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  Electrochemical electrolyte spreading studies of the protective properties of ultra-thin films on zinc galvanized steel

Posner, R., Fink, N., Wolpers, M., & Grundmeier, G. (2013). Electrochemical electrolyte spreading studies of the protective properties of ultra-thin films on zinc galvanized steel. Surface and Coatings Technology, 228, 286-295. doi:10.1016/j.surfcoat.2013.04.042.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-E292-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-E293-6
Genre: Journal Article

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 Creators:
Posner, Ralf1, Author              
Fink, Nicole1, Author              
Wolpers, Michael2, Author              
Grundmeier, Guido3, Author              
Affiliations:
1Christian Doppler Laboratory for Metal/Polymer Interfaces, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863353              
2Henkel AG and Co. KGaA, Henkelstr. 67, 40589 Düsseldorf, Germany, ou_persistent22              
3University of Paderborn, Department of Technical and Macromolecular Chemistry, Warburger Str. 100, 33098 Paderborn, Germany, ou_persistent22              

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Free keywords: INDUCED ATMOSPHERIC CORROSION; OXIDE COVERED IRON; POLYMERIC COATINGS; POLYMER/OXIDE/METAL INTERFACES; MECHANISTIC APPROACH; TRANSPORT PROCESSES; ELECTROGALVANIZED STEEL; HYDRATED IONS; PART 3; DELAMINATIONMaterials Science; Physics; Conversion coating; Reactive electrolyte spreading; Accelerated corrosion testing; Cathodic delamination; Zinc galvanized steel;
 Abstract: Reactive electrolyte spreading along the surfaces of different conversion films on zinc galvanized steel in humid air was monitored visually and with a height-regulated scanning Kelvin Probe. Electrochemical impedance spectroscopy and current density-potential curves revealed that decelerated spreading kinetics are connected with increasing pore resistances of the pre-treatment layers and decreasing oxygen reduction current densities in the electron transfer controlled potential region. After a few days the progress ranking of electrolyte spreading along uncoated conversion films reflected the progress tendencies of cathodic delamination observed on epoxy coated conversion layers after long-time exposure to the same corrosive environment Such correlation was not discovered for pre-treatment films that do not provide relevant electrochemical barrier properties. The results suggest that oxygen reduction driven electrolyte wetting is an option for accelerated performance testing of anticorrosive ultra-thin films on metal substrates that can be subject to cathodic delamination. (C) 2013 Elsevier B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2013-08
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Degree: -

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Title: Surface and Coatings Technology
Source Genre: Journal
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Publ. Info: Lausanne : Elsevier
Pages: - Volume / Issue: 228 Sequence Number: - Start / End Page: 286 - 295 Identifier: ISSN: 0257-8972
CoNE: https://pure.mpg.de/cone/journals/resource/954925496044