performed at high potential scan rates. However, Tafel extrapolation applied to high-scan-rate potentiodynamic polarization curves would yield inaccurate corrosion kinetics due to the interference of double-layer charging current or mass transport of species in the metal oxide. Instead, the high field model was used to simulate the potentiodynamic polarization curves of pure aluminum at 25, 50, 100, and 200 mV/s in neutral and acidic phosphate solutions, thus enabling quantitative analysis of local corrosion kinetics by fitting the potentiodynamic polarization curve.
Publication date
PublisherAmerican Chemical Society
In
  • Analytical Chemistry 96, no. 38 (10 September 2024): 15108–15116.
LanguageEnglish
Peer reviewedYes
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Record identifier91f94baa-bf74-45c2-ad9f-8067e76d9e08
Record created2024-10-15
Record modified2024-11-05
Date modified: