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Electroplating of selective surfaces for concentrating solar collectors
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-5080-8273
2018 (English)In: PROCEEDINGS OF THE ISES EUROSUN 2018 CONFERENCE - 12TH INTERNATIONAL CONFERENCE ON SOLAR ENERGY FOR BUILDINGS AND INDUSTRY / [ed] Haberle, A, International Solar Energy Society, 2018, p. 1086-1095Conference paper, Published paper (Refereed)
Abstract [en]

A spectrally selective surface is produced by electrodeposition of a Co-Cr coating on a stainless steel substrate. The plating bath consisted of CrCl3 center dot 6H(2)O and CoCl2 center dot 6H(2)O dissolved in a deep eutectic solvent (DES) of choline chloride and ethylene glycol. This DES enables the use of trivalent (Cr(III)) instead of hexavalent chromium (Cr(XI)) which significantly reduces health risks associated with chromium electroplating. The selective surface exhibits an absorptance (alpha) of 0.96 and an emittance (epsilon) of 0.13 at 100 degrees C making it well adapted for mid- to lowtemperature concentrating solar collectors. The 1.8 mu m thick coating exhibits a porous structure on the surface as well as throughout the entire coating. The surface of the coating comprises of Co oxides and hydroxides, while the bulk consists of metallic and oxidized Co and only small fractions of Cr compounds. Initial tests of the thermal stability indicate that the coating does not maintain optical properties at an acceptable level over a lifetime of 25 years. At approximately 438 degrees C significant parts of the coating is oxidized in an oxygen rich environment.

Place, publisher, year, edition, pages
International Solar Energy Society, 2018. p. 1086-1095
Keywords [en]
spectrally selective coating, Co-Cr coating, electroplating, absorptance, emittance, surface structure
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-162030DOI: 10.18086/eurosun2018.10.09ISI: 000475550900116ISBN: 978-3-9820408-0-6 (print)OAI: oai:DiVA.org:umu-162030DiVA, id: diva2:1342824
Conference
EuroSun 2018, Rapperswil, Switzerland, september 10-13, 2018
Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-09-05Bibliographically approved

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Zäll, ErikNordenström, AndreasWågberg, Thomas

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