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Directly monitoring the shift in corrosion mechanisms of a model FeCrNi alloy driven by electric potential

Engineering and Technology

Directly monitoring the shift in corrosion mechanisms of a model FeCrNi alloy driven by electric potential

T. Liu, C. Li, et al.

This groundbreaking study by Tingkun Liu, Cheng-Han Li, Matthew Olszta, Jinhui Tao, and Arun Devaraj delves into the electrochemical corrosion kinetics of austenitic alloys, revealing insights into pit dissolution mechanisms and the influences of electric bias. Discover how these dynamics can enhance our understanding of corrosion across various materials!

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Playback language: English
Abstract
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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