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Anodic Oxidation of Coblt in Neutral and Basic Solution

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J.Electrochem.Soc.125,1735-1740(1978) Anodic oxidation of cobalt .pdf667.63 kBPDFView/Open
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Title: Anodic Oxidation of Coblt in Neutral and Basic Solution
Authors: Sato, Norio Browse this author
Ohtsuka, Toshiaki Browse this author →KAKEN DB
Keywords: anodised layers
cobalt compounds
thin films
electrochemical analysis
Issue Date: Nov-1978
Publisher: The Electrochemical Society
Journal Title: J. Electrochemical Society
Volume: 125
Issue: 11
Start Page: 1735
End Page: 1740
Publisher DOI: 10.1149/1.2131285
Abstract: The anodic oxidation and anodic oxide films of cobalt have been studied in borate buffer solutions in the pH range from 7 to 11. The anodic polarization curve shows the active dissolution, primary passivity, secondary passivity, tertiary passivity, and transpassivation. It is also shown that the anodic oxide film is hydrated oxide of CoO in the primary passive region, bilayered oxide CoO/Co304 in the secondary passive region, and bilayered oxide of CoO/Co203 in the tertiary passive and transpassive regions. The dissolution current of the anodic oxide film in the secondary and tertiary passive regions is much smaller than that in the primary passive region. By cathodic reduction the outer Co203 layer is first converted to Co3O4 and then reduced further to hydrated Co2+ ions before the inner CoO layer is reduced to metallic cobalt.
Rights: © The Electrochemical Society, Inc. 1978. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in J. Electrochem. Soc. 1978 volume 125, issue 11, 1735-1740.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大塚 俊明

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