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  In situ nano- to microscopic imaging and growth mechanism of electrochemical dissolution (e.g., corrosion) of a confined metal surface

Merola, C., Cheng, H.-W., Schwenzfeier, K., Kristiansen, K., Chen, Y.-J., Dobbs, H. A., et al. (2017). In situ nano- to microscopic imaging and growth mechanism of electrochemical dissolution (e.g., corrosion) of a confined metal surface. Proceedings of the National Academy of Sciences of the United States of America, 114(36), 9541-9546. doi:10.1073/pnas.1708205114.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-60EA-B Version Permalink: http://hdl.handle.net/21.11116/0000-0001-60ED-8
Genre: Journal Article

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 Creators:
Merola, Claudia1, Author              
Cheng, Hsiu-Wei1, Author              
Schwenzfeier, Kai2, Author              
Kristiansen, Kai3, Author              
Chen, Ying-Ju1, Author              
Dobbs, Howard A.4, Author              
Israelachvili, Jacob N.4, Author              
Valtiner, Markus1, Author              
Affiliations:
1Interaction Forces and Functional Materials, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863357              
2Interface Spectroscopy, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863358              
3Department of Chemical Engineering, University of California, Santa Barbara, CA, USA, ou_persistent22              
4Department of Chemical Engineering, University of California, Santa Barbara, CA 93106-5080, USA, ou_persistent22              

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Free keywords: MULTIPLE-BEAM INTERFEROMETRY; CREVICE CORROSION; PITTING CORROSION; PRESSURE SOLUTION; PASSIVITY BREAKDOWN; STAINLESS-STEELS; NICKEL; INITIATION; FORCES; FILMSScience & Technology - Other Topics; crevice corrosion; surface forces apparatus; pitting dynamics; surface electrochemistry;
 Abstract: Reactivity in confinement is central to a wide range of applications and systems, yet it is notoriously difficult to probe reactions in confined spaces in real time. Using a modified electrochemical surface forces apparatus (EC-SFA) on confined metallic surfaces, we observe in situ nano- to microscale dissolution and pit formation (qualitatively similar to previous observation on nonmetallic surfaces, e.g., silica) in well-defined geometries in environments relevant to corrosion processes. We follow "crevice corrosion" processes in real time in different pH-neutral NaCl solutions and applied surface potentials of nickel (vs. Ag vertical bar AgCl electrode in solution) for the mica-nickel confined interface of total area similar to 0.03 mm(2). The initial corrosion proceeds as self-catalyzed pitting, visualized by the sudden appearance of circular pits with uniform diameters of 6-7 mu m and depth similar to 2-3 nm. At concentrations above 10 mM NaCl, pitting is initiated at the outer rim of the confined zone, while below 10 mM NaCl, pitting is initiated inside the confined zone. We compare statistical analysis of growth kinetics and shape evolution of individual nanoscale deep pits with estimates from macroscopic experiments to study initial pit growth and propagation. Our data and experimental techniques reveal a mechanism that suggests initial corrosion results in formation of an aggressive interfacial electrolyte that rapidly accelerates pitting, similar to crack initiation and propagation within the confined area. These results support a general mechanism for nanoscale material degradation and dissolution (e.g., crevice corrosion) of polycrystalline nonnoble metals, alloys, and inorganic materials within confined interfaces.

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Language(s): eng - English
 Dates: 2017-09-05
 Publication Status: Published in print
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000409182200039
DOI: 10.1073/pnas.1708205114
 Degree: -

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Title: Proceedings of the National Academy of Sciences of the United States of America
  Other : Proceedings of the National Academy of Sciences of the USA
  Other : Proc. Acad. Sci. USA
  Other : Proc. Acad. Sci. U.S.A.
  Abbreviation : PNAS
Source Genre: Journal
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Publ. Info: Washington, D.C. : National Academy of Sciences
Pages: - Volume / Issue: 114 (36) Sequence Number: - Start / End Page: 9541 - 9546 Identifier: ISSN: 0027-8424
CoNE: /journals/resource/954925427230