This study quantified the aqueous corrosion kinetics of a model austenitic Fe-18Cr-14Ni (wt%) alloy using in situ electrochemical atomic force microscopy (EC-AFM) and transmission electron microscopy (TEM). Without applied potential, vertical pit dissolution followed a surface kinetics/diffusion hybrid mechanism, while lateral dissolution was diffusion-controlled. Applying an electric bias increased the corrosion rate primarily through increased pit nucleation. These in situ EC-AFM insights offer a quantitative understanding of corrosion applicable to a wider range of materials.
Publisher
npj Materials Degradation
Published On
May 24, 2023
Authors
Tingkun Liu, Cheng-Han Li, Matthew Olszta, Jinhui Tao, Arun Devaraj
Tags
corrosion kinetics
austenitic alloy
electrochemical microscopy
pit dissolution
electric bias
in situ analysis
quantitative understanding
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