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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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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...
| Published in: | Corrosion Science |
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| ISSN: | 0010-938X 1879-0496 |
| Published: |
Elsevier BV
2020
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa53821 |
| 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 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. |
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| Keywords: |
A Stainless steel; B AFM; B EIS; B Polarisation; B SEM; SIMS; C Alkaline corrosion; C Intergranular corrosion; C Pitting corrosion; C Inclusion |
| College: |
Faculty of Science and Engineering |
| Funders: |
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. |
| Start Page: |
108596 |