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Corrosion of ruthenium dioxide based cathodes in alkaline medium caused by reverse currents
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. Permascand AB, Ljungaverk, Sweden .
Department of Physics, Chemistry, and Biology (IFM), Thin Film Physics Division, Linköping University, Linköping, Sweden.
Department of Physics, Chemistry, and Biology (IFM), Thin Film Physics Division, Linköping University, Linköping, Sweden.
Department of Physics, Chemistry, and Biology (IFM), Thin Film Physics Division, Linköping University, Linköping, Sweden.
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2014 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 0019-4686, Vol. 146, no 10, 30-36 p.Article in journal (Refereed) Published
Abstract [en]

A reverse current obtained during power shutdowns in industrial processes, such as chlor-alkali production or alkaline water electrolysis, is deleterious for hydrogen evolving ruthenium dioxide (Ru02) based cathodes. It has been observed that RuO2 coatings after a power shutdown, necessary for e.g. maintenance, are severely damaged unless polarization rectifiers are employed. In this work we show why these types of cathodes are sensitive to reverse currents, i.e. anodic currents, after hydrogen evolution. RuO2 coatings deposited on nickel substrates were subjected to different electrochemical treatments such as hydrogen evolution, oxygen evolution, or reverse currents in 8 M NaOH at 90 degrees C. Polarity inversion was introduced after hydrogen evolution to simulate the effect of reverse currents. Because of chemical interaction with hydrogen, a significant amount of the RuO2 coating was transformed into hydroxylated species during cathodic polarization. Our study shows that these hydroxylated phases are highly sensitive to electrochemical corrosion during anodic polarization after extended hydrogen evolution. (C) 2014 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2014. Vol. 146, no 10, 30-36 p.
Keyword [en]
Corrosion, Hydrogen evolution, Phase transformation, Polarity inversion, RuO2 coatings
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-24040DOI: 10.1016/j.electacta.2014.09.024ISI: 000345226100005Scopus ID: 2-s2.0-84907896128OAI: oai:DiVA.org:miun-24040DiVA: diva2:778249
Available from: 2015-01-09 Created: 2015-01-07 Last updated: 2015-01-09Bibliographically approved

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CiteExportLink to record
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