Yule, Lewis C., Bentley, Cameron Luke, West, Geoffrey D., Shollock, Barbara A. and Unwin, Patrick R. (2019) Scanning electrochemical cell microscopy : a versatile method for highly localised corrosion related measurements on metal surfaces. Electrochimica Acta, 298 . pp. 80-88. doi:10.1016/j.electacta.2018.12.054 ISSN 0013-4686.

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Abstract

The development of tools that can probe corrosion related phenomena at the (sub)microscale is recognized to be increasingly important in order to understand the surface structural factors (grain orientation, inclusions etc.) that control the (electro)chemical stability (corrosion susceptibility, pitting, passivity etc.) of metal surfaces. Herein we consider the application of scanning electrochemical cell microscopy (SECCM), a relatively new member of the electrochemical droplet cell (EDC) family, for corrosion research and demonstrate the power of this technique for resolving structure and activity at the (sub)microscale. Hundreds of spatially-resolved (2 μm droplet size) potentiodynamic polarization experiments have been carried out on the several hours timescale and correlated to complementary structural information from electron backscatter diffraction (EBSD) and energy dispersive x-ray spectroscopy (EDS) in order to determine the effect of grain orientation and inclusions on electrochemical processes at low carbon steel in neutral solution (10 mM KNO3). Through this approach, it has been shown unequivocally that for the low index planes, anodic currents in the passive region (an indicator of corrosion susceptibility) are greatest on (101) planes compared to (100) and (111) planes. Furthermore, individual sub-micron MnS inclusions have been probed and shown to undergo active dissolution followed by rapid repassivation. This study demonstrates the high versatility of SECCM and the considerable potential of this technique for addressing structure-activity problems in corrosion and electromaterials science.

Item Type:	Journal Article
Subjects:	T Technology > TN Mining engineering. Metallurgy
Divisions:	Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH):	Metals -- Surfaces, Scanning electrochemical microscopy
Journal or Publication Title:	Electrochimica Acta
Publisher:	Pergamon
ISSN:	0013-4686
Official Date:	1 March 2019
Dates:	Date Event 1 March 2019 Published 11 December 2018 Available 9 December 2018 Accepted
Volume:	298
Page Range:	pp. 80-88
DOI:	10.1016/j.electacta.2018.12.054
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	3 May 2019
Date of first compliant Open Access:	31 July 2019
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID iCASE [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 UNSPECIFIED Tata Steel http://dx.doi.org/10.13039/501100007220 702048 (NEIL) H2020 European Research Council http://dx.doi.org/10.13039/100010663 UNSPECIFIED [RS] Royal Society http://dx.doi.org/10.13039/501100000288

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