| Autor: |
Zhou H; Department of Chemistry, McGill University, Montreal, QC H3A 0B8, Canada., Chhin D; Department of Chemistry, McGill University, Montreal, QC H3A 0B8, Canada., Li Y; Department of Chemistry, McGill University, Montreal, QC H3A 0B8, Canada., Gallant D; Automotive and Surface Transportation Research Centre, Division of Transportation and Manufacturing, Aluminum Technology Center, National Research Council Canada, Saguenay, QC G7H 8C3, Canada., Morel A; Automotive and Surface Transportation Research Centre, Division of Transportation and Manufacturing, Aluminum Technology Center, National Research Council Canada, Saguenay, QC G7H 8C3, Canada., Mauzeroll J; Department of Chemistry, McGill University, Montreal, QC H3A 0B8, Canada. |
| Abstrakt: |
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. |
