Atmospheric corrosion of iron under a single droplet
A new systematic multi-electrochemical approach
E. Rahimi (TU Delft - Team Arjan Mol)
Keer Zhang (TU Delft - Team Yaiza Gonzalez Garcia)
Ali Kosari (TU Delft - Team Yaiza Gonzalez Garcia)
Nils Van den Steen (Vrije Universiteit Brussel)
A. M. Homborg (TU Delft - Team Arjan Mol, Netherlands Defence Academy)
H.A. Terryn (Vrije Universiteit Brussel)
Johannes M C Mol (TU Delft - Team Arjan Mol)
Y Garcia (TU Delft - Team Yaiza Gonzalez Garcia)
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Abstract
Utilizing a dedicated micro-sized three-electrode cell, this study systematically investigates early-stage electrochemical properties and corrosion behavior of pure iron under single droplets. Various volumes and NaCl concentrations were considered during the evaporation-driven shape and concentration evolution of single droplets. The measurements disclosed that reducing the droplet size from 5 µL to 1.5 µL at 0.01 M NaCl concentration, increased noise resistance (Rn) and polarization resistance (Rp) values. However, at 0.1 M and 0.2 M NaCl concentrations, reducing droplet size led to the domination of relatively high chloride ion concentration over oxygen diffusion, resulting in a very low Rn and Rp and hence enhanced localized corrosion.
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