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The mechanism of cathodic depolarization exhibited by sulphate-reducing bacteria during metallic corrosion processes
Includes bibliographical references.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Chemistry
2015
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| _version_ | 1867613179578679296 |
|---|---|
| access_status_str | Open Access |
| author | Costello, John Anthony |
| author2 | Liesegang, E C |
| author_browse | Costello, John Anthony Liesegang, E C |
| author_facet | Liesegang, E C Costello, John Anthony |
| author_sort | Costello, John Anthony |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/12327 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:00.945Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Department of Chemistry |
| publisherStr | Department of Chemistry |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/12327 The mechanism of cathodic depolarization exhibited by sulphate-reducing bacteria during metallic corrosion processes Costello, John Anthony Liesegang, E C Theoretical Chemistry Includes bibliographical references. The mechanism of the corrosive action of sulphate reducing bacteria of the genus Desulfovibrio towards ferrous metals has been investigated. This corrosive action is anomalous when considered in the light of established knowledge of corrosion processes, since it occurs in the absence of oxygen, at more or less neutral pH values and at ordinary ambient temperatures. The hypothesis of von Wolzogen Kuhr and van der Vlugt, published in 1934, proposing that enzymic catalysis of sulphate reduction by cathodic charge constituted a "cathodic depolarizing" process, which appears t o be widely accepted as the most likely mechanism for this corrosive effect, is evaluated critically here in the light of established electrochemical and biochemical knowledge. The theoret ical arguments presented in this thesis show that this process, if it does occur, is unlikely to affect corrosion rates. The experimental results presented here indicate that all cathodic depolarizing activity demonstrated in pure cultures of these organisms is attributable to the cathodic activity of dissolved hydrogen sulphide produced by the organisms. The conclusions of other workers, quoted in support of proposed enzymic catalysis of charge transfer from cathodes to redox dyes in laboratory systems, are considered, in view of experimental work performed during this investigation, to be a misinterpretation of experimental results. 2015-01-27T10:05:04Z 2015-01-27T10:05:04Z 1975 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/12327 eng application/pdf Department of Chemistry Faculty of Science University of Cape Town |
| spellingShingle | Theoretical Chemistry Costello, John Anthony The mechanism of cathodic depolarization exhibited by sulphate-reducing bacteria during metallic corrosion processes |
| thesis_degree_str | Doctoral |
| title | The mechanism of cathodic depolarization exhibited by sulphate-reducing bacteria during metallic corrosion processes |
| title_full | The mechanism of cathodic depolarization exhibited by sulphate-reducing bacteria during metallic corrosion processes |
| title_fullStr | The mechanism of cathodic depolarization exhibited by sulphate-reducing bacteria during metallic corrosion processes |
| title_full_unstemmed | The mechanism of cathodic depolarization exhibited by sulphate-reducing bacteria during metallic corrosion processes |
| title_short | The mechanism of cathodic depolarization exhibited by sulphate-reducing bacteria during metallic corrosion processes |
| title_sort | mechanism of cathodic depolarization exhibited by sulphate reducing bacteria during metallic corrosion processes |
| topic | Theoretical Chemistry |
| url | http://hdl.handle.net/11427/12327 |
| work_keys_str_mv | AT costellojohnanthony themechanismofcathodicdepolarizationexhibitedbysulphatereducingbacteriaduringmetalliccorrosionprocesses AT costellojohnanthony mechanismofcathodicdepolarizationexhibitedbysulphatereducingbacteriaduringmetalliccorrosionprocesses |