Corrosion electrochemistry with a segmented array bipolar electrode

•Application of bipolar electrochemistry provides access to the full range of anodic-to-cathodic polarisation behaviour.•Potential and current distributions have been experimentally determined using a segmented array bipolar electrode.•Comparison between bipolar electrochemistry and conventional 3-e...

Full description

Saved in:
Bibliographic Details
Published in:Electrochimica acta 2021-04, Vol.375, p.137668, Article 137668
Main Authors: Zhou, Yiqi, Stevens, Nicholas, Engelberg, Dirk Lars
Format: Article
Language:English
Subjects:
Bipolar electrochemistry
Butler–Volmer equation
Pitting
Potentio-dynamic/Potentio-static polarisation
Stainless steel
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Application of bipolar electrochemistry provides access to the full range of anodic-to-cathodic polarisation behaviour.•Potential and current distributions have been experimentally determined using a segmented array bipolar electrode.•Comparison between bipolar electrochemistry and conventional 3-electrode polarisation tests.•Measurements of pitting corrosion kinetics with bipolar electrochemistry. Bipolar electrochemistry was applied to determine the full spectrum of anodic-to-cathodic polarisation behaviour of stainless steel. The potential and current distributions at the sample surface were determined using a segmented array bipolar electrode (BPE). The measured potential shows a quasi-linear gradient along the centre of the BPE, with the current following an exponential Butler–Volmer-type relationship. Bipolar electrochemistry is compared to conventional 3-electrode polarisation testing, allowing determination of the critical pitting potential, general corrosion rates and the cathodic current response. The application of bipolar electrochemistry is demonstrated via measurement of pit growth kinetics in ferritic stainless steel. [Display omitted]
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2020.137668