Time-lapse Observation of Pitting Corrosion in Ferritic Stainless Steel under Bipolar Electrochemistry Control

Yiqi Zhou; Dirk Engelberg

doi:10.1016/j.jelechem.2021.115599

Time-lapse Observation of Pitting Corrosion in Ferritic Stainless Steel under Bipolar Electrochemistry Control

Yiqi Zhou, Dirk Engelberg

Materials Engineering

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Abstract

A bipolar electrochemistry approach has been applied to characterise pit nucleation and growth kinetics in 13% Cr ferritic stainless steel. In-situ time-lapse imaging, supported by laser confocal microscopy measurements, were applied to obtain pit nucleation frequencies and associated pit growth characteristics. The development of champion pits is observed, and the effect of pit shape and aspect ratio on pit nucleation and growth are discussed. Pits preferentially nucleated and grew with depth to width aspect ratios of 0.4-0.6. The observed pit growth kinetics are independent of pit volume and the acting potentials.

Original language	English
Article number	115599
Pages (from-to)	1-7
Number of pages	7
Journal	Journal of Electroanalytical Chemistry
Volume	899
Early online date	16 Aug 2021
DOIs	https://doi.org/10.1016/j.jelechem.2021.115599
Publication status	Published - 15 Oct 2021

Keywords

Bipolar electrochemistry
Pit growth kinetics
Pitting corrosion
Stainless steel

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10.1016/j.jelechem.2021.115599

Time-lapse Observation of Pitting Corrosion in Ferritic Stainless Steel under Bipolar Electrochemistry ControlAccepted author manuscript, 6.02 MB

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title = "Time-lapse Observation of Pitting Corrosion in Ferritic Stainless Steel under Bipolar Electrochemistry Control",

abstract = "A bipolar electrochemistry approach has been applied to characterise pit nucleation and growth kinetics in 13% Cr ferritic stainless steel. In-situ time-lapse imaging, supported by laser confocal microscopy measurements, were applied to obtain pit nucleation frequencies and associated pit growth characteristics. The development of champion pits is observed, and the effect of pit shape and aspect ratio on pit nucleation and growth are discussed. Pits preferentially nucleated and grew with depth to width aspect ratios of 0.4-0.6. The observed pit growth kinetics are independent of pit volume and the acting potentials. ",

keywords = "Bipolar electrochemistry, Pit growth kinetics, Pitting corrosion, Stainless steel",

author = "Yiqi Zhou and Dirk Engelberg",

note = "Funding Information: The authors acknowledge the support of the Henry Royce Institute for access to the Keyence laser scanning confocal microscope at Royce@Manchester (EP/R00661X/1). Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

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AU - Engelberg, Dirk

N1 - Funding Information: The authors acknowledge the support of the Henry Royce Institute for access to the Keyence laser scanning confocal microscope at Royce@Manchester (EP/R00661X/1). Publisher Copyright: © 2021 Elsevier B.V.

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N2 - A bipolar electrochemistry approach has been applied to characterise pit nucleation and growth kinetics in 13% Cr ferritic stainless steel. In-situ time-lapse imaging, supported by laser confocal microscopy measurements, were applied to obtain pit nucleation frequencies and associated pit growth characteristics. The development of champion pits is observed, and the effect of pit shape and aspect ratio on pit nucleation and growth are discussed. Pits preferentially nucleated and grew with depth to width aspect ratios of 0.4-0.6. The observed pit growth kinetics are independent of pit volume and the acting potentials.

AB - A bipolar electrochemistry approach has been applied to characterise pit nucleation and growth kinetics in 13% Cr ferritic stainless steel. In-situ time-lapse imaging, supported by laser confocal microscopy measurements, were applied to obtain pit nucleation frequencies and associated pit growth characteristics. The development of champion pits is observed, and the effect of pit shape and aspect ratio on pit nucleation and growth are discussed. Pits preferentially nucleated and grew with depth to width aspect ratios of 0.4-0.6. The observed pit growth kinetics are independent of pit volume and the acting potentials.

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Time-lapse Observation of Pitting Corrosion in Ferritic Stainless Steel under Bipolar Electrochemistry Control

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