The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel

Clark, Ronald N.; Chan, Choen May; Martin, Tomas L.; Walters, W.S.; Engelberg, Dirk; Burrows, Robert; Williams, Geraint

doi:10.1016/j.corsci.2020.108596

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The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel

Ronald N. Clark

, Choen May Chan, Tomas L. Martin, W.S. Walters, Dirk Engelberg, Robert Burrows, Geraint Williams

Corrosion Science, Volume: 170, Start page: 108596

Swansea University Authors: Ronald N. Clark , Geraint Williams

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DOI (Published version): 10.1016/j.corsci.2020.108596

Abstract

Niobium-stabilised austenitic stainless steel (20Cr-25Ni-Nb) has been immersed in sodium hydroxide, which is used as a corrosion inhibitor. The work shows how NbC precipitates may be degraded by use of pH 13 NaOH. Initial electrochemical measurements indicate that there is no benefit to this pretrea...

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Published in:	Corrosion Science
ISSN:	0010-938X 1879-0496
Published:	Elsevier BV 2020
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa53821

first_indexed	2020-03-16T19:40:16Z
last_indexed	2025-03-05T05:04:05Z
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spelling	2025-03-04T15:21:45.9992114 v2 53821 2020-03-16 The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel eff2b951eb21917b4b734c665b2cbd8c 0000-0002-5844-7716 Ronald N. Clark Ronald N. Clark true true 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 2020-03-16 Niobium-stabilised austenitic stainless steel (20Cr-25Ni-Nb) has been immersed in sodium hydroxide, which is used as a corrosion inhibitor. The work shows how NbC precipitates may be degraded by use of pH 13 NaOH. Initial electrochemical measurements indicate that there is no benefit to this pretreatment as regards long-term corrosion inhibition, and post corrosion imaging shows the initiation of pitting corrosion at Nb-rich precipitates still present in the microstructure. Journal Article Corrosion Science 170 108596 Elsevier BV 0010-938X 1879-0496 A Stainless steel; B AFM; B EIS; B Polarisation; B SEM; SIMS; C Alkaline corrosion; C Intergranular corrosion; C Pitting corrosion; C Inclusion 1 7 2020 2020-07-01 10.1016/j.corsci.2020.108596 COLLEGE NANME Engineering COLLEGE CODE Swansea University Not Required The authors wish to thank the Nuclear Decommissioning Authority for providing PhD funding for Ronald Clark and May Chan. Support from Westinghouse, UK for providing the sample material is acknowledged. The authors gratefully acknowledge the financial support of the Engineering and Physical Sciences Research Council (EPSRC), UK through the Centre for Doctoral Training in Advanced Metallic Systems. Financial support is also acknowledged from EPSRC, UK and the European Social Fund, UK through the Materials and Manufacturing Academy Centre for Doctoral Training. Support with preparing pretreatment experiments is also acknowledged from Jordan Knapp of NNL. 2025-03-04T15:21:45.9992114 2020-03-16T15:18:30.7014111 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Ronald N. Clark 0000-0002-5844-7716 1 Choen May Chan 2 Tomas L. Martin 3 W.S. Walters 4 Dirk Engelberg 5 Robert Burrows 6 Geraint Williams 0000-0002-3399-5142 7 53821__16852__a704a326bb134eafb8b60c351c07773f.pdf 53821.pdf 2020-03-16T15:20:01.1346231 Output 259856 application/pdf Accepted Manuscript true 2021-03-16T00:00:00.0000000 Released under the terms of a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND). true eng
title	The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel
spellingShingle	The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel Ronald N. Clark Geraint Williams
title_short	The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel
title_full	The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel
title_fullStr	The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel
title_full_unstemmed	The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel
title_sort	The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel
author_id_str_mv	eff2b951eb21917b4b734c665b2cbd8c 0d8fc8d44e2a3c88ce61832f66f20d82
author_id_fullname_str_mv	eff2b951eb21917b4b734c665b2cbd8c_*_Ronald N. Clark 0d8fc8d44e2a3c88ce61832f66f20d82_*_Geraint Williams
author	Ronald N. Clark Geraint Williams
author2	Ronald N. Clark Choen May Chan Tomas L. Martin W.S. Walters Dirk Engelberg Robert Burrows Geraint Williams
format	Journal article
container_title	Corrosion Science
container_volume	170
container_start_page	108596
publishDate	2020
institution	Swansea University
issn	0010-938X 1879-0496
doi_str_mv	10.1016/j.corsci.2020.108596
publisher	Elsevier BV
college_str	Faculty of Science and Engineering
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description	Niobium-stabilised austenitic stainless steel (20Cr-25Ni-Nb) has been immersed in sodium hydroxide, which is used as a corrosion inhibitor. The work shows how NbC precipitates may be degraded by use of pH 13 NaOH. Initial electrochemical measurements indicate that there is no benefit to this pretreatment as regards long-term corrosion inhibition, and post corrosion imaging shows the initiation of pitting corrosion at Nb-rich precipitates still present in the microstructure.
published_date	2020-07-01T05:07:47Z
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The effect of sodium hydroxide on niobium carbide precipitates in thermally sensitised 20Cr-25Ni-Nb austenitic stainless steel

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