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

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons125321

Posner,  Ralf
Christian Doppler Laboratory for Metal/Polymer Interfaces, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons125139

Fink,  Nicole
Christian Doppler Laboratory for Metal/Polymer Interfaces, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-E292-8
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.