A study of the electrochemical behaviour of cobalt in aqueous H 2 CO 3 /HCO 3 /CO 3 2 solutions at pH 79
The electrochemical behaviour of a cobalt rotating electrode in H 2 CO 3 /HCO 3 /CO 3 2 aqueous solutions was investigated in the pH region from 7 to 9. The effects of H 2 CO 3 /HCO 3 /CO 3 2 concentration, pH, and the presence of phosphates as inhibitors was explored using a rotating disc ele...
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2004
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crcansciencepubl:10.1139/v04-033 2023-12-17T10:28:42+01:00 A study of the electrochemical behaviour of cobalt in aqueous H 2 CO 3 /HCO 3 /CO 3 2 solutions at pH 79 Simard, Stéphan Gallant, Danick 2004 http://dx.doi.org/10.1139/v04-033 http://www.nrcresearchpress.com/doi/pdf/10.1139/v04-033 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Chemistry volume 82, issue 5, page 583-594 ISSN 0008-4042 1480-3291 Organic Chemistry General Chemistry Catalysis journal-article 2004 crcansciencepubl https://doi.org/10.1139/v04-033 2023-11-19T13:39:29Z The electrochemical behaviour of a cobalt rotating electrode in H 2 CO 3 /HCO 3 /CO 3 2 aqueous solutions was investigated in the pH region from 7 to 9. The effects of H 2 CO 3 /HCO 3 /CO 3 2 concentration, pH, and the presence of phosphates as inhibitors was explored using a rotating disc electrode at 1000 rpm. Some potentiodynamic experiments indicate that for pH 8.5 and higher, carbonate and bicarbonate species play a key role on the rate of electrooxidation of cobalt. For pH lower than 8.5, the electrochemical behaviour of cobalt changes drastically and very aggressive corrosion is observed. The involvement of carbonic acid must be considered in the corrosion process of cobalt in this pH region. The study of passive film potential decay under open circuit potential and galvanostatic reduction was performed on preanodized cobalt electrodes in solutions of various compositions. These experiments indicated the phenomena occurring at the electrodesolution interface during the corrosion process. A mechanism involving competitive adsorption of different species is suggested on the basis of the experimental evidence.Key words: cobalt, bicarbonate, phosphate, carbonic acid, corrosion. Article in Journal/Newspaper Carbonic acid Canadian Science Publishing (via Crossref) Canadian Journal of Chemistry 82 5 583 594 |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
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English |
topic |
Organic Chemistry General Chemistry Catalysis |
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Organic Chemistry General Chemistry Catalysis Simard, Stéphan Gallant, Danick A study of the electrochemical behaviour of cobalt in aqueous H 2 CO 3 /HCO 3 /CO 3 2 solutions at pH 79 |
topic_facet |
Organic Chemistry General Chemistry Catalysis |
description |
The electrochemical behaviour of a cobalt rotating electrode in H 2 CO 3 /HCO 3 /CO 3 2 aqueous solutions was investigated in the pH region from 7 to 9. The effects of H 2 CO 3 /HCO 3 /CO 3 2 concentration, pH, and the presence of phosphates as inhibitors was explored using a rotating disc electrode at 1000 rpm. Some potentiodynamic experiments indicate that for pH 8.5 and higher, carbonate and bicarbonate species play a key role on the rate of electrooxidation of cobalt. For pH lower than 8.5, the electrochemical behaviour of cobalt changes drastically and very aggressive corrosion is observed. The involvement of carbonic acid must be considered in the corrosion process of cobalt in this pH region. The study of passive film potential decay under open circuit potential and galvanostatic reduction was performed on preanodized cobalt electrodes in solutions of various compositions. These experiments indicated the phenomena occurring at the electrodesolution interface during the corrosion process. A mechanism involving competitive adsorption of different species is suggested on the basis of the experimental evidence.Key words: cobalt, bicarbonate, phosphate, carbonic acid, corrosion. |
format |
Article in Journal/Newspaper |
author |
Simard, Stéphan Gallant, Danick |
author_facet |
Simard, Stéphan Gallant, Danick |
author_sort |
Simard, Stéphan |
title |
A study of the electrochemical behaviour of cobalt in aqueous H 2 CO 3 /HCO 3 /CO 3 2 solutions at pH 79 |
title_short |
A study of the electrochemical behaviour of cobalt in aqueous H 2 CO 3 /HCO 3 /CO 3 2 solutions at pH 79 |
title_full |
A study of the electrochemical behaviour of cobalt in aqueous H 2 CO 3 /HCO 3 /CO 3 2 solutions at pH 79 |
title_fullStr |
A study of the electrochemical behaviour of cobalt in aqueous H 2 CO 3 /HCO 3 /CO 3 2 solutions at pH 79 |
title_full_unstemmed |
A study of the electrochemical behaviour of cobalt in aqueous H 2 CO 3 /HCO 3 /CO 3 2 solutions at pH 79 |
title_sort |
study of the electrochemical behaviour of cobalt in aqueous h 2 co 3 /hco 3 /co 3 2 solutions at ph 79 |
publisher |
Canadian Science Publishing |
publishDate |
2004 |
url |
http://dx.doi.org/10.1139/v04-033 http://www.nrcresearchpress.com/doi/pdf/10.1139/v04-033 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Canadian Journal of Chemistry volume 82, issue 5, page 583-594 ISSN 0008-4042 1480-3291 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/v04-033 |
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Canadian Journal of Chemistry |
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82 |
container_issue |
5 |
container_start_page |
583 |
op_container_end_page |
594 |
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1785580880011460608 |