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Article

On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless Steel

1
Corrosion & Protection Centre, Department of Materials, School of Natural Sciences, The University of Manchester, Manchester M13 9PL, UK
2
Materials Performance Centre, The University of Manchester, Manchester M13 9PL, UK
*
Author to whom correspondence should be addressed.
Metals 2020, 10(6), 794; https://doi.org/10.3390/met10060794
Received: 23 May 2020 / Revised: 10 June 2020 / Accepted: 13 June 2020 / Published: 15 June 2020
(This article belongs to the Special Issue Localized Corrosion of Metals and Alloys)
Bipolar electrochemistry has been applied to Type 420 ferritic stainless steel in order to determine the full spectrum of anodic-to-cathodic polarisation behaviour. The occurrence of crevice corrosion, pitting corrosion in combination with general corrosion, pitting corrosion only, general corrosion only, followed by a cathodic region has been observed. Instances of pitting corrosion initiated near chromium-rich carbides with Cr23C6, Cr3C2, and Cr7C3 identified as pit nucleation sites. The observed pit growth kinetics were independent of the electrochemical over-potential. Characterisation of the pit size distributions supports the presence of a critical dissolved volume for the transition of metastable to stable pit growth and pit coalescence. View Full-Text
Keywords: stainless steel; bipolar electrochemistry; pitting corrosion; chromium carbides; pit growth factor stainless steel; bipolar electrochemistry; pitting corrosion; chromium carbides; pit growth factor
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MDPI and ACS Style

Zhou, Y.; Engelberg, D.L. On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless Steel. Metals 2020, 10, 794. https://doi.org/10.3390/met10060794

AMA Style

Zhou Y, Engelberg DL. On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless Steel. Metals. 2020; 10(6):794. https://doi.org/10.3390/met10060794

Chicago/Turabian Style

Zhou, Yiqi; Engelberg, Dirk L. 2020. "On the Application of Bipolar Electrochemistry to Characterise the Localised Corrosion Behaviour of Type 420 Ferritic Stainless Steel" Metals 10, no. 6: 794. https://doi.org/10.3390/met10060794

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