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Cathodic Corrosion of Zinc under Potentiostatic Conditions in NaCl Solutions
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. Université de Bretagne Occidentale, France. (Institut de la Corrosion)
Université de Bretagne Occidentale, France.
Université de Bretagne Occidentale, France.
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2018 (English)In: ChemElectroChem, ISSN 2196-0216, Vol. 5, no 8, p. 1203-1211Article in journal (Refereed) Published
Abstract [en]

Zinc electrodes were polarized cathodically at moderate overpotentials in NaCl 0.6 M solutions under potentiostatic conditions for 7 to 17 hours at room temperature. Corrosion products were characterized by using optical microscopy, XRD, Raman microscopy, XPS, and FIB-SEM. Close to the open-circuit potential, the corrosion products were formed by simonkolleite and the electrochemical response exhibits anodic features. At more negative potentials, the current density remains cathodic throughout the polarization and the deposits on the electrode surface consist almost solely of ZnO. The soluble zinc species necessary for ZnO deposition originate from localized dissolution of the substrate in the form of pits. This effect is assigned to the strong alkalinization of the surface due to oxygen reduction. Despite developing greater surface area than bare zinc substrates, the nanostructured ZnO deposits reduced the cathodic activity.

Place, publisher, year, edition, pages
Wiley-VCH Verlag , 2018. Vol. 5, no 8, p. 1203-1211
Keywords [en]
corrosion, electrodeposition, oxygen reduction, pitting, zinc oxide, Chlorine compounds, Deposits, Electrodes, Electrolytic reduction, Reduction, Substrates, Zinc, Zinc compounds, Corrosion products, Electrochemical response, Electrode surfaces, Nanostructured ZnO, Negative potential, Open circuit potential, Potentiostatic conditions, Sodium compounds
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40486DOI: 10.1002/celc.201701325Scopus ID: 2-s2.0-85042061862OAI: oai:DiVA.org:ri-40486DiVA, id: diva2:1359898
Note

 Funding details: Association Nationale de la Recherche et de la Technologie, ANRT; Funding details: Association Nationale de la Recherche et de la Technologie, ANRT, 2016/0066; Funding text 1: The Association Nationale de la Recherche et de la Technologie (ANRT, Paris, France) is gratefully acknowledged for financial support of J. Soares Costa (convention CIFRE n° 2016/0066). The authors express gratitude to P. Gasser (ScopEM, ETH Zurich) for technical support with FIB-SEM analysis. Dr. E. Diler and Dr. B. Tribollet are thanked for fruitful discussions on zinc corrosion and Dr. K. Pelissier for assistance with Raman microscopy.

Available from: 2019-10-10 Created: 2019-10-10 Last updated: 2019-10-10Bibliographically approved

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