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Chromium coatings from trivalent chromium plating baths: Characterization and cathodic delamination behaviour

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Prabhakar,  J. Manoj
Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Varanasi,  Rama Srinivas
Alloy Design and Thermomechanical Processing, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Corrêa da Silva,  Cauê
Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Erbe,  Andreas
Department of Materials Science and Engineering, NTNU - Norwegian University of Science and Technology, 7491 Trondheim, Norway;
Interface Spectroscopy, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Rohwerder,  Michael
Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Prabhakar, J. M., Varanasi, R. S., Corrêa da Silva, C., de Vooys, A., Erbe, A., & Rohwerder, M. (2021). Chromium coatings from trivalent chromium plating baths: Characterization and cathodic delamination behaviour. Corrosion Science, 187: 109525. doi:10.1016/j.corsci.2021.109525.


Cite as: https://hdl.handle.net/21.11116/0000-0008-A641-3
Abstract
Novel two-layer chromium-based coatings comprised of a first layer containing chromium, oxygen and carbon (Cr-O-C) and an oxygen rich (Cr-O) topcoat were electrodeposited from trivalent chromium electrolyte. The complex structure and composition of the coatings were studied using complementary characterization techniques. The electrodeposited oxide was found to be amorphous and oxygen-deficient. In operando ambient pressure X-ray photoelectron spectroscopy when heating the sample from room temperature to 450 °C and Raman spectroscopy after the heating ascertained the metastable nature of the oxide. The cathodic delamination of a weak model polymer on these samples was studied using in situ scanning Kelvin probe. © 2021 The Author(s)