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The use of vanadium to enhance localised corrosion resistance in 18% chromium ferritic stainless steel
Dissertation (M Eng (Metallurgical Engineering))--University of Pretoria, 2007.
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University of Pretoria
2013
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| _version_ | 1867613569879638016 |
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| access_status_str | Open Access |
| author2 | Pistorius, Petrus Christiaan |
| author_browse | Pistorius, Petrus Christiaan |
| author_facet | Pistorius, Petrus Christiaan |
| collection | Thesis |
| dc_rights_str_mv | © 2000, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (M Eng (Metallurgical Engineering))--University of Pretoria, 2007. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/26412 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:38:14.452Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/26412 The use of vanadium to enhance localised corrosion resistance in 18% chromium ferritic stainless steel Pistorius, Petrus Christiaan upetd@up.ac.za Ras, Mechiel Hendrik Ferritic steel corrosion resistant alloys vanadium UCTD Dissertation (M Eng (Metallurgical Engineering))--University of Pretoria, 2007. In applications where resistance to localised corrosion is required, stainless steel alloys containing molybdenum are generally used thanks to their superior resistance to localised attack in aggressive environments. For ferritic stainless steels, vanadium additions have been found to also have a beneficial effect on the resistance to localised corrosion. In this study vanadium and molybdenum were compared directly as alloying elements in 18% chromium ferritic stainless steel as far as their effect on increasing the resistance to localised corrosion is concerned. Pitting potentials in a neutral chloride solution were used as the criterion for qualifying resistance to localised corrosion and it was shown that vanadium gave similar or slightly higher pitting potentials at addition levels of up to 4% (weight percent). It was subsequently found that the mechanism by which the molybdenum and the vanadium increase the resistance to localised corrosion, are not the same. The experimental data for the molybdenum containing alloys corresponded well with other work done in this field. The positive effect of molybdenum additions on the pitting resistance of these alloys could be explained through its effect in lowering the dissolution rate in the active dissolution region by enriching on the dissolving surface. The vanadium additions to these alloys were shown not to have an effect on the active dissolution kinetics. The effect of these two alloying elements on the initiation of metastable pits were examined, but no meaningful advantage for the vanadium containing alloys over the rest could be found. It is suggested that vanadium play a role in changing the dissolution kinetics of the salt film, which forms during the growth of a metastable pit. A delayed dissolution of salt film remnants would lead to a loss of the enriched pit solution, which would cause the metastable pit to repassivate. Materials Science and Metallurgical Engineering unrestricted 2013-09-07T05:10:03Z 2006-07-19 2013-09-07T05:10:03Z 2001-04-01 2007-07-19 2006-07-19 Dissertation Ras, MH 2000, The use of vanadium to enhance localized corrosion resistance in 18% chromium ferritic stainless steel, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/26412 > H640/ag http://hdl.handle.net/2263/26412 http://upetd.up.ac.za/thesis/available/etd-07192006-155640/ © 2000, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Ferritic steel corrosion resistant alloys vanadium UCTD The use of vanadium to enhance localised corrosion resistance in 18% chromium ferritic stainless steel |
| title | The use of vanadium to enhance localised corrosion resistance in 18% chromium ferritic stainless steel |
| title_full | The use of vanadium to enhance localised corrosion resistance in 18% chromium ferritic stainless steel |
| title_fullStr | The use of vanadium to enhance localised corrosion resistance in 18% chromium ferritic stainless steel |
| title_full_unstemmed | The use of vanadium to enhance localised corrosion resistance in 18% chromium ferritic stainless steel |
| title_short | The use of vanadium to enhance localised corrosion resistance in 18% chromium ferritic stainless steel |
| title_sort | use of vanadium to enhance localised corrosion resistance in 18 chromium ferritic stainless steel |
| topic | Ferritic steel corrosion resistant alloys vanadium UCTD |
| url | http://hdl.handle.net/2263/26412 http://upetd.up.ac.za/thesis/available/etd-07192006-155640/ |