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  Cyclodextrin inhibits zinc corrosion by destabilizing point defect formation in the oxide layer

Altin, A., Krzywiecki, M., Sarfraz, A., Toparli, C., Laska, C. A., Kerger, P., et al. (2018). Cyclodextrin inhibits zinc corrosion by destabilizing point defect formation in the oxide layer. Beilstein Journal of Nanotechnology, 9, 936-944. doi:10.3762/bjnano.9.86.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-213C-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-2145-C
Genre: Journal Article

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 Creators:
Altin, Abdulrahman1, Author              
Krzywiecki, Maciej1, 2, Author              
Sarfraz, Adnan1, Author              
Toparli, Cigdem1, Author              
Laska, Claudius Alexander3, Author              
Kerger, Philipp4, Author              
Žeradjanin, Aleksandar R.3, 5, Author              
Mayrhofer, Karl J. J.3, 6, Author              
Rohwerder, Michael4, Author              
Erbe, Andreas1, 7, Author              
Affiliations:
1Interface Spectroscopy, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863358              
2Institute of Physics – CSE, Silesian University of Technology, B. Krzywoustego 2, 44–100 Gliwice, Poland, ou_persistent22              
3Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863354              
4Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2074315              
5Forschungszentrum Jülich GmbH, Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Egerlandstraße 3, 91058 Erlangen, Germany, ou_persistent22              
6Helmholtz-Institute Erlangen-Nuremberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Egerlandstrasse 3, 91058 Erlangen, Germany, ou_persistent22              
7Department of Materials Science and Engineering, NTNU - Norwegian University of Science and Technology, 7491 Trondheim, Norway, ou_persistent22              

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Free keywords: THIN-FILMS; SPECTROSCOPIC ELLIPSOMETRY; ELECTROCHEMICAL TREATMENT; BETA-CYCLODEXTRIN; ICP-MS; ENERGY; CHARGE; CELL; QUANTIFICATION; DISSOLUTIONScience & Technology - Other Topics; Materials Science; Physics; band diagram; defect chemistry; organic corrosion inhibitors; X-ray photoelectron spectroscopy; zinc corrosion;
 Abstract: Corrosion inhibitors are added in low concentrations to corrosive solutions for reducing the corrosion rate of a metallic material. Their mechanism of action is typically the blocking of free metal surface by adsorption, thus slowing down dissolution. This work uses electrochemical impedance spectroscopy to show the cyclic oligosaccharide beta-cyclodextrin (beta-CD) to inhibit corrosion of zinc in 0.1M chloride with an inhibition efficiency of up to 85%. Only a monomolecular adsorption layer of beta-CD is present on the surface of the oxide covered metal, with Raman spectra of the interface proving the adsorption of the intact beta-CD. Angular dependent X-ray photoelectron spectroscopy (ADXPS) and ultraviolet photoelectron spectroscopy (UPS) were used to extract a band-like diagram of the beta-CD/ZnO interface, showing a large energy level shift at the interface, closely resembling the energy level alignment in an n-p junction. The energy level shift is too large to permit further electron transfer through the layer, inhibiting corrosion. Adsorption hence changes the defect density in the protecting ZnO layer. This mechanism of corrosion inhibition shows that affecting the defect chemistry of passivating films by molecular inhibitors maybe a viable strategy to control corrosion of metals.

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Language(s): eng - English
 Dates: 2018-02-122018-03-20
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000428704900001
DOI: 10.3762/bjnano.9.86
 Degree: -

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Title: Beilstein Journal of Nanotechnology
Source Genre: Journal
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Publ. Info: Frankfurt am Main : Beilstein-Institut
Pages: - Volume / Issue: 9 Sequence Number: - Start / End Page: 936 - 944 Identifier: ISSN: 2190-4286
CoNE: /journals/resource/2190-4286