Corrosion Electrochemistry with a Segmented Array Bipolar Electrode

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Abstract

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.

Bibliographical metadata

Original languageEnglish
Pages (from-to)137668
JournalElectrochimica Acta
Volume375
Early online date24 Dec 2020
DOIs
Publication statusPublished - 10 Apr 2021